Mercurial > cpython-lru_cache-weakref

annotate Python/thread_beos.h @ 57673:20b7deb53d4e legacy-trunk

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account for PyObject_IsInstance's new ability to fail
author Benjamin Peterson <benjamin@python.org>
date Sun, 13 Dec 2009 00:54:15 +0000
parents 8b116a8449bd
children e38335d4df91 df5719c298db
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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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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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diff changeset
204 /* ----------------------------------------------------------------------
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Guido van Rossum <guido@python.org>
parents:
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205 * Lock support.
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Guido van Rossum <guido@python.org>
parents:
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206 */
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parents:
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207
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Guido van Rossum <guido@python.org>
parents:
diff changeset
208 static int32 lock_count = 0;
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parents:
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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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Guido van Rossum <guido@python.org>
parents:
diff changeset
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>
parents:
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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diff changeset
216
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Guido van Rossum <guido@python.org>
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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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Guido van Rossum <guido@python.org>
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 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
224
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Guido van Rossum <guido@python.org>
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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diff changeset
227
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Guido van Rossum <guido@python.org>
parents:
diff changeset
228 retval = benaphore_create( name, lock );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
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
877d23bd5bdc Thanks to Chris Herborth, the thread primitives now have proper Py*
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 );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
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;
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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:
diff changeset
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:
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