1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // thread.c -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Tue Jan 17 12:27:26 2017 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Fri Mar 30 17:19:52 2018 |
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13 | // Update Count : 8 |
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14 | // |
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15 | |
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16 | #include "thread" |
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17 | |
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18 | #include "kernel_private.h" |
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19 | |
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20 | #define __CFA_INVOKE_PRIVATE__ |
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21 | #include "invoke.h" |
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22 | |
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23 | extern "C" { |
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24 | #include <fenv.h> |
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25 | #include <stddef.h> |
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26 | } |
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27 | |
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28 | //extern volatile thread_local processor * this_processor; |
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29 | |
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30 | //----------------------------------------------------------------------------- |
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31 | // Thread ctors and dtors |
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32 | void ?{}(thread_desc & this, const char * const name, cluster & cl, void * storage, size_t storageSize ) with( this ) { |
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33 | self_cor{ name, storage, storageSize }; |
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34 | verify(&self_cor); |
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35 | curr_cor = &self_cor; |
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36 | self_mon.owner = &this; |
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37 | self_mon.recursion = 1; |
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38 | self_mon_p = &self_mon; |
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39 | curr_cluster = &cl; |
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40 | next = NULL; |
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41 | |
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42 | node.next = NULL; |
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43 | node.prev = NULL; |
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44 | doregister(this); |
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45 | |
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46 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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47 | } |
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48 | |
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49 | void ^?{}(thread_desc& this) with( this ) { |
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50 | unregister(this); |
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51 | ^self_cor{}; |
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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 ) with( this ) { |
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56 | handle{}; |
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57 | __thrd_start(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 ) with( this ) { |
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62 | handle{ params }; |
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63 | __thrd_start(handle); |
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64 | } |
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65 | |
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66 | forall( dtype T | sized(T) | is_thread(T) ) |
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67 | void ^?{}( scoped(T)& this ) with( this ) { |
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68 | ^handle{}; |
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69 | } |
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70 | |
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71 | //----------------------------------------------------------------------------- |
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72 | // Starting and stopping threads |
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73 | forall( dtype T | is_thread(T) ) |
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74 | void __thrd_start( T& this ) { |
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75 | coroutine_desc* thrd_c = get_coroutine(this); |
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76 | thread_desc * thrd_h = get_thread (this); |
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77 | thrd_c->last = TL_GET( this_coroutine ); |
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78 | |
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79 | // __cfaabi_dbg_print_safe("Thread start : %p (t %p, c %p)\n", this, thrd_c, thrd_h); |
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80 | |
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81 | disable_interrupts(); |
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82 | create_stack(&thrd_c->stack, thrd_c->stack.size); |
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83 | kernelTLS.this_coroutine = thrd_c; |
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84 | CtxStart(&this, CtxInvokeThread); |
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85 | assert( thrd_c->last->stack.context ); |
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86 | CtxSwitch( thrd_c->last->stack.context, thrd_c->stack.context ); |
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87 | |
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88 | ScheduleThread(thrd_h); |
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89 | enable_interrupts( __cfaabi_dbg_ctx ); |
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90 | } |
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91 | |
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92 | extern "C" { |
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93 | // KERNEL ONLY |
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94 | void __finish_creation(void) { |
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95 | coroutine_desc* thrd_c = kernelTLS.this_coroutine; |
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96 | ThreadCtxSwitch( thrd_c, thrd_c->last ); |
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97 | } |
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98 | } |
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99 | |
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100 | void yield( void ) { |
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101 | // Safety note : This could cause some false positives due to preemption |
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102 | verify( TL_GET( preemption_state.enabled ) ); |
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103 | BlockInternal( TL_GET( this_thread ) ); |
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104 | // Safety note : This could cause some false positives due to preemption |
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105 | verify( TL_GET( preemption_state.enabled ) ); |
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106 | } |
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107 | |
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108 | void yield( unsigned times ) { |
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109 | for( unsigned i = 0; i < times; i++ ) { |
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110 | yield(); |
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111 | } |
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112 | } |
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113 | |
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114 | // KERNEL ONLY |
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115 | void ThreadCtxSwitch(coroutine_desc* src, coroutine_desc* dst) { |
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116 | // set state of current coroutine to inactive |
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117 | src->state = src->state == Halted ? Halted : Inactive; |
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118 | dst->state = Active; |
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119 | |
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120 | // set new coroutine that the processor is executing |
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121 | // and context switch to it |
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122 | kernelTLS.this_coroutine = dst; |
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123 | assert( src->stack.context ); |
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124 | CtxSwitch( src->stack.context, dst->stack.context ); |
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125 | kernelTLS.this_coroutine = src; |
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126 | |
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127 | // set state of new coroutine to active |
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128 | dst->state = dst->state == Halted ? Halted : Inactive; |
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129 | src->state = Active; |
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130 | } |
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131 | |
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132 | // Local Variables: // |
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133 | // mode: c // |
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134 | // tab-width: 4 // |
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135 | // End: // |
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