[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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[dd46fd3] | 12 | // Last Modified On : Wed Nov 30 18:14:08 2022 |
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| 13 | // Update Count : 76 |
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[8118303] | 14 | // |
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| 15 | |
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[2026bb6] | 16 | #define __cforall_thread__ |
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[43784ac] | 17 | #define _GNU_SOURCE |
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| 18 | |
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[4069faad] | 19 | // #define __CFA_DEBUG_PRINT_RUNTIME_CORE__ |
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[2026bb6] | 20 | |
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[bfb9bf5] | 21 | #pragma GCC diagnostic push |
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| 22 | #pragma GCC diagnostic ignored "-Waddress-of-packed-member" |
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| 23 | |
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[8118303] | 24 | //C Includes |
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[214e8da] | 25 | #include <errno.h> |
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[9d944b2] | 26 | #include <stdio.h> |
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[445f984] | 27 | #include <string.h> |
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[58b6d1b] | 28 | #include <signal.h> |
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[9d944b2] | 29 | #include <unistd.h> |
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[bfb9bf5] | 30 | |
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[dddb3dd0] | 31 | extern "C" { |
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| 32 | #include <sys/eventfd.h> |
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[d3605f8] | 33 | #include <sys/uio.h> |
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[dddb3dd0] | 34 | } |
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[8118303] | 35 | |
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| 36 | //CFA Includes |
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[708ae38] | 37 | #include "kernel/private.hfa" |
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[73abe95] | 38 | #include "preemption.hfa" |
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[445f984] | 39 | #include "strstream.hfa" |
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| 40 | #include "device/cpu.hfa" |
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[7ef162b2] | 41 | #include "io/types.hfa" |
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[8118303] | 42 | |
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| 43 | //Private includes |
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| 44 | #define __CFA_INVOKE_PRIVATE__ |
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| 45 | #include "invoke.h" |
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[bfb9bf5] | 46 | #pragma GCC diagnostic pop |
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[8118303] | 47 | |
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[89eff25] | 48 | #if !defined(__CFA_NO_STATISTICS__) |
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[c9c1c1c] | 49 | #define __STATS_DEF( ...) __VA_ARGS__ |
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[89eff25] | 50 | #else |
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[c9c1c1c] | 51 | #define __STATS_DEF( ...) |
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[89eff25] | 52 | #endif |
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[4069faad] | 53 | |
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[deca0f5] | 54 | //----------------------------------------------------------------------------- |
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| 55 | // Some assembly required |
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[1805b1b] | 56 | #if defined( __i386 ) |
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[deca0f5] | 57 | // mxcr : SSE Status and Control bits (control bits are preserved across function calls) |
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| 58 | // fcw : X87 FPU control word (preserved across function calls) |
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| 59 | #define __x87_store \ |
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| 60 | uint32_t __mxcr; \ |
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| 61 | uint16_t __fcw; \ |
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| 62 | __asm__ volatile ( \ |
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| 63 | "stmxcsr %0\n" \ |
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| 64 | "fnstcw %1\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 | #define __x87_load \ |
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| 70 | __asm__ volatile ( \ |
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| 71 | "fldcw %1\n" \ |
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| 72 | "ldmxcsr %0\n" \ |
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| 73 | ::"m" (__mxcr),\ |
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| 74 | "m" (__fcw) \ |
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| 75 | ) |
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| 76 | |
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| 77 | #elif defined( __x86_64 ) |
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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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[0190480] | 96 | #elif defined( __arm__ ) |
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| 97 | #define __x87_store |
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| 98 | #define __x87_load |
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| 99 | |
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| 100 | #elif defined( __aarch64__ ) |
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[74f5c83] | 101 | #define __x87_store \ |
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| 102 | uint32_t __fpcntl[2]; \ |
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| 103 | __asm__ volatile ( \ |
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| 104 | "mrs x9, FPCR\n" \ |
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| 105 | "mrs x10, FPSR\n" \ |
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| 106 | "stp x9, x10, %0\n" \ |
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| 107 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 108 | ) |
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| 109 | |
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| 110 | #define __x87_load \ |
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| 111 | __asm__ volatile ( \ |
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| 112 | "ldp x9, x10, %0\n" \ |
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| 113 | "msr FPSR, x10\n" \ |
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| 114 | "msr FPCR, x9\n" \ |
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| 115 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 116 | ) |
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| 117 | |
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[deca0f5] | 118 | #else |
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[0190480] | 119 | #error unsupported hardware architecture |
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[deca0f5] | 120 | #endif |
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| 121 | |
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[e84ab3d] | 122 | extern thread$ * mainThread; |
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[e660761] | 123 | extern processor * mainProcessor; |
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[2ac095d] | 124 | |
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[92e7631] | 125 | //----------------------------------------------------------------------------- |
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| 126 | // Kernel Scheduling logic |
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[e84ab3d] | 127 | static thread$ * __next_thread(cluster * this); |
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| 128 | static thread$ * __next_thread_slow(cluster * this); |
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[c9c1c1c] | 129 | static thread$ * __next_thread_search(cluster * this); |
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[e84ab3d] | 130 | static inline bool __must_unpark( thread$ * thrd ) __attribute((nonnull(1))); |
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| 131 | static void __run_thread(processor * this, thread$ * dst); |
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[e873838] | 132 | static void __wake_one(cluster * cltr); |
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[1eb239e4] | 133 | |
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[18f7858] | 134 | static void idle_sleep(processor * proc); |
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[5f5a729] | 135 | static bool mark_idle (__cluster_proc_list & idles, processor & proc); |
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[6a9b12b] | 136 | static void mark_awake(__cluster_proc_list & idles, processor & proc); |
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[1eb239e4] | 137 | |
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[4479890] | 138 | extern bool __cfa_io_drain( processor * proc ) __attribute__((nonnull (1))); |
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[18f7858] | 139 | extern bool __cfa_io_flush( processor * ) __attribute__((nonnull (1))); |
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[dddb3dd0] | 140 | |
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[7ef162b2] | 141 | |
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[dddb3dd0] | 142 | extern void __disable_interrupts_hard(); |
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| 143 | extern void __enable_interrupts_hard(); |
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[c84e80a] | 144 | |
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[7ef162b2] | 145 | |
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[75f3522] | 146 | //============================================================================================= |
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| 147 | // Kernel Scheduling logic |
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| 148 | //============================================================================================= |
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[8fcbb4c] | 149 | //Main of the processor contexts |
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[83a071f9] | 150 | void main(processorCtx_t & runner) { |
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[21184e3] | 151 | // Because of a bug, we couldn't initialized the seed on construction |
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| 152 | // Do it here |
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[dd46fd3] | 153 | PRNG_SET_SEED( __cfaabi_tls.random_state, rdtscl() ); |
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[8fc652e0] | 154 | __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&runner); |
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[f2384c9a] | 155 | __tls_rand_advance_bck(); |
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[21184e3] | 156 | |
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[83a071f9] | 157 | processor * this = runner.proc; |
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[094476d] | 158 | verify(this); |
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[c81ebf9] | 159 | |
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[4069faad] | 160 | __cfadbg_print_safe(runtime_core, "Kernel : core %p starting\n", this); |
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[28d73c1] | 161 | #if !defined(__CFA_NO_STATISTICS__) |
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| 162 | if( this->print_halts ) { |
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[c993b15] | 163 | __cfaabi_bits_print_safe( STDOUT_FILENO, "Processor : %d - %s (%p)\n", this->unique_id, this->name, (void*)this); |
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[28d73c1] | 164 | } |
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| 165 | #endif |
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[b798713] | 166 | |
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[75f3522] | 167 | { |
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[c81ebf9] | 168 | // Setup preemption data |
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| 169 | preemption_scope scope = { this }; |
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| 170 | |
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[a5e7233] | 171 | // if we need to run some special setup, now is the time to do it. |
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| 172 | if(this->init.thrd) { |
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| 173 | this->init.thrd->curr_cluster = this->cltr; |
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| 174 | __run_thread(this, this->init.thrd); |
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| 175 | } |
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[325e6ea] | 176 | |
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[4069faad] | 177 | __cfadbg_print_safe(runtime_core, "Kernel : core %p started\n", this); |
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[8118303] | 178 | |
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[e84ab3d] | 179 | thread$ * readyThread = 0p; |
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[1eb239e4] | 180 | MAIN_LOOP: |
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| 181 | for() { |
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[dddb3dd0] | 182 | // Check if there is pending io |
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[18f7858] | 183 | __cfa_io_drain( this ); |
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[dddb3dd0] | 184 | |
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[92e7631] | 185 | // Try to get the next thread |
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[8c50aed] | 186 | readyThread = __next_thread( this->cltr ); |
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[75f3522] | 187 | |
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[1eb239e4] | 188 | if( !readyThread ) { |
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[18f7858] | 189 | // there is no point in holding submissions if we are idle |
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[c9c1c1c] | 190 | __IO_STATS__(true, io.flush.idle++; ) |
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[18f7858] | 191 | __cfa_io_flush( this ); |
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| 192 | |
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| 193 | // drain again in case something showed up |
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| 194 | __cfa_io_drain( this ); |
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[c33c2af] | 195 | |
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[c9c1c1c] | 196 | readyThread = __next_thread( this->cltr ); |
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| 197 | } |
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| 198 | |
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| 199 | if( !readyThread ) for(5) { |
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[1eb239e4] | 200 | readyThread = __next_thread_slow( this->cltr ); |
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[c9c1c1c] | 201 | |
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| 202 | if( readyThread ) break; |
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| 203 | |
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[18f7858] | 204 | // It's unlikely we still I/O to submit, but the arbiter could |
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| 205 | __IO_STATS__(true, io.flush.idle++; ) |
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| 206 | __cfa_io_flush( this ); |
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| 207 | |
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| 208 | // drain again in case something showed up |
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| 209 | __cfa_io_drain( this ); |
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[1eb239e4] | 210 | } |
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[4e6fb8e] | 211 | |
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[1eb239e4] | 212 | HALT: |
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| 213 | if( !readyThread ) { |
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| 214 | // Don't block if we are done |
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| 215 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[c81ebf9] | 216 | |
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[1eb239e4] | 217 | // Push self to idle stack |
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[5f5a729] | 218 | if(!mark_idle(this->cltr->procs, * this)) continue MAIN_LOOP; |
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[398e8e9] | 219 | |
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[1eb239e4] | 220 | // Confirm the ready-queue is empty |
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[c9c1c1c] | 221 | readyThread = __next_thread_search( this->cltr ); |
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[1eb239e4] | 222 | if( readyThread ) { |
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| 223 | // A thread was found, cancel the halt |
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[6a9b12b] | 224 | mark_awake(this->cltr->procs, * this); |
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[1eb239e4] | 225 | |
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[c9c1c1c] | 226 | __STATS__(true, ready.sleep.cancels++; ) |
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[1eb239e4] | 227 | |
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| 228 | // continue the mai loop |
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| 229 | break HALT; |
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| 230 | } |
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| 231 | |
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[18f7858] | 232 | idle_sleep( this ); |
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[1eb239e4] | 233 | |
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| 234 | // We were woken up, remove self from idle |
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[6a9b12b] | 235 | mark_awake(this->cltr->procs, * this); |
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[1eb239e4] | 236 | |
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| 237 | // DON'T just proceed, start looking again |
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| 238 | continue MAIN_LOOP; |
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[64a7146] | 239 | } |
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[1eb239e4] | 240 | |
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| 241 | /* paranoid */ verify( readyThread ); |
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| 242 | |
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[dddb3dd0] | 243 | // Reset io dirty bit |
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| 244 | this->io.dirty = false; |
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| 245 | |
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[1eb239e4] | 246 | // We found a thread run it |
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| 247 | __run_thread(this, readyThread); |
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| 248 | |
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| 249 | // Are we done? |
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| 250 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[325e6ea] | 251 | |
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[d529ad0] | 252 | if(__atomic_load_n(&this->io.pending, __ATOMIC_RELAXED) && !__atomic_load_n(&this->io.dirty, __ATOMIC_RELAXED)) { |
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[c9c1c1c] | 253 | __IO_STATS__(true, io.flush.dirty++; ) |
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[18f7858] | 254 | __cfa_io_flush( this ); |
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[dddb3dd0] | 255 | } |
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[c81ebf9] | 256 | } |
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| 257 | |
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[4069faad] | 258 | __cfadbg_print_safe(runtime_core, "Kernel : core %p stopping\n", this); |
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[c84e80a] | 259 | } |
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[8118303] | 260 | |
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[26544f9] | 261 | __cfa_io_flush( this ); |
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| 262 | __cfa_io_drain( this ); |
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| 263 | |
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[454f478] | 264 | post( this->terminated ); |
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[bdeba0b] | 265 | |
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[28d73c1] | 266 | if(this == mainProcessor) { |
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[6a490b2] | 267 | // HACK : the coroutine context switch expects this_thread to be set |
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| 268 | // and it make sense for it to be set in all other cases except here |
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| 269 | // fake it |
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[8fc652e0] | 270 | __cfaabi_tls.this_thread = mainThread; |
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[6a490b2] | 271 | } |
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[7768b8d] | 272 | |
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[4069faad] | 273 | __cfadbg_print_safe(runtime_core, "Kernel : core %p terminated\n", this); |
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[c84e80a] | 274 | } |
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| 275 | |
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[5c1a531] | 276 | static int * __volatile_errno() __attribute__((noinline)); |
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| 277 | static int * __volatile_errno() { asm(""); return &errno; } |
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| 278 | |
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[14a61b5] | 279 | // KERNEL ONLY |
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[1c273d0] | 280 | // runThread runs a thread by context switching |
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| 281 | // from the processor coroutine to the target thread |
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[e84ab3d] | 282 | static void __run_thread(processor * this, thread$ * thrd_dst) { |
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[8fc652e0] | 283 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[1eb239e4] | 284 | /* paranoid */ verifyf( thrd_dst->state == Ready || thrd_dst->preempted != __NO_PREEMPTION, "state : %d, preempted %d\n", thrd_dst->state, thrd_dst->preempted); |
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[15c93d8] | 285 | /* paranoid */ verifyf( thrd_dst->rdy_link.next == 0p, "Expected null got %p", thrd_dst->rdy_link.next ); |
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[1eb239e4] | 286 | __builtin_prefetch( thrd_dst->context.SP ); |
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| 287 | |
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[dddb3dd0] | 288 | __cfadbg_print_safe(runtime_core, "Kernel : core %p running thread %p (%s)\n", this, thrd_dst, thrd_dst->self_cor.name); |
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| 289 | |
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[e84ab3d] | 290 | coroutine$ * proc_cor = get_coroutine(this->runner); |
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[8fcbb4c] | 291 | |
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[9f575ea] | 292 | // set state of processor coroutine to inactive |
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| 293 | verify(proc_cor->state == Active); |
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[ae7be7a] | 294 | proc_cor->state = Blocked; |
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[e8e457e] | 295 | |
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[9f575ea] | 296 | // Actually run the thread |
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[3381ed7] | 297 | RUNNING: while(true) { |
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[ff79d5e] | 298 | thrd_dst->preempted = __NO_PREEMPTION; |
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[e8e457e] | 299 | |
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[58d64a4] | 300 | // Update global state |
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[8fc652e0] | 301 | kernelTLS().this_thread = thrd_dst; |
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[75f3522] | 302 | |
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[8bee858] | 303 | // Update the state after setting this_thread |
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| 304 | // so that the debugger can find all active threads |
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| 305 | // in tls storage |
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| 306 | thrd_dst->state = Active; |
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| 307 | |
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[8fc652e0] | 308 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 309 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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[9d6e1b8a] | 310 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
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[b4b63e8] | 311 | /* paranoid */ verify( thrd_dst->context.SP ); |
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[5afb49a] | 312 | /* paranoid */ verify( thrd_dst->state != Halted ); |
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[e84ab3d] | 313 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->curr_cor == proc_cor || thrd_dst->corctx_flag, "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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| 314 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->curr_cor == proc_cor || thrd_dst->corctx_flag, "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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[878cfcc] | 315 | /* paranoid */ verify( __atomic_exchange_n( &thrd_dst->executing, this, __ATOMIC_SEQ_CST) == 0p ); |
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[ac12f1f] | 316 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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[b4b63e8] | 317 | |
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[3381ed7] | 318 | |
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[58d64a4] | 319 | |
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[9f575ea] | 320 | // set context switch to the thread that the processor is executing |
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[c7a900a] | 321 | __cfactx_switch( &proc_cor->context, &thrd_dst->context ); |
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| 322 | // when __cfactx_switch returns we are back in the processor coroutine |
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[9f575ea] | 323 | |
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[50871b4] | 324 | |
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| 325 | |
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[ac12f1f] | 326 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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[878cfcc] | 327 | /* paranoid */ verify( __atomic_exchange_n( &thrd_dst->executing, 0p, __ATOMIC_SEQ_CST) == this ); |
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[e84ab3d] | 328 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); |
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| 329 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); |
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[878cfcc] | 330 | /* paranoid */ verify( thrd_dst->state != Halted ); |
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[b4b63e8] | 331 | /* paranoid */ verify( thrd_dst->context.SP ); |
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[8fc652e0] | 332 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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| 333 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[75f3522] | 334 | |
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[3381ed7] | 335 | // We just finished running a thread, there are a few things that could have happened. |
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| 336 | // 1 - Regular case : the thread has blocked and now one has scheduled it yet. |
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| 337 | // 2 - Racy case : the thread has blocked but someone has already tried to schedule it. |
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| 338 | // 4 - Preempted |
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| 339 | // In case 1, we may have won a race so we can't write to the state again. |
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| 340 | // In case 2, we lost the race so we now own the thread. |
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| 341 | |
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| 342 | if(unlikely(thrd_dst->preempted != __NO_PREEMPTION)) { |
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[8bee858] | 343 | // Reset the this_thread now that we know |
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| 344 | // the state isn't active anymore |
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| 345 | kernelTLS().this_thread = 0p; |
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| 346 | |
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[3381ed7] | 347 | // The thread was preempted, reschedule it and reset the flag |
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[24e321c] | 348 | schedule_thread$( thrd_dst, UNPARK_LOCAL ); |
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[3381ed7] | 349 | break RUNNING; |
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| 350 | } |
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[75f3522] | 351 | |
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[3ea8ad1] | 352 | if(unlikely(thrd_dst->state == Halting)) { |
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[8bee858] | 353 | // Reset the this_thread now that we know |
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| 354 | // the state isn't active anymore |
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| 355 | kernelTLS().this_thread = 0p; |
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| 356 | |
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[ff79d5e] | 357 | // The thread has halted, it should never be scheduled/run again |
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[5afb49a] | 358 | // finish the thread |
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| 359 | __thread_finish( thrd_dst ); |
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[ff79d5e] | 360 | break RUNNING; |
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| 361 | } |
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| 362 | |
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| 363 | /* paranoid */ verify( thrd_dst->state == Active ); |
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| 364 | thrd_dst->state = Blocked; |
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| 365 | |
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[8bee858] | 366 | // Reset the this_thread now that we know |
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| 367 | // the state isn't active anymore |
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| 368 | kernelTLS().this_thread = 0p; |
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| 369 | |
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[3381ed7] | 370 | // set state of processor coroutine to active and the thread to inactive |
---|
[ff79d5e] | 371 | int old_ticket = __atomic_fetch_sub(&thrd_dst->ticket, 1, __ATOMIC_SEQ_CST); |
---|
| 372 | switch(old_ticket) { |
---|
[6a77224] | 373 | case TICKET_RUNNING: |
---|
[3381ed7] | 374 | // This is case 1, the regular case, nothing more is needed |
---|
| 375 | break RUNNING; |
---|
[6a77224] | 376 | case TICKET_UNBLOCK: |
---|
[c9c1c1c] | 377 | __STATS__(true, ready.threads.threads++; ) |
---|
[3381ed7] | 378 | // This is case 2, the racy case, someone tried to run this thread before it finished blocking |
---|
| 379 | // In this case, just run it again. |
---|
| 380 | continue RUNNING; |
---|
| 381 | default: |
---|
| 382 | // This makes no sense, something is wrong abort |
---|
[ff79d5e] | 383 | abort(); |
---|
[3381ed7] | 384 | } |
---|
[9f575ea] | 385 | } |
---|
[e8e457e] | 386 | |
---|
[9f575ea] | 387 | // Just before returning to the processor, set the processor coroutine to active |
---|
[e8e457e] | 388 | proc_cor->state = Active; |
---|
[1eb239e4] | 389 | |
---|
[dddb3dd0] | 390 | __cfadbg_print_safe(runtime_core, "Kernel : core %p finished running thread %p\n", this, thrd_dst); |
---|
| 391 | |
---|
[c9c1c1c] | 392 | __STATS__(true, ready.threads.threads--; ) |
---|
[ec43cf9] | 393 | |
---|
[8fc652e0] | 394 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[82c948c] | 395 | } |
---|
| 396 | |
---|
[14a61b5] | 397 | // KERNEL_ONLY |
---|
[c18bf9e] | 398 | static void returnToKernel() { |
---|
[8fc652e0] | 399 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e84ab3d] | 400 | coroutine$ * proc_cor = get_coroutine(kernelTLS().this_processor->runner); |
---|
| 401 | thread$ * thrd_src = kernelTLS().this_thread; |
---|
[e8e457e] | 402 | |
---|
[c9c1c1c] | 403 | __STATS_DEF( thrd_src->last_proc = kernelTLS().this_processor; ) |
---|
[29cb302] | 404 | |
---|
[9f575ea] | 405 | // Run the thread on this processor |
---|
| 406 | { |
---|
| 407 | int local_errno = *__volatile_errno(); |
---|
| 408 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 409 | __x87_store; |
---|
| 410 | #endif |
---|
[b4b63e8] | 411 | /* paranoid */ verify( proc_cor->context.SP ); |
---|
[ac12f1f] | 412 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
[c7a900a] | 413 | __cfactx_switch( &thrd_src->context, &proc_cor->context ); |
---|
[ac12f1f] | 414 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
[9f575ea] | 415 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 416 | __x87_load; |
---|
| 417 | #endif |
---|
| 418 | *__volatile_errno() = local_errno; |
---|
[8fcbb4c] | 419 | } |
---|
[deca0f5] | 420 | |
---|
[29cb302] | 421 | #if !defined(__CFA_NO_STATISTICS__) |
---|
[89eff25] | 422 | /* paranoid */ verify( thrd_src->last_proc != 0p ); |
---|
| 423 | if(thrd_src->last_proc != kernelTLS().this_processor) { |
---|
[29cb302] | 424 | __tls_stats()->ready.threads.migration++; |
---|
| 425 | } |
---|
| 426 | #endif |
---|
| 427 | |
---|
[8fc652e0] | 428 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e84ab3d] | 429 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) < ((uintptr_t)__get_stack(thrd_src->curr_cor)->base ) || thrd_src->corctx_flag, "ERROR : Returning thread$ %p has been corrupted.\n StackPointer too small.\n", thrd_src ); |
---|
| 430 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) > ((uintptr_t)__get_stack(thrd_src->curr_cor)->limit) || thrd_src->corctx_flag, "ERROR : Returning thread$ %p has been corrupted.\n StackPointer too large.\n", thrd_src ); |
---|
[c84e80a] | 431 | } |
---|
| 432 | |
---|
[8def349] | 433 | //----------------------------------------------------------------------------- |
---|
| 434 | // Scheduler routines |
---|
[14a61b5] | 435 | // KERNEL ONLY |
---|
[24e321c] | 436 | static void __schedule_thread( thread$ * thrd, unpark_hint hint ) { |
---|
[8fc652e0] | 437 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[254ad1b] | 438 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
[6a490b2] | 439 | /* paranoid */ verify( thrd ); |
---|
| 440 | /* paranoid */ verify( thrd->state != Halted ); |
---|
[9d6e1b8a] | 441 | /* paranoid */ verify( thrd->curr_cluster ); |
---|
[3381ed7] | 442 | /* paranoid */ #if defined( __CFA_WITH_VERIFY__ ) |
---|
[504a7dc] | 443 | /* paranoid */ if( thrd->state == Blocked || thrd->state == Start ) assertf( thrd->preempted == __NO_PREEMPTION, |
---|
| 444 | "Error inactive thread marked as preempted, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[ff79d5e] | 445 | /* paranoid */ if( thrd->preempted != __NO_PREEMPTION ) assertf(thrd->state == Active, |
---|
[504a7dc] | 446 | "Error preempted thread marked as not currently running, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[3381ed7] | 447 | /* paranoid */ #endif |
---|
[15c93d8] | 448 | /* paranoid */ verifyf( thrd->rdy_link.next == 0p, "Expected null got %p", thrd->rdy_link.next ); |
---|
[ac12f1f] | 449 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
[b4b63e8] | 450 | |
---|
[ae7be7a] | 451 | if (thrd->preempted == __NO_PREEMPTION) thrd->state = Ready; |
---|
[6b4cdd3] | 452 | |
---|
[ec43cf9] | 453 | // Dereference the thread now because once we push it, there is not guaranteed it's still valid. |
---|
| 454 | struct cluster * cl = thrd->curr_cluster; |
---|
[c9c1c1c] | 455 | __STATS_DEF(bool outside = hint == UNPARK_LOCAL && thrd->last_proc && thrd->last_proc != kernelTLS().this_processor; ) |
---|
[32a8b61] | 456 | |
---|
[254ad1b] | 457 | // push the thread to the cluster ready-queue |
---|
[24e321c] | 458 | push( cl, thrd, hint ); |
---|
[32a8b61] | 459 | |
---|
[254ad1b] | 460 | // variable thrd is no longer safe to use |
---|
[734908c] | 461 | thrd = 0xdeaddeaddeaddeadp; |
---|
[32a8b61] | 462 | |
---|
[254ad1b] | 463 | // wake the cluster using the save variable. |
---|
| 464 | __wake_one( cl ); |
---|
[1c273d0] | 465 | |
---|
[ec43cf9] | 466 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 467 | if( kernelTLS().this_stats ) { |
---|
| 468 | __tls_stats()->ready.threads.threads++; |
---|
[89eff25] | 469 | if(outside) { |
---|
| 470 | __tls_stats()->ready.threads.extunpark++; |
---|
| 471 | } |
---|
[ec43cf9] | 472 | } |
---|
| 473 | else { |
---|
| 474 | __atomic_fetch_add(&cl->stats->ready.threads.threads, 1, __ATOMIC_RELAXED); |
---|
[89eff25] | 475 | __atomic_fetch_add(&cl->stats->ready.threads.extunpark, 1, __ATOMIC_RELAXED); |
---|
[ec43cf9] | 476 | } |
---|
| 477 | #endif |
---|
| 478 | |
---|
[254ad1b] | 479 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
[8fc652e0] | 480 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[db6f06a] | 481 | } |
---|
| 482 | |
---|
[24e321c] | 483 | void schedule_thread$( thread$ * thrd, unpark_hint hint ) { |
---|
[254ad1b] | 484 | ready_schedule_lock(); |
---|
[24e321c] | 485 | __schedule_thread( thrd, hint ); |
---|
[254ad1b] | 486 | ready_schedule_unlock(); |
---|
| 487 | } |
---|
| 488 | |
---|
[14a61b5] | 489 | // KERNEL ONLY |
---|
[e84ab3d] | 490 | static inline thread$ * __next_thread(cluster * this) with( *this ) { |
---|
[8fc652e0] | 491 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[7768b8d] | 492 | |
---|
[e873838] | 493 | ready_schedule_lock(); |
---|
[e84ab3d] | 494 | thread$ * thrd = pop_fast( this ); |
---|
[e873838] | 495 | ready_schedule_unlock(); |
---|
[7768b8d] | 496 | |
---|
[8fc652e0] | 497 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 498 | return thrd; |
---|
[eb2e723] | 499 | } |
---|
| 500 | |
---|
[64a7146] | 501 | // KERNEL ONLY |
---|
[e84ab3d] | 502 | static inline thread$ * __next_thread_slow(cluster * this) with( *this ) { |
---|
[8fc652e0] | 503 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[64a7146] | 504 | |
---|
[e873838] | 505 | ready_schedule_lock(); |
---|
[c9c1c1c] | 506 | thread$ * thrd = pop_slow( this ); |
---|
| 507 | ready_schedule_unlock(); |
---|
| 508 | |
---|
| 509 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 510 | return thrd; |
---|
| 511 | } |
---|
[fc59df78] | 512 | |
---|
[c9c1c1c] | 513 | // KERNEL ONLY |
---|
| 514 | static inline thread$ * __next_thread_search(cluster * this) with( *this ) { |
---|
| 515 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 516 | |
---|
| 517 | ready_schedule_lock(); |
---|
| 518 | thread$ * thrd = pop_search( this ); |
---|
[e873838] | 519 | ready_schedule_unlock(); |
---|
[64a7146] | 520 | |
---|
[8fc652e0] | 521 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 522 | return thrd; |
---|
[64a7146] | 523 | } |
---|
| 524 | |
---|
[e84ab3d] | 525 | static inline bool __must_unpark( thread$ * thrd ) { |
---|
[ff79d5e] | 526 | int old_ticket = __atomic_fetch_add(&thrd->ticket, 1, __ATOMIC_SEQ_CST); |
---|
| 527 | switch(old_ticket) { |
---|
[6a77224] | 528 | case TICKET_RUNNING: |
---|
[3381ed7] | 529 | // Wake won the race, the thread will reschedule/rerun itself |
---|
[c6c7e6c] | 530 | return false; |
---|
[6a77224] | 531 | case TICKET_BLOCKED: |
---|
[3381ed7] | 532 | /* paranoid */ verify( ! thrd->preempted != __NO_PREEMPTION ); |
---|
[ff79d5e] | 533 | /* paranoid */ verify( thrd->state == Blocked ); |
---|
[c6c7e6c] | 534 | return true; |
---|
[3381ed7] | 535 | default: |
---|
| 536 | // This makes no sense, something is wrong abort |
---|
[7ee8153] | 537 | abort("Thread %p (%s) has mismatch park/unpark\n", thrd, thrd->self_cor.name); |
---|
[de6319f] | 538 | } |
---|
[eb2e723] | 539 | } |
---|
| 540 | |
---|
[24e321c] | 541 | void __kernel_unpark( thread$ * thrd, unpark_hint hint ) { |
---|
[e9c0b4c] | 542 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 543 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
| 544 | |
---|
| 545 | if( !thrd ) return; |
---|
| 546 | |
---|
| 547 | if(__must_unpark(thrd)) { |
---|
| 548 | // Wake lost the race, |
---|
[24e321c] | 549 | __schedule_thread( thrd, hint ); |
---|
[e9c0b4c] | 550 | } |
---|
| 551 | |
---|
| 552 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
| 553 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 554 | } |
---|
| 555 | |
---|
[c18bf9e] | 556 | void unpark( thread$ * thrd, unpark_hint hint ) libcfa_public { |
---|
[c6c7e6c] | 557 | if( !thrd ) return; |
---|
[0b33412] | 558 | |
---|
[c6c7e6c] | 559 | if(__must_unpark(thrd)) { |
---|
| 560 | disable_interrupts(); |
---|
[a3821fa] | 561 | // Wake lost the race, |
---|
[24e321c] | 562 | schedule_thread$( thrd, hint ); |
---|
[a3821fa] | 563 | enable_interrupts(false); |
---|
[de6319f] | 564 | } |
---|
[eb2e723] | 565 | } |
---|
[0b33412] | 566 | |
---|
[c18bf9e] | 567 | void park( void ) libcfa_public { |
---|
[a3821fa] | 568 | __disable_interrupts_checked(); |
---|
| 569 | /* paranoid */ verify( kernelTLS().this_thread->preempted == __NO_PREEMPTION ); |
---|
| 570 | returnToKernel(); |
---|
| 571 | __enable_interrupts_checked(); |
---|
[0c78741] | 572 | |
---|
| 573 | } |
---|
[09800e9] | 574 | |
---|
[5afb49a] | 575 | extern "C" { |
---|
| 576 | // Leave the thread monitor |
---|
| 577 | // last routine called by a thread. |
---|
| 578 | // Should never return |
---|
| 579 | void __cfactx_thrd_leave() { |
---|
[e84ab3d] | 580 | thread$ * thrd = active_thread(); |
---|
| 581 | monitor$ * this = &thrd->self_mon; |
---|
[5afb49a] | 582 | |
---|
| 583 | // Lock the monitor now |
---|
| 584 | lock( this->lock __cfaabi_dbg_ctx2 ); |
---|
| 585 | |
---|
| 586 | disable_interrupts(); |
---|
| 587 | |
---|
[9d6e1b8a] | 588 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 589 | /* paranoid */ verify( thrd->state == Active ); |
---|
| 590 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
| 591 | /* paranoid */ verify( kernelTLS().this_thread == thrd ); |
---|
| 592 | /* paranoid */ verify( thrd->context.SP ); |
---|
[e84ab3d] | 593 | /* paranoid */ verifyf( ((uintptr_t)thrd->context.SP) > ((uintptr_t)__get_stack(thrd->curr_cor)->limit), "ERROR : thread$ %p has been corrupted.\n StackPointer too large.\n", thrd ); |
---|
| 594 | /* paranoid */ verifyf( ((uintptr_t)thrd->context.SP) < ((uintptr_t)__get_stack(thrd->curr_cor)->base ), "ERROR : thread$ %p has been corrupted.\n StackPointer too small.\n", thrd ); |
---|
[9d6e1b8a] | 595 | |
---|
[58688bf] | 596 | if( TICKET_RUNNING != thrd->ticket ) { abort( "Thread terminated with pending unpark" ); } |
---|
[9d6e1b8a] | 597 | if( thrd != this->owner ) { abort( "Thread internal monitor has incorrect owner" ); } |
---|
| 598 | if( this->recursion != 1) { abort( "Thread internal monitor has unbalanced recursion" ); } |
---|
[5afb49a] | 599 | |
---|
[28372f7] | 600 | thrd->state = Halting; |
---|
| 601 | thrd->ticket = TICKET_DEAD; |
---|
| 602 | |
---|
[5afb49a] | 603 | // Leave the thread |
---|
| 604 | returnToKernel(); |
---|
| 605 | |
---|
| 606 | // Control flow should never reach here! |
---|
[9d6e1b8a] | 607 | abort(); |
---|
[5afb49a] | 608 | } |
---|
[09800e9] | 609 | } |
---|
| 610 | |
---|
[14a61b5] | 611 | // KERNEL ONLY |
---|
[c18bf9e] | 612 | bool force_yield( __Preemption_Reason reason ) libcfa_public { |
---|
[a3821fa] | 613 | __disable_interrupts_checked(); |
---|
[e84ab3d] | 614 | thread$ * thrd = kernelTLS().this_thread; |
---|
[a3821fa] | 615 | /* paranoid */ verify(thrd->state == Active); |
---|
| 616 | |
---|
| 617 | // SKULLDUGGERY: It is possible that we are preempting this thread just before |
---|
| 618 | // it was going to park itself. If that is the case and it is already using the |
---|
| 619 | // intrusive fields then we can't use them to preempt the thread |
---|
| 620 | // If that is the case, abandon the preemption. |
---|
| 621 | bool preempted = false; |
---|
[15c93d8] | 622 | if(thrd->rdy_link.next == 0p) { |
---|
[a3821fa] | 623 | preempted = true; |
---|
| 624 | thrd->preempted = reason; |
---|
| 625 | returnToKernel(); |
---|
| 626 | } |
---|
| 627 | __enable_interrupts_checked( false ); |
---|
[3381ed7] | 628 | return preempted; |
---|
[f2b12406] | 629 | } |
---|
| 630 | |
---|
[14a61b5] | 631 | //============================================================================================= |
---|
[92e7631] | 632 | // Kernel Idle Sleep |
---|
[14a61b5] | 633 | //============================================================================================= |
---|
[64a7146] | 634 | // Wake a thread from the front if there are any |
---|
[e873838] | 635 | static void __wake_one(cluster * this) { |
---|
[7cf3b1d] | 636 | eventfd_t val; |
---|
| 637 | |
---|
[8fc652e0] | 638 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e873838] | 639 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[14a61b5] | 640 | |
---|
[64a7146] | 641 | // Check if there is a sleeping processor |
---|
[7cf3b1d] | 642 | struct __fd_waitctx * fdp = __atomic_load_n(&this->procs.fdw, __ATOMIC_SEQ_CST); |
---|
[14a61b5] | 643 | |
---|
[7cf3b1d] | 644 | // If no one is sleeping: we are done |
---|
| 645 | if( fdp == 0p ) return; |
---|
[14a61b5] | 646 | |
---|
[7cf3b1d] | 647 | int fd = 1; |
---|
[22226e4] | 648 | if( __atomic_load_n(&fdp->sem, __ATOMIC_SEQ_CST) != 1 ) { |
---|
| 649 | fd = __atomic_exchange_n(&fdp->sem, 1, __ATOMIC_RELAXED); |
---|
[7cf3b1d] | 650 | } |
---|
[14a61b5] | 651 | |
---|
[7cf3b1d] | 652 | switch(fd) { |
---|
[4ccc150] | 653 | __attribute__((unused)) int ret; |
---|
[7cf3b1d] | 654 | case 0: |
---|
| 655 | // If the processor isn't ready to sleep then the exchange will already wake it up |
---|
| 656 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 657 | if( kernelTLS().this_stats ) { __tls_stats()->ready.sleep.early++; |
---|
| 658 | } else { __atomic_fetch_add(&this->stats->ready.sleep.early, 1, __ATOMIC_RELAXED); } |
---|
| 659 | #endif |
---|
| 660 | break; |
---|
| 661 | case 1: |
---|
| 662 | // If someone else already said they will wake them: we are done |
---|
| 663 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 664 | if( kernelTLS().this_stats ) { __tls_stats()->ready.sleep.seen++; |
---|
| 665 | } else { __atomic_fetch_add(&this->stats->ready.sleep.seen, 1, __ATOMIC_RELAXED); } |
---|
| 666 | #endif |
---|
| 667 | break; |
---|
| 668 | default: |
---|
| 669 | // If the processor was ready to sleep, we need to wake it up with an actual write |
---|
| 670 | val = 1; |
---|
[4ccc150] | 671 | ret = eventfd_write( fd, val ); |
---|
[77adaee] | 672 | /* paranoid */ verifyf( ret == 0, "Expected return to be 0, was %d\n", ret ); |
---|
[7cf3b1d] | 673 | |
---|
| 674 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 675 | if( kernelTLS().this_stats ) { __tls_stats()->ready.sleep.wakes++; |
---|
| 676 | } else { __atomic_fetch_add(&this->stats->ready.sleep.wakes, 1, __ATOMIC_RELAXED); } |
---|
| 677 | #endif |
---|
| 678 | break; |
---|
| 679 | } |
---|
[1eb239e4] | 680 | |
---|
[e873838] | 681 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[8fc652e0] | 682 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 683 | |
---|
| 684 | return; |
---|
[64a7146] | 685 | } |
---|
[14a61b5] | 686 | |
---|
[64a7146] | 687 | // Unconditionnaly wake a thread |
---|
[1eb239e4] | 688 | void __wake_proc(processor * this) { |
---|
[7d0ebd0] | 689 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 690 | |
---|
[64a7146] | 691 | __cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this); |
---|
[14a61b5] | 692 | |
---|
[22226e4] | 693 | this->idle_wctx.sem = 1; |
---|
[7cf3b1d] | 694 | |
---|
[efa28d5] | 695 | this->idle_wctx.wake__time = rdtscl(); |
---|
[262fafd9] | 696 | |
---|
[7d0ebd0] | 697 | eventfd_t val; |
---|
| 698 | val = 1; |
---|
[d080549] | 699 | __attribute__((unused)) int ret = eventfd_write( this->idle_wctx.evfd, val ); |
---|
[7d0ebd0] | 700 | |
---|
[d080549] | 701 | /* paranoid */ verifyf( ret == 0, "Expected return to be 0, was %d\n", ret ); |
---|
[7d0ebd0] | 702 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[92e7631] | 703 | } |
---|
| 704 | |
---|
[18f7858] | 705 | static void idle_sleep(processor * this) { |
---|
[202c80b] | 706 | /* paranoid */ verify( this->idle_wctx.evfd != 1 ); |
---|
| 707 | /* paranoid */ verify( this->idle_wctx.evfd != 2 ); |
---|
| 708 | |
---|
[7cf3b1d] | 709 | // Tell everyone we are ready to go do sleep |
---|
| 710 | for() { |
---|
[22226e4] | 711 | int expected = this->idle_wctx.sem; |
---|
[7cf3b1d] | 712 | |
---|
| 713 | // Someone already told us to wake-up! No time for a nap. |
---|
| 714 | if(expected == 1) { return; } |
---|
| 715 | |
---|
| 716 | // Try to mark that we are going to sleep |
---|
[22226e4] | 717 | if(__atomic_compare_exchange_n(&this->idle_wctx.sem, &expected, this->idle_wctx.evfd, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ) { |
---|
[7cf3b1d] | 718 | // Every one agreed, taking a nap |
---|
| 719 | break; |
---|
| 720 | } |
---|
| 721 | } |
---|
| 722 | |
---|
| 723 | |
---|
[a757ba1] | 724 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 725 | if(this->print_halts) { |
---|
| 726 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->unique_id, rdtscl()); |
---|
| 727 | } |
---|
| 728 | #endif |
---|
[1757f98] | 729 | |
---|
[a757ba1] | 730 | __cfadbg_print_safe(runtime_core, "Kernel : core %p waiting on eventfd %d\n", this, this->idle_fd); |
---|
[1757f98] | 731 | |
---|
[a757ba1] | 732 | { |
---|
| 733 | eventfd_t val; |
---|
| 734 | ssize_t ret = read( this->idle_wctx.evfd, &val, sizeof(val) ); |
---|
| 735 | if(ret < 0) { |
---|
| 736 | switch((int)errno) { |
---|
| 737 | case EAGAIN: |
---|
| 738 | #if EAGAIN != EWOULDBLOCK |
---|
| 739 | case EWOULDBLOCK: |
---|
| 740 | #endif |
---|
| 741 | case EINTR: |
---|
| 742 | // No need to do anything special here, just assume it's a legitimate wake-up |
---|
| 743 | break; |
---|
| 744 | default: |
---|
| 745 | abort( "KERNEL : internal error, read failure on idle eventfd, error(%d) %s.", (int)errno, strerror( (int)errno ) ); |
---|
[1757f98] | 746 | } |
---|
| 747 | } |
---|
[a757ba1] | 748 | } |
---|
[1757f98] | 749 | |
---|
[a757ba1] | 750 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 751 | if(this->print_halts) { |
---|
| 752 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->unique_id, rdtscl()); |
---|
| 753 | } |
---|
[1757f98] | 754 | #endif |
---|
| 755 | } |
---|
| 756 | |
---|
[5f5a729] | 757 | static bool mark_idle(__cluster_proc_list & this, processor & proc) { |
---|
[c9c1c1c] | 758 | __STATS__(true, ready.sleep.halts++; ) |
---|
[7cf3b1d] | 759 | |
---|
[22226e4] | 760 | proc.idle_wctx.sem = 0; |
---|
[7cf3b1d] | 761 | |
---|
[8fc652e0] | 762 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[5f5a729] | 763 | if(!try_lock( this )) return false; |
---|
[1eb239e4] | 764 | this.idle++; |
---|
| 765 | /* paranoid */ verify( this.idle <= this.total ); |
---|
[fc59b580] | 766 | remove(proc); |
---|
[6a9b12b] | 767 | insert_first(this.idles, proc); |
---|
[34b8cb7] | 768 | |
---|
[a757ba1] | 769 | // update the pointer to the head wait context, which should now point to this proc. |
---|
[7cf3b1d] | 770 | __atomic_store_n(&this.fdw, &proc.idle_wctx, __ATOMIC_SEQ_CST); |
---|
[1eb239e4] | 771 | unlock( this ); |
---|
[8fc652e0] | 772 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[5f5a729] | 773 | |
---|
| 774 | return true; |
---|
[1eb239e4] | 775 | } |
---|
[8e16177] | 776 | |
---|
[6a9b12b] | 777 | static void mark_awake(__cluster_proc_list & this, processor & proc) { |
---|
[8fc652e0] | 778 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 779 | lock( this ); |
---|
| 780 | this.idle--; |
---|
| 781 | /* paranoid */ verify( this.idle >= 0 ); |
---|
| 782 | remove(proc); |
---|
[fc59b580] | 783 | insert_last(this.actives, proc); |
---|
[6a9b12b] | 784 | |
---|
[a633f6f] | 785 | { |
---|
[a757ba1] | 786 | // update the pointer to the head wait context |
---|
[7cf3b1d] | 787 | struct __fd_waitctx * wctx = 0; |
---|
| 788 | if(!this.idles`isEmpty) wctx = &this.idles`first.idle_wctx; |
---|
| 789 | __atomic_store_n(&this.fdw, wctx, __ATOMIC_SEQ_CST); |
---|
[a633f6f] | 790 | } |
---|
| 791 | |
---|
[34b8cb7] | 792 | unlock( this ); |
---|
[6a9b12b] | 793 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[6b4cdd3] | 794 | } |
---|
| 795 | |
---|
[dbe9b08] | 796 | //============================================================================================= |
---|
| 797 | // Unexpected Terminating logic |
---|
| 798 | //============================================================================================= |
---|
[92bfda0] | 799 | void __kernel_abort_msg( char * abort_text, int abort_text_size ) { |
---|
[e84ab3d] | 800 | thread$ * thrd = __cfaabi_tls.this_thread; |
---|
[9d944b2] | 801 | |
---|
[de94a60] | 802 | if(thrd) { |
---|
| 803 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[1c40091] | 804 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 805 | |
---|
[212c2187] | 806 | if ( &thrd->self_cor != thrd->curr_cor ) { |
---|
| 807 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor ); |
---|
[1c40091] | 808 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 809 | } |
---|
| 810 | else { |
---|
[1c40091] | 811 | __cfaabi_bits_write( STDERR_FILENO, ".\n", 2 ); |
---|
[de94a60] | 812 | } |
---|
[1c273d0] | 813 | } |
---|
[9d944b2] | 814 | else { |
---|
[de94a60] | 815 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
[1c40091] | 816 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[9d944b2] | 817 | } |
---|
| 818 | } |
---|
| 819 | |
---|
[92bfda0] | 820 | int __kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
| 821 | return get_coroutine(__cfaabi_tls.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
[2b8bc41] | 822 | } |
---|
| 823 | |
---|
[de94a60] | 824 | static __spinlock_t kernel_debug_lock; |
---|
| 825 | |
---|
[9d944b2] | 826 | extern "C" { |
---|
[1c40091] | 827 | void __cfaabi_bits_acquire() { |
---|
[36982fc] | 828 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 829 | } |
---|
| 830 | |
---|
[1c40091] | 831 | void __cfaabi_bits_release() { |
---|
[ea7d2b0] | 832 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 833 | } |
---|
[8118303] | 834 | } |
---|
| 835 | |
---|
[fa21ac9] | 836 | //============================================================================================= |
---|
| 837 | // Kernel Utilities |
---|
| 838 | //============================================================================================= |
---|
[dddb3dd0] | 839 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
| 840 | #include "io/types.hfa" |
---|
| 841 | #endif |
---|
| 842 | |
---|
[2026bb6] | 843 | //----------------------------------------------------------------------------- |
---|
| 844 | // Debug |
---|
[c18bf9e] | 845 | bool threading_enabled(void) __attribute__((const)) libcfa_public { |
---|
[2026bb6] | 846 | return true; |
---|
| 847 | } |
---|
[c34ebf2] | 848 | |
---|
| 849 | //----------------------------------------------------------------------------- |
---|
| 850 | // Statistics |
---|
| 851 | #if !defined(__CFA_NO_STATISTICS__) |
---|
[c18bf9e] | 852 | void print_halts( processor & this ) libcfa_public { |
---|
[c34ebf2] | 853 | this.print_halts = true; |
---|
| 854 | } |
---|
[58688bf] | 855 | |
---|
[69914cbc] | 856 | static void crawl_list( cluster * cltr, dlist(processor) & list, unsigned count ) { |
---|
[8464edf] | 857 | /* paranoid */ verify( cltr->stats ); |
---|
| 858 | |
---|
| 859 | processor * it = &list`first; |
---|
| 860 | for(unsigned i = 0; i < count; i++) { |
---|
| 861 | /* paranoid */ verifyf( it, "Unexpected null iterator, at index %u of %u\n", i, count); |
---|
| 862 | /* paranoid */ verify( it->local_data->this_stats ); |
---|
[c33c2af] | 863 | // __print_stats( it->local_data->this_stats, cltr->print_stats, "Processor", it->name, (void*)it ); |
---|
[8464edf] | 864 | __tally_stats( cltr->stats, it->local_data->this_stats ); |
---|
| 865 | it = &(*it)`next; |
---|
| 866 | } |
---|
| 867 | } |
---|
| 868 | |
---|
[c18bf9e] | 869 | static void crawl_cluster_stats( cluster & this ) { |
---|
[8464edf] | 870 | // Stop the world, otherwise stats could get really messed-up |
---|
| 871 | // this doesn't solve all problems but does solve many |
---|
| 872 | // so it's probably good enough |
---|
[c33c2af] | 873 | disable_interrupts(); |
---|
[8464edf] | 874 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
| 875 | |
---|
| 876 | crawl_list(&this, this.procs.actives, this.procs.total - this.procs.idle); |
---|
| 877 | crawl_list(&this, this.procs.idles , this.procs.idle ); |
---|
| 878 | |
---|
| 879 | // Unlock the RWlock |
---|
| 880 | ready_mutate_unlock( last_size ); |
---|
[c33c2af] | 881 | enable_interrupts(); |
---|
[8464edf] | 882 | } |
---|
| 883 | |
---|
| 884 | |
---|
[c18bf9e] | 885 | void print_stats_now( cluster & this, int flags ) libcfa_public { |
---|
[8464edf] | 886 | crawl_cluster_stats( this ); |
---|
[202c80b] | 887 | __print_stats( this.stats, flags, "Cluster", this.name, (void*)&this ); |
---|
[1b033b8] | 888 | } |
---|
[c34ebf2] | 889 | #endif |
---|
[8118303] | 890 | // Local Variables: // |
---|
| 891 | // mode: c // |
---|
| 892 | // tab-width: 4 // |
---|
| 893 | // End: // |
---|