[8118303] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // kernel.c -- |
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| 8 | // |
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| 9 | // Author : Thierry Delisle |
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[75f3522] | 10 | // Created On : Tue Jan 17 12:27:26 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[ada0246d] | 12 | // Last Modified On : Tue May 26 22:05:19 2020 |
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| 13 | // Update Count : 59 |
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[8118303] | 14 | // |
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| 15 | |
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[2026bb6] | 16 | #define __cforall_thread__ |
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[4069faad] | 17 | // #define __CFA_DEBUG_PRINT_RUNTIME_CORE__ |
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[2026bb6] | 18 | |
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[8118303] | 19 | //C Includes |
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[c84e80a] | 20 | #include <stddef.h> |
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[214e8da] | 21 | #include <errno.h> |
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[ea8b2f7] | 22 | #include <string.h> |
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[9d944b2] | 23 | #include <stdio.h> |
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[8fcbb4c] | 24 | #include <fenv.h> |
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[58b6d1b] | 25 | #include <signal.h> |
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[9d944b2] | 26 | #include <unistd.h> |
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[27f5f71] | 27 | #include <limits.h> // PTHREAD_STACK_MIN |
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[1a3040c] | 28 | #include <sys/mman.h> // mprotect |
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[ada0246d] | 29 | extern "C" { |
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| 30 | #include <sys/resource.h> |
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[eb2e723] | 31 | } |
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[8118303] | 32 | |
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| 33 | //CFA Includes |
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[58b6d1b] | 34 | #include "time.hfa" |
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[73abe95] | 35 | #include "kernel_private.hfa" |
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| 36 | #include "preemption.hfa" |
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| 37 | #include "startup.hfa" |
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[8118303] | 38 | |
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| 39 | //Private includes |
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| 40 | #define __CFA_INVOKE_PRIVATE__ |
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| 41 | #include "invoke.h" |
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| 42 | |
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[4069faad] | 43 | |
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[deca0f5] | 44 | //----------------------------------------------------------------------------- |
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| 45 | // Some assembly required |
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[1805b1b] | 46 | #if defined( __i386 ) |
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[deca0f5] | 47 | #define CtxGet( ctx ) \ |
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| 48 | __asm__ volatile ( \ |
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| 49 | "movl %%esp,%0\n"\ |
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| 50 | "movl %%ebp,%1\n"\ |
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| 51 | : "=rm" (ctx.SP),\ |
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| 52 | "=rm" (ctx.FP) \ |
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| 53 | ) |
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| 54 | |
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| 55 | // mxcr : SSE Status and Control bits (control bits are preserved across function calls) |
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| 56 | // fcw : X87 FPU control word (preserved across function calls) |
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| 57 | #define __x87_store \ |
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| 58 | uint32_t __mxcr; \ |
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| 59 | uint16_t __fcw; \ |
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| 60 | __asm__ volatile ( \ |
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| 61 | "stmxcsr %0\n" \ |
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| 62 | "fnstcw %1\n" \ |
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| 63 | : "=m" (__mxcr),\ |
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| 64 | "=m" (__fcw) \ |
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| 65 | ) |
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| 66 | |
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| 67 | #define __x87_load \ |
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| 68 | __asm__ volatile ( \ |
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| 69 | "fldcw %1\n" \ |
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| 70 | "ldmxcsr %0\n" \ |
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| 71 | ::"m" (__mxcr),\ |
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| 72 | "m" (__fcw) \ |
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| 73 | ) |
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| 74 | |
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| 75 | #elif defined( __x86_64 ) |
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| 76 | #define CtxGet( ctx ) \ |
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| 77 | __asm__ volatile ( \ |
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| 78 | "movq %%rsp,%0\n"\ |
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| 79 | "movq %%rbp,%1\n"\ |
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| 80 | : "=rm" (ctx.SP),\ |
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| 81 | "=rm" (ctx.FP) \ |
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| 82 | ) |
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| 83 | |
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| 84 | #define __x87_store \ |
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| 85 | uint32_t __mxcr; \ |
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| 86 | uint16_t __fcw; \ |
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| 87 | __asm__ volatile ( \ |
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| 88 | "stmxcsr %0\n" \ |
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| 89 | "fnstcw %1\n" \ |
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| 90 | : "=m" (__mxcr),\ |
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| 91 | "=m" (__fcw) \ |
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| 92 | ) |
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| 93 | |
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| 94 | #define __x87_load \ |
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| 95 | __asm__ volatile ( \ |
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| 96 | "fldcw %1\n" \ |
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| 97 | "ldmxcsr %0\n" \ |
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| 98 | :: "m" (__mxcr),\ |
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| 99 | "m" (__fcw) \ |
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| 100 | ) |
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| 101 | |
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| 102 | |
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| 103 | #elif defined( __ARM_ARCH ) |
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| 104 | #define CtxGet( ctx ) __asm__ ( \ |
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| 105 | "mov %0,%%sp\n" \ |
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| 106 | "mov %1,%%r11\n" \ |
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| 107 | : "=rm" (ctx.SP), "=rm" (ctx.FP) ) |
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| 108 | #else |
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| 109 | #error unknown hardware architecture |
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| 110 | #endif |
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| 111 | |
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| 112 | //----------------------------------------------------------------------------- |
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[2ac095d] | 113 | //Start and stop routine for the kernel, declared first to make sure they run first |
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[8c50aed] | 114 | static void __kernel_startup (void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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| 115 | static void __kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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[2ac095d] | 116 | |
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[92e7631] | 117 | //----------------------------------------------------------------------------- |
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| 118 | // Kernel Scheduling logic |
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| 119 | static $thread * __next_thread(cluster * this); |
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| 120 | static void __run_thread(processor * this, $thread * dst); |
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| 121 | static $thread * __halt(processor * this); |
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[504a7dc] | 122 | static bool __wake_one(cluster * cltr); |
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[92e7631] | 123 | static bool __wake_proc(processor *); |
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[2ac095d] | 124 | |
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[8def349] | 125 | //----------------------------------------------------------------------------- |
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| 126 | // Kernel storage |
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[b388ee81] | 127 | KERNEL_STORAGE(cluster, mainCluster); |
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| 128 | KERNEL_STORAGE(processor, mainProcessor); |
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| 129 | KERNEL_STORAGE($thread, mainThread); |
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| 130 | KERNEL_STORAGE(__stack_t, mainThreadCtx); |
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| 131 | KERNEL_STORAGE(__scheduler_RWLock_t, __scheduler_lock); |
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[8def349] | 132 | |
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[b388ee81] | 133 | cluster * mainCluster; |
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| 134 | processor * mainProcessor; |
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| 135 | $thread * mainThread; |
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| 136 | __scheduler_RWLock_t * __scheduler_lock; |
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[eb2e723] | 137 | |
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[ea8b2f7] | 138 | extern "C" { |
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[1805b1b] | 139 | struct { __dllist_t(cluster) list; __spinlock_t lock; } __cfa_dbg_global_clusters; |
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[ea8b2f7] | 140 | } |
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[de94a60] | 141 | |
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[b2f6113] | 142 | size_t __page_size = 0; |
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| 143 | |
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[bd98b58] | 144 | //----------------------------------------------------------------------------- |
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| 145 | // Global state |
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[afc2427] | 146 | thread_local struct KernelThreadData kernelTLS __attribute__ ((tls_model ( "initial-exec" ))) = { |
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[1805b1b] | 147 | NULL, // cannot use 0p |
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[b10affd] | 148 | NULL, |
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[21184e3] | 149 | { 1, false, false }, |
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| 150 | 6u //this should be seeded better but due to a bug calling rdtsc doesn't work |
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[b10affd] | 151 | }; |
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[c84e80a] | 152 | |
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| 153 | //----------------------------------------------------------------------------- |
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[de6319f] | 154 | // Struct to steal stack |
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[8def349] | 155 | struct current_stack_info_t { |
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[1805b1b] | 156 | __stack_t * storage; // pointer to stack object |
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| 157 | void * base; // base of stack |
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| 158 | void * limit; // stack grows towards stack limit |
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| 159 | void * context; // address of cfa_context_t |
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[c84e80a] | 160 | }; |
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| 161 | |
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[242a902] | 162 | void ?{}( current_stack_info_t & this ) { |
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[b2f6113] | 163 | __stack_context_t ctx; |
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| 164 | CtxGet( ctx ); |
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| 165 | this.base = ctx.FP; |
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[8def349] | 166 | |
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| 167 | rlimit r; |
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[132fad4] | 168 | getrlimit( RLIMIT_STACK, &r); |
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[69a61d2] | 169 | size_t size = r.rlim_cur; |
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[8def349] | 170 | |
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[69a61d2] | 171 | this.limit = (void *)(((intptr_t)this.base) - size); |
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[9236060] | 172 | this.context = &storage_mainThreadCtx; |
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[8def349] | 173 | } |
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| 174 | |
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[de6319f] | 175 | //----------------------------------------------------------------------------- |
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| 176 | // Main thread construction |
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[8def349] | 177 | |
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[ac2b598] | 178 | void ?{}( $coroutine & this, current_stack_info_t * info) with( this ) { |
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[b2f6113] | 179 | stack.storage = info->storage; |
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| 180 | with(*stack.storage) { |
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| 181 | limit = info->limit; |
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| 182 | base = info->base; |
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| 183 | } |
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[ffe2fad] | 184 | __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage; |
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| 185 | *istorage |= 0x1; |
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[65deb18] | 186 | name = "Main Thread"; |
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| 187 | state = Start; |
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[1805b1b] | 188 | starter = 0p; |
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| 189 | last = 0p; |
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| 190 | cancellation = 0p; |
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[8def349] | 191 | } |
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| 192 | |
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[ac2b598] | 193 | void ?{}( $thread & this, current_stack_info_t * info) with( this ) { |
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[ff79d5e] | 194 | ticket = 1; |
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[e8e457e] | 195 | state = Start; |
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[65deb18] | 196 | self_cor{ info }; |
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[82c948c] | 197 | curr_cor = &self_cor; |
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[de6319f] | 198 | curr_cluster = mainCluster; |
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[82c948c] | 199 | self_mon.owner = &this; |
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| 200 | self_mon.recursion = 1; |
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| 201 | self_mon_p = &self_mon; |
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[b798713] | 202 | link.next = 0p; |
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| 203 | link.prev = 0p; |
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[de94a60] | 204 | |
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[1805b1b] | 205 | node.next = 0p; |
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| 206 | node.prev = 0p; |
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[a1a17a74] | 207 | doregister(curr_cluster, this); |
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[82c948c] | 208 | |
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| 209 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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[8def349] | 210 | } |
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[c84e80a] | 211 | |
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[8def349] | 212 | //----------------------------------------------------------------------------- |
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| 213 | // Processor coroutine |
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[de6319f] | 214 | void ?{}(processorCtx_t & this) { |
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[39fea2f] | 215 | |
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[8def349] | 216 | } |
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| 217 | |
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[39fea2f] | 218 | // Construct the processor context of non-main processors |
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[c29c342] | 219 | static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
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[242a902] | 220 | (this.__cor){ info }; |
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| 221 | this.proc = proc; |
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[8def349] | 222 | } |
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| 223 | |
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[c7a900a] | 224 | static void * __invoke_processor(void * arg); |
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[8c50aed] | 225 | |
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[e3fea42] | 226 | void ?{}(processor & this, const char name[], cluster & cltr) with( this ) { |
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[de6319f] | 227 | this.name = name; |
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| 228 | this.cltr = &cltr; |
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[7768b8d] | 229 | id = -1u; |
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[c40e7c5] | 230 | terminated{ 0 }; |
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[b0c7419] | 231 | destroyer = 0p; |
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[c40e7c5] | 232 | do_terminate = false; |
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[1805b1b] | 233 | preemption_alarm = 0p; |
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[c40e7c5] | 234 | pending_preemption = false; |
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[094476d] | 235 | runner.proc = &this; |
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[8def349] | 236 | |
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[92e7631] | 237 | idle{}; |
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[6b4cdd3] | 238 | |
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[4069faad] | 239 | __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this); |
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[8c50aed] | 240 | |
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[c7a900a] | 241 | this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this ); |
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[8c50aed] | 242 | |
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[4069faad] | 243 | __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this); |
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[c84e80a] | 244 | } |
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| 245 | |
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[65deb18] | 246 | void ^?{}(processor & this) with( this ){ |
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[ea8b2f7] | 247 | if( ! __atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ) { |
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[4069faad] | 248 | __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this); |
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[85b1deb] | 249 | |
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| 250 | __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED); |
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[92e7631] | 251 | __wake_proc( &this ); |
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[85b1deb] | 252 | |
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[65deb18] | 253 | P( terminated ); |
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[14a61b5] | 254 | verify( kernelTLS.this_processor != &this); |
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[8def349] | 255 | } |
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[6b4cdd3] | 256 | |
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[c66f6cb] | 257 | int err = pthread_join( kernel_thread, 0p ); |
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| 258 | if( err != 0 ) abort("KERNEL ERROR: joining processor %p caused error %s\n", &this, strerror(err)); |
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| 259 | |
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[27f5f71] | 260 | free( this.stack ); |
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[8def349] | 261 | } |
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| 262 | |
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[dd4e2d7] | 263 | void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned io_flags) with( this ) { |
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[de6319f] | 264 | this.name = name; |
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| 265 | this.preemption_rate = preemption_rate; |
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[65deb18] | 266 | ready_queue{}; |
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[de94a60] | 267 | |
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[038be32] | 268 | #if !defined(__CFA_NO_STATISTICS__) |
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| 269 | print_stats = false; |
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| 270 | #endif |
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| 271 | |
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[de94a60] | 272 | procs{ __get }; |
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| 273 | idles{ __get }; |
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[a1a17a74] | 274 | threads{ __get }; |
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[de94a60] | 275 | |
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[b6f2b21] | 276 | __kernel_io_startup( this, io_flags, &this == mainCluster ); |
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[92976d9] | 277 | |
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[de94a60] | 278 | doregister(this); |
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[8def349] | 279 | } |
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| 280 | |
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[242a902] | 281 | void ^?{}(cluster & this) { |
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[f6660520] | 282 | __kernel_io_shutdown( this, &this == mainCluster ); |
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[92976d9] | 283 | |
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[de94a60] | 284 | unregister(this); |
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[c84e80a] | 285 | } |
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| 286 | |
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[75f3522] | 287 | //============================================================================================= |
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| 288 | // Kernel Scheduling logic |
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| 289 | //============================================================================================= |
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[8fcbb4c] | 290 | //Main of the processor contexts |
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[83a071f9] | 291 | void main(processorCtx_t & runner) { |
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[21184e3] | 292 | // Because of a bug, we couldn't initialized the seed on construction |
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| 293 | // Do it here |
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[7768b8d] | 294 | kernelTLS.rand_seed ^= rdtscl(); |
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[21184e3] | 295 | |
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[83a071f9] | 296 | processor * this = runner.proc; |
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[094476d] | 297 | verify(this); |
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[c81ebf9] | 298 | |
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[4069faad] | 299 | __cfadbg_print_safe(runtime_core, "Kernel : core %p starting\n", this); |
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[8118303] | 300 | |
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[7768b8d] | 301 | // register the processor unless it's the main thread which is handled in the boot sequence |
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[b798713] | 302 | if(this != mainProcessor) { |
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[9b1dcc2] | 303 | this->id = doregister((__processor_id_t*)this); |
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[b798713] | 304 | ready_queue_grow( this->cltr ); |
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| 305 | } |
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| 306 | |
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[504a7dc] | 307 | doregister(this->cltr, this); |
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[de94a60] | 308 | |
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[75f3522] | 309 | { |
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[c81ebf9] | 310 | // Setup preemption data |
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| 311 | preemption_scope scope = { this }; |
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| 312 | |
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[4069faad] | 313 | __cfadbg_print_safe(runtime_core, "Kernel : core %p started\n", this); |
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[8118303] | 314 | |
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[ac2b598] | 315 | $thread * readyThread = 0p; |
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[1a3040c] | 316 | for( unsigned int spin_count = 0; ! __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST); spin_count++ ) { |
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[92e7631] | 317 | // Try to get the next thread |
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[8c50aed] | 318 | readyThread = __next_thread( this->cltr ); |
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[75f3522] | 319 | |
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[92e7631] | 320 | // If no ready thread |
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| 321 | if( readyThread == 0p ) { |
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| 322 | // Block until a thread is ready |
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| 323 | readyThread = __halt(this); |
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| 324 | } |
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[75f3522] | 325 | |
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[92e7631] | 326 | // Check if we actually found a thread |
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| 327 | if( readyThread ) { |
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[3381ed7] | 328 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
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[92e7631] | 329 | /* paranoid */ verifyf( readyThread->state == Ready || readyThread->preempted != __NO_PREEMPTION, "state : %d, preempted %d\n", readyThread->state, readyThread->preempted); |
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[504a7dc] | 330 | /* paranoid */ verifyf( readyThread->link.next == 0p, "Expected null got %p", readyThread->link.next ); |
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[4e6fb8e] | 331 | |
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[92e7631] | 332 | // We found a thread run it |
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[8c50aed] | 333 | __run_thread(this, readyThread); |
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[c81ebf9] | 334 | |
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[3381ed7] | 335 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
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[c81ebf9] | 336 | } |
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| 337 | } |
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| 338 | |
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[4069faad] | 339 | __cfadbg_print_safe(runtime_core, "Kernel : core %p stopping\n", this); |
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[c84e80a] | 340 | } |
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[8118303] | 341 | |
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[504a7dc] | 342 | unregister(this->cltr, this); |
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| 343 | |
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[4cedd9f] | 344 | V( this->terminated ); |
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[bdeba0b] | 345 | |
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[7768b8d] | 346 | // unregister the processor unless it's the main thread which is handled in the boot sequence |
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[b798713] | 347 | if(this != mainProcessor) { |
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| 348 | ready_queue_shrink( this->cltr ); |
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[9b1dcc2] | 349 | unregister((__processor_id_t*)this); |
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[b798713] | 350 | } |
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[6a490b2] | 351 | else { |
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| 352 | // HACK : the coroutine context switch expects this_thread to be set |
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| 353 | // and it make sense for it to be set in all other cases except here |
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| 354 | // fake it |
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| 355 | kernelTLS.this_thread = mainThread; |
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| 356 | } |
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[7768b8d] | 357 | |
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[4069faad] | 358 | __cfadbg_print_safe(runtime_core, "Kernel : core %p terminated\n", this); |
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[b798713] | 359 | |
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| 360 | stats_tls_tally(this->cltr); |
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[c84e80a] | 361 | } |
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| 362 | |
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[5c1a531] | 363 | static int * __volatile_errno() __attribute__((noinline)); |
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| 364 | static int * __volatile_errno() { asm(""); return &errno; } |
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| 365 | |
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[14a61b5] | 366 | // KERNEL ONLY |
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[1c273d0] | 367 | // runThread runs a thread by context switching |
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| 368 | // from the processor coroutine to the target thread |
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[ac2b598] | 369 | static void __run_thread(processor * this, $thread * thrd_dst) { |
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| 370 | $coroutine * proc_cor = get_coroutine(this->runner); |
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[8fcbb4c] | 371 | |
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[14a61b5] | 372 | // Update global state |
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[e8e457e] | 373 | kernelTLS.this_thread = thrd_dst; |
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| 374 | |
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[9f575ea] | 375 | // set state of processor coroutine to inactive |
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| 376 | verify(proc_cor->state == Active); |
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[ae7be7a] | 377 | proc_cor->state = Blocked; |
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[e8e457e] | 378 | |
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[9f575ea] | 379 | // Actually run the thread |
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[3381ed7] | 380 | RUNNING: while(true) { |
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[ff79d5e] | 381 | thrd_dst->preempted = __NO_PREEMPTION; |
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| 382 | thrd_dst->state = Active; |
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[e8e457e] | 383 | |
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[ae66348] | 384 | __cfaabi_dbg_debug_do( |
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[276ae57e] | 385 | thrd_dst->park_stale = true; |
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| 386 | thrd_dst->unpark_stale = true; |
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[ae66348] | 387 | ) |
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[75f3522] | 388 | |
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[3381ed7] | 389 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
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[a7b486b] | 390 | /* paranoid */ verify( kernelTLS.this_thread == thrd_dst ); |
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[210b8b3] | 391 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->curr_cor == proc_cor, "ERROR : Destination $thread %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); // add escape condition if we are setting up the processor |
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| 392 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->curr_cor == proc_cor, "ERROR : Destination $thread %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); // add escape condition if we are setting up the processor |
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[3381ed7] | 393 | |
---|
[9f575ea] | 394 | // set context switch to the thread that the processor is executing |
---|
| 395 | verify( thrd_dst->context.SP ); |
---|
[c7a900a] | 396 | __cfactx_switch( &proc_cor->context, &thrd_dst->context ); |
---|
| 397 | // when __cfactx_switch returns we are back in the processor coroutine |
---|
[9f575ea] | 398 | |
---|
[210b8b3] | 399 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); |
---|
| 400 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); |
---|
[a7b486b] | 401 | /* paranoid */ verify( kernelTLS.this_thread == thrd_dst ); |
---|
[3381ed7] | 402 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[75f3522] | 403 | |
---|
[3381ed7] | 404 | |
---|
| 405 | // We just finished running a thread, there are a few things that could have happened. |
---|
| 406 | // 1 - Regular case : the thread has blocked and now one has scheduled it yet. |
---|
| 407 | // 2 - Racy case : the thread has blocked but someone has already tried to schedule it. |
---|
| 408 | // 4 - Preempted |
---|
| 409 | // In case 1, we may have won a race so we can't write to the state again. |
---|
| 410 | // In case 2, we lost the race so we now own the thread. |
---|
| 411 | |
---|
| 412 | if(unlikely(thrd_dst->preempted != __NO_PREEMPTION)) { |
---|
| 413 | // The thread was preempted, reschedule it and reset the flag |
---|
[9b1dcc2] | 414 | __schedule_thread( (__processor_id_t*)this, thrd_dst ); |
---|
[3381ed7] | 415 | break RUNNING; |
---|
| 416 | } |
---|
[75f3522] | 417 | |
---|
[ff79d5e] | 418 | if(unlikely(thrd_dst->state == Halted)) { |
---|
| 419 | // The thread has halted, it should never be scheduled/run again |
---|
| 420 | // We may need to wake someone up here since |
---|
| 421 | unpark( this->destroyer __cfaabi_dbg_ctx2 ); |
---|
| 422 | this->destroyer = 0p; |
---|
| 423 | break RUNNING; |
---|
| 424 | } |
---|
| 425 | |
---|
| 426 | /* paranoid */ verify( thrd_dst->state == Active ); |
---|
| 427 | thrd_dst->state = Blocked; |
---|
| 428 | |
---|
[3381ed7] | 429 | // set state of processor coroutine to active and the thread to inactive |
---|
[ff79d5e] | 430 | int old_ticket = __atomic_fetch_sub(&thrd_dst->ticket, 1, __ATOMIC_SEQ_CST); |
---|
| 431 | __cfaabi_dbg_debug_do( thrd_dst->park_result = old_ticket; ) |
---|
| 432 | switch(old_ticket) { |
---|
| 433 | case 1: |
---|
[3381ed7] | 434 | // This is case 1, the regular case, nothing more is needed |
---|
| 435 | break RUNNING; |
---|
[ff79d5e] | 436 | case 2: |
---|
[3381ed7] | 437 | // This is case 2, the racy case, someone tried to run this thread before it finished blocking |
---|
| 438 | // In this case, just run it again. |
---|
| 439 | continue RUNNING; |
---|
| 440 | default: |
---|
| 441 | // This makes no sense, something is wrong abort |
---|
[ff79d5e] | 442 | abort(); |
---|
[3381ed7] | 443 | } |
---|
[9f575ea] | 444 | } |
---|
[e8e457e] | 445 | |
---|
[9f575ea] | 446 | // Just before returning to the processor, set the processor coroutine to active |
---|
[e8e457e] | 447 | proc_cor->state = Active; |
---|
[ae7be7a] | 448 | kernelTLS.this_thread = 0p; |
---|
[82c948c] | 449 | } |
---|
| 450 | |
---|
[14a61b5] | 451 | // KERNEL_ONLY |
---|
[b0c7419] | 452 | void returnToKernel() { |
---|
[3381ed7] | 453 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[ac2b598] | 454 | $coroutine * proc_cor = get_coroutine(kernelTLS.this_processor->runner); |
---|
| 455 | $thread * thrd_src = kernelTLS.this_thread; |
---|
[e8e457e] | 456 | |
---|
[9f575ea] | 457 | // Run the thread on this processor |
---|
| 458 | { |
---|
| 459 | int local_errno = *__volatile_errno(); |
---|
| 460 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 461 | __x87_store; |
---|
| 462 | #endif |
---|
| 463 | verify( proc_cor->context.SP ); |
---|
[c7a900a] | 464 | __cfactx_switch( &thrd_src->context, &proc_cor->context ); |
---|
[9f575ea] | 465 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 466 | __x87_load; |
---|
| 467 | #endif |
---|
| 468 | *__volatile_errno() = local_errno; |
---|
[8fcbb4c] | 469 | } |
---|
[deca0f5] | 470 | |
---|
[3381ed7] | 471 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[210b8b3] | 472 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) < ((uintptr_t)__get_stack(thrd_src->curr_cor)->base ), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too small.\n", thrd_src ); |
---|
| 473 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) > ((uintptr_t)__get_stack(thrd_src->curr_cor)->limit), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too large.\n", thrd_src ); |
---|
[c84e80a] | 474 | } |
---|
| 475 | |
---|
[14a61b5] | 476 | // KERNEL_ONLY |
---|
[0c92c9f] | 477 | // Context invoker for processors |
---|
| 478 | // This is the entry point for processors (kernel threads) |
---|
| 479 | // It effectively constructs a coroutine by stealing the pthread stack |
---|
[c7a900a] | 480 | static void * __invoke_processor(void * arg) { |
---|
[8def349] | 481 | processor * proc = (processor *) arg; |
---|
[14a61b5] | 482 | kernelTLS.this_processor = proc; |
---|
[1805b1b] | 483 | kernelTLS.this_thread = 0p; |
---|
[14a61b5] | 484 | kernelTLS.preemption_state.[enabled, disable_count] = [false, 1]; |
---|
[8def349] | 485 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
---|
| 486 | // which is needed for the 2-step context switch. However, there is no reason |
---|
[1c273d0] | 487 | // to waste the perfectly valid stack create by pthread. |
---|
[8def349] | 488 | current_stack_info_t info; |
---|
[b2f6113] | 489 | __stack_t ctx; |
---|
| 490 | info.storage = &ctx; |
---|
[094476d] | 491 | (proc->runner){ proc, &info }; |
---|
[8def349] | 492 | |
---|
[b2f6113] | 493 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage); |
---|
[8fcbb4c] | 494 | |
---|
[0c92c9f] | 495 | //Set global state |
---|
[1805b1b] | 496 | kernelTLS.this_thread = 0p; |
---|
[8def349] | 497 | |
---|
| 498 | //We now have a proper context from which to schedule threads |
---|
[4069faad] | 499 | __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx); |
---|
[8def349] | 500 | |
---|
[1c273d0] | 501 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
---|
| 502 | // resume it to start it like it normally would, it will just context switch |
---|
| 503 | // back to here. Instead directly call the main since we already are on the |
---|
[8def349] | 504 | // appropriate stack. |
---|
[094476d] | 505 | get_coroutine(proc->runner)->state = Active; |
---|
| 506 | main( proc->runner ); |
---|
| 507 | get_coroutine(proc->runner)->state = Halted; |
---|
[8def349] | 508 | |
---|
[0c92c9f] | 509 | // Main routine of the core returned, the core is now fully terminated |
---|
[4069faad] | 510 | __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner); |
---|
[8def349] | 511 | |
---|
[1805b1b] | 512 | return 0p; |
---|
[c84e80a] | 513 | } |
---|
| 514 | |
---|
[e3fea42] | 515 | static void Abort( int ret, const char func[] ) { |
---|
[1a3040c] | 516 | if ( ret ) { // pthread routines return errno values |
---|
[1805b1b] | 517 | abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) ); |
---|
[27f5f71] | 518 | } // if |
---|
[1805b1b] | 519 | } // Abort |
---|
| 520 | |
---|
[8c50aed] | 521 | void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) { |
---|
[1805b1b] | 522 | pthread_attr_t attr; |
---|
| 523 | |
---|
| 524 | Abort( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute |
---|
| 525 | |
---|
[27f5f71] | 526 | size_t stacksize; |
---|
[09d4b22] | 527 | // default stack size, normally defined by shell limit |
---|
[1a3040c] | 528 | Abort( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" ); |
---|
[27f5f71] | 529 | assert( stacksize >= PTHREAD_STACK_MIN ); |
---|
[1a3040c] | 530 | |
---|
[09d4b22] | 531 | void * stack; |
---|
| 532 | __cfaabi_dbg_debug_do( |
---|
| 533 | stack = memalign( __page_size, stacksize + __page_size ); |
---|
| 534 | // pthread has no mechanism to create the guard page in user supplied stack. |
---|
| 535 | if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) { |
---|
| 536 | abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
| 537 | } // if |
---|
| 538 | ); |
---|
| 539 | __cfaabi_dbg_no_debug_do( |
---|
| 540 | stack = malloc( stacksize ); |
---|
| 541 | ); |
---|
[1a3040c] | 542 | |
---|
[f80f840] | 543 | Abort( pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" ); |
---|
[27f5f71] | 544 | |
---|
[1805b1b] | 545 | Abort( pthread_create( pthread, &attr, start, arg ), "pthread_create" ); |
---|
| 546 | return stack; |
---|
[c84e80a] | 547 | } |
---|
| 548 | |
---|
[14a61b5] | 549 | // KERNEL_ONLY |
---|
[8c50aed] | 550 | static void __kernel_first_resume( processor * this ) { |
---|
[ac2b598] | 551 | $thread * src = mainThread; |
---|
| 552 | $coroutine * dst = get_coroutine(this->runner); |
---|
[b69ea6b] | 553 | |
---|
[14a61b5] | 554 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[b69ea6b] | 555 | |
---|
[09f357ec] | 556 | kernelTLS.this_thread->curr_cor = dst; |
---|
[b2f6113] | 557 | __stack_prepare( &dst->stack, 65000 ); |
---|
[c7a900a] | 558 | __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine); |
---|
[b69ea6b] | 559 | |
---|
[14a61b5] | 560 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[b69ea6b] | 561 | |
---|
[e8e457e] | 562 | dst->last = &src->self_cor; |
---|
| 563 | dst->starter = dst->starter ? dst->starter : &src->self_cor; |
---|
[b69ea6b] | 564 | |
---|
[92e7631] | 565 | // make sure the current state is still correct |
---|
| 566 | /* paranoid */ verify(src->state == Ready); |
---|
[b69ea6b] | 567 | |
---|
| 568 | // context switch to specified coroutine |
---|
[69a61d2] | 569 | verify( dst->context.SP ); |
---|
[c7a900a] | 570 | __cfactx_switch( &src->context, &dst->context ); |
---|
| 571 | // when __cfactx_switch returns we are back in the src coroutine |
---|
[b69ea6b] | 572 | |
---|
[09f357ec] | 573 | mainThread->curr_cor = &mainThread->self_cor; |
---|
| 574 | |
---|
[92e7631] | 575 | // make sure the current state has been update |
---|
| 576 | /* paranoid */ verify(src->state == Active); |
---|
[b69ea6b] | 577 | |
---|
[14a61b5] | 578 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[b69ea6b] | 579 | } |
---|
| 580 | |
---|
[e8e457e] | 581 | // KERNEL_ONLY |
---|
[8c50aed] | 582 | static void __kernel_last_resume( processor * this ) { |
---|
[ac2b598] | 583 | $coroutine * src = &mainThread->self_cor; |
---|
| 584 | $coroutine * dst = get_coroutine(this->runner); |
---|
[e8e457e] | 585 | |
---|
| 586 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 587 | verify( dst->starter == src ); |
---|
| 588 | verify( dst->context.SP ); |
---|
| 589 | |
---|
[f586539] | 590 | // SKULLDUGGERY in debug the processors check that the |
---|
| 591 | // stack is still within the limit of the stack limits after running a thread. |
---|
| 592 | // that check doesn't make sense if we context switch to the processor using the |
---|
| 593 | // coroutine semantics. Since this is a special case, use the current context |
---|
| 594 | // info to populate these fields. |
---|
| 595 | __cfaabi_dbg_debug_do( |
---|
| 596 | __stack_context_t ctx; |
---|
| 597 | CtxGet( ctx ); |
---|
| 598 | mainThread->context.SP = ctx.SP; |
---|
| 599 | mainThread->context.FP = ctx.FP; |
---|
| 600 | ) |
---|
| 601 | |
---|
[e8e457e] | 602 | // context switch to the processor |
---|
[c7a900a] | 603 | __cfactx_switch( &src->context, &dst->context ); |
---|
[e8e457e] | 604 | } |
---|
| 605 | |
---|
[8def349] | 606 | //----------------------------------------------------------------------------- |
---|
| 607 | // Scheduler routines |
---|
[14a61b5] | 608 | // KERNEL ONLY |
---|
[9b1dcc2] | 609 | void __schedule_thread( struct __processor_id_t * id, $thread * thrd ) { |
---|
[6a490b2] | 610 | /* paranoid */ verify( thrd ); |
---|
| 611 | /* paranoid */ verify( thrd->state != Halted ); |
---|
[9f575ea] | 612 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[3381ed7] | 613 | /* paranoid */ #if defined( __CFA_WITH_VERIFY__ ) |
---|
[504a7dc] | 614 | /* paranoid */ if( thrd->state == Blocked || thrd->state == Start ) assertf( thrd->preempted == __NO_PREEMPTION, |
---|
| 615 | "Error inactive thread marked as preempted, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[ff79d5e] | 616 | /* paranoid */ if( thrd->preempted != __NO_PREEMPTION ) assertf(thrd->state == Active, |
---|
[504a7dc] | 617 | "Error preempted thread marked as not currently running, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[3381ed7] | 618 | /* paranoid */ #endif |
---|
[6a490b2] | 619 | /* paranoid */ verifyf( thrd->link.next == 0p, "Expected null got %p", thrd->link.next ); |
---|
[9f575ea] | 620 | |
---|
[ae7be7a] | 621 | if (thrd->preempted == __NO_PREEMPTION) thrd->state = Ready; |
---|
[6b4cdd3] | 622 | |
---|
[9b1dcc2] | 623 | ready_schedule_lock ( id ); |
---|
[504a7dc] | 624 | push( thrd->curr_cluster, thrd ); |
---|
[b798713] | 625 | |
---|
[504a7dc] | 626 | __wake_one(thrd->curr_cluster); |
---|
[9b1dcc2] | 627 | ready_schedule_unlock( id ); |
---|
[1c273d0] | 628 | |
---|
[9f575ea] | 629 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[db6f06a] | 630 | } |
---|
| 631 | |
---|
[14a61b5] | 632 | // KERNEL ONLY |
---|
[ac2b598] | 633 | static $thread * __next_thread(cluster * this) with( *this ) { |
---|
[3381ed7] | 634 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[7768b8d] | 635 | |
---|
[9b1dcc2] | 636 | ready_schedule_lock ( (__processor_id_t*)kernelTLS.this_processor ); |
---|
[6a490b2] | 637 | $thread * head = pop( this ); |
---|
[9b1dcc2] | 638 | ready_schedule_unlock( (__processor_id_t*)kernelTLS.this_processor ); |
---|
[7768b8d] | 639 | |
---|
[3381ed7] | 640 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[db6f06a] | 641 | return head; |
---|
[eb2e723] | 642 | } |
---|
| 643 | |
---|
[2d8f7b0] | 644 | // KERNEL ONLY unpark with out disabling interrupts |
---|
[9b1dcc2] | 645 | void __unpark( struct __processor_id_t * id, $thread * thrd __cfaabi_dbg_ctx_param2 ) { |
---|
[ae66348] | 646 | // record activity |
---|
[d47349b] | 647 | __cfaabi_dbg_debug_do( char * old_caller = thrd->unpark_caller; ) |
---|
[ae66348] | 648 | __cfaabi_dbg_record_thrd( *thrd, false, caller ); |
---|
| 649 | |
---|
[ff79d5e] | 650 | int old_ticket = __atomic_fetch_add(&thrd->ticket, 1, __ATOMIC_SEQ_CST); |
---|
| 651 | __cfaabi_dbg_debug_do( thrd->unpark_result = old_ticket; thrd->unpark_state = thrd->state; ) |
---|
| 652 | switch(old_ticket) { |
---|
| 653 | case 1: |
---|
[3381ed7] | 654 | // Wake won the race, the thread will reschedule/rerun itself |
---|
| 655 | break; |
---|
[ff79d5e] | 656 | case 0: |
---|
[3381ed7] | 657 | /* paranoid */ verify( ! thrd->preempted != __NO_PREEMPTION ); |
---|
[ff79d5e] | 658 | /* paranoid */ verify( thrd->state == Blocked ); |
---|
[0b33412] | 659 | |
---|
[3381ed7] | 660 | // Wake lost the race, |
---|
[9b1dcc2] | 661 | __schedule_thread( id, thrd ); |
---|
[3381ed7] | 662 | break; |
---|
| 663 | default: |
---|
| 664 | // This makes no sense, something is wrong abort |
---|
| 665 | abort(); |
---|
[de6319f] | 666 | } |
---|
[db6f06a] | 667 | } |
---|
| 668 | |
---|
[2d8f7b0] | 669 | void unpark( $thread * thrd __cfaabi_dbg_ctx_param2 ) { |
---|
| 670 | if( !thrd ) return; |
---|
[db6f06a] | 671 | |
---|
[82ff5845] | 672 | disable_interrupts(); |
---|
[9b1dcc2] | 673 | __unpark( (__processor_id_t*)kernelTLS.this_processor, thrd __cfaabi_dbg_ctx_fwd2 ); |
---|
[36982fc] | 674 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[eb2e723] | 675 | } |
---|
| 676 | |
---|
[ae66348] | 677 | void park( __cfaabi_dbg_ctx_param ) { |
---|
[3381ed7] | 678 | /* paranoid */ verify( kernelTLS.preemption_state.enabled ); |
---|
[82ff5845] | 679 | disable_interrupts(); |
---|
[3381ed7] | 680 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 681 | /* paranoid */ verify( kernelTLS.this_thread->preempted == __NO_PREEMPTION ); |
---|
[0b33412] | 682 | |
---|
[ae66348] | 683 | // record activity |
---|
| 684 | __cfaabi_dbg_record_thrd( *kernelTLS.this_thread, true, caller ); |
---|
[0b33412] | 685 | |
---|
[82c948c] | 686 | returnToKernel(); |
---|
[0b33412] | 687 | |
---|
[3381ed7] | 688 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 689 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[3381ed7] | 690 | /* paranoid */ verify( kernelTLS.preemption_state.enabled ); |
---|
[0c78741] | 691 | |
---|
| 692 | } |
---|
[09800e9] | 693 | |
---|
[3381ed7] | 694 | // KERNEL ONLY |
---|
[b0c7419] | 695 | void __leave_thread() { |
---|
[3381ed7] | 696 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[09800e9] | 697 | returnToKernel(); |
---|
[b0c7419] | 698 | abort(); |
---|
[09800e9] | 699 | } |
---|
| 700 | |
---|
[14a61b5] | 701 | // KERNEL ONLY |
---|
[3381ed7] | 702 | bool force_yield( __Preemption_Reason reason ) { |
---|
| 703 | /* paranoid */ verify( kernelTLS.preemption_state.enabled ); |
---|
[09800e9] | 704 | disable_interrupts(); |
---|
[3381ed7] | 705 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[09800e9] | 706 | |
---|
[ac2b598] | 707 | $thread * thrd = kernelTLS.this_thread; |
---|
[ff79d5e] | 708 | /* paranoid */ verify(thrd->state == Active); |
---|
[3381ed7] | 709 | |
---|
| 710 | // SKULLDUGGERY: It is possible that we are preempting this thread just before |
---|
| 711 | // it was going to park itself. If that is the case and it is already using the |
---|
| 712 | // intrusive fields then we can't use them to preempt the thread |
---|
| 713 | // If that is the case, abandon the preemption. |
---|
| 714 | bool preempted = false; |
---|
[504a7dc] | 715 | if(thrd->link.next == 0p) { |
---|
[3381ed7] | 716 | preempted = true; |
---|
| 717 | thrd->preempted = reason; |
---|
| 718 | returnToKernel(); |
---|
[de6319f] | 719 | } |
---|
[f2b12406] | 720 | |
---|
[3381ed7] | 721 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 722 | enable_interrupts_noPoll(); |
---|
| 723 | /* paranoid */ verify( kernelTLS.preemption_state.enabled ); |
---|
[f2b12406] | 724 | |
---|
[3381ed7] | 725 | return preempted; |
---|
[f2b12406] | 726 | } |
---|
| 727 | |
---|
[fa21ac9] | 728 | //============================================================================================= |
---|
| 729 | // Kernel Setup logic |
---|
| 730 | //============================================================================================= |
---|
[eb2e723] | 731 | //----------------------------------------------------------------------------- |
---|
| 732 | // Kernel boot procedures |
---|
[8c50aed] | 733 | static void __kernel_startup(void) { |
---|
[14a61b5] | 734 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[4069faad] | 735 | __cfadbg_print_safe(runtime_core, "Kernel : Starting\n"); |
---|
[eb2e723] | 736 | |
---|
[b2f6113] | 737 | __page_size = sysconf( _SC_PAGESIZE ); |
---|
| 738 | |
---|
[ea8b2f7] | 739 | __cfa_dbg_global_clusters.list{ __get }; |
---|
| 740 | __cfa_dbg_global_clusters.lock{}; |
---|
[de94a60] | 741 | |
---|
[b388ee81] | 742 | // Initialize the global scheduler lock |
---|
| 743 | __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock; |
---|
| 744 | (*__scheduler_lock){}; |
---|
| 745 | |
---|
[de6319f] | 746 | // Initialize the main cluster |
---|
| 747 | mainCluster = (cluster *)&storage_mainCluster; |
---|
| 748 | (*mainCluster){"Main Cluster"}; |
---|
| 749 | |
---|
[4069faad] | 750 | __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n"); |
---|
[de6319f] | 751 | |
---|
[eb2e723] | 752 | // Start by initializing the main thread |
---|
[1c273d0] | 753 | // SKULLDUGGERY: the mainThread steals the process main thread |
---|
[969b3fe] | 754 | // which will then be scheduled by the mainProcessor normally |
---|
[ac2b598] | 755 | mainThread = ($thread *)&storage_mainThread; |
---|
[8fcbb4c] | 756 | current_stack_info_t info; |
---|
[b2f6113] | 757 | info.storage = (__stack_t*)&storage_mainThreadCtx; |
---|
[83a071f9] | 758 | (*mainThread){ &info }; |
---|
[eb2e723] | 759 | |
---|
[4069faad] | 760 | __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n"); |
---|
[fa21ac9] | 761 | |
---|
[bd98b58] | 762 | |
---|
[de6319f] | 763 | |
---|
| 764 | // Construct the processor context of the main processor |
---|
| 765 | void ?{}(processorCtx_t & this, processor * proc) { |
---|
| 766 | (this.__cor){ "Processor" }; |
---|
[1805b1b] | 767 | this.__cor.starter = 0p; |
---|
[de6319f] | 768 | this.proc = proc; |
---|
| 769 | } |
---|
| 770 | |
---|
| 771 | void ?{}(processor & this) with( this ) { |
---|
| 772 | name = "Main Processor"; |
---|
| 773 | cltr = mainCluster; |
---|
| 774 | terminated{ 0 }; |
---|
| 775 | do_terminate = false; |
---|
[1805b1b] | 776 | preemption_alarm = 0p; |
---|
[de6319f] | 777 | pending_preemption = false; |
---|
| 778 | kernel_thread = pthread_self(); |
---|
[7768b8d] | 779 | id = -1u; |
---|
[de6319f] | 780 | |
---|
| 781 | runner{ &this }; |
---|
[4069faad] | 782 | __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner); |
---|
[de6319f] | 783 | } |
---|
[fa21ac9] | 784 | |
---|
[969b3fe] | 785 | // Initialize the main processor and the main processor ctx |
---|
[eb2e723] | 786 | // (the coroutine that contains the processing control flow) |
---|
[969b3fe] | 787 | mainProcessor = (processor *)&storage_mainProcessor; |
---|
[de6319f] | 788 | (*mainProcessor){}; |
---|
[eb2e723] | 789 | |
---|
[9b1dcc2] | 790 | mainProcessor->id = doregister( (__processor_id_t*)mainProcessor); |
---|
[7768b8d] | 791 | |
---|
[dcb42b8] | 792 | //initialize the global state variables |
---|
[14a61b5] | 793 | kernelTLS.this_processor = mainProcessor; |
---|
| 794 | kernelTLS.this_thread = mainThread; |
---|
[eb2e723] | 795 | |
---|
[82ff5845] | 796 | // Enable preemption |
---|
| 797 | kernel_start_preemption(); |
---|
| 798 | |
---|
[969b3fe] | 799 | // Add the main thread to the ready queue |
---|
| 800 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
---|
[9b1dcc2] | 801 | __schedule_thread((__processor_id_t *)mainProcessor, mainThread); |
---|
[969b3fe] | 802 | |
---|
| 803 | // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX |
---|
[c7a900a] | 804 | // context. Hence, the main thread does not begin through __cfactx_invoke_thread, like all other threads. The trick here is that |
---|
[1c273d0] | 805 | // mainThread is on the ready queue when this call is made. |
---|
[8c50aed] | 806 | __kernel_first_resume( kernelTLS.this_processor ); |
---|
[dcb42b8] | 807 | |
---|
| 808 | |
---|
| 809 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
---|
[f6660520] | 810 | |
---|
| 811 | |
---|
| 812 | // Now that the system is up, finish creating systems that need threading |
---|
| 813 | __kernel_io_finish_start( *mainCluster ); |
---|
| 814 | |
---|
| 815 | |
---|
| 816 | __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n"); |
---|
[82ff5845] | 817 | |
---|
[14a61b5] | 818 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 819 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[afd550c] | 820 | verify( TL_GET( preemption_state.enabled ) ); |
---|
[eb2e723] | 821 | } |
---|
| 822 | |
---|
[8c50aed] | 823 | static void __kernel_shutdown(void) { |
---|
[f6660520] | 824 | //Before we start shutting things down, wait for systems that need threading to shutdown |
---|
| 825 | __kernel_io_prepare_stop( *mainCluster ); |
---|
[eb2e723] | 826 | |
---|
[92e7631] | 827 | /* paranoid */ verify( TL_GET( preemption_state.enabled ) ); |
---|
[4e6fb8e] | 828 | disable_interrupts(); |
---|
[92e7631] | 829 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[4e6fb8e] | 830 | |
---|
[f6660520] | 831 | __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n"); |
---|
[4e6fb8e] | 832 | |
---|
[969b3fe] | 833 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
---|
[dcb42b8] | 834 | // When its coroutine terminates, it return control to the mainThread |
---|
| 835 | // which is currently here |
---|
[ea8b2f7] | 836 | __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE); |
---|
[8c50aed] | 837 | __kernel_last_resume( kernelTLS.this_processor ); |
---|
[ea8b2f7] | 838 | mainThread->self_cor.state = Halted; |
---|
[eb2e723] | 839 | |
---|
[dcb42b8] | 840 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
---|
[eb2e723] | 841 | |
---|
[82ff5845] | 842 | // Disable preemption |
---|
| 843 | kernel_stop_preemption(); |
---|
| 844 | |
---|
[9b1dcc2] | 845 | unregister((__processor_id_t*)mainProcessor); |
---|
[7768b8d] | 846 | |
---|
[969b3fe] | 847 | // Destroy the main processor and its context in reverse order of construction |
---|
[dcb42b8] | 848 | // These were manually constructed so we need manually destroy them |
---|
[c66f6cb] | 849 | void ^?{}(processor & this) with( this ){ |
---|
| 850 | /* paranoid */ verify( this.do_terminate == true ); |
---|
[b798713] | 851 | __cfaabi_dbg_print_safe("Kernel : destroyed main processor context %p\n", &runner); |
---|
| 852 | } |
---|
| 853 | |
---|
[7768b8d] | 854 | ^(*mainProcessor){}; |
---|
[eb2e723] | 855 | |
---|
[dcb42b8] | 856 | // Final step, destroy the main thread since it is no longer needed |
---|
[6a490b2] | 857 | |
---|
[dcb42b8] | 858 | // Since we provided a stack to this taxk it will not destroy anything |
---|
[210b8b3] | 859 | /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1)); |
---|
[7768b8d] | 860 | ^(*mainThread){}; |
---|
| 861 | |
---|
| 862 | ^(*mainCluster){}; |
---|
[eb2e723] | 863 | |
---|
[b388ee81] | 864 | ^(*__scheduler_lock){}; |
---|
| 865 | |
---|
[ea8b2f7] | 866 | ^(__cfa_dbg_global_clusters.list){}; |
---|
| 867 | ^(__cfa_dbg_global_clusters.lock){}; |
---|
[a1a17a74] | 868 | |
---|
[4069faad] | 869 | __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n"); |
---|
[9d944b2] | 870 | } |
---|
| 871 | |
---|
[14a61b5] | 872 | //============================================================================================= |
---|
[92e7631] | 873 | // Kernel Idle Sleep |
---|
[14a61b5] | 874 | //============================================================================================= |
---|
[92e7631] | 875 | static $thread * __halt(processor * this) with( *this ) { |
---|
| 876 | if( do_terminate ) return 0p; |
---|
[ea8b2f7] | 877 | |
---|
[92e7631] | 878 | // First, lock the cluster idle |
---|
| 879 | lock( cltr->idle_lock __cfaabi_dbg_ctx2 ); |
---|
[14a61b5] | 880 | |
---|
[92e7631] | 881 | // Check if we can find a thread |
---|
| 882 | if( $thread * found = __next_thread( cltr ) ) { |
---|
| 883 | unlock( cltr->idle_lock ); |
---|
| 884 | return found; |
---|
[6b4cdd3] | 885 | } |
---|
[14a61b5] | 886 | |
---|
[92e7631] | 887 | // Move this processor from the active list to the idle list |
---|
| 888 | move_to_front(cltr->procs, cltr->idles, *this); |
---|
[14a61b5] | 889 | |
---|
[92e7631] | 890 | // Unlock the idle lock so we don't go to sleep with a lock |
---|
| 891 | unlock (cltr->idle_lock); |
---|
[14a61b5] | 892 | |
---|
[92e7631] | 893 | // We are ready to sleep |
---|
[4069faad] | 894 | __cfadbg_print_safe(runtime_core, "Kernel : Processor %p ready to sleep\n", this); |
---|
[92e7631] | 895 | wait( idle ); |
---|
[14a61b5] | 896 | |
---|
[92e7631] | 897 | // We have woken up |
---|
[4069faad] | 898 | __cfadbg_print_safe(runtime_core, "Kernel : Processor %p woke up and ready to run\n", this); |
---|
[14a61b5] | 899 | |
---|
[92e7631] | 900 | // Get ourself off the idle list |
---|
[6b4cdd3] | 901 | with( *cltr ) { |
---|
[92e7631] | 902 | lock (idle_lock __cfaabi_dbg_ctx2); |
---|
| 903 | move_to_front(idles, procs, *this); |
---|
| 904 | unlock(idle_lock); |
---|
[6b4cdd3] | 905 | } |
---|
[14a61b5] | 906 | |
---|
[92e7631] | 907 | // Don't check the ready queue again, we may not be in a position to run a thread |
---|
| 908 | return 0p; |
---|
| 909 | } |
---|
| 910 | |
---|
| 911 | // Wake a thread from the front if there are any |
---|
[504a7dc] | 912 | static bool __wake_one(cluster * this) { |
---|
[92e7631] | 913 | // First, lock the cluster idle |
---|
| 914 | lock( this->idle_lock __cfaabi_dbg_ctx2 ); |
---|
| 915 | |
---|
| 916 | // Check if there is someone to wake up |
---|
| 917 | if( !this->idles.head ) { |
---|
| 918 | // Nope unlock and return false |
---|
| 919 | unlock( this->idle_lock ); |
---|
| 920 | return false; |
---|
| 921 | } |
---|
| 922 | |
---|
| 923 | // Wake them up |
---|
[4069faad] | 924 | __cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this->idles.head); |
---|
[8e16177] | 925 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
[92e7631] | 926 | post( this->idles.head->idle ); |
---|
| 927 | |
---|
| 928 | // Unlock and return true |
---|
| 929 | unlock( this->idle_lock ); |
---|
| 930 | return true; |
---|
| 931 | } |
---|
| 932 | |
---|
| 933 | // Unconditionnaly wake a thread |
---|
| 934 | static bool __wake_proc(processor * this) { |
---|
[4069faad] | 935 | __cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this); |
---|
[8e16177] | 936 | |
---|
| 937 | disable_interrupts(); |
---|
| 938 | /* paranoid */ verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 939 | bool ret = post( this->idle ); |
---|
| 940 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
| 941 | |
---|
| 942 | return ret; |
---|
[6b4cdd3] | 943 | } |
---|
| 944 | |
---|
[dbe9b08] | 945 | //============================================================================================= |
---|
| 946 | // Unexpected Terminating logic |
---|
| 947 | //============================================================================================= |
---|
[ea7d2b0] | 948 | static __spinlock_t kernel_abort_lock; |
---|
[9d944b2] | 949 | static bool kernel_abort_called = false; |
---|
| 950 | |
---|
[afd550c] | 951 | void * kernel_abort(void) __attribute__ ((__nothrow__)) { |
---|
[9d944b2] | 952 | // abort cannot be recursively entered by the same or different processors because all signal handlers return when |
---|
| 953 | // the globalAbort flag is true. |
---|
[36982fc] | 954 | lock( kernel_abort_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 955 | |
---|
| 956 | // first task to abort ? |
---|
[de94a60] | 957 | if ( kernel_abort_called ) { // not first task to abort ? |
---|
[ea7d2b0] | 958 | unlock( kernel_abort_lock ); |
---|
[1c273d0] | 959 | |
---|
[9d944b2] | 960 | sigset_t mask; |
---|
| 961 | sigemptyset( &mask ); |
---|
[de94a60] | 962 | sigaddset( &mask, SIGALRM ); // block SIGALRM signals |
---|
[8a13c47] | 963 | sigaddset( &mask, SIGUSR1 ); // block SIGALRM signals |
---|
| 964 | sigsuspend( &mask ); // block the processor to prevent further damage during abort |
---|
| 965 | _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it |
---|
[de94a60] | 966 | } |
---|
| 967 | else { |
---|
| 968 | kernel_abort_called = true; |
---|
| 969 | unlock( kernel_abort_lock ); |
---|
[9d944b2] | 970 | } |
---|
| 971 | |
---|
[14a61b5] | 972 | return kernelTLS.this_thread; |
---|
[9d944b2] | 973 | } |
---|
| 974 | |
---|
| 975 | void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) { |
---|
[ac2b598] | 976 | $thread * thrd = kernel_data; |
---|
[9d944b2] | 977 | |
---|
[de94a60] | 978 | if(thrd) { |
---|
| 979 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[1c40091] | 980 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 981 | |
---|
[212c2187] | 982 | if ( &thrd->self_cor != thrd->curr_cor ) { |
---|
| 983 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor ); |
---|
[1c40091] | 984 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 985 | } |
---|
| 986 | else { |
---|
[1c40091] | 987 | __cfaabi_bits_write( STDERR_FILENO, ".\n", 2 ); |
---|
[de94a60] | 988 | } |
---|
[1c273d0] | 989 | } |
---|
[9d944b2] | 990 | else { |
---|
[de94a60] | 991 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
[1c40091] | 992 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[9d944b2] | 993 | } |
---|
| 994 | } |
---|
| 995 | |
---|
[2b8bc41] | 996 | int kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
[14a61b5] | 997 | return get_coroutine(kernelTLS.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
[2b8bc41] | 998 | } |
---|
| 999 | |
---|
[de94a60] | 1000 | static __spinlock_t kernel_debug_lock; |
---|
| 1001 | |
---|
[9d944b2] | 1002 | extern "C" { |
---|
[1c40091] | 1003 | void __cfaabi_bits_acquire() { |
---|
[36982fc] | 1004 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 1005 | } |
---|
| 1006 | |
---|
[1c40091] | 1007 | void __cfaabi_bits_release() { |
---|
[ea7d2b0] | 1008 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 1009 | } |
---|
[8118303] | 1010 | } |
---|
| 1011 | |
---|
[fa21ac9] | 1012 | //============================================================================================= |
---|
| 1013 | // Kernel Utilities |
---|
| 1014 | //============================================================================================= |
---|
[bd98b58] | 1015 | //----------------------------------------------------------------------------- |
---|
| 1016 | // Locks |
---|
[242a902] | 1017 | void ?{}( semaphore & this, int count = 1 ) { |
---|
| 1018 | (this.lock){}; |
---|
| 1019 | this.count = count; |
---|
| 1020 | (this.waiting){}; |
---|
[db6f06a] | 1021 | } |
---|
[242a902] | 1022 | void ^?{}(semaphore & this) {} |
---|
[db6f06a] | 1023 | |
---|
[71c8b7e] | 1024 | bool P(semaphore & this) with( this ){ |
---|
[65deb18] | 1025 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 1026 | count -= 1; |
---|
| 1027 | if ( count < 0 ) { |
---|
[bdeba0b] | 1028 | // queue current task |
---|
[14a61b5] | 1029 | append( waiting, kernelTLS.this_thread ); |
---|
[bdeba0b] | 1030 | |
---|
| 1031 | // atomically release spin lock and block |
---|
[3381ed7] | 1032 | unlock( lock ); |
---|
[ae66348] | 1033 | park( __cfaabi_dbg_ctx ); |
---|
[71c8b7e] | 1034 | return true; |
---|
[8def349] | 1035 | } |
---|
[4e6fb8e] | 1036 | else { |
---|
[65deb18] | 1037 | unlock( lock ); |
---|
[71c8b7e] | 1038 | return false; |
---|
[4e6fb8e] | 1039 | } |
---|
[bd98b58] | 1040 | } |
---|
| 1041 | |
---|
[f0ce5f4] | 1042 | bool V(semaphore & this) with( this ) { |
---|
[ac2b598] | 1043 | $thread * thrd = 0p; |
---|
[65deb18] | 1044 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 1045 | count += 1; |
---|
| 1046 | if ( count <= 0 ) { |
---|
[bdeba0b] | 1047 | // remove task at head of waiting list |
---|
[65deb18] | 1048 | thrd = pop_head( waiting ); |
---|
[bd98b58] | 1049 | } |
---|
[bdeba0b] | 1050 | |
---|
[65deb18] | 1051 | unlock( lock ); |
---|
[bdeba0b] | 1052 | |
---|
| 1053 | // make new owner |
---|
[ae66348] | 1054 | unpark( thrd __cfaabi_dbg_ctx2 ); |
---|
[f0ce5f4] | 1055 | |
---|
[d384787] | 1056 | return thrd != 0p; |
---|
| 1057 | } |
---|
| 1058 | |
---|
| 1059 | bool V(semaphore & this, unsigned diff) with( this ) { |
---|
| 1060 | $thread * thrd = 0p; |
---|
| 1061 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 1062 | int release = max(-count, (int)diff); |
---|
| 1063 | count += diff; |
---|
| 1064 | for(release) { |
---|
| 1065 | unpark( pop_head( waiting ) __cfaabi_dbg_ctx2 ); |
---|
| 1066 | } |
---|
| 1067 | |
---|
| 1068 | unlock( lock ); |
---|
| 1069 | |
---|
[f0ce5f4] | 1070 | return thrd != 0p; |
---|
[bd98b58] | 1071 | } |
---|
| 1072 | |
---|
[f7d6bb0] | 1073 | //----------------------------------------------------------------------------- |
---|
[de94a60] | 1074 | // Global Queues |
---|
| 1075 | void doregister( cluster & cltr ) { |
---|
[ea8b2f7] | 1076 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
| 1077 | push_front( __cfa_dbg_global_clusters.list, cltr ); |
---|
| 1078 | unlock ( __cfa_dbg_global_clusters.lock ); |
---|
[de94a60] | 1079 | } |
---|
[f7d6bb0] | 1080 | |
---|
[de94a60] | 1081 | void unregister( cluster & cltr ) { |
---|
[ea8b2f7] | 1082 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
| 1083 | remove( __cfa_dbg_global_clusters.list, cltr ); |
---|
| 1084 | unlock( __cfa_dbg_global_clusters.lock ); |
---|
[de94a60] | 1085 | } |
---|
[f7d6bb0] | 1086 | |
---|
[ac2b598] | 1087 | void doregister( cluster * cltr, $thread & thrd ) { |
---|
[a1a17a74] | 1088 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
[d4e68a6] | 1089 | cltr->nthreads += 1; |
---|
[a1a17a74] | 1090 | push_front(cltr->threads, thrd); |
---|
| 1091 | unlock (cltr->thread_list_lock); |
---|
| 1092 | } |
---|
| 1093 | |
---|
[ac2b598] | 1094 | void unregister( cluster * cltr, $thread & thrd ) { |
---|
[a1a17a74] | 1095 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
| 1096 | remove(cltr->threads, thrd ); |
---|
[d4e68a6] | 1097 | cltr->nthreads -= 1; |
---|
[a1a17a74] | 1098 | unlock(cltr->thread_list_lock); |
---|
| 1099 | } |
---|
[9181f1d] | 1100 | |
---|
[504a7dc] | 1101 | void doregister( cluster * cltr, processor * proc ) { |
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| 1102 | lock (cltr->idle_lock __cfaabi_dbg_ctx2); |
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| 1103 | cltr->nprocessors += 1; |
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| 1104 | push_front(cltr->procs, *proc); |
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| 1105 | unlock (cltr->idle_lock); |
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| 1106 | } |
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| 1107 | |
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| 1108 | void unregister( cluster * cltr, processor * proc ) { |
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| 1109 | lock (cltr->idle_lock __cfaabi_dbg_ctx2); |
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| 1110 | remove(cltr->procs, *proc ); |
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| 1111 | cltr->nprocessors -= 1; |
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| 1112 | unlock(cltr->idle_lock); |
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| 1113 | } |
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| 1114 | |
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[de94a60] | 1115 | //----------------------------------------------------------------------------- |
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| 1116 | // Debug |
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| 1117 | __cfaabi_dbg_debug_do( |
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[1997b4e] | 1118 | extern "C" { |
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[ae66348] | 1119 | void __cfaabi_dbg_record_lock(__spinlock_t & this, const char prev_name[]) { |
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[1997b4e] | 1120 | this.prev_name = prev_name; |
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| 1121 | this.prev_thrd = kernelTLS.this_thread; |
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| 1122 | } |
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[ae66348] | 1123 | |
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| 1124 | void __cfaabi_dbg_record_thrd($thread & this, bool park, const char prev_name[]) { |
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| 1125 | if(park) { |
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[f0ce5f4] | 1126 | this.park_caller = prev_name; |
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| 1127 | this.park_stale = false; |
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[ae66348] | 1128 | } |
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| 1129 | else { |
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[f0ce5f4] | 1130 | this.unpark_caller = prev_name; |
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| 1131 | this.unpark_stale = false; |
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[ae66348] | 1132 | } |
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| 1133 | } |
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[9181f1d] | 1134 | } |
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[f7d6bb0] | 1135 | ) |
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[2026bb6] | 1136 | |
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| 1137 | //----------------------------------------------------------------------------- |
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| 1138 | // Debug |
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[8c50aed] | 1139 | bool threading_enabled(void) __attribute__((const)) { |
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[2026bb6] | 1140 | return true; |
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| 1141 | } |
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[8118303] | 1142 | // Local Variables: // |
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| 1143 | // mode: c // |
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| 1144 | // tab-width: 4 // |
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| 1145 | // End: // |
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