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annotate Python/thread_beos.h @ 68231:5fd74354d73b 2.0

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Close 2.0 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:54:19 +0100
parents 6f6f965c5e2d
children ebfd87e87884
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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 int 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 sprintf( name, "python thread (%d)", this_thread );
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127
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128 tid = spawn_thread( (thread_func)func, name,
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129 B_NORMAL_PRIORITY, arg );
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130 if( tid > B_NO_ERROR ) {
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131 success = resume_thread( tid );
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132 }
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133
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134 return ( success == B_NO_ERROR ? 1 : 0 );
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135 }
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136
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137 long PyThread_get_thread_ident( void )
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138 {
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139 /* Presumed to return the current thread's ID... */
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140 thread_id tid;
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141 tid = find_thread( NULL );
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142
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143 return ( tid != B_NAME_NOT_FOUND ? tid : -1 );
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144 }
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145
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146 static void do_PyThread_exit_thread( int no_cleanup )
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147 {
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148 int32 threads;
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149
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150 dprintf(("PyThread_exit_thread called\n"));
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151
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152 /* Thread-safe way to read a variable without a mutex: */
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153 threads = atomic_add( &thread_count, 0 );
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154
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155 if( threads == 0 ) {
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156 /* No threads around, so exit main(). */
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157 if( no_cleanup ) {
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158 _exit(0);
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159 } else {
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160 exit(0);
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161 }
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162 } else {
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163 /* Oh, we're a thread, let's try to exit gracefully... */
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164 exit_thread( B_NO_ERROR );
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165 }
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166 }
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167
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168 void PyThread_exit_thread( void )
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169 {
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170 do_PyThread_exit_thread(0);
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171 }
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172
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173 void PyThread__exit_thread( void )
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174 {
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175 do_PyThread_exit_thread(1);
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176 }
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177
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178 #ifndef NO_EXIT_PROG
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179 static void do_PyThread_exit_prog( int status, int no_cleanup )
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180 {
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181 dprintf(("PyThread_exit_prog(%d) called\n", status));
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182
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183 /* No need to do anything, the threads get torn down if main() exits. */
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184
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185 if (no_cleanup) {
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186 _exit(status);
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187 } else {
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188 exit(status);
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189 }
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190 }
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191
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192 void PyThread_exit_prog( int status )
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193 {
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194 do_PyThread_exit_prog(status, 0);
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195 }
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196
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197 void PyThread__exit_prog( int status )
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198 {
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199 do_PyThread_exit_prog(status, 1);
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200 }
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201 #endif /* NO_EXIT_PROG */
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202
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203 /* ----------------------------------------------------------------------
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204 * Lock support.
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205 */
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206
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207 static int32 lock_count = 0;
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208
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209 PyThread_type_lock PyThread_allocate_lock( void )
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210 {
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211 benaphore_t *lock;
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212 status_t retval;
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213 char name[B_OS_NAME_LENGTH];
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214 int32 this_lock;
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215
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216 dprintf(("PyThread_allocate_lock called\n"));
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217
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218 lock = (benaphore_t *)malloc( sizeof( benaphore_t ) );
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219 if( lock == NULL ) {
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220 /* TODO: that's bad, raise MemoryError */
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221 return (PyThread_type_lock)NULL;
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222 }
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223
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224 this_lock = atomic_add( &lock_count, 1 );
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225 sprintf( name, "python lock (%d)", this_lock );
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226
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227 retval = benaphore_create( name, lock );
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228 if( retval != EOK ) {
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229 /* TODO: that's bad, raise an exception */
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230 return (PyThread_type_lock)NULL;
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231 }
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232
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233 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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234 return (PyThread_type_lock) lock;
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235 }
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236
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237 void PyThread_free_lock( PyThread_type_lock lock )
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238 {
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239 status_t retval;
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240
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241 dprintf(("PyThread_free_lock(%p) called\n", lock));
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242
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243 retval = benaphore_destroy( (benaphore_t *)lock );
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diff changeset
244 if( retval != EOK ) {
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diff changeset
245 /* TODO: that's bad, raise an exception */
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246 return;
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diff changeset
247 }
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248 }
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249
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250 int PyThread_acquire_lock( PyThread_type_lock lock, int waitflag )
9603
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251 {
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252 int success;
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253 status_t retval;
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254
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255 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
9603
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256
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diff changeset
257 if( waitflag ) {
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258 retval = benaphore_lock( (benaphore_t *)lock );
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diff changeset
259 } else {
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260 retval = benaphore_timedlock( (benaphore_t *)lock, 0 );
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diff changeset
261 }
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diff changeset
262
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diff changeset
263 if( retval == EOK ) {
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diff changeset
264 success = 1;
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diff changeset
265 } else {
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266 success = 0;
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parents:
diff changeset
267
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parents:
diff changeset
268 /* TODO: that's bad, raise an exception */
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parents:
diff changeset
269 }
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diff changeset
270
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271 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
9603
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272 return success;
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273 }
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274
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275 void PyThread_release_lock( PyThread_type_lock lock )
9603
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276 {
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diff changeset
277 status_t retval;
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diff changeset
278
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279 dprintf(("PyThread_release_lock(%p) called\n", lock));
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280
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281 retval = benaphore_unlock( (benaphore_t *)lock );
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parents:
diff changeset
282 if( retval != EOK ) {
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diff changeset
283 /* TODO: that's bad, raise an exception */
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parents:
diff changeset
284 return;
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diff changeset
285 }
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diff changeset
286 }
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Guido van Rossum <guido@python.org>
parents:
diff changeset
287
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288 /* ----------------------------------------------------------------------
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289 * Semaphore support.
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290 *
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291 * Guido says not to implement this because it's not used anywhere;
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292 * I'll do it anyway, you never know when it might be handy, and it's
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293 * easy...
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294 */
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295 PyThread_type_sema PyThread_allocate_sema( int value )
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296 {
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297 sem_id sema;
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298
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299 dprintf(("PyThread_allocate_sema called\n"));
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300
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301 sema = create_sem( value, "python semaphore" );
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302 if( sema < B_NO_ERROR ) {
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303 /* TODO: that's bad, raise an exception */
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304 return 0;
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305 }
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306
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307 dprintf(("PyThread_allocate_sema() -> %p\n", sema));
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308 return (PyThread_type_sema) sema;
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309 }
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310
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311 void PyThread_free_sema( PyThread_type_sema sema )
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312 {
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313 status_t retval;
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314
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315 dprintf(("PyThread_free_sema(%p) called\n", sema));
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316
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317 retval = delete_sem( (sem_id)sema );
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318 if( retval != B_NO_ERROR ) {
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319 /* TODO: that's bad, raise an exception */
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320 return;
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321 }
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322 }
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323
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324 int PyThread_down_sema( PyThread_type_sema sema, int waitflag )
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325 {
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326 status_t retval;
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327
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328 dprintf(("PyThread_down_sema(%p, %d) called\n", sema, waitflag));
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329
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330 if( waitflag ) {
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331 retval = acquire_sem( (sem_id)sema );
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332 } else {
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333 retval = acquire_sem_etc( (sem_id)sema, 1, B_TIMEOUT, 0 );
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334 }
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335
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336 if( retval != B_NO_ERROR ) {
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337 /* TODO: that's bad, raise an exception */
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338 return 0;
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339 }
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340
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341 dprintf(("PyThread_down_sema(%p) return\n", sema));
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342 return -1;
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343 }
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344
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345 void PyThread_up_sema( PyThread_type_sema sema )
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346 {
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347 status_t retval;
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348
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349 dprintf(("PyThread_up_sema(%p)\n", sema));
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350
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351 retval = release_sem( (sem_id)sema );
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352 if( retval != B_NO_ERROR ) {
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353 /* TODO: that's bad, raise an exception */
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354 return;
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355 }
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356 }