[8118303] | 1 | // -*- Mode: CFA -*- |
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| 2 | // |
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| 3 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 4 | // |
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| 5 | // The contents of this file are covered under the licence agreement in the |
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| 6 | // file "LICENCE" distributed with Cforall. |
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| 7 | // |
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| 8 | // kernel.c -- |
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| 9 | // |
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| 10 | // Author : Thierry Delisle |
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[75f3522] | 11 | // Created On : Tue Jan 17 12:27:26 2017 |
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[8118303] | 12 | // Last Modified By : Thierry Delisle |
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| 13 | // Last Modified On : -- |
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| 14 | // Update Count : 0 |
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| 15 | // |
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| 16 | |
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[9d944b2] | 17 | #include "startup.h" |
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| 18 | |
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[0c92c9f] | 19 | //Start and stop routine for the kernel, declared first to make sure they run first |
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[9d944b2] | 20 | void kernel_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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| 21 | void kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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[0c92c9f] | 22 | |
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[8118303] | 23 | //Header |
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[75f3522] | 24 | #include "kernel_private.h" |
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[8118303] | 25 | |
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| 26 | //C Includes |
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[c84e80a] | 27 | #include <stddef.h> |
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[eb2e723] | 28 | extern "C" { |
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[9d944b2] | 29 | #include <stdio.h> |
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[8fcbb4c] | 30 | #include <fenv.h> |
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[eb2e723] | 31 | #include <sys/resource.h> |
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[9d944b2] | 32 | #include <signal.h> |
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| 33 | #include <unistd.h> |
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[eb2e723] | 34 | } |
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[8118303] | 35 | |
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| 36 | //CFA Includes |
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| 37 | #include "libhdr.h" |
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| 38 | |
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| 39 | //Private includes |
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| 40 | #define __CFA_INVOKE_PRIVATE__ |
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| 41 | #include "invoke.h" |
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| 42 | |
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[8def349] | 43 | //----------------------------------------------------------------------------- |
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| 44 | // Kernel storage |
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| 45 | #define KERNEL_STORAGE(T,X) static char X##_storage[sizeof(T)] |
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| 46 | |
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| 47 | KERNEL_STORAGE(processorCtx_t, systemProcessorCtx); |
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| 48 | KERNEL_STORAGE(cluster, systemCluster); |
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| 49 | KERNEL_STORAGE(processor, systemProcessor); |
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[348006f] | 50 | KERNEL_STORAGE(thread_desc, mainThread); |
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[8def349] | 51 | KERNEL_STORAGE(machine_context_t, mainThread_context); |
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| 52 | |
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[bd98b58] | 53 | cluster * systemCluster; |
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[eb2e723] | 54 | processor * systemProcessor; |
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[348006f] | 55 | thread_desc * mainThread; |
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[eb2e723] | 56 | |
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[bd98b58] | 57 | //----------------------------------------------------------------------------- |
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| 58 | // Global state |
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| 59 | |
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[8def349] | 60 | thread_local processor * this_processor; |
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| 61 | |
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[c3acb841] | 62 | coroutine_desc * this_coroutine(void) { |
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[bd98b58] | 63 | return this_processor->current_coroutine; |
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| 64 | } |
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| 65 | |
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[348006f] | 66 | thread_desc * this_thread(void) { |
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[bd98b58] | 67 | return this_processor->current_thread; |
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[c84e80a] | 68 | } |
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| 69 | |
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| 70 | //----------------------------------------------------------------------------- |
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[8def349] | 71 | // Main thread construction |
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| 72 | struct current_stack_info_t { |
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| 73 | machine_context_t ctx; |
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| 74 | unsigned int size; // size of stack |
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| 75 | void *base; // base of stack |
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| 76 | void *storage; // pointer to stack |
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| 77 | void *limit; // stack grows towards stack limit |
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| 78 | void *context; // address of cfa_context_t |
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| 79 | void *top; // address of top of storage |
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[c84e80a] | 80 | }; |
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| 81 | |
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[8def349] | 82 | void ?{}( current_stack_info_t * this ) { |
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| 83 | CtxGet( &this->ctx ); |
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| 84 | this->base = this->ctx.FP; |
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| 85 | this->storage = this->ctx.SP; |
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| 86 | |
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| 87 | rlimit r; |
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[132fad4] | 88 | getrlimit( RLIMIT_STACK, &r); |
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[8def349] | 89 | this->size = r.rlim_cur; |
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| 90 | |
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| 91 | this->limit = (void *)(((intptr_t)this->base) - this->size); |
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| 92 | this->context = &mainThread_context_storage; |
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| 93 | this->top = this->base; |
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| 94 | } |
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| 95 | |
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| 96 | void ?{}( coStack_t * this, current_stack_info_t * info) { |
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| 97 | this->size = info->size; |
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| 98 | this->storage = info->storage; |
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| 99 | this->limit = info->limit; |
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| 100 | this->base = info->base; |
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| 101 | this->context = info->context; |
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| 102 | this->top = info->top; |
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| 103 | this->userStack = true; |
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| 104 | } |
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| 105 | |
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[c3acb841] | 106 | void ?{}( coroutine_desc * this, current_stack_info_t * info) { |
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[8def349] | 107 | (&this->stack){ info }; |
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| 108 | this->name = "Main Thread"; |
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| 109 | this->errno_ = 0; |
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[ee897e4b] | 110 | this->state = Start; |
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[8def349] | 111 | } |
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| 112 | |
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[348006f] | 113 | void ?{}( thread_desc * this, current_stack_info_t * info) { |
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[17af7d1] | 114 | (&this->cor){ info }; |
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[8def349] | 115 | } |
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[c84e80a] | 116 | |
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[8def349] | 117 | //----------------------------------------------------------------------------- |
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| 118 | // Processor coroutine |
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[eb2e723] | 119 | void ?{}(processorCtx_t * this, processor * proc) { |
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[17af7d1] | 120 | (&this->__cor){}; |
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[c84e80a] | 121 | this->proc = proc; |
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[8fcbb4c] | 122 | proc->runner = this; |
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[8def349] | 123 | } |
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| 124 | |
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| 125 | void ?{}(processorCtx_t * this, processor * proc, current_stack_info_t * info) { |
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[17af7d1] | 126 | (&this->__cor){ info }; |
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[8def349] | 127 | this->proc = proc; |
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[8fcbb4c] | 128 | proc->runner = this; |
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[8def349] | 129 | } |
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| 130 | |
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| 131 | void ?{}(processor * this) { |
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| 132 | this{ systemCluster }; |
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| 133 | } |
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| 134 | |
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| 135 | void ?{}(processor * this, cluster * cltr) { |
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| 136 | this->cltr = cltr; |
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| 137 | this->current_coroutine = NULL; |
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| 138 | this->current_thread = NULL; |
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[db6f06a] | 139 | (&this->terminated){}; |
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| 140 | this->is_terminated = false; |
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[8def349] | 141 | |
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| 142 | start( this ); |
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[c84e80a] | 143 | } |
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| 144 | |
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[8fcbb4c] | 145 | void ?{}(processor * this, cluster * cltr, processorCtx_t * runner) { |
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[8def349] | 146 | this->cltr = cltr; |
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| 147 | this->current_coroutine = NULL; |
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| 148 | this->current_thread = NULL; |
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[db6f06a] | 149 | (&this->terminated){}; |
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| 150 | this->is_terminated = false; |
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[8def349] | 151 | |
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[8fcbb4c] | 152 | this->runner = runner; |
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[9d944b2] | 153 | LIB_DEBUG_PRINT_SAFE("Kernel : constructing processor context %p\n", runner); |
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[8fcbb4c] | 154 | runner{ this }; |
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[8def349] | 155 | } |
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| 156 | |
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| 157 | void ^?{}(processor * this) { |
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[db6f06a] | 158 | if( ! this->is_terminated ) { |
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[9d944b2] | 159 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p signaling termination\n", this); |
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[db6f06a] | 160 | this->is_terminated = true; |
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| 161 | wait( &this->terminated ); |
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[8def349] | 162 | } |
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| 163 | } |
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| 164 | |
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| 165 | void ?{}(cluster * this) { |
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| 166 | ( &this->ready_queue ){}; |
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[eafb094] | 167 | ( &this->lock ){}; |
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[8def349] | 168 | } |
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| 169 | |
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| 170 | void ^?{}(cluster * this) { |
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[8fcbb4c] | 171 | |
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[c84e80a] | 172 | } |
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| 173 | |
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[75f3522] | 174 | //============================================================================================= |
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| 175 | // Kernel Scheduling logic |
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| 176 | //============================================================================================= |
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[8fcbb4c] | 177 | //Main of the processor contexts |
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| 178 | void main(processorCtx_t * runner) { |
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| 179 | processor * this = runner->proc; |
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[9d944b2] | 180 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p starting\n", this); |
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[8118303] | 181 | |
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[348006f] | 182 | thread_desc * readyThread = NULL; |
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[db6f06a] | 183 | for( unsigned int spin_count = 0; ! this->is_terminated; spin_count++ ) |
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[75f3522] | 184 | { |
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[bd98b58] | 185 | readyThread = nextThread( this->cltr ); |
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[8118303] | 186 | |
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[75f3522] | 187 | if(readyThread) |
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| 188 | { |
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| 189 | runThread(this, readyThread); |
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| 190 | |
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| 191 | //Some actions need to be taken from the kernel |
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[db6f06a] | 192 | finishRunning(this); |
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[75f3522] | 193 | |
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[c84e80a] | 194 | spin_count = 0; |
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[75f3522] | 195 | } |
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| 196 | else |
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| 197 | { |
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[c84e80a] | 198 | spin(this, &spin_count); |
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| 199 | } |
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| 200 | } |
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[8118303] | 201 | |
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[9d944b2] | 202 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p unlocking thread\n", this); |
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[db6f06a] | 203 | signal( &this->terminated ); |
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[9d944b2] | 204 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p terminated\n", this); |
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[c84e80a] | 205 | } |
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| 206 | |
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[75f3522] | 207 | // runThread runs a thread by context switching |
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[0c92c9f] | 208 | // from the processor coroutine to the target thread |
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[348006f] | 209 | void runThread(processor * this, thread_desc * dst) { |
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[c3acb841] | 210 | coroutine_desc * proc_cor = get_coroutine(this->runner); |
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| 211 | coroutine_desc * thrd_cor = get_coroutine(dst); |
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[75f3522] | 212 | |
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| 213 | //Reset the terminating actions here |
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[db6f06a] | 214 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 215 | |
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[75f3522] | 216 | //Update global state |
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| 217 | this->current_thread = dst; |
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| 218 | |
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| 219 | // Context Switch to the thread |
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| 220 | ThreadCtxSwitch(proc_cor, thrd_cor); |
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| 221 | // when ThreadCtxSwitch returns we are back in the processor coroutine |
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| 222 | } |
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| 223 | |
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| 224 | // Once a thread has finished running, some of |
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| 225 | // its final actions must be executed from the kernel |
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[db6f06a] | 226 | void finishRunning(processor * this) { |
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| 227 | if( this->finish.action_code == Release ) { |
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| 228 | unlock( this->finish.lock ); |
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| 229 | } |
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| 230 | else if( this->finish.action_code == Schedule ) { |
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| 231 | ScheduleThread( this->finish.thrd ); |
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| 232 | } |
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| 233 | else if( this->finish.action_code == Release_Schedule ) { |
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| 234 | unlock( this->finish.lock ); |
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| 235 | ScheduleThread( this->finish.thrd ); |
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| 236 | } |
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| 237 | else { |
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| 238 | assert(this->finish.action_code == No_Action); |
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[8fcbb4c] | 239 | } |
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[c84e80a] | 240 | } |
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| 241 | |
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[0c92c9f] | 242 | // Handles spinning logic |
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| 243 | // TODO : find some strategy to put cores to sleep after some time |
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[c84e80a] | 244 | void spin(processor * this, unsigned int * spin_count) { |
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| 245 | (*spin_count)++; |
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| 246 | } |
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| 247 | |
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[0c92c9f] | 248 | // Context invoker for processors |
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| 249 | // This is the entry point for processors (kernel threads) |
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| 250 | // It effectively constructs a coroutine by stealing the pthread stack |
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[8def349] | 251 | void * CtxInvokeProcessor(void * arg) { |
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| 252 | processor * proc = (processor *) arg; |
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| 253 | this_processor = proc; |
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| 254 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 255 | // which is needed for the 2-step context switch. However, there is no reason |
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| 256 | // to waste the perfectly valid stack create by pthread. |
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| 257 | current_stack_info_t info; |
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| 258 | machine_context_t ctx; |
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| 259 | info.context = &ctx; |
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| 260 | processorCtx_t proc_cor_storage = { proc, &info }; |
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| 261 | |
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[9d944b2] | 262 | LIB_DEBUG_PRINT_SAFE("Coroutine : created stack %p\n", proc_cor_storage.__cor.stack.base); |
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[8fcbb4c] | 263 | |
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[0c92c9f] | 264 | //Set global state |
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[17af7d1] | 265 | proc->current_coroutine = &proc->runner->__cor; |
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[8def349] | 266 | proc->current_thread = NULL; |
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| 267 | |
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| 268 | //We now have a proper context from which to schedule threads |
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[9d944b2] | 269 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p created (%p, %p)\n", proc, proc->runner, &ctx); |
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[8def349] | 270 | |
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| 271 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 272 | // resume it to start it like it normally would, it will just context switch |
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| 273 | // back to here. Instead directly call the main since we already are on the |
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| 274 | // appropriate stack. |
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[17af7d1] | 275 | proc_cor_storage.__cor.state = Active; |
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[8def349] | 276 | main( &proc_cor_storage ); |
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[17af7d1] | 277 | proc_cor_storage.__cor.state = Halted; |
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[8def349] | 278 | |
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[0c92c9f] | 279 | // Main routine of the core returned, the core is now fully terminated |
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[9d944b2] | 280 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p main ended (%p)\n", proc, proc->runner); |
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[8def349] | 281 | |
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| 282 | return NULL; |
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[c84e80a] | 283 | } |
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| 284 | |
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[8def349] | 285 | void start(processor * this) { |
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[9d944b2] | 286 | LIB_DEBUG_PRINT_SAFE("Kernel : Starting core %p\n", this); |
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[8def349] | 287 | |
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[8fcbb4c] | 288 | // pthread_attr_t attributes; |
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| 289 | // pthread_attr_init( &attributes ); |
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[eb2e723] | 290 | |
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[8fcbb4c] | 291 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
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[eb2e723] | 292 | |
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[8fcbb4c] | 293 | // pthread_attr_destroy( &attributes ); |
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[eb2e723] | 294 | |
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[9d944b2] | 295 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p started\n", this); |
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[eb2e723] | 296 | } |
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| 297 | |
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[8def349] | 298 | //----------------------------------------------------------------------------- |
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| 299 | // Scheduler routines |
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[348006f] | 300 | void ScheduleThread( thread_desc * thrd ) { |
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[8def349] | 301 | assertf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
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| 302 | |
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[db6f06a] | 303 | lock( &systemProcessor->cltr->lock ); |
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[8def349] | 304 | append( &systemProcessor->cltr->ready_queue, thrd ); |
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[db6f06a] | 305 | unlock( &systemProcessor->cltr->lock ); |
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| 306 | } |
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| 307 | |
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[348006f] | 308 | thread_desc * nextThread(cluster * this) { |
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[db6f06a] | 309 | lock( &this->lock ); |
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[348006f] | 310 | thread_desc * head = pop_head( &this->ready_queue ); |
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[db6f06a] | 311 | unlock( &this->lock ); |
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| 312 | return head; |
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[eb2e723] | 313 | } |
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| 314 | |
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[75f3522] | 315 | void ScheduleInternal() { |
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| 316 | suspend(); |
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| 317 | } |
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| 318 | |
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[db6f06a] | 319 | void ScheduleInternal( spinlock * lock ) { |
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[89a3df5] | 320 | this_processor->finish.action_code = Release; |
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| 321 | this_processor->finish.lock = lock; |
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[db6f06a] | 322 | suspend(); |
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| 323 | } |
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| 324 | |
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[348006f] | 325 | void ScheduleInternal( thread_desc * thrd ) { |
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[89a3df5] | 326 | this_processor->finish.action_code = Schedule; |
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| 327 | this_processor->finish.thrd = thrd; |
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[db6f06a] | 328 | suspend(); |
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| 329 | } |
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| 330 | |
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[348006f] | 331 | void ScheduleInternal( spinlock * lock, thread_desc * thrd ) { |
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[89a3df5] | 332 | this_processor->finish.action_code = Release_Schedule; |
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| 333 | this_processor->finish.lock = lock; |
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| 334 | this_processor->finish.thrd = thrd; |
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[db6f06a] | 335 | suspend(); |
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[eb2e723] | 336 | } |
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| 337 | |
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| 338 | //----------------------------------------------------------------------------- |
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| 339 | // Kernel boot procedures |
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| 340 | void kernel_startup(void) { |
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[9d944b2] | 341 | LIB_DEBUG_PRINT_SAFE("Kernel : Starting\n"); |
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[eb2e723] | 342 | |
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| 343 | // Start by initializing the main thread |
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[8fcbb4c] | 344 | // SKULLDUGGERY: the mainThread steals the process main thread |
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| 345 | // which will then be scheduled by the systemProcessor normally |
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[348006f] | 346 | mainThread = (thread_desc *)&mainThread_storage; |
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[8fcbb4c] | 347 | current_stack_info_t info; |
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[8def349] | 348 | mainThread{ &info }; |
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[eb2e723] | 349 | |
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[bd98b58] | 350 | // Initialize the system cluster |
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| 351 | systemCluster = (cluster *)&systemCluster_storage; |
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| 352 | systemCluster{}; |
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| 353 | |
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[8def349] | 354 | // Initialize the system processor and the system processor ctx |
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[eb2e723] | 355 | // (the coroutine that contains the processing control flow) |
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[8def349] | 356 | systemProcessor = (processor *)&systemProcessor_storage; |
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| 357 | systemProcessor{ systemCluster, (processorCtx_t *)&systemProcessorCtx_storage }; |
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[eb2e723] | 358 | |
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[dcb42b8] | 359 | // Add the main thread to the ready queue |
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| 360 | // once resume is called on systemProcessor->ctx the mainThread needs to be scheduled like any normal thread |
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[75f3522] | 361 | ScheduleThread(mainThread); |
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[eb2e723] | 362 | |
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[dcb42b8] | 363 | //initialize the global state variables |
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[bd98b58] | 364 | this_processor = systemProcessor; |
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| 365 | this_processor->current_thread = mainThread; |
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[17af7d1] | 366 | this_processor->current_coroutine = &mainThread->cor; |
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[eb2e723] | 367 | |
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[dcb42b8] | 368 | // SKULLDUGGERY: Force a context switch to the system processor to set the main thread's context to the current UNIX |
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| 369 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
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| 370 | // mainThread is on the ready queue when this call is made. |
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[8fcbb4c] | 371 | resume(systemProcessor->runner); |
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[eb2e723] | 372 | |
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[dcb42b8] | 373 | |
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| 374 | |
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| 375 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
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[9d944b2] | 376 | LIB_DEBUG_PRINT_SAFE("Kernel : Started\n--------------------------------------------------\n\n"); |
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[eb2e723] | 377 | } |
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| 378 | |
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[dcb42b8] | 379 | void kernel_shutdown(void) { |
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[9d944b2] | 380 | LIB_DEBUG_PRINT_SAFE("\n--------------------------------------------------\nKernel : Shutting down\n"); |
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[eb2e723] | 381 | |
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[dcb42b8] | 382 | // SKULLDUGGERY: Notify the systemProcessor it needs to terminates. |
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| 383 | // When its coroutine terminates, it return control to the mainThread |
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| 384 | // which is currently here |
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[db6f06a] | 385 | systemProcessor->is_terminated = true; |
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[eb2e723] | 386 | suspend(); |
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| 387 | |
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[dcb42b8] | 388 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
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[eb2e723] | 389 | |
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[dcb42b8] | 390 | // Destroy the system processor and its context in reverse order of construction |
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| 391 | // These were manually constructed so we need manually destroy them |
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[8fcbb4c] | 392 | ^(systemProcessor->runner){}; |
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[eb2e723] | 393 | ^(systemProcessor){}; |
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| 394 | |
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[dcb42b8] | 395 | // Final step, destroy the main thread since it is no longer needed |
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| 396 | // Since we provided a stack to this taxk it will not destroy anything |
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[eb2e723] | 397 | ^(mainThread){}; |
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| 398 | |
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[9d944b2] | 399 | LIB_DEBUG_PRINT_SAFE("Kernel : Shutdown complete\n"); |
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| 400 | } |
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| 401 | |
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| 402 | static spinlock kernel_abort_lock; |
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| 403 | static spinlock kernel_debug_lock; |
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| 404 | static bool kernel_abort_called = false; |
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| 405 | |
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| 406 | void * kernel_abort (void) __attribute__ ((__nothrow__)) { |
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| 407 | // abort cannot be recursively entered by the same or different processors because all signal handlers return when |
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| 408 | // the globalAbort flag is true. |
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| 409 | lock( &kernel_abort_lock ); |
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| 410 | |
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| 411 | // first task to abort ? |
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| 412 | if ( !kernel_abort_called ) { // not first task to abort ? |
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| 413 | kernel_abort_called = true; |
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| 414 | unlock( &kernel_abort_lock ); |
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| 415 | } |
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| 416 | else { |
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| 417 | unlock( &kernel_abort_lock ); |
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| 418 | |
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| 419 | sigset_t mask; |
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| 420 | sigemptyset( &mask ); |
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| 421 | sigaddset( &mask, SIGALRM ); // block SIGALRM signals |
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| 422 | sigaddset( &mask, SIGUSR1 ); // block SIGUSR1 signals |
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| 423 | sigsuspend( &mask ); // block the processor to prevent further damage during abort |
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| 424 | _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it |
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| 425 | } |
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| 426 | |
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| 427 | return this_thread(); |
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| 428 | } |
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| 429 | |
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| 430 | void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) { |
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| 431 | thread_desc * thrd = kernel_data; |
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| 432 | |
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| 433 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing task %.256s (%p)", thrd->cor.name, thrd ); |
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| 434 | __lib_debug_write( STDERR_FILENO, abort_text, len ); |
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| 435 | |
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| 436 | if ( thrd != this_coroutine() ) { |
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| 437 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", this_coroutine()->name, this_coroutine() ); |
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| 438 | __lib_debug_write( STDERR_FILENO, abort_text, len ); |
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| 439 | } |
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| 440 | else { |
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| 441 | __lib_debug_write( STDERR_FILENO, ".\n", 2 ); |
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| 442 | } |
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| 443 | } |
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| 444 | |
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| 445 | extern "C" { |
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| 446 | void __lib_debug_acquire() { |
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| 447 | lock(&kernel_debug_lock); |
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| 448 | } |
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| 449 | |
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| 450 | void __lib_debug_release() { |
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| 451 | unlock(&kernel_debug_lock); |
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| 452 | } |
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[8118303] | 453 | } |
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| 454 | |
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[bd98b58] | 455 | //----------------------------------------------------------------------------- |
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| 456 | // Locks |
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[db6f06a] | 457 | void ?{}( spinlock * this ) { |
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| 458 | this->lock = 0; |
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[bd98b58] | 459 | } |
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[db6f06a] | 460 | void ^?{}( spinlock * this ) { |
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[bd98b58] | 461 | |
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[db6f06a] | 462 | } |
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| 463 | |
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| 464 | void lock( spinlock * this ) { |
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| 465 | for ( unsigned int i = 1;; i += 1 ) { |
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| 466 | if ( this->lock == 0 && __sync_lock_test_and_set_4( &this->lock, 1 ) == 0 ) break; |
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| 467 | } |
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| 468 | } |
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[bd98b58] | 469 | |
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[db6f06a] | 470 | void unlock( spinlock * this ) { |
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| 471 | __sync_lock_release_4( &this->lock ); |
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[bd98b58] | 472 | } |
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| 473 | |
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[db6f06a] | 474 | void ?{}( signal_once * this ) { |
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| 475 | this->condition = false; |
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| 476 | } |
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| 477 | void ^?{}( signal_once * this ) { |
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| 478 | |
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| 479 | } |
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| 480 | |
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| 481 | void wait( signal_once * this ) { |
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| 482 | lock( &this->lock ); |
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| 483 | if( !this->condition ) { |
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[8def349] | 484 | append( &this->blocked, this_thread() ); |
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[db6f06a] | 485 | ScheduleInternal( &this->lock ); |
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| 486 | lock( &this->lock ); |
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[8def349] | 487 | } |
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[db6f06a] | 488 | unlock( &this->lock ); |
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[bd98b58] | 489 | } |
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| 490 | |
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[db6f06a] | 491 | void signal( signal_once * this ) { |
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| 492 | lock( &this->lock ); |
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| 493 | { |
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| 494 | this->condition = true; |
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| 495 | |
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[348006f] | 496 | thread_desc * it; |
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[db6f06a] | 497 | while( it = pop_head( &this->blocked) ) { |
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| 498 | ScheduleThread( it ); |
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| 499 | } |
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[bd98b58] | 500 | } |
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[db6f06a] | 501 | unlock( &this->lock ); |
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[bd98b58] | 502 | } |
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| 503 | |
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| 504 | //----------------------------------------------------------------------------- |
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| 505 | // Queues |
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| 506 | void ?{}( simple_thread_list * this ) { |
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| 507 | this->head = NULL; |
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| 508 | this->tail = &this->head; |
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| 509 | } |
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| 510 | |
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[348006f] | 511 | void append( simple_thread_list * this, thread_desc * t ) { |
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[f07e037] | 512 | assert(this->tail != NULL); |
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[bd98b58] | 513 | *this->tail = t; |
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| 514 | this->tail = &t->next; |
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| 515 | } |
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| 516 | |
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[348006f] | 517 | thread_desc * pop_head( simple_thread_list * this ) { |
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| 518 | thread_desc * head = this->head; |
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[bd98b58] | 519 | if( head ) { |
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| 520 | this->head = head->next; |
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| 521 | if( !head->next ) { |
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| 522 | this->tail = &this->head; |
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| 523 | } |
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| 524 | head->next = NULL; |
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| 525 | } |
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| 526 | return head; |
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| 527 | } |
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[8118303] | 528 | // Local Variables: // |
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| 529 | // mode: c // |
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| 530 | // tab-width: 4 // |
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| 531 | // End: // |
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