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 | // monitor_desc.c -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Thd Feb 23 12:27:26 2017 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Mon Jul 31 14:59:05 2017 |
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13 | // Update Count : 3 |
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14 | // |
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15 | |
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16 | #include "monitor" |
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17 | |
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18 | #include <stdlib> |
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19 | |
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20 | #include "libhdr.h" |
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21 | #include "kernel_private.h" |
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22 | |
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23 | //----------------------------------------------------------------------------- |
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24 | // Forward declarations |
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25 | static inline void set_owner( monitor_desc * this, thread_desc * owner ); |
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26 | static inline thread_desc * next_thread( monitor_desc * this ); |
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27 | static inline int is_accepted( thread_desc * owner, monitor_desc * this, const __monitor_group & monitors ); |
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28 | |
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29 | static inline void lock_all( spinlock ** locks, unsigned short count ); |
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30 | static inline void lock_all( monitor_desc ** source, spinlock ** /*out*/ locks, unsigned short count ); |
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31 | static inline void unlock_all( spinlock ** locks, unsigned short count ); |
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32 | static inline void unlock_all( monitor_desc ** locks, unsigned short count ); |
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33 | |
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34 | static inline void save_recursion ( monitor_desc ** ctx, unsigned int * /*out*/ recursions, unsigned short count ); |
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35 | static inline void restore_recursion( monitor_desc ** ctx, unsigned int * /*in */ recursions, unsigned short count ); |
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36 | |
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37 | static inline void init ( int count, monitor_desc ** monitors, __condition_node_t * waiter, __condition_criterion_t * criteria ); |
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38 | static inline void init_push( int count, monitor_desc ** monitors, __condition_node_t * waiter, __condition_criterion_t * criteria ); |
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39 | |
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40 | static inline thread_desc * check_condition( __condition_criterion_t * ); |
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41 | static inline void brand_condition( condition * ); |
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42 | static inline unsigned short insert_unique( thread_desc ** thrds, unsigned short end, thread_desc * val ); |
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43 | |
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44 | static inline [thread_desc *, int] search_entry_queue( __acceptable_t * acceptables, int acc_count, monitor_desc ** monitors, int count ); |
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45 | |
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46 | static inline short count_max( short acc_count, __acceptable_t * acceptables ); |
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47 | static inline short aggregate( monitor_desc ** storage, short count, __acceptable_t * acceptables ); |
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48 | static inline void set_mask ( monitor_desc ** storage, short count, __acceptable_t * acceptables, short acc_count ); |
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49 | |
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50 | //----------------------------------------------------------------------------- |
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51 | // Useful defines |
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52 | #define wait_ctx(thrd, user_info) /* Create the necessary information to use the signaller stack */ \ |
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53 | __condition_node_t waiter = { thrd, count, user_info }; /* Create the node specific to this wait operation */ \ |
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54 | __condition_criterion_t criteria[count]; /* Create the creteria this wait operation needs to wake up */ \ |
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55 | init( count, monitors, &waiter, criteria ); /* Link everything together */ \ |
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56 | |
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57 | #define wait_ctx_primed(thrd, user_info) /* Create the necessary information to use the signaller stack */ \ |
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58 | __condition_node_t waiter = { thrd, count, user_info }; /* Create the node specific to this wait operation */ \ |
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59 | __condition_criterion_t criteria[count]; /* Create the creteria this wait operation needs to wake up */ \ |
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60 | init_push( count, monitors, &waiter, criteria ); /* Link everything together and push it to the AS-Stack */ \ |
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61 | |
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62 | #define monitor_ctx( mons, cnt ) /* Define that create the necessary struct for internal/external scheduling operations */ \ |
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63 | monitor_desc ** monitors = mons; /* Save the targeted monitors */ \ |
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64 | unsigned short count = cnt; /* Save the count to a local variable */ \ |
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65 | unsigned int recursions[ count ]; /* Save the current recursion levels to restore them later */ \ |
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66 | spinlock * locks [ count ]; /* We need to pass-in an array of locks to BlockInternal */ \ |
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67 | |
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68 | //----------------------------------------------------------------------------- |
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69 | // Enter/Leave routines |
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70 | |
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71 | |
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72 | extern "C" { |
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73 | // Enter single monitor |
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74 | static void __enter_monitor_desc( const __monitor_group & group ) { |
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75 | monitor_desc * this = group.list[0]; |
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76 | |
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77 | // Lock the monitor spinlock, lock_yield to reduce contention |
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78 | lock_yield( &this->lock DEBUG_CTX2 ); |
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79 | thread_desc * thrd = this_thread; |
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80 | |
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81 | LIB_DEBUG_PRINT_SAFE("Kernel : %10p Entering mon %p (%p)\n", thrd, this, this->owner); |
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82 | |
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83 | this->accepted_index = -1; |
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84 | if( !this->owner ) { |
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85 | // No one has the monitor, just take it |
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86 | set_owner( this, thrd ); |
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87 | |
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88 | LIB_DEBUG_PRINT_SAFE("Kernel : mon is free \n"); |
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89 | } |
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90 | else if( this->owner == thrd) { |
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91 | // We already have the monitor, just not how many times we took it |
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92 | verify( this->recursion > 0 ); |
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93 | this->recursion += 1; |
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94 | |
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95 | LIB_DEBUG_PRINT_SAFE("Kernel : mon already owned \n"); |
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96 | } |
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97 | else if( (this->accepted_index = is_accepted( thrd, this, group)) >= 0 ) { |
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98 | // Some one was waiting for us, enter |
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99 | set_owner( this, thrd ); |
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100 | |
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101 | LIB_DEBUG_PRINT_SAFE("Kernel : mon accepts \n"); |
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102 | } |
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103 | else { |
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104 | LIB_DEBUG_PRINT_SAFE("Kernel : blocking \n"); |
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105 | |
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106 | // Some one else has the monitor, wait in line for it |
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107 | append( &this->entry_queue, thrd ); |
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108 | BlockInternal( &this->lock ); |
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109 | |
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110 | LIB_DEBUG_PRINT_SAFE("Kernel : %10p Entered mon %p\n", thrd, this); |
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111 | |
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112 | // BlockInternal will unlock spinlock, no need to unlock ourselves |
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113 | return; |
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114 | } |
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115 | |
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116 | LIB_DEBUG_PRINT_SAFE("Kernel : %10p Entered mon %p\n", thrd, this); |
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117 | |
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118 | // Release the lock and leave |
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119 | unlock( &this->lock ); |
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120 | return; |
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121 | } |
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122 | |
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123 | // Leave single monitor |
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124 | void __leave_monitor_desc( monitor_desc * this ) { |
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125 | // Lock the monitor spinlock, lock_yield to reduce contention |
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126 | lock_yield( &this->lock DEBUG_CTX2 ); |
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127 | |
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128 | verifyf( this_thread == this->owner, "Expected owner to be %p, got %p (r: %i)", this_thread, this->owner, this->recursion ); |
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129 | |
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130 | // Leaving a recursion level, decrement the counter |
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131 | this->recursion -= 1; |
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132 | |
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133 | // If we haven't left the last level of recursion |
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134 | // it means we don't need to do anything |
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135 | if( this->recursion != 0) { |
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136 | unlock( &this->lock ); |
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137 | return; |
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138 | } |
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139 | |
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140 | // Get the next thread, will be null on low contention monitor |
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141 | thread_desc * new_owner = next_thread( this ); |
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142 | |
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143 | // We can now let other threads in safely |
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144 | unlock( &this->lock ); |
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145 | |
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146 | //We need to wake-up the thread |
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147 | WakeThread( new_owner ); |
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148 | } |
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149 | |
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150 | // Leave the thread monitor |
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151 | // last routine called by a thread. |
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152 | // Should never return |
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153 | void __leave_thread_monitor( thread_desc * thrd ) { |
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154 | monitor_desc * this = &thrd->self_mon; |
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155 | |
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156 | // Lock the monitor now |
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157 | lock_yield( &this->lock DEBUG_CTX2 ); |
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158 | |
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159 | disable_interrupts(); |
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160 | |
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161 | thrd->self_cor.state = Halted; |
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162 | |
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163 | verifyf( thrd == this->owner, "Expected owner to be %p, got %p (r: %i)", thrd, this->owner, this->recursion ); |
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164 | |
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165 | // Leaving a recursion level, decrement the counter |
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166 | this->recursion -= 1; |
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167 | |
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168 | // If we haven't left the last level of recursion |
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169 | // it must mean there is an error |
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170 | if( this->recursion != 0) { abortf("Thread internal monitor has unbalanced recursion"); } |
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171 | |
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172 | // Fetch the next thread, can be null |
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173 | thread_desc * new_owner = next_thread( this ); |
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174 | |
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175 | // Leave the thread, this will unlock the spinlock |
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176 | // Use leave thread instead of BlockInternal which is |
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177 | // specialized for this case and supports null new_owner |
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178 | LeaveThread( &this->lock, new_owner ); |
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179 | |
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180 | // Control flow should never reach here! |
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181 | } |
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182 | } |
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183 | |
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184 | // Enter multiple monitor |
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185 | // relies on the monitor array being sorted |
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186 | static inline void enter( __monitor_group monitors ) { |
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187 | for(int i = 0; i < monitors.size; i++) { |
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188 | __enter_monitor_desc( monitors ); |
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189 | } |
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190 | } |
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191 | |
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192 | // Leave multiple monitor |
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193 | // relies on the monitor array being sorted |
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194 | static inline void leave(monitor_desc ** monitors, int count) { |
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195 | for(int i = count - 1; i >= 0; i--) { |
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196 | __leave_monitor_desc( monitors[i] ); |
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197 | } |
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198 | } |
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199 | |
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200 | // Ctor for monitor guard |
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201 | // Sorts monitors before entering |
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202 | void ?{}( monitor_guard_t & this, monitor_desc ** m, int count, void (*func)() ) { |
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203 | // Store current array |
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204 | this.m = m; |
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205 | this.count = count; |
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206 | |
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207 | // Sort monitors based on address -> TODO use a sort specialized for small numbers |
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208 | qsort(this.m, count); |
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209 | |
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210 | // Save previous thread context |
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211 | this.prev_mntrs = this_thread->monitors.list; |
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212 | this.prev_count = this_thread->monitors.size; |
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213 | this.prev_func = this_thread->monitors.func; |
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214 | |
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215 | // Update thread context (needed for conditions) |
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216 | this_thread->monitors.list = m; |
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217 | this_thread->monitors.size = count; |
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218 | this_thread->monitors.func = func; |
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219 | |
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220 | // Enter the monitors in order |
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221 | __monitor_group group = {this.m, this.count, func}; |
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222 | enter( group ); |
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223 | } |
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224 | |
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225 | |
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226 | // Dtor for monitor guard |
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227 | void ^?{}( monitor_guard_t & this ) { |
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228 | // Leave the monitors in order |
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229 | leave( this.m, this.count ); |
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230 | |
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231 | // Restore thread context |
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232 | this_thread->monitors.list = this.prev_mntrs; |
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233 | this_thread->monitors.size = this.prev_count; |
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234 | this_thread->monitors.func = this.prev_func; |
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235 | } |
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236 | |
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237 | //----------------------------------------------------------------------------- |
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238 | // Internal scheduling types |
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239 | void ?{}(__condition_node_t & this, thread_desc * waiting_thread, unsigned short count, uintptr_t user_info ) { |
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240 | this.waiting_thread = waiting_thread; |
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241 | this.count = count; |
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242 | this.next = NULL; |
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243 | this.user_info = user_info; |
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244 | } |
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245 | |
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246 | void ?{}(__condition_criterion_t & this ) { |
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247 | this.ready = false; |
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248 | this.target = NULL; |
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249 | this.owner = NULL; |
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250 | this.next = NULL; |
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251 | } |
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252 | |
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253 | void ?{}(__condition_criterion_t & this, monitor_desc * target, __condition_node_t * owner ) { |
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254 | this.ready = false; |
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255 | this.target = target; |
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256 | this.owner = owner; |
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257 | this.next = NULL; |
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258 | } |
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259 | |
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260 | //----------------------------------------------------------------------------- |
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261 | // Internal scheduling |
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262 | void wait( condition * this, uintptr_t user_info = 0 ) { |
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263 | brand_condition( this ); |
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264 | |
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265 | // Check that everything is as expected |
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266 | assertf( this->monitors != NULL, "Waiting with no monitors (%p)", this->monitors ); |
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267 | verifyf( this->monitor_count != 0, "Waiting with 0 monitors (%i)", this->monitor_count ); |
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268 | verifyf( this->monitor_count < 32u, "Excessive monitor count (%i)", this->monitor_count ); |
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269 | |
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270 | // Create storage for monitor context |
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271 | monitor_ctx( this->monitors, this->monitor_count ); |
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272 | |
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273 | // Create the node specific to this wait operation |
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274 | wait_ctx( this_thread, user_info ); |
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275 | |
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276 | // Append the current wait operation to the ones already queued on the condition |
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277 | // We don't need locks for that since conditions must always be waited on inside monitor mutual exclusion |
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278 | append( &this->blocked, &waiter ); |
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279 | |
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280 | // Lock all monitors (aggregates the lock them as well) |
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281 | lock_all( monitors, locks, count ); |
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282 | |
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283 | // DON'T unlock, ask the kernel to do it |
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284 | |
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285 | // Save monitor state |
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286 | save_recursion( monitors, recursions, count ); |
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287 | |
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288 | // Find the next thread(s) to run |
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289 | unsigned short thread_count = 0; |
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290 | thread_desc * threads[ count ]; |
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291 | for(int i = 0; i < count; i++) { |
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292 | threads[i] = 0; |
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293 | } |
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294 | |
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295 | // Remove any duplicate threads |
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296 | for( int i = 0; i < count; i++) { |
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297 | thread_desc * new_owner = next_thread( monitors[i] ); |
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298 | thread_count = insert_unique( threads, thread_count, new_owner ); |
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299 | } |
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300 | |
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301 | // Everything is ready to go to sleep |
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302 | BlockInternal( locks, count, threads, thread_count ); |
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303 | |
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304 | |
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305 | // WE WOKE UP |
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306 | |
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307 | |
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308 | // We are back, restore the owners and recursions |
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309 | lock_all( locks, count ); |
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310 | restore_recursion( monitors, recursions, count ); |
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311 | unlock_all( locks, count ); |
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312 | } |
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313 | |
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314 | bool signal( condition * this ) { |
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315 | if( is_empty( this ) ) { return false; } |
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316 | |
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317 | //Check that everything is as expected |
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318 | verify( this->monitors ); |
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319 | verify( this->monitor_count != 0 ); |
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320 | |
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321 | //Some more checking in debug |
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322 | LIB_DEBUG_DO( |
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323 | thread_desc * this_thrd = this_thread; |
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324 | if ( this->monitor_count != this_thrd->monitors.size ) { |
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325 | abortf( "Signal on condition %p made with different number of monitor(s), expected %i got %i", this, this->monitor_count, this_thrd->monitors.size ); |
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326 | } |
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327 | |
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328 | for(int i = 0; i < this->monitor_count; i++) { |
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329 | if ( this->monitors[i] != this_thrd->monitors.list[i] ) { |
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330 | abortf( "Signal on condition %p made with different monitor, expected %p got %i", this, this->monitors[i], this_thrd->monitors.list[i] ); |
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331 | } |
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332 | } |
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333 | ); |
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334 | |
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335 | unsigned short count = this->monitor_count; |
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336 | |
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337 | // Lock all monitors |
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338 | lock_all( this->monitors, NULL, count ); |
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339 | |
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340 | //Pop the head of the waiting queue |
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341 | __condition_node_t * node = pop_head( &this->blocked ); |
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342 | |
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343 | //Add the thread to the proper AS stack |
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344 | for(int i = 0; i < count; i++) { |
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345 | __condition_criterion_t * crit = &node->criteria[i]; |
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346 | assert( !crit->ready ); |
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347 | push( &crit->target->signal_stack, crit ); |
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348 | } |
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349 | |
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350 | //Release |
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351 | unlock_all( this->monitors, count ); |
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352 | |
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353 | return true; |
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354 | } |
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355 | |
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356 | bool signal_block( condition * this ) { |
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357 | if( !this->blocked.head ) { return false; } |
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358 | |
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359 | //Check that everything is as expected |
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360 | verifyf( this->monitors != NULL, "Waiting with no monitors (%p)", this->monitors ); |
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361 | verifyf( this->monitor_count != 0, "Waiting with 0 monitors (%i)", this->monitor_count ); |
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362 | |
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363 | // Create storage for monitor context |
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364 | monitor_ctx( this->monitors, this->monitor_count ); |
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365 | |
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366 | // Lock all monitors (aggregates the locks them as well) |
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367 | lock_all( monitors, locks, count ); |
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368 | |
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369 | // Create the node specific to this wait operation |
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370 | wait_ctx_primed( this_thread, 0 ) |
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371 | |
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372 | //save contexts |
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373 | save_recursion( monitors, recursions, count ); |
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374 | |
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375 | //Find the thread to run |
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376 | thread_desc * signallee = pop_head( &this->blocked )->waiting_thread; |
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377 | for(int i = 0; i < count; i++) { |
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378 | set_owner( monitors[i], signallee ); |
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379 | } |
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380 | |
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381 | //Everything is ready to go to sleep |
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382 | BlockInternal( locks, count, &signallee, 1 ); |
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383 | |
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384 | |
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385 | // WE WOKE UP |
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386 | |
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387 | |
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388 | //We are back, restore the owners and recursions |
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389 | lock_all( locks, count ); |
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390 | restore_recursion( monitors, recursions, count ); |
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391 | unlock_all( locks, count ); |
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392 | |
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393 | return true; |
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394 | } |
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395 | |
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396 | // Access the user_info of the thread waiting at the front of the queue |
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397 | uintptr_t front( condition * this ) { |
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398 | verifyf( !is_empty(this), |
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399 | "Attempt to access user data on an empty condition.\n" |
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400 | "Possible cause is not checking if the condition is empty before reading stored data." |
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401 | ); |
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402 | return this->blocked.head->user_info; |
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403 | } |
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404 | |
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405 | //----------------------------------------------------------------------------- |
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406 | // External scheduling |
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407 | // cases to handle : |
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408 | // - target already there : |
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409 | // block and wake |
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410 | // - dtor already there |
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411 | // put thread on signaller stack |
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412 | // - non-blocking |
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413 | // return else |
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414 | // - timeout |
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415 | // return timeout |
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416 | // - block |
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417 | // setup mask |
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418 | // block |
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419 | int __waitfor_internal( unsigned short acc_count, __acceptable_t * acceptables, int duration ) { |
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420 | // This statment doesn't have a contiguous list of monitors... |
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421 | // Create one! |
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422 | short max = count_max( acc_count, acceptables ); |
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423 | monitor_desc * mon_storage[max]; |
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424 | short actual_count = aggregate( mon_storage, acc_count, acceptables ); |
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425 | |
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426 | // Create storage for monitor context |
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427 | monitor_ctx( mon_storage, actual_count ); |
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428 | |
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429 | // Lock all monitors (aggregates the lock them as well) |
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430 | lock_all( monitors, locks, count ); |
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431 | |
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432 | { |
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433 | // Check if the entry queue |
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434 | thread_desc * next; |
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435 | int index; |
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436 | [next, index] = search_entry_queue( acceptables, acc_count, monitors, count ); |
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437 | |
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438 | if( next ) { |
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439 | if( acceptables[index].is_dtor ) { |
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440 | #warning case not implemented |
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441 | } |
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442 | else { |
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443 | save_recursion( monitors, recursions, count ); |
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444 | |
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445 | // Everything is ready to go to sleep |
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446 | BlockInternal( locks, count, &next, 1 ); |
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447 | |
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448 | |
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449 | //WE WOKE UP |
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450 | |
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451 | |
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452 | //We are back, restore the owners and recursions |
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453 | lock_all( locks, count ); |
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454 | restore_recursion( monitors, recursions, count ); |
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455 | unlock_all( locks, count ); |
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456 | } |
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457 | |
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458 | return index; |
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459 | } |
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460 | } |
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461 | |
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462 | |
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463 | if( duration == 0 ) return -1; |
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464 | |
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465 | set_mask( monitors, count, acceptables, acc_count ); |
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466 | |
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467 | verifyf( duration < 0, "Timeout on waitfor statments not supported yet."); |
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468 | |
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469 | |
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470 | save_recursion( monitors, recursions, count ); |
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471 | |
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472 | |
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473 | // Everything is ready to go to sleep |
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474 | BlockInternal( locks, count ); |
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475 | |
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476 | |
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477 | //WE WOKE UP |
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478 | |
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479 | |
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480 | //We are back, restore the owners and recursions |
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481 | lock_all( locks, count ); |
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482 | restore_recursion( monitors, recursions, count ); |
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483 | int acc_idx = monitors[0]->accepted_index; |
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484 | unlock_all( locks, count ); |
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485 | |
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486 | return acc_idx; |
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487 | } |
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488 | |
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489 | //----------------------------------------------------------------------------- |
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490 | // Utilities |
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491 | |
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492 | static inline void set_owner( monitor_desc * this, thread_desc * owner ) { |
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493 | //Pass the monitor appropriately |
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494 | this->owner = owner; |
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495 | |
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496 | //We are passing the monitor to someone else, which means recursion level is not 0 |
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497 | this->recursion = owner ? 1 : 0; |
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498 | } |
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499 | |
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500 | static inline thread_desc * next_thread( monitor_desc * this ) { |
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501 | //Check the signaller stack |
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502 | __condition_criterion_t * urgent = pop( &this->signal_stack ); |
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503 | if( urgent ) { |
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504 | //The signaller stack is not empty, |
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505 | //regardless of if we are ready to baton pass, |
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506 | //we need to set the monitor as in use |
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507 | set_owner( this, urgent->owner->waiting_thread ); |
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508 | |
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509 | return check_condition( urgent ); |
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510 | } |
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511 | |
---|
512 | // No signaller thread |
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513 | // Get the next thread in the entry_queue |
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514 | thread_desc * new_owner = pop_head( &this->entry_queue ); |
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515 | set_owner( this, new_owner ); |
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516 | |
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517 | return new_owner; |
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518 | } |
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519 | |
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520 | static inline void init( int count, monitor_desc ** monitors, __condition_node_t * waiter, __condition_criterion_t * criteria ) { |
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521 | for(int i = 0; i < count; i++) { |
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522 | (criteria[i]){ monitors[i], waiter }; |
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523 | } |
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524 | |
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525 | waiter->criteria = criteria; |
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526 | } |
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527 | |
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528 | static inline void init_push( int count, monitor_desc ** monitors, __condition_node_t * waiter, __condition_criterion_t * criteria ) { |
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529 | for(int i = 0; i < count; i++) { |
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530 | (criteria[i]){ monitors[i], waiter }; |
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531 | push( &criteria[i].target->signal_stack, &criteria[i] ); |
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532 | } |
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533 | |
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534 | waiter->criteria = criteria; |
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535 | } |
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536 | |
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537 | static inline void lock_all( spinlock ** locks, unsigned short count ) { |
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538 | for( int i = 0; i < count; i++ ) { |
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539 | lock_yield( locks[i] DEBUG_CTX2 ); |
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540 | } |
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541 | } |
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542 | |
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543 | static inline void lock_all( monitor_desc ** source, spinlock ** /*out*/ locks, unsigned short count ) { |
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544 | for( int i = 0; i < count; i++ ) { |
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545 | spinlock * l = &source[i]->lock; |
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546 | lock_yield( l DEBUG_CTX2 ); |
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547 | if(locks) locks[i] = l; |
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548 | } |
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549 | } |
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550 | |
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551 | static inline void unlock_all( spinlock ** locks, unsigned short count ) { |
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552 | for( int i = 0; i < count; i++ ) { |
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553 | unlock( locks[i] ); |
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554 | } |
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555 | } |
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556 | |
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557 | static inline void unlock_all( monitor_desc ** locks, unsigned short count ) { |
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558 | for( int i = 0; i < count; i++ ) { |
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559 | unlock( &locks[i]->lock ); |
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560 | } |
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561 | } |
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562 | |
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563 | |
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564 | static inline void save_recursion ( monitor_desc ** ctx, unsigned int * /*out*/ recursions, unsigned short count ) { |
---|
565 | for( int i = 0; i < count; i++ ) { |
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566 | recursions[i] = ctx[i]->recursion; |
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567 | } |
---|
568 | } |
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569 | |
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570 | static inline void restore_recursion( monitor_desc ** ctx, unsigned int * /*in */ recursions, unsigned short count ) { |
---|
571 | for( int i = 0; i < count; i++ ) { |
---|
572 | ctx[i]->recursion = recursions[i]; |
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573 | } |
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574 | } |
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575 | |
---|
576 | // Function has 2 different behavior |
---|
577 | // 1 - Marks a monitors as being ready to run |
---|
578 | // 2 - Checks if all the monitors are ready to run |
---|
579 | // if so return the thread to run |
---|
580 | static inline thread_desc * check_condition( __condition_criterion_t * target ) { |
---|
581 | __condition_node_t * node = target->owner; |
---|
582 | unsigned short count = node->count; |
---|
583 | __condition_criterion_t * criteria = node->criteria; |
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584 | |
---|
585 | bool ready2run = true; |
---|
586 | |
---|
587 | for( int i = 0; i < count; i++ ) { |
---|
588 | |
---|
589 | // LIB_DEBUG_PRINT_SAFE( "Checking %p for %p\n", &criteria[i], target ); |
---|
590 | if( &criteria[i] == target ) { |
---|
591 | criteria[i].ready = true; |
---|
592 | // LIB_DEBUG_PRINT_SAFE( "True\n" ); |
---|
593 | } |
---|
594 | |
---|
595 | ready2run = criteria[i].ready && ready2run; |
---|
596 | } |
---|
597 | |
---|
598 | // LIB_DEBUG_PRINT_SAFE( "Runing %i\n", ready2run ); |
---|
599 | return ready2run ? node->waiting_thread : NULL; |
---|
600 | } |
---|
601 | |
---|
602 | static inline void brand_condition( condition * this ) { |
---|
603 | thread_desc * thrd = this_thread; |
---|
604 | if( !this->monitors ) { |
---|
605 | // LIB_DEBUG_PRINT_SAFE("Branding\n"); |
---|
606 | assertf( thrd->monitors.list != NULL, "No current monitor to brand condition %p", thrd->monitors.list ); |
---|
607 | this->monitor_count = thrd->monitors.size; |
---|
608 | |
---|
609 | this->monitors = malloc( this->monitor_count * sizeof( *this->monitors ) ); |
---|
610 | for( int i = 0; i < this->monitor_count; i++ ) { |
---|
611 | this->monitors[i] = thrd->monitors.list[i]; |
---|
612 | } |
---|
613 | } |
---|
614 | } |
---|
615 | |
---|
616 | static inline unsigned short insert_unique( thread_desc ** thrds, unsigned short end, thread_desc * val ) { |
---|
617 | if( !val ) return end; |
---|
618 | |
---|
619 | for(int i = 0; i <= end; i++) { |
---|
620 | if( thrds[i] == val ) return end; |
---|
621 | } |
---|
622 | |
---|
623 | thrds[end] = val; |
---|
624 | return end + 1; |
---|
625 | } |
---|
626 | |
---|
627 | static inline int is_accepted( thread_desc * owner, monitor_desc * this, const __monitor_group & group ) { |
---|
628 | __acceptable_t* accs = this->acceptables; // Optim |
---|
629 | int acc_cnt = this->acceptable_count; |
---|
630 | |
---|
631 | // Check if there are any acceptable functions |
---|
632 | if( !accs ) return -1; |
---|
633 | |
---|
634 | // If this isn't the first monitor to test this, there is no reason to repeat the test. |
---|
635 | if( this != group[0] ) return group[0]->accepted_index; |
---|
636 | |
---|
637 | // For all acceptable functions check if this is the current function. |
---|
638 | for( int i = 0; i < acc_cnt; i++ ) { |
---|
639 | __acceptable_t * acc = &accs[i]; |
---|
640 | |
---|
641 | if( acc->monitors == group ) return i; |
---|
642 | } |
---|
643 | |
---|
644 | // No function matched |
---|
645 | return -1; |
---|
646 | } |
---|
647 | |
---|
648 | static inline [thread_desc *, int] search_entry_queue( __acceptable_t * acceptables, int acc_count, monitor_desc ** monitors, int count ) { |
---|
649 | |
---|
650 | __thread_queue_t * entry_queue = &monitors[0]->entry_queue; |
---|
651 | |
---|
652 | // For each thread in the entry-queue |
---|
653 | for( thread_desc ** thrd_it = &entry_queue->head; |
---|
654 | *thrd_it; |
---|
655 | thrd_it = &(*thrd_it)->next) |
---|
656 | { |
---|
657 | // For each acceptable check if it matches |
---|
658 | int i; |
---|
659 | __acceptable_t * acc_end = acceptables + acc_count; |
---|
660 | for( __acceptable_t * acc_it = acceptables; acc_it != acc_end; acc_it++, i++ ) { |
---|
661 | // Check if we have a match |
---|
662 | if( acc_it->monitors == (*thrd_it)->monitors ) { |
---|
663 | |
---|
664 | // If we have a match return it |
---|
665 | // after removeing it from the entry queue |
---|
666 | return [remove( entry_queue, thrd_it ), i]; |
---|
667 | } |
---|
668 | } |
---|
669 | } |
---|
670 | |
---|
671 | return [0, -1]; |
---|
672 | } |
---|
673 | |
---|
674 | static inline short count_max( short acc_count, __acceptable_t * acceptables ) { |
---|
675 | short max = 0; |
---|
676 | for( int i = 0; i < acc_count; i++ ) { |
---|
677 | max += acceptables[i].monitors.size; |
---|
678 | } |
---|
679 | return max; |
---|
680 | } |
---|
681 | |
---|
682 | static inline short aggregate( monitor_desc ** storage, short count, __acceptable_t * acceptables ) { |
---|
683 | #warning function not implemented |
---|
684 | return 0; |
---|
685 | } |
---|
686 | |
---|
687 | static inline void set_mask( monitor_desc ** storage, short count, __acceptable_t * acceptables, short acc_count ) { |
---|
688 | for(int i = 0; i < count; i++) { |
---|
689 | storage[i]->acceptables = acceptables; |
---|
690 | storage[i]->acceptable_count = acc_count; |
---|
691 | storage[i]->accepted_index = -1; |
---|
692 | } |
---|
693 | } |
---|
694 | |
---|
695 | |
---|
696 | void ?{}( __condition_blocked_queue_t & this ) { |
---|
697 | this.head = NULL; |
---|
698 | this.tail = &this.head; |
---|
699 | } |
---|
700 | |
---|
701 | void append( __condition_blocked_queue_t * this, __condition_node_t * c ) { |
---|
702 | verify(this->tail != NULL); |
---|
703 | *this->tail = c; |
---|
704 | this->tail = &c->next; |
---|
705 | } |
---|
706 | |
---|
707 | __condition_node_t * pop_head( __condition_blocked_queue_t * this ) { |
---|
708 | __condition_node_t * head = this->head; |
---|
709 | if( head ) { |
---|
710 | this->head = head->next; |
---|
711 | if( !head->next ) { |
---|
712 | this->tail = &this->head; |
---|
713 | } |
---|
714 | head->next = NULL; |
---|
715 | } |
---|
716 | return head; |
---|
717 | } |
---|
718 | |
---|
719 | // Local Variables: // |
---|
720 | // mode: c // |
---|
721 | // tab-width: 4 // |
---|
722 | // End: // |
---|