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annotate Python/thread_beos.h @ 22621:830c829a7eb2 legacy-trunk

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Fix an issue that was reported in but unrelated to the main problem of SF bug 535905 (Evil Trashcan and GC interaction). The SETLOCAL() macro should not DECREF the local variable in-place and then store the new value; it should copy the old value to a temporary value, then store the new value, and then DECREF the temporary value. This is because it is possible that during the DECREF the frame is accessed by other code (e.g. a __del__ method or gc.collect()) and the variable would be pointing to already-freed memory. BUGFIX CANDIDATE!
author Guido van Rossum <guido@python.org>
date Thu, 28 Mar 2002 20:17:52 +0000
parents 8b116a8449bd
children e38335d4df91 df5719c298db
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1 #include <kernel/OS.h>
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2 #include <support/SupportDefs.h>
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3 #include <errno.h>
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4
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5 /* ----------------------------------------------------------------------
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6 * Fast locking mechanism described by Benoit Schillings (benoit@be.com)
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7 * in the Be Developer's Newsletter, Issue #26 (http://www.be.com/).
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8 */
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9 typedef struct benaphore {
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10 sem_id _sem;
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11 int32 _atom;
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12 } benaphore_t;
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13
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14 static status_t benaphore_create( const char *name, benaphore_t *ben );
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15 static status_t benaphore_destroy( benaphore_t *ben );
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16 static status_t benaphore_lock( benaphore_t *ben );
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17 static status_t benaphore_timedlock( benaphore_t *ben, bigtime_t micros );
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18 static status_t benaphore_unlock( benaphore_t *ben );
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19
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20 static status_t benaphore_create( const char *name, benaphore_t *ben )
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21 {
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22 if( ben != NULL ) {
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23 ben->_atom = 0;
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24 ben->_sem = create_sem( 0, name );
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25
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26 if( ben->_sem < B_NO_ERROR ) {
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27 return B_BAD_SEM_ID;
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28 }
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29 } else {
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30 return EFAULT;
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31 }
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32
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33 return EOK;
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34 }
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35
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36 static status_t benaphore_destroy( benaphore_t *ben )
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37 {
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38 if( ben->_sem >= B_NO_ERROR ) {
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39 status_t retval = benaphore_timedlock( ben, 0 );
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40
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41 if( retval == EOK || retval == EWOULDBLOCK ) {
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42 status_t del_retval = delete_sem( ben->_sem );
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43
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44 return del_retval;
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45 }
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46 }
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47
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48 return B_BAD_SEM_ID;
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49 }
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50
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51 static status_t benaphore_lock( benaphore_t *ben )
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52 {
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53 int32 prev = atomic_add( &(ben->_atom), 1 );
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54
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55 if( prev > 0 ) {
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56 return acquire_sem( ben->_sem );
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57 }
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58
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59 return EOK;
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60 }
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61
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62 static status_t benaphore_timedlock( benaphore_t *ben, bigtime_t micros )
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63 {
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64 int32 prev = atomic_add( &(ben->_atom), 1 );
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65
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66 if( prev > 0 ) {
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67 status_t retval = acquire_sem_etc( ben->_sem, 1, B_TIMEOUT, micros );
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68
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69 switch( retval ) {
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70 case B_WOULD_BLOCK: /* Fall through... */
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71 case B_TIMED_OUT:
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72 return EWOULDBLOCK;
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73 break;
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74 case B_OK:
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75 return EOK;
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76 break;
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77 default:
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78 return retval;
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79 break;
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80 }
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81 }
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82
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83 return EOK;
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84 }
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85
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86 static status_t benaphore_unlock( benaphore_t *ben )
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87 {
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88 int32 prev = atomic_add( &(ben->_atom), -1 );
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89
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90 if( prev > 1 ) {
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91 return release_sem( ben->_sem );
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92 }
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93
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94 return EOK;
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95 }
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96
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97 /* ----------------------------------------------------------------------
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98 * Initialization.
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99 */
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100 static void PyThread__init_thread( void )
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101 {
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102 /* Do nothing. */
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103 return;
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104 }
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105
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106 /* ----------------------------------------------------------------------
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107 * Thread support.
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108 *
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109 * Only ANSI C, renamed functions here; you can't use K&R on BeOS,
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110 * and there's no legacy thread module to support.
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111 */
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112
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113 static int32 thread_count = 0;
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114
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115 long PyThread_start_new_thread( void (*func)(void *), void *arg )
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116 {
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117 status_t success = 0;
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118 thread_id tid;
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119 char name[B_OS_NAME_LENGTH];
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120 int32 this_thread;
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121
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122 dprintf(("PyThread_start_new_thread called\n"));
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123
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124 /* We are so very thread-safe... */
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125 this_thread = atomic_add( &thread_count, 1 );
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126 PyOS_snprintf(name, sizeof(name),
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127 "python thread (%d)", this_thread );
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128
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129 tid = spawn_thread( (thread_func)func, name,
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130 B_NORMAL_PRIORITY, arg );
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131 if( tid > B_NO_ERROR ) {
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132 success = resume_thread( tid );
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133 }
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134
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135 return ( success == B_NO_ERROR ? tid : -1 );
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136 }
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137
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138 long PyThread_get_thread_ident( void )
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139 {
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140 /* Presumed to return the current thread's ID... */
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141 thread_id tid;
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142 tid = find_thread( NULL );
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143
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144 return ( tid != B_NAME_NOT_FOUND ? tid : -1 );
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145 }
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146
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147 static void do_PyThread_exit_thread( int no_cleanup )
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148 {
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149 int32 threads;
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150
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151 dprintf(("PyThread_exit_thread called\n"));
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152
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153 /* Thread-safe way to read a variable without a mutex: */
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154 threads = atomic_add( &thread_count, 0 );
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155
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156 if( threads == 0 ) {
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157 /* No threads around, so exit main(). */
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158 if( no_cleanup ) {
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159 _exit(0);
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160 } else {
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161 exit(0);
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162 }
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163 } else {
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164 /* Oh, we're a thread, let's try to exit gracefully... */
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165 exit_thread( B_NO_ERROR );
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166 }
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167 }
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168
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169 void PyThread_exit_thread( void )
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170 {
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171 do_PyThread_exit_thread(0);
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172 }
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173
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174 void PyThread__exit_thread( void )
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175 {
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176 do_PyThread_exit_thread(1);
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177 }
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178
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179 #ifndef NO_EXIT_PROG
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180 static void do_PyThread_exit_prog( int status, int no_cleanup )
9603
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181 {
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Guido van Rossum <guido@python.org>
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182 dprintf(("PyThread_exit_prog(%d) called\n", status));
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183
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184 /* No need to do anything, the threads get torn down if main() exits. */
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185
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186 if (no_cleanup) {
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187 _exit(status);
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188 } else {
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189 exit(status);
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190 }
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191 }
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192
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193 void PyThread_exit_prog( int status )
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Guido van Rossum <guido@python.org>
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194 {
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195 do_PyThread_exit_prog(status, 0);
9603
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196 }
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197
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198 void PyThread__exit_prog( int status )
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199 {
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200 do_PyThread_exit_prog(status, 1);
9603
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201 }
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202 #endif /* NO_EXIT_PROG */
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203
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204 /* ----------------------------------------------------------------------
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205 * Lock support.
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206 */
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parents:
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207
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parents:
diff changeset
208 static int32 lock_count = 0;
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209
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Guido van Rossum <guido@python.org>
parents: 9603
diff changeset
210 PyThread_type_lock PyThread_allocate_lock( void )
9603
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parents:
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211 {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
212 benaphore_t *lock;
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Guido van Rossum <guido@python.org>
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diff changeset
213 status_t retval;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
214 char name[B_OS_NAME_LENGTH];
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Guido van Rossum <guido@python.org>
parents:
diff changeset
215 int32 this_lock;
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216
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diff changeset
217 dprintf(("PyThread_allocate_lock called\n"));
9603
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218
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diff changeset
219 lock = (benaphore_t *)malloc( sizeof( benaphore_t ) );
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parents:
diff changeset
220 if( lock == NULL ) {
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parents:
diff changeset
221 /* TODO: that's bad, raise MemoryError */
9679
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Guido van Rossum <guido@python.org>
parents: 9603
diff changeset
222 return (PyThread_type_lock)NULL;
9603
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223 }
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parents:
diff changeset
224
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parents:
diff changeset
225 this_lock = atomic_add( &lock_count, 1 );
21094
c2150313d9d1 More sprintf -> PyOS_snprintf.
Tim Peters <tim.peters@gmail.com>
parents: 20468
diff changeset
226 PyOS_snprintf(name, sizeof(name), "python lock (%d)", this_lock);
9603
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227
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Guido van Rossum <guido@python.org>
parents:
diff changeset
228 retval = benaphore_create( name, lock );
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Guido van Rossum <guido@python.org>
parents:
diff changeset
229 if( retval != EOK ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
230 /* TODO: that's bad, raise an exception */
9679
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Guido van Rossum <guido@python.org>
parents: 9603
diff changeset
231 return (PyThread_type_lock)NULL;
9603
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Guido van Rossum <guido@python.org>
parents:
diff changeset
232 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
233
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 9679
diff changeset
234 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9603
diff changeset
235 return (PyThread_type_lock) lock;
9603
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
236 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
237
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9603
diff changeset
238 void PyThread_free_lock( PyThread_type_lock lock )
9603
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
239 {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
240 status_t retval;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
241
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 9679
diff changeset
242 dprintf(("PyThread_free_lock(%p) called\n", lock));
9603
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Guido van Rossum <guido@python.org>
parents:
diff changeset
243
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
244 retval = benaphore_destroy( (benaphore_t *)lock );
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Guido van Rossum <guido@python.org>
parents:
diff changeset
245 if( retval != EOK ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
246 /* TODO: that's bad, raise an exception */
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
247 return;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
248 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
249 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
250
9679
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
Guido van Rossum <guido@python.org>
parents: 9603
diff changeset
251 int PyThread_acquire_lock( PyThread_type_lock lock, int waitflag )
9603
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Guido van Rossum <guido@python.org>
parents:
diff changeset
252 {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
253 int success;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
254 status_t retval;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
255
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 9679
diff changeset
256 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
9603
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
257
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
258 if( waitflag ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
259 retval = benaphore_lock( (benaphore_t *)lock );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
260 } else {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
261 retval = benaphore_timedlock( (benaphore_t *)lock, 0 );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
262 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
263
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
264 if( retval == EOK ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
265 success = 1;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
266 } else {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
267 success = 0;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
268
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
269 /* TODO: that's bad, raise an exception */
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
270 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
271
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 9679
diff changeset
272 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
9603
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Guido van Rossum <guido@python.org>
parents:
diff changeset
273 return success;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
274 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
275
9679
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Guido van Rossum <guido@python.org>
parents: 9603
diff changeset
276 void PyThread_release_lock( PyThread_type_lock lock )
9603
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Guido van Rossum <guido@python.org>
parents:
diff changeset
277 {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
278 status_t retval;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
279
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 9679
diff changeset
280 dprintf(("PyThread_release_lock(%p) called\n", lock));
9603
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Guido van Rossum <guido@python.org>
parents:
diff changeset
281
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
282 retval = benaphore_unlock( (benaphore_t *)lock );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
283 if( retval != EOK ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
284 /* TODO: that's bad, raise an exception */
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
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285 return;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
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286 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
287 }