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 : Sat Feb 12 15:24:18 2022 |
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13 | // Update Count : 66 |
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14 | // |
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15 | |
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16 | #define __cforall_thread__ |
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17 | #define _GNU_SOURCE |
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18 | |
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19 | #include "thread.hfa" |
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20 | |
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21 | #include "exception.hfa" |
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22 | #include "kernel/private.hfa" |
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23 | #include "limits.hfa" |
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24 | |
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25 | #define __CFA_INVOKE_PRIVATE__ |
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26 | #include "invoke.h" |
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27 | |
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28 | extern uint32_t __global_random_seed, __global_random_prime, __global_random_mask; |
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29 | |
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30 | #pragma GCC visibility push(default) |
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31 | |
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32 | //----------------------------------------------------------------------------- |
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33 | // Thread ctors and dtors |
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34 | void ?{}( thread$ & this, const char * const name, cluster & cl, void * storage, size_t storageSize ) with( this ) { |
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35 | context{ 0p, 0p }; |
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36 | self_cor{ name, storage, storageSize }; |
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37 | ticket = TICKET_RUNNING; |
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38 | state = Start; |
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39 | preempted = __NO_PREEMPTION; |
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40 | corctx_flag = false; |
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41 | curr_cor = &self_cor; |
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42 | self_mon.owner = &this; |
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43 | self_mon.recursion = 1; |
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44 | self_mon_p = &self_mon; |
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45 | curr_cluster = &cl; |
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46 | link.next = 0p; |
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47 | link.ts = MAX; |
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48 | preferred = ready_queue_new_preferred(); |
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49 | last_proc = 0p; |
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50 | random_state = __global_random_mask ? __global_random_prime : __global_random_prime ^ rdtscl(); |
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51 | #if defined( __CFA_WITH_VERIFY__ ) |
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52 | executing = 0p; |
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53 | canary = 0x0D15EA5E0D15EA5Ep; |
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54 | #endif |
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55 | |
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56 | node.next = 0p; |
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57 | node.prev = 0p; |
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58 | |
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59 | clh_node = malloc( ); |
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60 | *clh_node = false; |
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61 | |
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62 | doregister(curr_cluster, this); |
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63 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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64 | } |
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65 | |
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66 | void ^?{}(thread$& this) with( this ) { |
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67 | #if defined( __CFA_WITH_VERIFY__ ) |
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68 | canary = 0xDEADDEADDEADDEADp; |
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69 | #endif |
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70 | free(clh_node); |
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71 | unregister(curr_cluster, this); |
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72 | ^self_cor{}; |
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73 | } |
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74 | |
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75 | forall(T &) |
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76 | void copy(ThreadCancelled(T) * dst, ThreadCancelled(T) * src) { |
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77 | dst->virtual_table = src->virtual_table; |
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78 | dst->the_thread = src->the_thread; |
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79 | dst->the_exception = src->the_exception; |
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80 | } |
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81 | |
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82 | forall(T &) |
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83 | const char * msg(ThreadCancelled(T) *) { |
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84 | return "ThreadCancelled(...)"; |
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85 | } |
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86 | |
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87 | forall(T &) |
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88 | static void default_thread_cancel_handler(ThreadCancelled(T) & ) { |
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89 | // Improve this error message, can I do formatting? |
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90 | abort( "Unhandled thread cancellation.\n" ); |
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91 | } |
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92 | |
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93 | forall(T & | is_thread(T) | IS_EXCEPTION(ThreadCancelled(T)) |
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94 | | { EHM_DEFAULT_VTABLE(ThreadCancelled(T)); }) |
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95 | void ?{}( thread_dtor_guard_t & this, |
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96 | T & thrd, void(*cancelHandler)(ThreadCancelled(T) &)) { |
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97 | monitor$ * m = get_monitor(thrd); |
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98 | thread$ * desc = get_thread(thrd); |
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99 | |
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100 | // Setup the monitor guard |
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101 | void (*dtor)(T& mutex this) = ^?{}; |
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102 | bool join = cancelHandler != (void(*)(ThreadCancelled(T)&))0; |
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103 | (this.mg){&m, (void(*)())dtor, join}; |
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104 | |
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105 | |
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106 | /* paranoid */ verifyf( Halted == desc->state || Cancelled == desc->state, "Expected thread to be Halted or Cancelled, was %d\n", (int)desc->state ); |
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107 | |
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108 | // After the guard set-up and any wait, check for cancellation. |
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109 | struct _Unwind_Exception * cancellation = desc->self_cor.cancellation; |
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110 | if ( likely( 0p == cancellation ) ) { |
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111 | return; |
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112 | } else if ( Cancelled == desc->state ) { |
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113 | return; |
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114 | } |
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115 | desc->state = Cancelled; |
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116 | void(*defaultResumptionHandler)(ThreadCancelled(T) &) = |
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117 | join ? cancelHandler : default_thread_cancel_handler; |
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118 | |
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119 | // TODO: Remove explitate vtable set once trac#186 is fixed. |
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120 | ThreadCancelled(T) except; |
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121 | except.virtual_table = &_default_vtable; |
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122 | except.the_thread = &thrd; |
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123 | except.the_exception = __cfaehm_cancellation_exception( cancellation ); |
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124 | // Why is this cast required? |
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125 | throwResume (ThreadCancelled(T) &)except; |
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126 | |
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127 | except.the_exception->virtual_table->free( except.the_exception ); |
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128 | free( cancellation ); |
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129 | desc->self_cor.cancellation = 0p; |
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130 | } |
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131 | |
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132 | void ^?{}( thread_dtor_guard_t & this ) { |
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133 | ^(this.mg){}; |
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134 | } |
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135 | |
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136 | //----------------------------------------------------------------------------- |
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137 | // Starting and stopping threads |
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138 | forall( T & | is_thread(T) ) |
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139 | void __thrd_start( T & this, void (*main_p)(T &) ) { |
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140 | thread$ * this_thrd = get_thread(this); |
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141 | |
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142 | disable_interrupts(); |
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143 | __cfactx_start(main_p, get_coroutine(this), this, __cfactx_invoke_thread); |
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144 | |
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145 | this_thrd->context.[SP, FP] = this_thrd->self_cor.context.[SP, FP]; |
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146 | /* paranoid */ verify( this_thrd->context.SP ); |
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147 | |
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148 | schedule_thread$( this_thrd, UNPARK_LOCAL ); |
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149 | enable_interrupts(); |
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150 | } |
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151 | |
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152 | //----------------------------------------------------------------------------- |
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153 | // Support for threads that don't ues the thread keyword |
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154 | forall( T & | sized(T) | is_thread(T) | { void ?{}(T&); } ) |
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155 | void ?{}( scoped(T)& this ) with( this ) { |
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156 | handle{}; |
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157 | __thrd_start(handle, main); |
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158 | } |
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159 | |
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160 | forall( T &, P... | sized(T) | is_thread(T) | { void ?{}(T&, P); } ) |
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161 | void ?{}( scoped(T)& this, P params ) with( this ) { |
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162 | handle{ params }; |
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163 | __thrd_start(handle, main); |
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164 | } |
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165 | |
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166 | forall( T & | sized(T) | is_thread(T) ) |
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167 | void ^?{}( scoped(T)& this ) with( this ) { |
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168 | ^handle{}; |
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169 | } |
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170 | |
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171 | //----------------------------------------------------------------------------- |
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172 | forall(T & | is_thread(T) | IS_RESUMPTION_EXCEPTION(ThreadCancelled(T)) |
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173 | | { EHM_DEFAULT_VTABLE(ThreadCancelled(T)); }) |
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174 | T & join( T & this ) { |
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175 | thread_dtor_guard_t guard = { this, defaultResumptionHandler }; |
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176 | return this; |
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177 | } |
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178 | |
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179 | //----------------------------------------------------------------------------- |
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180 | bool migrate( thread$ * thrd, struct cluster & cl ) { |
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181 | |
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182 | monitor$ * tmon = get_monitor(thrd); |
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183 | monitor$ * __monitors[] = { tmon }; |
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184 | monitor_guard_t __guard = { __monitors, 1 }; |
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185 | |
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186 | |
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187 | { |
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188 | // if nothing needs to be done, return false |
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189 | if( thrd->curr_cluster == &cl ) return false; |
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190 | |
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191 | // are we migrating ourself? |
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192 | const bool local = thrd == active_thread(); |
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193 | |
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194 | /* paranoid */ verify( !local || &cl != active_cluster() ); |
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195 | /* paranoid */ verify( !local || thrd->curr_cluster == active_cluster() ); |
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196 | /* paranoid */ verify( !local || thrd->curr_cluster == active_processor()->cltr ); |
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197 | /* paranoid */ verify( local || tmon->signal_stack.top->owner->waiting_thread == thrd ); |
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198 | /* paranoid */ verify( local || tmon->signal_stack.top ); |
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199 | |
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200 | // make sure we aren't interrupted while doing this |
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201 | // not as important if we aren't local |
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202 | disable_interrupts(); |
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203 | |
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204 | // actually move the thread |
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205 | unregister( thrd->curr_cluster, *thrd ); |
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206 | thrd->curr_cluster = &cl; |
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207 | doregister( thrd->curr_cluster, *thrd ); |
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208 | |
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209 | // restore interrupts |
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210 | enable_interrupts(); |
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211 | |
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212 | // if this is the local thread, we are still running on the old cluster |
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213 | if(local) yield(); |
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214 | |
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215 | /* paranoid */ verify( !local || &cl == active_cluster() ); |
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216 | /* paranoid */ verify( !local || thrd->curr_cluster == active_cluster() ); |
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217 | /* paranoid */ verify( !local || thrd->curr_cluster == active_processor()->cltr ); |
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218 | /* paranoid */ verify( local || tmon->signal_stack.top ); |
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219 | /* paranoid */ verify( local || tmon->signal_stack.top->owner->waiting_thread == thrd ); |
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220 | |
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221 | return true; |
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222 | } |
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223 | } |
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224 | |
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225 | //----------------------------------------------------------------------------- |
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226 | #define GENERATOR LCG |
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227 | |
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228 | void set_seed( uint32_t seed ) { |
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229 | uint32_t & state = active_thread()->random_state; |
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230 | state = __global_random_seed = seed; |
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231 | GENERATOR( state ); |
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232 | __global_random_prime = state; |
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233 | __global_random_mask = true; |
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234 | } // set_seed |
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235 | |
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236 | uint32_t prng( void ) { // [0,UINT_MAX] |
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237 | uint32_t & state = active_thread()->random_state; |
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238 | return GENERATOR( state ); |
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239 | } // prng |
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240 | |
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241 | // Local Variables: // |
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242 | // mode: c // |
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243 | // tab-width: 4 // |
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244 | // End: // |
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