Mercurial > cpython-lru_cache-weakref

annotate Python/thread_beos.h @ 16845:09dcf5ebcd80 legacy-trunk

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Now that Jeremy is asking about this code, it looks really bogus to me, so let's rip it out. The constructor for SyntaxError does the right thing, so we do not need to do it again.
author Fred Drake <fdrake@acm.org>
date Wed, 28 Feb 2001 20:58:04 +0000
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 )
9603
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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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diff changeset
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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diff changeset
252 int success;
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diff changeset
253 status_t retval;
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diff changeset
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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parents:
diff changeset
261 }
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diff changeset
262
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
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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parents:
diff changeset
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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Guido van Rossum <guido@python.org>
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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diff changeset
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));
9603
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diff changeset
280
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diff changeset
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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Guido van Rossum <guido@python.org>
parents:
diff changeset
284 return;
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parents:
diff changeset
285 }
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Guido van Rossum <guido@python.org>
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286 }
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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 }