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132
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1 /**
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2 * D header file for POSIX.
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3 *
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4 * Copyright: Public Domain
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5 * License: Public Domain
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6 * Authors: Sean Kelly
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7 * Standards: The Open Group Base Specifications Issue 6, IEEE Std 1003.1, 2004 Edition
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8 */
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9 module tango.stdc.posix.pthread;
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10
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11 public import tango.stdc.posix.sys.types;
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12 public import tango.stdc.posix.sched;
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13 public import tango.stdc.posix.time;
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14 private import tango.stdc.stdlib;
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15
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16 extern (C):
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17
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18 //
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19 // Required
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20 //
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21
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22 version( darwin )
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23 {
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24 int pthread_cond_broadcast(pthread_cond_t*);
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25 int pthread_cond_destroy(pthread_cond_t*);
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26 int pthread_cond_init(pthread_cond_t*, pthread_condattr_t*);
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27 //int pthread_cond_signal(pthread_cond_t*);
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28 //int pthread_cond_timedwait(pthread_cond_t*, pthread_mutex_t*, timespec*);
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29 int pthread_cond_wait(pthread_cond_t*, pthread_mutex_t*);
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30
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31 int pthread_mutex_destroy(pthread_mutex_t*);
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32 int pthread_mutex_init(pthread_mutex_t*, pthread_mutexattr_t*);
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33 int pthread_mutex_lock(pthread_mutex_t*);
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34 int pthread_mutex_trylock(pthread_mutex_t*);
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35 int pthread_mutex_unlock(pthread_mutex_t*);
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36
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37 //int pthread_rwlock_destroy(pthread_rwlock_t*);
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38 //int pthread_rwlock_init(pthread_rwlock_t*, pthread_rwlockattr_t*);
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39 //int pthread_rwlock_rdlock(pthread_rwlock_t*);
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40 int pthread_rwlock_tryrdlock(pthread_rwlock_t*);
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41 int pthread_rwlock_trywrlock(pthread_rwlock_t*);
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42 //int pthread_rwlock_unlock(pthread_rwlock_t*);
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43 //int pthread_rwlock_wrlock(pthread_rwlock_t*);
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44 }
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45
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46 //
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47 // Barrier (BAR)
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48 //
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49 /*
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50 PTHREAD_BARRIER_SERIAL_THREAD
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51
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52 int pthread_barrier_destroy(pthread_barrier_t*);
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53 int pthread_barrier_init(pthread_barrier_t*, pthread_barrierattr_t*, uint);
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54 int pthread_barrier_wait(pthread_barrier_t*);
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55 int pthread_barrierattr_destroy(pthread_barrierattr_t*);
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56 int pthread_barrierattr_getpshared(pthread_barrierattr_t*, int*); (BAR|TSH)
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57 int pthread_barrierattr_init(pthread_barrierattr_t*);
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58 int pthread_barrierattr_setpshared(pthread_barrierattr_t*, int); (BAR|TSH)
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59 */
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60
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61 version( darwin )
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62 {
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63 const PTHREAD_BARRIER_SERIAL_THREAD = -1;
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64
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65 // defined in tango.stdc.posix.pthread and redefined here
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66 enum
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67 {
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68 PTHREAD_PROCESS_PRIVATE,
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69 PTHREAD_PROCESS_SHARED
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70 }
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71
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72 int pthread_barrier_destroy( pthread_barrier_t* barrier )
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73 {
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74 if( barrier is null )
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75 return EINVAL;
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76 if( barrier.b_waiters > 0 )
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77 return EBUSY;
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78 int mret = pthread_mutex_destroy( &barrier.b_lock );
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79 int cret = pthread_cond_destroy( &barrier.b_cond );
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80 free( barrier );
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81 return mret ? mret : cret;
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82 }
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83
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84 int pthread_barrier_init( pthread_barrier_t* barrier,
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85 pthread_barrierattr_t* attr,
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86 uint count )
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87 {
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88 if( barrier is null || count <= 0 )
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89 return EINVAL;
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90
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91 pthread_barrier_t* newbarrier = cast(pthread_barrier_t*)
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92 malloc( pthread_barrier_t.sizeof );
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93 if( newbarrier is null )
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94 return ENOMEM;
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95
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96 int ret;
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97 if( ( ret = pthread_mutex_init( &newbarrier.b_lock, null ) ) != 0 )
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98 {
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99 free( newbarrier );
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100 return ret;
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101 }
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102 if( ( ret = pthread_cond_init( &newbarrier.b_cond, null ) ) != 0 )
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103 {
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104 pthread_mutex_destroy( &newbarrier.b_lock );
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105 free( newbarrier );
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106 return ret;
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107 }
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108 newbarrier.b_waiters = 0;
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109 newbarrier.b_count = count;
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110 newbarrier.b_generation = 0;
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111 *barrier = *newbarrier;
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112
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113 return 0;
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114 }
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115
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116 int pthread_barrier_wait( pthread_barrier_t* barrier )
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117 {
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118 if( barrier is null )
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119 return EINVAL;
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120
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121 int ret;
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122 if( ( ret = pthread_mutex_lock( &barrier.b_lock ) ) != 0 )
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123 return ret;
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124
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125 if( ++barrier.b_waiters == barrier.b_count )
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126 {
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127 // current thread is lastest thread
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128 barrier.b_generation++;
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129 barrier.b_waiters = 0;
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130 if( ( ret = pthread_cond_broadcast( &barrier.b_cond ) ) == 0 )
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131 ret = PTHREAD_BARRIER_SERIAL_THREAD;
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132 }
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133 else
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134 {
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135 int gen = barrier.b_generation;
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136 do
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137 {
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138 ret = pthread_cond_wait( &barrier.b_cond, &barrier.b_lock );
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139 // test generation to avoid bogus wakeup
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140 } while( ret == 0 && gen == barrier.b_generation );
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141 }
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142 pthread_mutex_unlock( &barrier.b_lock );
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143 return ret;
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144 }
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145
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146 int pthread_barrierattr_destroy( pthread_barrierattr_t* attr )
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147 {
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148 if( attr is null )
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149 return EINVAL;
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150 free( attr );
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151 return 0;
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152 }
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153
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154 int pthread_barrierattr_getpshared( pthread_barrierattr_t* attr, int* pshared )
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155 {
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156 if( attr is null )
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157 return EINVAL;
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158 *pshared = attr.pshared;
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159 return 0;
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160 }
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161
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162 int pthread_barrierattr_init( pthread_barrierattr_t* attr )
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163 {
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164 if( attr is null )
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165 return EINVAL;
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166 if( ( attr = cast(pthread_barrierattr_t*)
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167 malloc( pthread_barrierattr_t.sizeof ) ) is null )
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168 return ENOMEM;
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169 attr.pshared = PTHREAD_PROCESS_PRIVATE;
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170 return 0;
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171 }
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172
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173 int pthread_barrierattr_setpshared( pthread_barrierattr_t* attr, int pshared )
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174 {
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175 if( attr is null )
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176 return EINVAL;
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177 // only PTHREAD_PROCESS_PRIVATE is supported
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178 if( pshared != PTHREAD_PROCESS_PRIVATE )
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179 return EINVAL;
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180 attr.pshared = pshared;
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181 return 0;
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182 }
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183 }
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184
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185 //
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186 // Timeouts (TMO)
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187 //
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188 /*
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189 int pthread_mutex_timedlock(pthread_mutex_t*, timespec*);
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190 int pthread_rwlock_timedrdlock(pthread_rwlock_t*, timespec*);
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191 int pthread_rwlock_timedwrlock(pthread_rwlock_t*, timespec*);
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192 */
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193
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194 version( darwin )
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195 {
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196 private
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197 {
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198 import tango.stdc.errno;
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199 import tango.stdc.posix.unistd;
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200 import tango.stdc.posix.sys.time;
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201
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202 extern (D)
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203 {
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204 void timerclear( timeval* tvp )
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205 {
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206 tvp.tv_sec = tvp.tv_usec = 0;
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207 }
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208
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209 bool timerisset( timeval* tvp )
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210 {
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211 return tvp.tv_sec || tvp.tv_usec;
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212 }
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213
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214 bool timer_cmp_leq( timeval* tvp, timeval* uvp )
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215 {
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216 return tvp.tv_sec == uvp.tv_sec ?
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217 tvp.tv_usec <= uvp.tv_usec :
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218 tvp.tv_sec <= uvp.tv_sec;
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219 }
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220
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221 void timeradd( timeval* tvp, timeval* uvp, timeval* vvp )
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222 {
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223 vvp.tv_sec = tvp.tv_sec + uvp.tv_sec;
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224 vvp.tv_usec = tvp.tv_usec + uvp.tv_usec;
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225 if( vvp.tv_usec >= 1000000 )
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226 {
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227 vvp.tv_sec++;
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228 vvp.tv_usec -= 1000000;
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229 }
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230 }
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231
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232 void timersub( timeval* tvp, timeval* uvp, timeval* vvp )
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233 {
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234 vvp.tv_sec = tvp.tv_sec - uvp.tv_sec;
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235 vvp.tv_usec = tvp.tv_usec - uvp.tv_usec;
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236 if( vvp.tv_usec < 0 )
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237 {
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238 vvp.tv_sec--;
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239 vvp.tv_usec += 1000000;
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240 }
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241 }
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242
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243 void TIMEVAL_TO_TIMESPEC( timeval* tv, timespec* ts )
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244 {
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245 ts.tv_sec = tv.tv_sec;
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246 ts.tv_nsec = tv.tv_usec * 1000;
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247 }
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248
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249 void TIMESPEC_TO_TIMEVAL( timeval* tv, timespec* ts )
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250 {
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251 tv.tv_sec = ts.tv_sec;
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252 tv.tv_usec = ts.tv_nsec / 1000;
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253 }
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254 }
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255 }
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256
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257 int pthread_mutex_timedlock( pthread_mutex_t* m, timespec* t )
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258 {
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259 timeval currtime;
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260 timeval maxwait;
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261 TIMESPEC_TO_TIMEVAL( &maxwait, t );
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262 timeval waittime;
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263 waittime.tv_usec = 100;
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264
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265 while( timer_cmp_leq( &currtime, &maxwait ) )
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266 {
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267 int ret = pthread_mutex_trylock( m );
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268 switch( ret )
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269 {
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270 case 0: // locked successfully
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271 return ret;
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272 case EBUSY: // waiting
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273 timeradd( &currtime, &waittime, &currtime );
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274 break;
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275 default:
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276 return ret;
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277 }
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278 usleep( waittime.tv_usec );
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279 }
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280 return ETIMEDOUT;
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281 }
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282
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283 int pthread_rwlock_timedrdlock( pthread_rwlock_t *rwlock, timespec* t )
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284 {
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285 timeval currtime;
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286 timeval maxwait;
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287 TIMESPEC_TO_TIMEVAL( &maxwait, t );
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288 timeval waittime;
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289 waittime.tv_usec = 100;
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290
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291 while( timer_cmp_leq( &currtime, &maxwait ) )
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292 {
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293 int ret = pthread_rwlock_tryrdlock( rwlock );
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294 switch( ret )
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295 {
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296 case 0: // locked successfully
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297 return ret;
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298 case EBUSY: // waiting
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299 timeradd( &currtime, &waittime, &currtime );
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300 break;
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301 default:
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302 return ret;
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303 }
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304 usleep( waittime.tv_usec );
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305 }
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306 return ETIMEDOUT;
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307 }
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308
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309 int pthread_rwlock_timedwrlock( pthread_rwlock_t* l, timespec* t )
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310 {
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311 timeval currtime;
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312 timeval maxwait;
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313 TIMESPEC_TO_TIMEVAL( &maxwait, t );
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314 timeval waittime;
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315 waittime.tv_usec = 100;
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316
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317 while( timer_cmp_leq( &currtime, &maxwait ) )
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318 {
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319 int ret = pthread_rwlock_trywrlock( l );
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320 switch( ret )
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321 {
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322 case 0: // locked successfully
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323 return ret;
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324 case EBUSY: // waiting
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325 timeradd( &currtime, &waittime, &currtime );
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326 break;
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327 default:
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328 return ret;
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329 }
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330 usleep( waittime.tv_usec );
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331 }
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332 return ETIMEDOUT;
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333 }
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334 }
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