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 | // threads.c -- |
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9 | // |
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10 | // Author : Thierry Delisle |
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11 | // Created On : Tue Jan 17 12:27:26 2016 |
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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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17 | #include "threads" |
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18 | |
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19 | #include "kernel" |
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20 | #include "libhdr.h" |
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21 | |
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22 | #define __CFA_INVOKE_PRIVATE__ |
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23 | #include "invoke.h" |
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24 | |
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25 | extern "C" { |
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26 | #include <fenv.h> |
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27 | #include <stddef.h> |
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28 | } |
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29 | |
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30 | extern processor * get_this_processor(); |
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31 | |
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32 | //----------------------------------------------------------------------------- |
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33 | // Forward declarations |
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34 | forall( dtype T | is_thread(T) ) |
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35 | void start( T* this ); |
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36 | |
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37 | forall( dtype T | is_thread(T) ) |
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38 | void stop( T* this ); |
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39 | |
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40 | //----------------------------------------------------------------------------- |
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41 | // Thread ctors and dtors |
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42 | |
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43 | void ?{}(thread* this) { |
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44 | (&this->c){}; |
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45 | this->c.name = "Anonymous Coroutine"; |
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46 | (&this->lock){}; |
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47 | this->next = NULL; |
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48 | } |
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49 | |
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50 | void ^?{}(thread* this) { |
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51 | ^(&this->c){}; |
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52 | } |
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53 | |
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54 | forall( dtype T | sized(T) | is_thread(T) | { void ?{}(T*); } ) |
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55 | void ?{}( scoped(T)* this ) { |
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56 | (&this->handle){}; |
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57 | start(&this->handle); |
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58 | } |
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59 | |
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60 | forall( dtype T, ttype P | sized(T) | is_thread(T) | { void ?{}(T*, P); } ) |
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61 | void ?{}( scoped(T)* this, P params ) { |
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62 | (&this->handle){ params }; |
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63 | start(&this->handle); |
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64 | } |
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65 | |
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66 | forall( dtype T | sized(T) | is_thread(T) | { void ^?{}(T*); } ) |
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67 | void ^?{}( scoped(T)* this ) { |
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68 | stop(&this->handle); |
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69 | ^(&this->handle){}; |
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70 | } |
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71 | |
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72 | //----------------------------------------------------------------------------- |
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73 | // Starting and stopping threads |
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74 | extern "C" { |
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75 | forall(dtype T | is_thread(T)) |
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76 | void CtxInvokeThread(T * this); |
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77 | } |
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78 | |
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79 | extern void thread_schedule( thread * ); |
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80 | |
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81 | forall( dtype T | is_thread(T) ) |
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82 | void start( T* this ) { |
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83 | coroutine* thrd_c = get_coroutine(this); |
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84 | thread* thrd_h = get_thread (this); |
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85 | thrd_c->last = this_coroutine(); |
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86 | get_this_processor()->current_coroutine = thrd_c; |
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87 | |
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88 | LIB_DEBUG_PRINTF("Thread start : %p (t %p, c %p)\n", this, thrd_c, thrd_h); |
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89 | |
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90 | create_stack(&thrd_c->stack, thrd_c->stack.size); |
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91 | CtxStart(this, CtxInvokeThread); |
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92 | CtxSwitch( thrd_c->last->stack.context, thrd_c->stack.context ); |
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93 | |
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94 | fenv_t envp; |
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95 | fegetenv( &envp ); |
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96 | LIB_DEBUG_PRINTF("Thread : mxcsr %x\n", envp.__mxcsr); |
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97 | LIB_DEBUG_PRINTF("Thread started : %p (t %p, c %p)\n", this, thrd_c, thrd_h); |
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98 | |
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99 | thread_schedule(thrd_h); |
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100 | } |
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101 | |
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102 | forall( dtype T | is_thread(T) ) |
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103 | void stop( T* this ) { |
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104 | thread* thrd = get_thread(this); |
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105 | if( thrd->c.notHalted ) { |
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106 | lock( &thrd->lock ); |
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107 | } |
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108 | } |
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109 | |
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110 | void yield( void ) { |
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111 | get_this_processor()->thread_action = Reschedule; |
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112 | suspend(); |
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113 | } |
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114 | |
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115 | void ThreadCtxSwitch(coroutine* src, coroutine* dst) { |
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116 | dst->last = src; |
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117 | |
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118 | // set state of current coroutine to inactive |
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119 | src->state = Inactive; |
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120 | |
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121 | // set new coroutine that task is executing |
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122 | get_this_processor()->current_coroutine = dst; |
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123 | |
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124 | // context switch to specified coroutine |
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125 | CtxSwitch( src->stack.context, dst->stack.context ); |
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126 | // when CtxSwitch returns we are back in the src coroutine |
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127 | |
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128 | // set state of new coroutine to active |
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129 | src->state = Active; |
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130 | } |
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131 | |
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132 | // C Helper to signal the termination of a thread |
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133 | // Used in invoke.c |
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134 | extern "C" { |
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135 | void __thread_signal_termination( thread * this ) { |
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136 | this->c.state = Halt; |
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137 | this->c.notHalted = false; |
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138 | unlock( &this->lock ); |
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139 | } |
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140 | } |
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141 | |
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142 | // Local Variables: // |
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143 | // mode: c // |
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144 | // tab-width: 4 // |
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145 | // End: // |
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