[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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[2ac095d] | 17 | #include "libhdr.h" |
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[8118303] | 18 | |
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| 19 | //C Includes |
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[c84e80a] | 20 | #include <stddef.h> |
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[eb2e723] | 21 | extern "C" { |
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[9d944b2] | 22 | #include <stdio.h> |
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[8fcbb4c] | 23 | #include <fenv.h> |
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[eb2e723] | 24 | #include <sys/resource.h> |
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[9d944b2] | 25 | #include <signal.h> |
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| 26 | #include <unistd.h> |
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[eb2e723] | 27 | } |
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[8118303] | 28 | |
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| 29 | //CFA Includes |
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[2ac095d] | 30 | #include "kernel_private.h" |
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[c81ebf9] | 31 | #include "preemption.h" |
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[2ac095d] | 32 | #include "startup.h" |
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[8118303] | 33 | |
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| 34 | //Private includes |
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| 35 | #define __CFA_INVOKE_PRIVATE__ |
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| 36 | #include "invoke.h" |
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| 37 | |
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[2ac095d] | 38 | //Start and stop routine for the kernel, declared first to make sure they run first |
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| 39 | void kernel_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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| 40 | void kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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| 41 | |
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[8def349] | 42 | //----------------------------------------------------------------------------- |
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| 43 | // Kernel storage |
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| 44 | #define KERNEL_STORAGE(T,X) static char X##_storage[sizeof(T)] |
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| 45 | |
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| 46 | KERNEL_STORAGE(processorCtx_t, systemProcessorCtx); |
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| 47 | KERNEL_STORAGE(cluster, systemCluster); |
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[fa21ac9] | 48 | KERNEL_STORAGE(system_proc_t, systemProcessor); |
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[348006f] | 49 | KERNEL_STORAGE(thread_desc, mainThread); |
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[8def349] | 50 | KERNEL_STORAGE(machine_context_t, mainThread_context); |
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| 51 | |
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[bd98b58] | 52 | cluster * systemCluster; |
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[fa21ac9] | 53 | system_proc_t * systemProcessor; |
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[348006f] | 54 | thread_desc * mainThread; |
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[eb2e723] | 55 | |
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[bd98b58] | 56 | //----------------------------------------------------------------------------- |
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| 57 | // Global state |
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| 58 | |
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[4e6fb8e] | 59 | volatile thread_local processor * this_processor; |
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[1c273d0] | 60 | volatile thread_local coroutine_desc * this_coroutine; |
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| 61 | volatile thread_local thread_desc * this_thread; |
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| 62 | volatile thread_local unsigned short disable_preempt_count = 1; |
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[c84e80a] | 63 | |
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| 64 | //----------------------------------------------------------------------------- |
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[8def349] | 65 | // Main thread construction |
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| 66 | struct current_stack_info_t { |
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[1c273d0] | 67 | machine_context_t ctx; |
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[8def349] | 68 | unsigned int size; // size of stack |
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| 69 | void *base; // base of stack |
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| 70 | void *storage; // pointer to stack |
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| 71 | void *limit; // stack grows towards stack limit |
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| 72 | void *context; // address of cfa_context_t |
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| 73 | void *top; // address of top of storage |
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[c84e80a] | 74 | }; |
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| 75 | |
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[8def349] | 76 | void ?{}( current_stack_info_t * this ) { |
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| 77 | CtxGet( &this->ctx ); |
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| 78 | this->base = this->ctx.FP; |
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| 79 | this->storage = this->ctx.SP; |
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| 80 | |
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| 81 | rlimit r; |
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[132fad4] | 82 | getrlimit( RLIMIT_STACK, &r); |
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[8def349] | 83 | this->size = r.rlim_cur; |
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| 84 | |
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| 85 | this->limit = (void *)(((intptr_t)this->base) - this->size); |
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| 86 | this->context = &mainThread_context_storage; |
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| 87 | this->top = this->base; |
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| 88 | } |
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| 89 | |
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| 90 | void ?{}( coStack_t * this, current_stack_info_t * info) { |
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| 91 | this->size = info->size; |
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| 92 | this->storage = info->storage; |
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| 93 | this->limit = info->limit; |
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| 94 | this->base = info->base; |
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| 95 | this->context = info->context; |
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| 96 | this->top = info->top; |
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| 97 | this->userStack = true; |
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| 98 | } |
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| 99 | |
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[c3acb841] | 100 | void ?{}( coroutine_desc * this, current_stack_info_t * info) { |
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[1c273d0] | 101 | (&this->stack){ info }; |
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[8def349] | 102 | this->name = "Main Thread"; |
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| 103 | this->errno_ = 0; |
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[ee897e4b] | 104 | this->state = Start; |
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[8def349] | 105 | } |
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| 106 | |
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[348006f] | 107 | void ?{}( thread_desc * this, current_stack_info_t * info) { |
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[17af7d1] | 108 | (&this->cor){ info }; |
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[8def349] | 109 | } |
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[c84e80a] | 110 | |
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[8def349] | 111 | //----------------------------------------------------------------------------- |
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| 112 | // Processor coroutine |
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[eb2e723] | 113 | void ?{}(processorCtx_t * this, processor * proc) { |
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[fa21ac9] | 114 | (&this->__cor){ "Processor" }; |
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[c84e80a] | 115 | this->proc = proc; |
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[8fcbb4c] | 116 | proc->runner = this; |
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[8def349] | 117 | } |
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| 118 | |
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| 119 | void ?{}(processorCtx_t * this, processor * proc, current_stack_info_t * info) { |
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[17af7d1] | 120 | (&this->__cor){ info }; |
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[8def349] | 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 ?{}(processor * this) { |
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| 126 | this{ systemCluster }; |
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| 127 | } |
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| 128 | |
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| 129 | void ?{}(processor * this, cluster * cltr) { |
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| 130 | this->cltr = cltr; |
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[db6f06a] | 131 | (&this->terminated){}; |
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| 132 | this->is_terminated = false; |
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[c81ebf9] | 133 | this->preemption_alarm = NULL; |
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| 134 | this->preemption = default_preemption(); |
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| 135 | this->pending_preemption = false; |
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[8def349] | 136 | |
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| 137 | start( this ); |
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[c84e80a] | 138 | } |
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| 139 | |
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[8fcbb4c] | 140 | void ?{}(processor * this, cluster * cltr, processorCtx_t * runner) { |
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[8def349] | 141 | this->cltr = cltr; |
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[db6f06a] | 142 | (&this->terminated){}; |
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| 143 | this->is_terminated = false; |
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[82ff5845] | 144 | this->preemption_alarm = NULL; |
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| 145 | this->preemption = default_preemption(); |
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[c81ebf9] | 146 | this->pending_preemption = false; |
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[82ff5845] | 147 | this->kernel_thread = pthread_self(); |
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[8def349] | 148 | |
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[8fcbb4c] | 149 | this->runner = runner; |
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[82ff5845] | 150 | LIB_DEBUG_PRINT_SAFE("Kernel : constructing system processor context %p\n", runner); |
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[8fcbb4c] | 151 | runner{ this }; |
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[8def349] | 152 | } |
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| 153 | |
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[4e6fb8e] | 154 | LIB_DEBUG_DO( bool validate( alarm_list_t * this ); ) |
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| 155 | |
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[fa21ac9] | 156 | void ?{}(system_proc_t * this, cluster * cltr, processorCtx_t * runner) { |
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| 157 | (&this->alarms){}; |
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| 158 | (&this->alarm_lock){}; |
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[c81ebf9] | 159 | this->pending_alarm = false; |
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[fa21ac9] | 160 | |
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| 161 | (&this->proc){ cltr, runner }; |
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[4e6fb8e] | 162 | |
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[0b33412] | 163 | verify( validate( &this->alarms ) ); |
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[fa21ac9] | 164 | } |
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| 165 | |
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[8def349] | 166 | void ^?{}(processor * this) { |
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[db6f06a] | 167 | if( ! this->is_terminated ) { |
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[9d944b2] | 168 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p signaling termination\n", this); |
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[db6f06a] | 169 | this->is_terminated = true; |
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| 170 | wait( &this->terminated ); |
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[8def349] | 171 | } |
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| 172 | } |
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| 173 | |
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| 174 | void ?{}(cluster * this) { |
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| 175 | ( &this->ready_queue ){}; |
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[eafb094] | 176 | ( &this->lock ){}; |
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[8def349] | 177 | } |
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| 178 | |
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| 179 | void ^?{}(cluster * this) { |
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[1c273d0] | 180 | |
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[c84e80a] | 181 | } |
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| 182 | |
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[75f3522] | 183 | //============================================================================================= |
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| 184 | // Kernel Scheduling logic |
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| 185 | //============================================================================================= |
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[8fcbb4c] | 186 | //Main of the processor contexts |
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| 187 | void main(processorCtx_t * runner) { |
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| 188 | processor * this = runner->proc; |
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[c81ebf9] | 189 | |
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[9d944b2] | 190 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p starting\n", this); |
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[8118303] | 191 | |
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[75f3522] | 192 | { |
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[c81ebf9] | 193 | // Setup preemption data |
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| 194 | preemption_scope scope = { this }; |
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| 195 | |
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| 196 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p started\n", this); |
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[8118303] | 197 | |
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[c81ebf9] | 198 | thread_desc * readyThread = NULL; |
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[1c273d0] | 199 | for( unsigned int spin_count = 0; ! this->is_terminated; spin_count++ ) |
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[75f3522] | 200 | { |
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[c81ebf9] | 201 | readyThread = nextThread( this->cltr ); |
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[75f3522] | 202 | |
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[c81ebf9] | 203 | if(readyThread) |
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| 204 | { |
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[0b33412] | 205 | verify( disable_preempt_count > 0 ); |
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[4e6fb8e] | 206 | |
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[c81ebf9] | 207 | runThread(this, readyThread); |
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[75f3522] | 208 | |
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[0b33412] | 209 | verify( disable_preempt_count > 0 ); |
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[4e6fb8e] | 210 | |
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[c81ebf9] | 211 | //Some actions need to be taken from the kernel |
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| 212 | finishRunning(this); |
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| 213 | |
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| 214 | spin_count = 0; |
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| 215 | } |
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| 216 | else |
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| 217 | { |
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| 218 | spin(this, &spin_count); |
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| 219 | } |
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| 220 | } |
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| 221 | |
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| 222 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p stopping\n", this); |
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[c84e80a] | 223 | } |
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[8118303] | 224 | |
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[db6f06a] | 225 | signal( &this->terminated ); |
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[9d944b2] | 226 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p terminated\n", this); |
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[c84e80a] | 227 | } |
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| 228 | |
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[1c273d0] | 229 | // runThread runs a thread by context switching |
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| 230 | // from the processor coroutine to the target thread |
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[348006f] | 231 | void runThread(processor * this, thread_desc * dst) { |
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[c3acb841] | 232 | coroutine_desc * proc_cor = get_coroutine(this->runner); |
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| 233 | coroutine_desc * thrd_cor = get_coroutine(dst); |
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[1c273d0] | 234 | |
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[75f3522] | 235 | //Reset the terminating actions here |
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[db6f06a] | 236 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 237 | |
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[75f3522] | 238 | //Update global state |
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[1c273d0] | 239 | this_thread = dst; |
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[75f3522] | 240 | |
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| 241 | // Context Switch to the thread |
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| 242 | ThreadCtxSwitch(proc_cor, thrd_cor); |
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| 243 | // when ThreadCtxSwitch returns we are back in the processor coroutine |
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| 244 | } |
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| 245 | |
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[1c273d0] | 246 | // Once a thread has finished running, some of |
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[75f3522] | 247 | // its final actions must be executed from the kernel |
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[db6f06a] | 248 | void finishRunning(processor * this) { |
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| 249 | if( this->finish.action_code == Release ) { |
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| 250 | unlock( this->finish.lock ); |
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| 251 | } |
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| 252 | else if( this->finish.action_code == Schedule ) { |
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| 253 | ScheduleThread( this->finish.thrd ); |
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| 254 | } |
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| 255 | else if( this->finish.action_code == Release_Schedule ) { |
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[1c273d0] | 256 | unlock( this->finish.lock ); |
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[db6f06a] | 257 | ScheduleThread( this->finish.thrd ); |
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| 258 | } |
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[0c78741] | 259 | else if( this->finish.action_code == Release_Multi ) { |
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| 260 | for(int i = 0; i < this->finish.lock_count; i++) { |
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| 261 | unlock( this->finish.locks[i] ); |
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| 262 | } |
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| 263 | } |
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| 264 | else if( this->finish.action_code == Release_Multi_Schedule ) { |
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| 265 | for(int i = 0; i < this->finish.lock_count; i++) { |
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| 266 | unlock( this->finish.locks[i] ); |
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| 267 | } |
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| 268 | for(int i = 0; i < this->finish.thrd_count; i++) { |
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| 269 | ScheduleThread( this->finish.thrds[i] ); |
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| 270 | } |
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| 271 | } |
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[db6f06a] | 272 | else { |
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| 273 | assert(this->finish.action_code == No_Action); |
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[8fcbb4c] | 274 | } |
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[c84e80a] | 275 | } |
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| 276 | |
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[0c92c9f] | 277 | // Handles spinning logic |
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| 278 | // TODO : find some strategy to put cores to sleep after some time |
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[c84e80a] | 279 | void spin(processor * this, unsigned int * spin_count) { |
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| 280 | (*spin_count)++; |
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| 281 | } |
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| 282 | |
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[0c92c9f] | 283 | // Context invoker for processors |
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| 284 | // This is the entry point for processors (kernel threads) |
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| 285 | // It effectively constructs a coroutine by stealing the pthread stack |
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[8def349] | 286 | void * CtxInvokeProcessor(void * arg) { |
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| 287 | processor * proc = (processor *) arg; |
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| 288 | this_processor = proc; |
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[1c273d0] | 289 | this_coroutine = NULL; |
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| 290 | this_thread = NULL; |
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[4e6fb8e] | 291 | disable_preempt_count = 1; |
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[8def349] | 292 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 293 | // which is needed for the 2-step context switch. However, there is no reason |
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[1c273d0] | 294 | // to waste the perfectly valid stack create by pthread. |
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[8def349] | 295 | current_stack_info_t info; |
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| 296 | machine_context_t ctx; |
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| 297 | info.context = &ctx; |
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| 298 | processorCtx_t proc_cor_storage = { proc, &info }; |
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| 299 | |
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[9d944b2] | 300 | LIB_DEBUG_PRINT_SAFE("Coroutine : created stack %p\n", proc_cor_storage.__cor.stack.base); |
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[8fcbb4c] | 301 | |
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[0c92c9f] | 302 | //Set global state |
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[1c273d0] | 303 | this_coroutine = &proc->runner->__cor; |
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| 304 | this_thread = NULL; |
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[8def349] | 305 | |
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| 306 | //We now have a proper context from which to schedule threads |
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[9d944b2] | 307 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p created (%p, %p)\n", proc, proc->runner, &ctx); |
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[8def349] | 308 | |
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[1c273d0] | 309 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 310 | // resume it to start it like it normally would, it will just context switch |
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| 311 | // back to here. Instead directly call the main since we already are on the |
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[8def349] | 312 | // appropriate stack. |
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[17af7d1] | 313 | proc_cor_storage.__cor.state = Active; |
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[4aa2fb2] | 314 | main( &proc_cor_storage ); |
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| 315 | proc_cor_storage.__cor.state = Halted; |
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[8def349] | 316 | |
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[0c92c9f] | 317 | // Main routine of the core returned, the core is now fully terminated |
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[1c273d0] | 318 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p main ended (%p)\n", proc, proc->runner); |
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[8def349] | 319 | |
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| 320 | return NULL; |
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[c84e80a] | 321 | } |
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| 322 | |
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[8def349] | 323 | void start(processor * this) { |
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[9d944b2] | 324 | LIB_DEBUG_PRINT_SAFE("Kernel : Starting core %p\n", this); |
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[82ff5845] | 325 | |
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| 326 | // SIGALRM must only be caught by the system processor |
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| 327 | sigset_t old_mask; |
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| 328 | bool is_system_proc = this_processor == &systemProcessor->proc; |
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| 329 | if ( is_system_proc ) { |
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| 330 | // Child kernel-thread inherits the signal mask from the parent kernel-thread. So one special case for the |
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| 331 | // system processor creating the user processor => toggle the blocking SIGALRM on system processor, create user |
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| 332 | // processor, and toggle back (below) previous signal mask of the system processor. |
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| 333 | |
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| 334 | sigset_t new_mask; |
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| 335 | sigemptyset( &new_mask ); |
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| 336 | sigemptyset( &old_mask ); |
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| 337 | sigaddset( &new_mask, SIGALRM ); |
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| 338 | |
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[47ecf2b] | 339 | if ( pthread_sigmask( SIG_BLOCK, &new_mask, &old_mask ) == -1 ) { |
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| 340 | abortf( "internal error, pthread_sigmask" ); |
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[82ff5845] | 341 | } |
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| 342 | |
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| 343 | assert( ! sigismember( &old_mask, SIGALRM ) ); |
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| 344 | } |
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| 345 | |
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[8fcbb4c] | 346 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
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[eb2e723] | 347 | |
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[82ff5845] | 348 | // Toggle back previous signal mask of system processor. |
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| 349 | if ( is_system_proc ) { |
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[47ecf2b] | 350 | if ( pthread_sigmask( SIG_SETMASK, &old_mask, NULL ) == -1 ) { |
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| 351 | abortf( "internal error, pthread_sigmask" ); |
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[82ff5845] | 352 | } // if |
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| 353 | } // if |
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| 354 | |
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[1c273d0] | 355 | LIB_DEBUG_PRINT_SAFE("Kernel : core %p started\n", this); |
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[eb2e723] | 356 | } |
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| 357 | |
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[8def349] | 358 | //----------------------------------------------------------------------------- |
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| 359 | // Scheduler routines |
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[348006f] | 360 | void ScheduleThread( thread_desc * thrd ) { |
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[1c273d0] | 361 | // if( !thrd ) return; |
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| 362 | assert( thrd ); |
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| 363 | assert( thrd->cor.state != Halted ); |
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| 364 | |
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| 365 | verify( disable_preempt_count > 0 ); |
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[690f13c] | 366 | |
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[4aa2fb2] | 367 | verifyf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
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[1c273d0] | 368 | |
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[2ac095d] | 369 | lock( &systemProcessor->proc.cltr->lock DEBUG_CTX2 ); |
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[fa21ac9] | 370 | append( &systemProcessor->proc.cltr->ready_queue, thrd ); |
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| 371 | unlock( &systemProcessor->proc.cltr->lock ); |
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[1c273d0] | 372 | |
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| 373 | verify( disable_preempt_count > 0 ); |
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[db6f06a] | 374 | } |
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| 375 | |
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[348006f] | 376 | thread_desc * nextThread(cluster * this) { |
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[1c273d0] | 377 | verify( disable_preempt_count > 0 ); |
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[2ac095d] | 378 | lock( &this->lock DEBUG_CTX2 ); |
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[348006f] | 379 | thread_desc * head = pop_head( &this->ready_queue ); |
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[db6f06a] | 380 | unlock( &this->lock ); |
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[1c273d0] | 381 | verify( disable_preempt_count > 0 ); |
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[db6f06a] | 382 | return head; |
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[eb2e723] | 383 | } |
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| 384 | |
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[82ff5845] | 385 | void BlockInternal() { |
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| 386 | disable_interrupts(); |
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[0b33412] | 387 | verify( disable_preempt_count > 0 ); |
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[75f3522] | 388 | suspend(); |
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[0b33412] | 389 | verify( disable_preempt_count > 0 ); |
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[2ac095d] | 390 | enable_interrupts( DEBUG_CTX ); |
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[75f3522] | 391 | } |
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| 392 | |
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[82ff5845] | 393 | void BlockInternal( spinlock * lock ) { |
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| 394 | disable_interrupts(); |
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[89a3df5] | 395 | this_processor->finish.action_code = Release; |
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| 396 | this_processor->finish.lock = lock; |
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[0b33412] | 397 | |
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| 398 | verify( disable_preempt_count > 0 ); |
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[db6f06a] | 399 | suspend(); |
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[0b33412] | 400 | verify( disable_preempt_count > 0 ); |
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| 401 | |
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[2ac095d] | 402 | enable_interrupts( DEBUG_CTX ); |
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[db6f06a] | 403 | } |
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| 404 | |
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[82ff5845] | 405 | void BlockInternal( thread_desc * thrd ) { |
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| 406 | disable_interrupts(); |
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[1c273d0] | 407 | assert( thrd->cor.state != Halted ); |
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[89a3df5] | 408 | this_processor->finish.action_code = Schedule; |
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| 409 | this_processor->finish.thrd = thrd; |
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[0b33412] | 410 | |
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| 411 | verify( disable_preempt_count > 0 ); |
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[db6f06a] | 412 | suspend(); |
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[0b33412] | 413 | verify( disable_preempt_count > 0 ); |
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| 414 | |
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[2ac095d] | 415 | enable_interrupts( DEBUG_CTX ); |
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[db6f06a] | 416 | } |
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| 417 | |
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[82ff5845] | 418 | void BlockInternal( spinlock * lock, thread_desc * thrd ) { |
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| 419 | disable_interrupts(); |
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[89a3df5] | 420 | this_processor->finish.action_code = Release_Schedule; |
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| 421 | this_processor->finish.lock = lock; |
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| 422 | this_processor->finish.thrd = thrd; |
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[0b33412] | 423 | |
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| 424 | verify( disable_preempt_count > 0 ); |
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[db6f06a] | 425 | suspend(); |
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[0b33412] | 426 | verify( disable_preempt_count > 0 ); |
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| 427 | |
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[2ac095d] | 428 | enable_interrupts( DEBUG_CTX ); |
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[eb2e723] | 429 | } |
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| 430 | |
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[82ff5845] | 431 | void BlockInternal(spinlock ** locks, unsigned short count) { |
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| 432 | disable_interrupts(); |
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[0c78741] | 433 | this_processor->finish.action_code = Release_Multi; |
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| 434 | this_processor->finish.locks = locks; |
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| 435 | this_processor->finish.lock_count = count; |
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[0b33412] | 436 | |
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| 437 | verify( disable_preempt_count > 0 ); |
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[0c78741] | 438 | suspend(); |
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[0b33412] | 439 | verify( disable_preempt_count > 0 ); |
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| 440 | |
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[2ac095d] | 441 | enable_interrupts( DEBUG_CTX ); |
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[0c78741] | 442 | } |
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| 443 | |
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[82ff5845] | 444 | void BlockInternal(spinlock ** locks, unsigned short lock_count, thread_desc ** thrds, unsigned short thrd_count) { |
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| 445 | disable_interrupts(); |
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[0c78741] | 446 | this_processor->finish.action_code = Release_Multi_Schedule; |
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| 447 | this_processor->finish.locks = locks; |
---|
| 448 | this_processor->finish.lock_count = lock_count; |
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| 449 | this_processor->finish.thrds = thrds; |
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| 450 | this_processor->finish.thrd_count = thrd_count; |
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[0b33412] | 451 | |
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| 452 | verify( disable_preempt_count > 0 ); |
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[0c78741] | 453 | suspend(); |
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[0b33412] | 454 | verify( disable_preempt_count > 0 ); |
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| 455 | |
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[2ac095d] | 456 | enable_interrupts( DEBUG_CTX ); |
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[0c78741] | 457 | } |
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| 458 | |
---|
[fa21ac9] | 459 | //============================================================================================= |
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| 460 | // Kernel Setup logic |
---|
| 461 | //============================================================================================= |
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[eb2e723] | 462 | //----------------------------------------------------------------------------- |
---|
| 463 | // Kernel boot procedures |
---|
| 464 | void kernel_startup(void) { |
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[1c273d0] | 465 | LIB_DEBUG_PRINT_SAFE("Kernel : Starting\n"); |
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[eb2e723] | 466 | |
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| 467 | // Start by initializing the main thread |
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[1c273d0] | 468 | // SKULLDUGGERY: the mainThread steals the process main thread |
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[8fcbb4c] | 469 | // which will then be scheduled by the systemProcessor normally |
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[348006f] | 470 | mainThread = (thread_desc *)&mainThread_storage; |
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[8fcbb4c] | 471 | current_stack_info_t info; |
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[8def349] | 472 | mainThread{ &info }; |
---|
[eb2e723] | 473 | |
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[fa21ac9] | 474 | LIB_DEBUG_PRINT_SAFE("Kernel : Main thread ready\n"); |
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| 475 | |
---|
[bd98b58] | 476 | // Initialize the system cluster |
---|
| 477 | systemCluster = (cluster *)&systemCluster_storage; |
---|
| 478 | systemCluster{}; |
---|
| 479 | |
---|
[fa21ac9] | 480 | LIB_DEBUG_PRINT_SAFE("Kernel : System cluster ready\n"); |
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| 481 | |
---|
[8def349] | 482 | // Initialize the system processor and the system processor ctx |
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[eb2e723] | 483 | // (the coroutine that contains the processing control flow) |
---|
[fa21ac9] | 484 | systemProcessor = (system_proc_t *)&systemProcessor_storage; |
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[8def349] | 485 | systemProcessor{ systemCluster, (processorCtx_t *)&systemProcessorCtx_storage }; |
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[eb2e723] | 486 | |
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[1c273d0] | 487 | // Add the main thread to the ready queue |
---|
[fa21ac9] | 488 | // once resume is called on systemProcessor->runner the mainThread needs to be scheduled like any normal thread |
---|
[75f3522] | 489 | ScheduleThread(mainThread); |
---|
[eb2e723] | 490 | |
---|
[dcb42b8] | 491 | //initialize the global state variables |
---|
[fa21ac9] | 492 | this_processor = &systemProcessor->proc; |
---|
[1c273d0] | 493 | this_thread = mainThread; |
---|
| 494 | this_coroutine = &mainThread->cor; |
---|
[4e6fb8e] | 495 | disable_preempt_count = 1; |
---|
[eb2e723] | 496 | |
---|
[82ff5845] | 497 | // Enable preemption |
---|
| 498 | kernel_start_preemption(); |
---|
| 499 | |
---|
[dcb42b8] | 500 | // SKULLDUGGERY: Force a context switch to the system processor to set the main thread's context to the current UNIX |
---|
| 501 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
---|
[1c273d0] | 502 | // mainThread is on the ready queue when this call is made. |
---|
[fa21ac9] | 503 | resume( systemProcessor->proc.runner ); |
---|
[eb2e723] | 504 | |
---|
[dcb42b8] | 505 | |
---|
| 506 | |
---|
| 507 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
---|
[9d944b2] | 508 | LIB_DEBUG_PRINT_SAFE("Kernel : Started\n--------------------------------------------------\n\n"); |
---|
[82ff5845] | 509 | |
---|
[2ac095d] | 510 | enable_interrupts( DEBUG_CTX ); |
---|
[eb2e723] | 511 | } |
---|
| 512 | |
---|
[dcb42b8] | 513 | void kernel_shutdown(void) { |
---|
[9d944b2] | 514 | LIB_DEBUG_PRINT_SAFE("\n--------------------------------------------------\nKernel : Shutting down\n"); |
---|
[eb2e723] | 515 | |
---|
[4e6fb8e] | 516 | disable_interrupts(); |
---|
| 517 | |
---|
[dcb42b8] | 518 | // SKULLDUGGERY: Notify the systemProcessor it needs to terminates. |
---|
| 519 | // When its coroutine terminates, it return control to the mainThread |
---|
| 520 | // which is currently here |
---|
[fa21ac9] | 521 | systemProcessor->proc.is_terminated = true; |
---|
[eb2e723] | 522 | suspend(); |
---|
| 523 | |
---|
[dcb42b8] | 524 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
---|
[eb2e723] | 525 | |
---|
[82ff5845] | 526 | // Disable preemption |
---|
| 527 | kernel_stop_preemption(); |
---|
| 528 | |
---|
[dcb42b8] | 529 | // Destroy the system processor and its context in reverse order of construction |
---|
| 530 | // These were manually constructed so we need manually destroy them |
---|
[fa21ac9] | 531 | ^(systemProcessor->proc.runner){}; |
---|
[eb2e723] | 532 | ^(systemProcessor){}; |
---|
| 533 | |
---|
[dcb42b8] | 534 | // Final step, destroy the main thread since it is no longer needed |
---|
| 535 | // Since we provided a stack to this taxk it will not destroy anything |
---|
[eb2e723] | 536 | ^(mainThread){}; |
---|
| 537 | |
---|
[1c273d0] | 538 | LIB_DEBUG_PRINT_SAFE("Kernel : Shutdown complete\n"); |
---|
[9d944b2] | 539 | } |
---|
| 540 | |
---|
| 541 | static spinlock kernel_abort_lock; |
---|
| 542 | static spinlock kernel_debug_lock; |
---|
| 543 | static bool kernel_abort_called = false; |
---|
| 544 | |
---|
| 545 | void * kernel_abort (void) __attribute__ ((__nothrow__)) { |
---|
| 546 | // abort cannot be recursively entered by the same or different processors because all signal handlers return when |
---|
| 547 | // the globalAbort flag is true. |
---|
[2ac095d] | 548 | lock( &kernel_abort_lock DEBUG_CTX2 ); |
---|
[9d944b2] | 549 | |
---|
| 550 | // first task to abort ? |
---|
| 551 | if ( !kernel_abort_called ) { // not first task to abort ? |
---|
| 552 | kernel_abort_called = true; |
---|
| 553 | unlock( &kernel_abort_lock ); |
---|
[1c273d0] | 554 | } |
---|
[9d944b2] | 555 | else { |
---|
| 556 | unlock( &kernel_abort_lock ); |
---|
[1c273d0] | 557 | |
---|
[9d944b2] | 558 | sigset_t mask; |
---|
| 559 | sigemptyset( &mask ); |
---|
| 560 | sigaddset( &mask, SIGALRM ); // block SIGALRM signals |
---|
| 561 | sigaddset( &mask, SIGUSR1 ); // block SIGUSR1 signals |
---|
| 562 | sigsuspend( &mask ); // block the processor to prevent further damage during abort |
---|
[1c273d0] | 563 | _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it |
---|
[9d944b2] | 564 | } |
---|
| 565 | |
---|
[1c273d0] | 566 | return this_thread; |
---|
[9d944b2] | 567 | } |
---|
| 568 | |
---|
| 569 | void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) { |
---|
| 570 | thread_desc * thrd = kernel_data; |
---|
| 571 | |
---|
| 572 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing task %.256s (%p)", thrd->cor.name, thrd ); |
---|
| 573 | __lib_debug_write( STDERR_FILENO, abort_text, len ); |
---|
| 574 | |
---|
[1c273d0] | 575 | if ( thrd != this_coroutine ) { |
---|
| 576 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", this_coroutine->name, this_coroutine ); |
---|
[9d944b2] | 577 | __lib_debug_write( STDERR_FILENO, abort_text, len ); |
---|
[1c273d0] | 578 | } |
---|
[9d944b2] | 579 | else { |
---|
| 580 | __lib_debug_write( STDERR_FILENO, ".\n", 2 ); |
---|
| 581 | } |
---|
| 582 | } |
---|
| 583 | |
---|
| 584 | extern "C" { |
---|
| 585 | void __lib_debug_acquire() { |
---|
[2ac095d] | 586 | lock( &kernel_debug_lock DEBUG_CTX2 ); |
---|
[9d944b2] | 587 | } |
---|
| 588 | |
---|
| 589 | void __lib_debug_release() { |
---|
[2ac095d] | 590 | unlock( &kernel_debug_lock ); |
---|
[9d944b2] | 591 | } |
---|
[8118303] | 592 | } |
---|
| 593 | |
---|
[fa21ac9] | 594 | //============================================================================================= |
---|
| 595 | // Kernel Utilities |
---|
| 596 | //============================================================================================= |
---|
[bd98b58] | 597 | //----------------------------------------------------------------------------- |
---|
| 598 | // Locks |
---|
[db6f06a] | 599 | void ?{}( spinlock * this ) { |
---|
| 600 | this->lock = 0; |
---|
[bd98b58] | 601 | } |
---|
[db6f06a] | 602 | void ^?{}( spinlock * this ) { |
---|
[bd98b58] | 603 | |
---|
[db6f06a] | 604 | } |
---|
| 605 | |
---|
[2ac095d] | 606 | bool try_lock( spinlock * this DEBUG_CTX_PARAM2 ) { |
---|
[b227f68] | 607 | return this->lock == 0 && __sync_lock_test_and_set_4( &this->lock, 1 ) == 0; |
---|
[c81ebf9] | 608 | } |
---|
| 609 | |
---|
[2ac095d] | 610 | void lock( spinlock * this DEBUG_CTX_PARAM2 ) { |
---|
[db6f06a] | 611 | for ( unsigned int i = 1;; i += 1 ) { |
---|
[b227f68] | 612 | if ( this->lock == 0 && __sync_lock_test_and_set_4( &this->lock, 1 ) == 0 ) { break; } |
---|
[db6f06a] | 613 | } |
---|
[b227f68] | 614 | LIB_DEBUG_DO( |
---|
| 615 | this->prev_name = caller; |
---|
| 616 | this->prev_thrd = this_thread; |
---|
| 617 | ) |
---|
[db6f06a] | 618 | } |
---|
[bd98b58] | 619 | |
---|
[b227f68] | 620 | void lock_yield( spinlock * this DEBUG_CTX_PARAM2 ) { |
---|
| 621 | for ( unsigned int i = 1;; i += 1 ) { |
---|
| 622 | if ( this->lock == 0 && __sync_lock_test_and_set_4( &this->lock, 1 ) == 0 ) { break; } |
---|
| 623 | yield(); |
---|
| 624 | } |
---|
| 625 | LIB_DEBUG_DO( |
---|
| 626 | this->prev_name = caller; |
---|
| 627 | this->prev_thrd = this_thread; |
---|
| 628 | ) |
---|
| 629 | } |
---|
| 630 | |
---|
| 631 | |
---|
[db6f06a] | 632 | void unlock( spinlock * this ) { |
---|
| 633 | __sync_lock_release_4( &this->lock ); |
---|
[bd98b58] | 634 | } |
---|
| 635 | |
---|
[db6f06a] | 636 | void ?{}( signal_once * this ) { |
---|
[5ea06d6] | 637 | this->cond = false; |
---|
[db6f06a] | 638 | } |
---|
| 639 | void ^?{}( signal_once * this ) { |
---|
| 640 | |
---|
| 641 | } |
---|
| 642 | |
---|
| 643 | void wait( signal_once * this ) { |
---|
[2ac095d] | 644 | lock( &this->lock DEBUG_CTX2 ); |
---|
[5ea06d6] | 645 | if( !this->cond ) { |
---|
[1c273d0] | 646 | append( &this->blocked, (thread_desc*)this_thread ); |
---|
[82ff5845] | 647 | BlockInternal( &this->lock ); |
---|
[8def349] | 648 | } |
---|
[4e6fb8e] | 649 | else { |
---|
| 650 | unlock( &this->lock ); |
---|
| 651 | } |
---|
[bd98b58] | 652 | } |
---|
| 653 | |
---|
[db6f06a] | 654 | void signal( signal_once * this ) { |
---|
[2ac095d] | 655 | lock( &this->lock DEBUG_CTX2 ); |
---|
[db6f06a] | 656 | { |
---|
[5ea06d6] | 657 | this->cond = true; |
---|
[db6f06a] | 658 | |
---|
[4e6fb8e] | 659 | disable_interrupts(); |
---|
[348006f] | 660 | thread_desc * it; |
---|
[db6f06a] | 661 | while( it = pop_head( &this->blocked) ) { |
---|
| 662 | ScheduleThread( it ); |
---|
| 663 | } |
---|
[2ac095d] | 664 | enable_interrupts( DEBUG_CTX ); |
---|
[bd98b58] | 665 | } |
---|
[db6f06a] | 666 | unlock( &this->lock ); |
---|
[bd98b58] | 667 | } |
---|
| 668 | |
---|
| 669 | //----------------------------------------------------------------------------- |
---|
| 670 | // Queues |
---|
[5ea06d6] | 671 | void ?{}( __thread_queue_t * this ) { |
---|
[bd98b58] | 672 | this->head = NULL; |
---|
| 673 | this->tail = &this->head; |
---|
| 674 | } |
---|
| 675 | |
---|
[5ea06d6] | 676 | void append( __thread_queue_t * this, thread_desc * t ) { |
---|
[4aa2fb2] | 677 | verify(this->tail != NULL); |
---|
[bd98b58] | 678 | *this->tail = t; |
---|
| 679 | this->tail = &t->next; |
---|
| 680 | } |
---|
| 681 | |
---|
[5ea06d6] | 682 | thread_desc * pop_head( __thread_queue_t * this ) { |
---|
[348006f] | 683 | thread_desc * head = this->head; |
---|
[bd98b58] | 684 | if( head ) { |
---|
| 685 | this->head = head->next; |
---|
| 686 | if( !head->next ) { |
---|
| 687 | this->tail = &this->head; |
---|
| 688 | } |
---|
| 689 | head->next = NULL; |
---|
[1c273d0] | 690 | } |
---|
[bd98b58] | 691 | return head; |
---|
| 692 | } |
---|
[690f13c] | 693 | |
---|
[0c78741] | 694 | void ?{}( __condition_stack_t * this ) { |
---|
[690f13c] | 695 | this->top = NULL; |
---|
| 696 | } |
---|
| 697 | |
---|
[0c78741] | 698 | void push( __condition_stack_t * this, __condition_criterion_t * t ) { |
---|
[4aa2fb2] | 699 | verify( !t->next ); |
---|
[690f13c] | 700 | t->next = this->top; |
---|
| 701 | this->top = t; |
---|
| 702 | } |
---|
| 703 | |
---|
[0c78741] | 704 | __condition_criterion_t * pop( __condition_stack_t * this ) { |
---|
| 705 | __condition_criterion_t * top = this->top; |
---|
[690f13c] | 706 | if( top ) { |
---|
| 707 | this->top = top->next; |
---|
| 708 | top->next = NULL; |
---|
[1c273d0] | 709 | } |
---|
[690f13c] | 710 | return top; |
---|
| 711 | } |
---|
[8118303] | 712 | // Local Variables: // |
---|
| 713 | // mode: c // |
---|
| 714 | // tab-width: 4 // |
---|
| 715 | // End: // |
---|