[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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[d4e68a6] | 12 | // Last Modified On : Thu Jun 20 17:21:23 2019 |
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| 13 | // Update Count : 25 |
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[8118303] | 14 | // |
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| 15 | |
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| 16 | //C Includes |
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[c84e80a] | 17 | #include <stddef.h> |
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[214e8da] | 18 | #include <errno.h> |
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[ea8b2f7] | 19 | #include <string.h> |
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[eb2e723] | 20 | extern "C" { |
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[9d944b2] | 21 | #include <stdio.h> |
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[8fcbb4c] | 22 | #include <fenv.h> |
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[eb2e723] | 23 | #include <sys/resource.h> |
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[58b6d1b] | 24 | #include <signal.h> |
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[9d944b2] | 25 | #include <unistd.h> |
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[eb2e723] | 26 | } |
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[8118303] | 27 | |
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| 28 | //CFA Includes |
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[58b6d1b] | 29 | #include "time.hfa" |
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[73abe95] | 30 | #include "kernel_private.hfa" |
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| 31 | #include "preemption.hfa" |
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| 32 | #include "startup.hfa" |
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[8118303] | 33 | |
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| 34 | //Private includes |
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| 35 | #define __CFA_INVOKE_PRIVATE__ |
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| 36 | #include "invoke.h" |
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| 37 | |
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[deca0f5] | 38 | //----------------------------------------------------------------------------- |
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| 39 | // Some assembly required |
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| 40 | #if defined( __i386 ) |
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| 41 | #define CtxGet( ctx ) \ |
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| 42 | __asm__ volatile ( \ |
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| 43 | "movl %%esp,%0\n"\ |
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| 44 | "movl %%ebp,%1\n"\ |
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| 45 | : "=rm" (ctx.SP),\ |
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| 46 | "=rm" (ctx.FP) \ |
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| 47 | ) |
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| 48 | |
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| 49 | // mxcr : SSE Status and Control bits (control bits are preserved across function calls) |
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| 50 | // fcw : X87 FPU control word (preserved across function calls) |
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| 51 | #define __x87_store \ |
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| 52 | uint32_t __mxcr; \ |
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| 53 | uint16_t __fcw; \ |
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| 54 | __asm__ volatile ( \ |
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| 55 | "stmxcsr %0\n" \ |
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| 56 | "fnstcw %1\n" \ |
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| 57 | : "=m" (__mxcr),\ |
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| 58 | "=m" (__fcw) \ |
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| 59 | ) |
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| 60 | |
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| 61 | #define __x87_load \ |
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| 62 | __asm__ volatile ( \ |
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| 63 | "fldcw %1\n" \ |
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| 64 | "ldmxcsr %0\n" \ |
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| 65 | ::"m" (__mxcr),\ |
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| 66 | "m" (__fcw) \ |
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| 67 | ) |
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| 68 | |
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| 69 | #elif defined( __x86_64 ) |
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| 70 | #define CtxGet( ctx ) \ |
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| 71 | __asm__ volatile ( \ |
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| 72 | "movq %%rsp,%0\n"\ |
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| 73 | "movq %%rbp,%1\n"\ |
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| 74 | : "=rm" (ctx.SP),\ |
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| 75 | "=rm" (ctx.FP) \ |
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| 76 | ) |
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| 77 | |
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| 78 | #define __x87_store \ |
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| 79 | uint32_t __mxcr; \ |
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| 80 | uint16_t __fcw; \ |
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| 81 | __asm__ volatile ( \ |
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| 82 | "stmxcsr %0\n" \ |
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| 83 | "fnstcw %1\n" \ |
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| 84 | : "=m" (__mxcr),\ |
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| 85 | "=m" (__fcw) \ |
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| 86 | ) |
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| 87 | |
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| 88 | #define __x87_load \ |
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| 89 | __asm__ volatile ( \ |
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| 90 | "fldcw %1\n" \ |
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| 91 | "ldmxcsr %0\n" \ |
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| 92 | :: "m" (__mxcr),\ |
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| 93 | "m" (__fcw) \ |
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| 94 | ) |
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| 95 | |
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| 96 | |
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| 97 | #elif defined( __ARM_ARCH ) |
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| 98 | #define CtxGet( ctx ) __asm__ ( \ |
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| 99 | "mov %0,%%sp\n" \ |
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| 100 | "mov %1,%%r11\n" \ |
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| 101 | : "=rm" (ctx.SP), "=rm" (ctx.FP) ) |
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| 102 | #else |
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| 103 | #error unknown hardware architecture |
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| 104 | #endif |
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| 105 | |
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| 106 | //----------------------------------------------------------------------------- |
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[2ac095d] | 107 | //Start and stop routine for the kernel, declared first to make sure they run first |
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[c29c342] | 108 | static void kernel_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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| 109 | static void kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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[2ac095d] | 110 | |
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[8def349] | 111 | //----------------------------------------------------------------------------- |
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| 112 | // Kernel storage |
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[b2f6113] | 113 | KERNEL_STORAGE(cluster, mainCluster); |
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| 114 | KERNEL_STORAGE(processor, mainProcessor); |
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| 115 | KERNEL_STORAGE(thread_desc, mainThread); |
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| 116 | KERNEL_STORAGE(__stack_t, mainThreadCtx); |
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[8def349] | 117 | |
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[de6319f] | 118 | cluster * mainCluster; |
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| 119 | processor * mainProcessor; |
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[348006f] | 120 | thread_desc * mainThread; |
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[eb2e723] | 121 | |
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[ea8b2f7] | 122 | extern "C" { |
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| 123 | struct { __dllist_t(cluster) list; __spinlock_t lock; } __cfa_dbg_global_clusters; |
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| 124 | } |
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[de94a60] | 125 | |
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[b2f6113] | 126 | size_t __page_size = 0; |
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| 127 | |
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[bd98b58] | 128 | //----------------------------------------------------------------------------- |
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| 129 | // Global state |
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[afc2427] | 130 | thread_local struct KernelThreadData kernelTLS __attribute__ ((tls_model ( "initial-exec" ))) = { |
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[b10affd] | 131 | NULL, |
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| 132 | NULL, |
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| 133 | { 1, false, false } |
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| 134 | }; |
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[c84e80a] | 135 | |
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| 136 | //----------------------------------------------------------------------------- |
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[de6319f] | 137 | // Struct to steal stack |
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[8def349] | 138 | struct current_stack_info_t { |
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[b2f6113] | 139 | __stack_t * storage; // pointer to stack object |
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[8def349] | 140 | void *base; // base of stack |
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| 141 | void *limit; // stack grows towards stack limit |
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| 142 | void *context; // address of cfa_context_t |
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[c84e80a] | 143 | }; |
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| 144 | |
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[242a902] | 145 | void ?{}( current_stack_info_t & this ) { |
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[b2f6113] | 146 | __stack_context_t ctx; |
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| 147 | CtxGet( ctx ); |
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| 148 | this.base = ctx.FP; |
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[8def349] | 149 | |
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| 150 | rlimit r; |
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[132fad4] | 151 | getrlimit( RLIMIT_STACK, &r); |
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[69a61d2] | 152 | size_t size = r.rlim_cur; |
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[8def349] | 153 | |
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[69a61d2] | 154 | this.limit = (void *)(((intptr_t)this.base) - size); |
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[9236060] | 155 | this.context = &storage_mainThreadCtx; |
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[8def349] | 156 | } |
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| 157 | |
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[de6319f] | 158 | //----------------------------------------------------------------------------- |
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| 159 | // Main thread construction |
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[8def349] | 160 | |
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[65deb18] | 161 | void ?{}( coroutine_desc & this, current_stack_info_t * info) with( this ) { |
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[b2f6113] | 162 | stack.storage = info->storage; |
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| 163 | with(*stack.storage) { |
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| 164 | limit = info->limit; |
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| 165 | base = info->base; |
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| 166 | } |
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[ffe2fad] | 167 | __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage; |
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| 168 | *istorage |= 0x1; |
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[65deb18] | 169 | name = "Main Thread"; |
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| 170 | state = Start; |
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| 171 | starter = NULL; |
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[b2f6113] | 172 | last = NULL; |
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| 173 | cancellation = NULL; |
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[8def349] | 174 | } |
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| 175 | |
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[65deb18] | 176 | void ?{}( thread_desc & this, current_stack_info_t * info) with( this ) { |
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[e8e457e] | 177 | state = Start; |
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[65deb18] | 178 | self_cor{ info }; |
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[82c948c] | 179 | curr_cor = &self_cor; |
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[de6319f] | 180 | curr_cluster = mainCluster; |
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[82c948c] | 181 | self_mon.owner = &this; |
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| 182 | self_mon.recursion = 1; |
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| 183 | self_mon_p = &self_mon; |
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| 184 | next = NULL; |
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[de94a60] | 185 | |
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| 186 | node.next = NULL; |
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| 187 | node.prev = NULL; |
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[a1a17a74] | 188 | doregister(curr_cluster, this); |
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[82c948c] | 189 | |
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| 190 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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[8def349] | 191 | } |
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[c84e80a] | 192 | |
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[8def349] | 193 | //----------------------------------------------------------------------------- |
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| 194 | // Processor coroutine |
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[de6319f] | 195 | void ?{}(processorCtx_t & this) { |
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[39fea2f] | 196 | |
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[8def349] | 197 | } |
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| 198 | |
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[39fea2f] | 199 | // Construct the processor context of non-main processors |
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[c29c342] | 200 | static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
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[242a902] | 201 | (this.__cor){ info }; |
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| 202 | this.proc = proc; |
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[8def349] | 203 | } |
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| 204 | |
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[c29c342] | 205 | static void start(processor * this); |
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[de6319f] | 206 | void ?{}(processor & this, const char * name, cluster & cltr) with( this ) { |
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| 207 | this.name = name; |
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| 208 | this.cltr = &cltr; |
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[c40e7c5] | 209 | terminated{ 0 }; |
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| 210 | do_terminate = false; |
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| 211 | preemption_alarm = NULL; |
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| 212 | pending_preemption = false; |
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[094476d] | 213 | runner.proc = &this; |
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[8def349] | 214 | |
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[85b1deb] | 215 | idleLock{}; |
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[6b4cdd3] | 216 | |
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[242a902] | 217 | start( &this ); |
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[c84e80a] | 218 | } |
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| 219 | |
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[65deb18] | 220 | void ^?{}(processor & this) with( this ){ |
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[ea8b2f7] | 221 | if( ! __atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ) { |
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[36982fc] | 222 | __cfaabi_dbg_print_safe("Kernel : core %p signaling termination\n", &this); |
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[85b1deb] | 223 | |
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| 224 | __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED); |
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| 225 | wake( &this ); |
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| 226 | |
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[65deb18] | 227 | P( terminated ); |
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[14a61b5] | 228 | verify( kernelTLS.this_processor != &this); |
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[8def349] | 229 | } |
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[6b4cdd3] | 230 | |
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[85b1deb] | 231 | pthread_join( kernel_thread, NULL ); |
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[8def349] | 232 | } |
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| 233 | |
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[de6319f] | 234 | void ?{}(cluster & this, const char * name, Duration preemption_rate) with( this ) { |
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| 235 | this.name = name; |
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| 236 | this.preemption_rate = preemption_rate; |
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[65deb18] | 237 | ready_queue{}; |
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| 238 | ready_queue_lock{}; |
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[de94a60] | 239 | |
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| 240 | procs{ __get }; |
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| 241 | idles{ __get }; |
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[a1a17a74] | 242 | threads{ __get }; |
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[de94a60] | 243 | |
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| 244 | doregister(this); |
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[8def349] | 245 | } |
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| 246 | |
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[242a902] | 247 | void ^?{}(cluster & this) { |
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[de94a60] | 248 | unregister(this); |
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[c84e80a] | 249 | } |
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| 250 | |
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[75f3522] | 251 | //============================================================================================= |
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| 252 | // Kernel Scheduling logic |
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| 253 | //============================================================================================= |
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[c29c342] | 254 | static void runThread(processor * this, thread_desc * dst); |
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| 255 | static void finishRunning(processor * this); |
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| 256 | static void halt(processor * this); |
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| 257 | |
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[8fcbb4c] | 258 | //Main of the processor contexts |
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[83a071f9] | 259 | void main(processorCtx_t & runner) { |
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| 260 | processor * this = runner.proc; |
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[094476d] | 261 | verify(this); |
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[c81ebf9] | 262 | |
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[36982fc] | 263 | __cfaabi_dbg_print_safe("Kernel : core %p starting\n", this); |
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[8118303] | 264 | |
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[de94a60] | 265 | doregister(this->cltr, this); |
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| 266 | |
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[75f3522] | 267 | { |
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[c81ebf9] | 268 | // Setup preemption data |
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| 269 | preemption_scope scope = { this }; |
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| 270 | |
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[36982fc] | 271 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[8118303] | 272 | |
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[c81ebf9] | 273 | thread_desc * readyThread = NULL; |
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[ea8b2f7] | 274 | for( unsigned int spin_count = 0; ! __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST); spin_count++ ) |
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[75f3522] | 275 | { |
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[c81ebf9] | 276 | readyThread = nextThread( this->cltr ); |
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[75f3522] | 277 | |
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[c81ebf9] | 278 | if(readyThread) |
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| 279 | { |
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[14a61b5] | 280 | verify( ! kernelTLS.preemption_state.enabled ); |
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[4e6fb8e] | 281 | |
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[c81ebf9] | 282 | runThread(this, readyThread); |
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[75f3522] | 283 | |
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[14a61b5] | 284 | verify( ! kernelTLS.preemption_state.enabled ); |
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[4e6fb8e] | 285 | |
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[c81ebf9] | 286 | //Some actions need to be taken from the kernel |
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| 287 | finishRunning(this); |
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| 288 | |
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| 289 | spin_count = 0; |
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| 290 | } |
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| 291 | else |
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| 292 | { |
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[ea8b2f7] | 293 | // spin(this, &spin_count); |
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| 294 | halt(this); |
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[c81ebf9] | 295 | } |
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| 296 | } |
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| 297 | |
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[36982fc] | 298 | __cfaabi_dbg_print_safe("Kernel : core %p stopping\n", this); |
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[c84e80a] | 299 | } |
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[8118303] | 300 | |
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[de94a60] | 301 | unregister(this->cltr, this); |
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| 302 | |
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[4cedd9f] | 303 | V( this->terminated ); |
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[bdeba0b] | 304 | |
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[36982fc] | 305 | __cfaabi_dbg_print_safe("Kernel : core %p terminated\n", this); |
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[c84e80a] | 306 | } |
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| 307 | |
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[5c1a531] | 308 | static int * __volatile_errno() __attribute__((noinline)); |
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| 309 | static int * __volatile_errno() { asm(""); return &errno; } |
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| 310 | |
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[14a61b5] | 311 | // KERNEL ONLY |
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[1c273d0] | 312 | // runThread runs a thread by context switching |
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| 313 | // from the processor coroutine to the target thread |
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[e8e457e] | 314 | static void runThread(processor * this, thread_desc * thrd_dst) { |
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[094476d] | 315 | coroutine_desc * proc_cor = get_coroutine(this->runner); |
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[1c273d0] | 316 | |
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[14a61b5] | 317 | // Reset the terminating actions here |
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[db6f06a] | 318 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 319 | |
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[14a61b5] | 320 | // Update global state |
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[e8e457e] | 321 | kernelTLS.this_thread = thrd_dst; |
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| 322 | |
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| 323 | // set state of processor coroutine to inactive and the thread to active |
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| 324 | proc_cor->state = proc_cor->state == Halted ? Halted : Inactive; |
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| 325 | thrd_dst->state = Active; |
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| 326 | |
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| 327 | // set context switch to the thread that the processor is executing |
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| 328 | verify( thrd_dst->context.SP ); |
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| 329 | CtxSwitch( &proc_cor->context, &thrd_dst->context ); |
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| 330 | // when CtxSwitch returns we are back in the processor coroutine |
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[75f3522] | 331 | |
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[e8e457e] | 332 | // set state of processor coroutine to active and the thread to inactive |
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| 333 | thrd_dst->state = thrd_dst->state == Halted ? Halted : Inactive; |
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| 334 | proc_cor->state = Active; |
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[75f3522] | 335 | } |
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| 336 | |
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[14a61b5] | 337 | // KERNEL_ONLY |
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[c29c342] | 338 | static void returnToKernel() { |
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[14a61b5] | 339 | coroutine_desc * proc_cor = get_coroutine(kernelTLS.this_processor->runner); |
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[e8e457e] | 340 | thread_desc * thrd_src = kernelTLS.this_thread; |
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| 341 | |
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| 342 | // set state of current coroutine to inactive |
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| 343 | thrd_src->state = thrd_src->state == Halted ? Halted : Inactive; |
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| 344 | proc_cor->state = Active; |
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[5c1a531] | 345 | int local_errno = *__volatile_errno(); |
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[deca0f5] | 346 | #if defined( __i386 ) || defined( __x86_64 ) |
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| 347 | __x87_store; |
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| 348 | #endif |
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[e8e457e] | 349 | |
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| 350 | // set new coroutine that the processor is executing |
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| 351 | // and context switch to it |
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| 352 | verify( proc_cor->context.SP ); |
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| 353 | CtxSwitch( &thrd_src->context, &proc_cor->context ); |
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| 354 | |
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| 355 | // set state of new coroutine to active |
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| 356 | proc_cor->state = proc_cor->state == Halted ? Halted : Inactive; |
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| 357 | thrd_src->state = Active; |
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[deca0f5] | 358 | |
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| 359 | #if defined( __i386 ) || defined( __x86_64 ) |
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| 360 | __x87_load; |
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| 361 | #endif |
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[5c1a531] | 362 | *__volatile_errno() = local_errno; |
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[82c948c] | 363 | } |
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| 364 | |
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[14a61b5] | 365 | // KERNEL_ONLY |
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[1c273d0] | 366 | // Once a thread has finished running, some of |
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[75f3522] | 367 | // its final actions must be executed from the kernel |
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[c29c342] | 368 | static void finishRunning(processor * this) with( this->finish ) { |
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[09800e9] | 369 | verify( ! kernelTLS.preemption_state.enabled ); |
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| 370 | choose( action_code ) { |
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| 371 | case No_Action: |
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| 372 | break; |
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| 373 | case Release: |
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[65deb18] | 374 | unlock( *lock ); |
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[09800e9] | 375 | case Schedule: |
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[65deb18] | 376 | ScheduleThread( thrd ); |
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[09800e9] | 377 | case Release_Schedule: |
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[65deb18] | 378 | unlock( *lock ); |
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| 379 | ScheduleThread( thrd ); |
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[09800e9] | 380 | case Release_Multi: |
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[65deb18] | 381 | for(int i = 0; i < lock_count; i++) { |
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| 382 | unlock( *locks[i] ); |
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[0c78741] | 383 | } |
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[09800e9] | 384 | case Release_Multi_Schedule: |
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[65deb18] | 385 | for(int i = 0; i < lock_count; i++) { |
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| 386 | unlock( *locks[i] ); |
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[0c78741] | 387 | } |
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[65deb18] | 388 | for(int i = 0; i < thrd_count; i++) { |
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| 389 | ScheduleThread( thrds[i] ); |
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[0c78741] | 390 | } |
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[09800e9] | 391 | case Callback: |
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| 392 | callback(); |
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| 393 | default: |
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| 394 | abort("KERNEL ERROR: Unexpected action to run after thread"); |
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[8fcbb4c] | 395 | } |
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[c84e80a] | 396 | } |
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| 397 | |
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[14a61b5] | 398 | // KERNEL_ONLY |
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[0c92c9f] | 399 | // Context invoker for processors |
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| 400 | // This is the entry point for processors (kernel threads) |
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| 401 | // It effectively constructs a coroutine by stealing the pthread stack |
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[c29c342] | 402 | static void * CtxInvokeProcessor(void * arg) { |
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[8def349] | 403 | processor * proc = (processor *) arg; |
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[14a61b5] | 404 | kernelTLS.this_processor = proc; |
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| 405 | kernelTLS.this_thread = NULL; |
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| 406 | kernelTLS.preemption_state.[enabled, disable_count] = [false, 1]; |
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[8def349] | 407 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 408 | // which is needed for the 2-step context switch. However, there is no reason |
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[1c273d0] | 409 | // to waste the perfectly valid stack create by pthread. |
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[8def349] | 410 | current_stack_info_t info; |
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[b2f6113] | 411 | __stack_t ctx; |
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| 412 | info.storage = &ctx; |
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[094476d] | 413 | (proc->runner){ proc, &info }; |
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[8def349] | 414 | |
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[b2f6113] | 415 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage); |
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[8fcbb4c] | 416 | |
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[0c92c9f] | 417 | //Set global state |
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[14a61b5] | 418 | kernelTLS.this_thread = NULL; |
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[8def349] | 419 | |
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| 420 | //We now have a proper context from which to schedule threads |
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[094476d] | 421 | __cfaabi_dbg_print_safe("Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx); |
---|
[8def349] | 422 | |
---|
[1c273d0] | 423 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
---|
| 424 | // resume it to start it like it normally would, it will just context switch |
---|
| 425 | // back to here. Instead directly call the main since we already are on the |
---|
[8def349] | 426 | // appropriate stack. |
---|
[094476d] | 427 | get_coroutine(proc->runner)->state = Active; |
---|
| 428 | main( proc->runner ); |
---|
| 429 | get_coroutine(proc->runner)->state = Halted; |
---|
[8def349] | 430 | |
---|
[0c92c9f] | 431 | // Main routine of the core returned, the core is now fully terminated |
---|
[094476d] | 432 | __cfaabi_dbg_print_safe("Kernel : core %p main ended (%p)\n", proc, &proc->runner); |
---|
[8def349] | 433 | |
---|
| 434 | return NULL; |
---|
[c84e80a] | 435 | } |
---|
| 436 | |
---|
[c29c342] | 437 | static void start(processor * this) { |
---|
[36982fc] | 438 | __cfaabi_dbg_print_safe("Kernel : Starting core %p\n", this); |
---|
[82ff5845] | 439 | |
---|
[8fcbb4c] | 440 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
---|
[eb2e723] | 441 | |
---|
[36982fc] | 442 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
---|
[eb2e723] | 443 | } |
---|
| 444 | |
---|
[14a61b5] | 445 | // KERNEL_ONLY |
---|
[e8e457e] | 446 | void kernel_first_resume( processor * this ) { |
---|
| 447 | thread_desc * src = mainThread; |
---|
[094476d] | 448 | coroutine_desc * dst = get_coroutine(this->runner); |
---|
[b69ea6b] | 449 | |
---|
[14a61b5] | 450 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[b69ea6b] | 451 | |
---|
[b2f6113] | 452 | __stack_prepare( &dst->stack, 65000 ); |
---|
[094476d] | 453 | CtxStart(&this->runner, CtxInvokeCoroutine); |
---|
[b69ea6b] | 454 | |
---|
[14a61b5] | 455 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[b69ea6b] | 456 | |
---|
[e8e457e] | 457 | dst->last = &src->self_cor; |
---|
| 458 | dst->starter = dst->starter ? dst->starter : &src->self_cor; |
---|
[b69ea6b] | 459 | |
---|
| 460 | // set state of current coroutine to inactive |
---|
| 461 | src->state = src->state == Halted ? Halted : Inactive; |
---|
| 462 | |
---|
| 463 | // context switch to specified coroutine |
---|
[69a61d2] | 464 | verify( dst->context.SP ); |
---|
[b2f6113] | 465 | CtxSwitch( &src->context, &dst->context ); |
---|
[b69ea6b] | 466 | // when CtxSwitch returns we are back in the src coroutine |
---|
| 467 | |
---|
| 468 | // set state of new coroutine to active |
---|
| 469 | src->state = Active; |
---|
| 470 | |
---|
[14a61b5] | 471 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[b69ea6b] | 472 | } |
---|
| 473 | |
---|
[e8e457e] | 474 | // KERNEL_ONLY |
---|
| 475 | void kernel_last_resume( processor * this ) { |
---|
| 476 | coroutine_desc * src = &mainThread->self_cor; |
---|
| 477 | coroutine_desc * dst = get_coroutine(this->runner); |
---|
| 478 | |
---|
| 479 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 480 | verify( dst->starter == src ); |
---|
| 481 | verify( dst->context.SP ); |
---|
| 482 | |
---|
| 483 | // context switch to the processor |
---|
| 484 | CtxSwitch( &src->context, &dst->context ); |
---|
| 485 | } |
---|
| 486 | |
---|
[8def349] | 487 | //----------------------------------------------------------------------------- |
---|
| 488 | // Scheduler routines |
---|
[14a61b5] | 489 | |
---|
| 490 | // KERNEL ONLY |
---|
[348006f] | 491 | void ScheduleThread( thread_desc * thrd ) { |
---|
[135b431] | 492 | verify( thrd ); |
---|
[e8e457e] | 493 | verify( thrd->state != Halted ); |
---|
[1c273d0] | 494 | |
---|
[14a61b5] | 495 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[690f13c] | 496 | |
---|
[4aa2fb2] | 497 | verifyf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
---|
[1c273d0] | 498 | |
---|
[de6319f] | 499 | with( *thrd->curr_cluster ) { |
---|
[65deb18] | 500 | lock ( ready_queue_lock __cfaabi_dbg_ctx2 ); |
---|
[6b4cdd3] | 501 | bool was_empty = !(ready_queue != 0); |
---|
[65deb18] | 502 | append( ready_queue, thrd ); |
---|
| 503 | unlock( ready_queue_lock ); |
---|
[6b4cdd3] | 504 | |
---|
[85b1deb] | 505 | if(was_empty) { |
---|
[6b4cdd3] | 506 | lock (proc_list_lock __cfaabi_dbg_ctx2); |
---|
| 507 | if(idles) { |
---|
[85b1deb] | 508 | wake_fast(idles.head); |
---|
[6b4cdd3] | 509 | } |
---|
| 510 | unlock (proc_list_lock); |
---|
| 511 | } |
---|
[85b1deb] | 512 | else if( struct processor * idle = idles.head ) { |
---|
| 513 | wake_fast(idle); |
---|
| 514 | } |
---|
| 515 | |
---|
[65deb18] | 516 | } |
---|
[1c273d0] | 517 | |
---|
[14a61b5] | 518 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[db6f06a] | 519 | } |
---|
| 520 | |
---|
[14a61b5] | 521 | // KERNEL ONLY |
---|
[65deb18] | 522 | thread_desc * nextThread(cluster * this) with( *this ) { |
---|
[14a61b5] | 523 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[65deb18] | 524 | lock( ready_queue_lock __cfaabi_dbg_ctx2 ); |
---|
| 525 | thread_desc * head = pop_head( ready_queue ); |
---|
| 526 | unlock( ready_queue_lock ); |
---|
[14a61b5] | 527 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[db6f06a] | 528 | return head; |
---|
[eb2e723] | 529 | } |
---|
| 530 | |
---|
[82ff5845] | 531 | void BlockInternal() { |
---|
| 532 | disable_interrupts(); |
---|
[14a61b5] | 533 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 534 | returnToKernel(); |
---|
[14a61b5] | 535 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 536 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[75f3522] | 537 | } |
---|
| 538 | |
---|
[ea7d2b0] | 539 | void BlockInternal( __spinlock_t * lock ) { |
---|
[82ff5845] | 540 | disable_interrupts(); |
---|
[14a61b5] | 541 | with( *kernelTLS.this_processor ) { |
---|
[de6319f] | 542 | finish.action_code = Release; |
---|
| 543 | finish.lock = lock; |
---|
| 544 | } |
---|
[0b33412] | 545 | |
---|
[afd550c] | 546 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 547 | returnToKernel(); |
---|
[afd550c] | 548 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 549 | |
---|
[36982fc] | 550 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[db6f06a] | 551 | } |
---|
| 552 | |
---|
[82ff5845] | 553 | void BlockInternal( thread_desc * thrd ) { |
---|
| 554 | disable_interrupts(); |
---|
[14a61b5] | 555 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 556 | finish.action_code = Schedule; |
---|
| 557 | finish.thrd = thrd; |
---|
| 558 | } |
---|
[0b33412] | 559 | |
---|
[14a61b5] | 560 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 561 | returnToKernel(); |
---|
[14a61b5] | 562 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 563 | |
---|
[36982fc] | 564 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[db6f06a] | 565 | } |
---|
| 566 | |
---|
[ea7d2b0] | 567 | void BlockInternal( __spinlock_t * lock, thread_desc * thrd ) { |
---|
[97e3296] | 568 | assert(thrd); |
---|
[82ff5845] | 569 | disable_interrupts(); |
---|
[14a61b5] | 570 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 571 | finish.action_code = Release_Schedule; |
---|
| 572 | finish.lock = lock; |
---|
| 573 | finish.thrd = thrd; |
---|
| 574 | } |
---|
[0b33412] | 575 | |
---|
[14a61b5] | 576 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 577 | returnToKernel(); |
---|
[14a61b5] | 578 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 579 | |
---|
[36982fc] | 580 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[eb2e723] | 581 | } |
---|
| 582 | |
---|
[ea7d2b0] | 583 | void BlockInternal(__spinlock_t * locks [], unsigned short count) { |
---|
[82ff5845] | 584 | disable_interrupts(); |
---|
[14a61b5] | 585 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 586 | finish.action_code = Release_Multi; |
---|
| 587 | finish.locks = locks; |
---|
| 588 | finish.lock_count = count; |
---|
| 589 | } |
---|
[0b33412] | 590 | |
---|
[14a61b5] | 591 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 592 | returnToKernel(); |
---|
[14a61b5] | 593 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 594 | |
---|
[36982fc] | 595 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[0c78741] | 596 | } |
---|
| 597 | |
---|
[ea7d2b0] | 598 | void BlockInternal(__spinlock_t * locks [], unsigned short lock_count, thread_desc * thrds [], unsigned short thrd_count) { |
---|
[82ff5845] | 599 | disable_interrupts(); |
---|
[14a61b5] | 600 | with( *kernelTLS.this_processor ) { |
---|
[de6319f] | 601 | finish.action_code = Release_Multi_Schedule; |
---|
| 602 | finish.locks = locks; |
---|
| 603 | finish.lock_count = lock_count; |
---|
| 604 | finish.thrds = thrds; |
---|
| 605 | finish.thrd_count = thrd_count; |
---|
| 606 | } |
---|
[0b33412] | 607 | |
---|
[14a61b5] | 608 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 609 | returnToKernel(); |
---|
[14a61b5] | 610 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 611 | |
---|
[36982fc] | 612 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[0c78741] | 613 | } |
---|
| 614 | |
---|
[09800e9] | 615 | void BlockInternal(__finish_callback_fptr_t callback) { |
---|
| 616 | disable_interrupts(); |
---|
| 617 | with( *kernelTLS.this_processor ) { |
---|
| 618 | finish.action_code = Callback; |
---|
| 619 | finish.callback = callback; |
---|
| 620 | } |
---|
| 621 | |
---|
| 622 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 623 | returnToKernel(); |
---|
| 624 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 625 | |
---|
| 626 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
| 627 | } |
---|
| 628 | |
---|
[14a61b5] | 629 | // KERNEL ONLY |
---|
[ea7d2b0] | 630 | void LeaveThread(__spinlock_t * lock, thread_desc * thrd) { |
---|
[14a61b5] | 631 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 632 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 633 | finish.action_code = thrd ? Release_Schedule : Release; |
---|
| 634 | finish.lock = lock; |
---|
| 635 | finish.thrd = thrd; |
---|
| 636 | } |
---|
[f2b12406] | 637 | |
---|
[82c948c] | 638 | returnToKernel(); |
---|
[f2b12406] | 639 | } |
---|
| 640 | |
---|
[fa21ac9] | 641 | //============================================================================================= |
---|
| 642 | // Kernel Setup logic |
---|
| 643 | //============================================================================================= |
---|
[eb2e723] | 644 | //----------------------------------------------------------------------------- |
---|
| 645 | // Kernel boot procedures |
---|
[c29c342] | 646 | static void kernel_startup(void) { |
---|
[14a61b5] | 647 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 648 | __cfaabi_dbg_print_safe("Kernel : Starting\n"); |
---|
[eb2e723] | 649 | |
---|
[b2f6113] | 650 | __page_size = sysconf( _SC_PAGESIZE ); |
---|
| 651 | |
---|
[ea8b2f7] | 652 | __cfa_dbg_global_clusters.list{ __get }; |
---|
| 653 | __cfa_dbg_global_clusters.lock{}; |
---|
[de94a60] | 654 | |
---|
[de6319f] | 655 | // Initialize the main cluster |
---|
| 656 | mainCluster = (cluster *)&storage_mainCluster; |
---|
| 657 | (*mainCluster){"Main Cluster"}; |
---|
| 658 | |
---|
| 659 | __cfaabi_dbg_print_safe("Kernel : Main cluster ready\n"); |
---|
| 660 | |
---|
[eb2e723] | 661 | // Start by initializing the main thread |
---|
[1c273d0] | 662 | // SKULLDUGGERY: the mainThread steals the process main thread |
---|
[969b3fe] | 663 | // which will then be scheduled by the mainProcessor normally |
---|
| 664 | mainThread = (thread_desc *)&storage_mainThread; |
---|
[8fcbb4c] | 665 | current_stack_info_t info; |
---|
[b2f6113] | 666 | info.storage = (__stack_t*)&storage_mainThreadCtx; |
---|
[83a071f9] | 667 | (*mainThread){ &info }; |
---|
[eb2e723] | 668 | |
---|
[36982fc] | 669 | __cfaabi_dbg_print_safe("Kernel : Main thread ready\n"); |
---|
[fa21ac9] | 670 | |
---|
[bd98b58] | 671 | |
---|
[de6319f] | 672 | |
---|
| 673 | // Construct the processor context of the main processor |
---|
| 674 | void ?{}(processorCtx_t & this, processor * proc) { |
---|
| 675 | (this.__cor){ "Processor" }; |
---|
| 676 | this.__cor.starter = NULL; |
---|
| 677 | this.proc = proc; |
---|
| 678 | } |
---|
| 679 | |
---|
| 680 | void ?{}(processor & this) with( this ) { |
---|
| 681 | name = "Main Processor"; |
---|
| 682 | cltr = mainCluster; |
---|
| 683 | terminated{ 0 }; |
---|
| 684 | do_terminate = false; |
---|
| 685 | preemption_alarm = NULL; |
---|
| 686 | pending_preemption = false; |
---|
| 687 | kernel_thread = pthread_self(); |
---|
| 688 | |
---|
| 689 | runner{ &this }; |
---|
| 690 | __cfaabi_dbg_print_safe("Kernel : constructed main processor context %p\n", &runner); |
---|
| 691 | } |
---|
[fa21ac9] | 692 | |
---|
[969b3fe] | 693 | // Initialize the main processor and the main processor ctx |
---|
[eb2e723] | 694 | // (the coroutine that contains the processing control flow) |
---|
[969b3fe] | 695 | mainProcessor = (processor *)&storage_mainProcessor; |
---|
[de6319f] | 696 | (*mainProcessor){}; |
---|
[eb2e723] | 697 | |
---|
[dcb42b8] | 698 | //initialize the global state variables |
---|
[14a61b5] | 699 | kernelTLS.this_processor = mainProcessor; |
---|
| 700 | kernelTLS.this_thread = mainThread; |
---|
[eb2e723] | 701 | |
---|
[82ff5845] | 702 | // Enable preemption |
---|
| 703 | kernel_start_preemption(); |
---|
| 704 | |
---|
[969b3fe] | 705 | // Add the main thread to the ready queue |
---|
| 706 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
---|
| 707 | ScheduleThread(mainThread); |
---|
| 708 | |
---|
| 709 | // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX |
---|
[dcb42b8] | 710 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
---|
[1c273d0] | 711 | // mainThread is on the ready queue when this call is made. |
---|
[14a61b5] | 712 | kernel_first_resume( kernelTLS.this_processor ); |
---|
[eb2e723] | 713 | |
---|
[dcb42b8] | 714 | |
---|
| 715 | |
---|
| 716 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
---|
[36982fc] | 717 | __cfaabi_dbg_print_safe("Kernel : Started\n--------------------------------------------------\n\n"); |
---|
[82ff5845] | 718 | |
---|
[14a61b5] | 719 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 720 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[afd550c] | 721 | verify( TL_GET( preemption_state.enabled ) ); |
---|
[eb2e723] | 722 | } |
---|
| 723 | |
---|
[c29c342] | 724 | static void kernel_shutdown(void) { |
---|
[36982fc] | 725 | __cfaabi_dbg_print_safe("\n--------------------------------------------------\nKernel : Shutting down\n"); |
---|
[eb2e723] | 726 | |
---|
[afd550c] | 727 | verify( TL_GET( preemption_state.enabled ) ); |
---|
[4e6fb8e] | 728 | disable_interrupts(); |
---|
[14a61b5] | 729 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[4e6fb8e] | 730 | |
---|
[969b3fe] | 731 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
---|
[dcb42b8] | 732 | // When its coroutine terminates, it return control to the mainThread |
---|
| 733 | // which is currently here |
---|
[ea8b2f7] | 734 | __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE); |
---|
[e8e457e] | 735 | kernel_last_resume( kernelTLS.this_processor ); |
---|
[ea8b2f7] | 736 | mainThread->self_cor.state = Halted; |
---|
[eb2e723] | 737 | |
---|
[dcb42b8] | 738 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
---|
[eb2e723] | 739 | |
---|
[82ff5845] | 740 | // Disable preemption |
---|
| 741 | kernel_stop_preemption(); |
---|
| 742 | |
---|
[969b3fe] | 743 | // Destroy the main processor and its context in reverse order of construction |
---|
[dcb42b8] | 744 | // These were manually constructed so we need manually destroy them |
---|
[094476d] | 745 | ^(mainProcessor->runner){}; |
---|
[969b3fe] | 746 | ^(mainProcessor){}; |
---|
[eb2e723] | 747 | |
---|
[dcb42b8] | 748 | // Final step, destroy the main thread since it is no longer needed |
---|
| 749 | // Since we provided a stack to this taxk it will not destroy anything |
---|
[eb2e723] | 750 | ^(mainThread){}; |
---|
| 751 | |
---|
[ea8b2f7] | 752 | ^(__cfa_dbg_global_clusters.list){}; |
---|
| 753 | ^(__cfa_dbg_global_clusters.lock){}; |
---|
[a1a17a74] | 754 | |
---|
[36982fc] | 755 | __cfaabi_dbg_print_safe("Kernel : Shutdown complete\n"); |
---|
[9d944b2] | 756 | } |
---|
| 757 | |
---|
[14a61b5] | 758 | //============================================================================================= |
---|
| 759 | // Kernel Quiescing |
---|
| 760 | //============================================================================================= |
---|
[c29c342] | 761 | static void halt(processor * this) with( *this ) { |
---|
[85b1deb] | 762 | // verify( ! __atomic_load_n(&do_terminate, __ATOMIC_SEQ_CST) ); |
---|
[ea8b2f7] | 763 | |
---|
[6b4cdd3] | 764 | with( *cltr ) { |
---|
| 765 | lock (proc_list_lock __cfaabi_dbg_ctx2); |
---|
| 766 | remove (procs, *this); |
---|
| 767 | push_front(idles, *this); |
---|
| 768 | unlock (proc_list_lock); |
---|
| 769 | } |
---|
[14a61b5] | 770 | |
---|
[6b4cdd3] | 771 | __cfaabi_dbg_print_safe("Kernel : Processor %p ready to sleep\n", this); |
---|
[14a61b5] | 772 | |
---|
[85b1deb] | 773 | wait( idleLock ); |
---|
[14a61b5] | 774 | |
---|
[6b4cdd3] | 775 | __cfaabi_dbg_print_safe("Kernel : Processor %p woke up and ready to run\n", this); |
---|
[14a61b5] | 776 | |
---|
[6b4cdd3] | 777 | with( *cltr ) { |
---|
| 778 | lock (proc_list_lock __cfaabi_dbg_ctx2); |
---|
| 779 | remove (idles, *this); |
---|
| 780 | push_front(procs, *this); |
---|
| 781 | unlock (proc_list_lock); |
---|
| 782 | } |
---|
| 783 | } |
---|
| 784 | |
---|
[dbe9b08] | 785 | //============================================================================================= |
---|
| 786 | // Unexpected Terminating logic |
---|
| 787 | //============================================================================================= |
---|
[ea7d2b0] | 788 | static __spinlock_t kernel_abort_lock; |
---|
[9d944b2] | 789 | static bool kernel_abort_called = false; |
---|
| 790 | |
---|
[afd550c] | 791 | void * kernel_abort(void) __attribute__ ((__nothrow__)) { |
---|
[9d944b2] | 792 | // abort cannot be recursively entered by the same or different processors because all signal handlers return when |
---|
| 793 | // the globalAbort flag is true. |
---|
[36982fc] | 794 | lock( kernel_abort_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 795 | |
---|
| 796 | // first task to abort ? |
---|
[de94a60] | 797 | if ( kernel_abort_called ) { // not first task to abort ? |
---|
[ea7d2b0] | 798 | unlock( kernel_abort_lock ); |
---|
[1c273d0] | 799 | |
---|
[9d944b2] | 800 | sigset_t mask; |
---|
| 801 | sigemptyset( &mask ); |
---|
[de94a60] | 802 | sigaddset( &mask, SIGALRM ); // block SIGALRM signals |
---|
| 803 | sigsuspend( &mask ); // block the processor to prevent further damage during abort |
---|
| 804 | _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it |
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| 805 | } |
---|
| 806 | else { |
---|
| 807 | kernel_abort_called = true; |
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| 808 | unlock( kernel_abort_lock ); |
---|
[9d944b2] | 809 | } |
---|
| 810 | |
---|
[14a61b5] | 811 | return kernelTLS.this_thread; |
---|
[9d944b2] | 812 | } |
---|
| 813 | |
---|
| 814 | void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) { |
---|
| 815 | thread_desc * thrd = kernel_data; |
---|
| 816 | |
---|
[de94a60] | 817 | if(thrd) { |
---|
| 818 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[36982fc] | 819 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[de94a60] | 820 | |
---|
[212c2187] | 821 | if ( &thrd->self_cor != thrd->curr_cor ) { |
---|
| 822 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor ); |
---|
[de94a60] | 823 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
| 824 | } |
---|
| 825 | else { |
---|
| 826 | __cfaabi_dbg_bits_write( ".\n", 2 ); |
---|
| 827 | } |
---|
[1c273d0] | 828 | } |
---|
[9d944b2] | 829 | else { |
---|
[de94a60] | 830 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
[639991a] | 831 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[9d944b2] | 832 | } |
---|
| 833 | } |
---|
| 834 | |
---|
[2b8bc41] | 835 | int kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
[14a61b5] | 836 | return get_coroutine(kernelTLS.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
[2b8bc41] | 837 | } |
---|
| 838 | |
---|
[de94a60] | 839 | static __spinlock_t kernel_debug_lock; |
---|
| 840 | |
---|
[9d944b2] | 841 | extern "C" { |
---|
[36982fc] | 842 | void __cfaabi_dbg_bits_acquire() { |
---|
| 843 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 844 | } |
---|
| 845 | |
---|
[36982fc] | 846 | void __cfaabi_dbg_bits_release() { |
---|
[ea7d2b0] | 847 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 848 | } |
---|
[8118303] | 849 | } |
---|
| 850 | |
---|
[fa21ac9] | 851 | //============================================================================================= |
---|
| 852 | // Kernel Utilities |
---|
| 853 | //============================================================================================= |
---|
[bd98b58] | 854 | //----------------------------------------------------------------------------- |
---|
| 855 | // Locks |
---|
[242a902] | 856 | void ?{}( semaphore & this, int count = 1 ) { |
---|
| 857 | (this.lock){}; |
---|
| 858 | this.count = count; |
---|
| 859 | (this.waiting){}; |
---|
[db6f06a] | 860 | } |
---|
[242a902] | 861 | void ^?{}(semaphore & this) {} |
---|
[db6f06a] | 862 | |
---|
[65deb18] | 863 | void P(semaphore & this) with( this ){ |
---|
| 864 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 865 | count -= 1; |
---|
| 866 | if ( count < 0 ) { |
---|
[bdeba0b] | 867 | // queue current task |
---|
[14a61b5] | 868 | append( waiting, kernelTLS.this_thread ); |
---|
[bdeba0b] | 869 | |
---|
| 870 | // atomically release spin lock and block |
---|
[65deb18] | 871 | BlockInternal( &lock ); |
---|
[8def349] | 872 | } |
---|
[4e6fb8e] | 873 | else { |
---|
[65deb18] | 874 | unlock( lock ); |
---|
[4e6fb8e] | 875 | } |
---|
[bd98b58] | 876 | } |
---|
| 877 | |
---|
[65deb18] | 878 | void V(semaphore & this) with( this ) { |
---|
[bdeba0b] | 879 | thread_desc * thrd = NULL; |
---|
[65deb18] | 880 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 881 | count += 1; |
---|
| 882 | if ( count <= 0 ) { |
---|
[bdeba0b] | 883 | // remove task at head of waiting list |
---|
[65deb18] | 884 | thrd = pop_head( waiting ); |
---|
[bd98b58] | 885 | } |
---|
[bdeba0b] | 886 | |
---|
[65deb18] | 887 | unlock( lock ); |
---|
[bdeba0b] | 888 | |
---|
| 889 | // make new owner |
---|
| 890 | WakeThread( thrd ); |
---|
[bd98b58] | 891 | } |
---|
| 892 | |
---|
[f7d6bb0] | 893 | //----------------------------------------------------------------------------- |
---|
[de94a60] | 894 | // Global Queues |
---|
| 895 | void doregister( cluster & cltr ) { |
---|
[ea8b2f7] | 896 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
| 897 | push_front( __cfa_dbg_global_clusters.list, cltr ); |
---|
| 898 | unlock ( __cfa_dbg_global_clusters.lock ); |
---|
[de94a60] | 899 | } |
---|
[f7d6bb0] | 900 | |
---|
[de94a60] | 901 | void unregister( cluster & cltr ) { |
---|
[ea8b2f7] | 902 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
| 903 | remove( __cfa_dbg_global_clusters.list, cltr ); |
---|
| 904 | unlock( __cfa_dbg_global_clusters.lock ); |
---|
[de94a60] | 905 | } |
---|
[f7d6bb0] | 906 | |
---|
[a1a17a74] | 907 | void doregister( cluster * cltr, thread_desc & thrd ) { |
---|
| 908 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
[d4e68a6] | 909 | cltr->nthreads += 1; |
---|
[a1a17a74] | 910 | push_front(cltr->threads, thrd); |
---|
| 911 | unlock (cltr->thread_list_lock); |
---|
| 912 | } |
---|
| 913 | |
---|
| 914 | void unregister( cluster * cltr, thread_desc & thrd ) { |
---|
| 915 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
| 916 | remove(cltr->threads, thrd ); |
---|
[d4e68a6] | 917 | cltr->nthreads -= 1; |
---|
[a1a17a74] | 918 | unlock(cltr->thread_list_lock); |
---|
| 919 | } |
---|
[9181f1d] | 920 | |
---|
[de94a60] | 921 | void doregister( cluster * cltr, processor * proc ) { |
---|
[639991a] | 922 | lock (cltr->proc_list_lock __cfaabi_dbg_ctx2); |
---|
[d4e68a6] | 923 | cltr->nprocessors += 1; |
---|
[639991a] | 924 | push_front(cltr->procs, *proc); |
---|
| 925 | unlock (cltr->proc_list_lock); |
---|
[de94a60] | 926 | } |
---|
| 927 | |
---|
| 928 | void unregister( cluster * cltr, processor * proc ) { |
---|
[639991a] | 929 | lock (cltr->proc_list_lock __cfaabi_dbg_ctx2); |
---|
| 930 | remove(cltr->procs, *proc ); |
---|
[d4e68a6] | 931 | cltr->nprocessors -= 1; |
---|
[639991a] | 932 | unlock(cltr->proc_list_lock); |
---|
[de94a60] | 933 | } |
---|
| 934 | |
---|
| 935 | //----------------------------------------------------------------------------- |
---|
| 936 | // Debug |
---|
| 937 | __cfaabi_dbg_debug_do( |
---|
[1997b4e] | 938 | extern "C" { |
---|
| 939 | void __cfaabi_dbg_record(__spinlock_t & this, const char * prev_name) { |
---|
| 940 | this.prev_name = prev_name; |
---|
| 941 | this.prev_thrd = kernelTLS.this_thread; |
---|
| 942 | } |
---|
[9181f1d] | 943 | } |
---|
[f7d6bb0] | 944 | ) |
---|
[8118303] | 945 | // Local Variables: // |
---|
| 946 | // mode: c // |
---|
| 947 | // tab-width: 4 // |
---|
| 948 | // End: // |
---|