Mercurial > cpython-lru_cache-weakref

annotate Python/thread_beos.h @ 14103:f657dc8ff25e legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Thomas reminds me to bump the MAGIC number for the extended print opcode additions.
author Barry Warsaw <barry@python.org>
date Mon, 21 Aug 2000 16:35:06 +0000
parents 87ee82e5c56d
children 6f6f965c5e2d
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 BeOS thread support by Chris Herborth (chrish@qnx.com)
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10 ******************************************************************/
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11
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12 #include <kernel/OS.h>
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13 #include <support/SupportDefs.h>
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14 #include <errno.h>
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15
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16 /* ----------------------------------------------------------------------
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17 * Fast locking mechanism described by Benoit Schillings (benoit@be.com)
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18 * in the Be Developer's Newsletter, Issue #26 (http://www.be.com/).
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19 */
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20 typedef struct benaphore {
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21 sem_id _sem;
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22 int32 _atom;
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23 } benaphore_t;
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24
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25 static status_t benaphore_create( const char *name, benaphore_t *ben );
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26 static status_t benaphore_destroy( benaphore_t *ben );
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27 static status_t benaphore_lock( benaphore_t *ben );
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28 static status_t benaphore_timedlock( benaphore_t *ben, bigtime_t micros );
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29 static status_t benaphore_unlock( benaphore_t *ben );
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30
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31 static status_t benaphore_create( const char *name, benaphore_t *ben )
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32 {
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33 if( ben != NULL ) {
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34 ben->_atom = 0;
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35 ben->_sem = create_sem( 0, name );
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36
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37 if( ben->_sem < B_NO_ERROR ) {
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38 return B_BAD_SEM_ID;
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39 }
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40 } else {
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41 return EFAULT;
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42 }
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43
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44 return EOK;
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45 }
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46
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47 static status_t benaphore_destroy( benaphore_t *ben )
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48 {
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49 if( ben->_sem >= B_NO_ERROR ) {
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50 status_t retval = benaphore_timedlock( ben, 0 );
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51
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52 if( retval == EOK || retval == EWOULDBLOCK ) {
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53 status_t del_retval = delete_sem( ben->_sem );
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54
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55 return del_retval;
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56 }
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57 }
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58
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59 return B_BAD_SEM_ID;
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60 }
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61
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62 static status_t benaphore_lock( benaphore_t *ben )
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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 return acquire_sem( ben->_sem );
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68 }
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69
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70 return EOK;
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71 }
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72
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73 static status_t benaphore_timedlock( benaphore_t *ben, bigtime_t micros )
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74 {
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75 int32 prev = atomic_add( &(ben->_atom), 1 );
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76
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77 if( prev > 0 ) {
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78 status_t retval = acquire_sem_etc( ben->_sem, 1, B_TIMEOUT, micros );
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79
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80 switch( retval ) {
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81 case B_WOULD_BLOCK: /* Fall through... */
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82 case B_TIMED_OUT:
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83 return EWOULDBLOCK;
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84 break;
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85 case B_OK:
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86 return EOK;
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87 break;
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88 default:
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89 return retval;
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90 break;
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91 }
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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 static status_t benaphore_unlock( benaphore_t *ben )
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98 {
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99 int32 prev = atomic_add( &(ben->_atom), -1 );
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100
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101 if( prev > 1 ) {
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102 return release_sem( ben->_sem );
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103 }
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104
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105 return EOK;
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106 }
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107
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108 /* ----------------------------------------------------------------------
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109 * Initialization.
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110 */
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111 static void PyThread__init_thread( void )
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112 {
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113 /* Do nothing. */
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114 return;
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115 }
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116
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117 /* ----------------------------------------------------------------------
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118 * Thread support.
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119 *
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120 * Only ANSI C, renamed functions here; you can't use K&R on BeOS,
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121 * and there's no legacy thread module to support.
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122 */
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123
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124 static int32 thread_count = 0;
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125
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126 int PyThread_start_new_thread( void (*func)(void *), void *arg )
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127 {
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128 status_t success = 0;
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129 thread_id tid;
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130 char name[B_OS_NAME_LENGTH];
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131 int32 this_thread;
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132
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133 dprintf(("PyThread_start_new_thread called\n"));
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134
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135 /* We are so very thread-safe... */
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136 this_thread = atomic_add( &thread_count, 1 );
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137 sprintf( name, "python thread (%d)", this_thread );
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138
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139 tid = spawn_thread( (thread_func)func, name,
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140 B_NORMAL_PRIORITY, arg );
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141 if( tid > B_NO_ERROR ) {
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142 success = resume_thread( tid );
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143 }
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144
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145 return ( success == B_NO_ERROR ? 1 : 0 );
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146 }
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147
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148 long PyThread_get_thread_ident( void )
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149 {
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150 /* Presumed to return the current thread's ID... */
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151 thread_id tid;
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152 tid = find_thread( NULL );
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153
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154 return ( tid != B_NAME_NOT_FOUND ? tid : -1 );
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155 }
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156
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157 static void do_PyThread_exit_thread( int no_cleanup )
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158 {
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159 int32 threads;
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160
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161 dprintf(("PyThread_exit_thread called\n"));
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162
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163 /* Thread-safe way to read a variable without a mutex: */
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164 threads = atomic_add( &thread_count, 0 );
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165
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166 if( threads == 0 ) {
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167 /* No threads around, so exit main(). */
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168 if( no_cleanup ) {
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169 _exit(0);
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170 } else {
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171 exit(0);
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172 }
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173 } else {
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174 /* Oh, we're a thread, let's try to exit gracefully... */
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175 exit_thread( B_NO_ERROR );
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176 }
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177 }
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178
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179 void PyThread_exit_thread( void )
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180 {
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181 do_PyThread_exit_thread(0);
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182 }
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183
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184 void PyThread__exit_thread( void )
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185 {
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186 do_PyThread_exit_thread(1);
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187 }
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188
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189 #ifndef NO_EXIT_PROG
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190 static void do_PyThread_exit_prog( int status, int no_cleanup )
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191 {
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192 dprintf(("PyThread_exit_prog(%d) called\n", status));
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193
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194 /* No need to do anything, the threads get torn down if main() exits. */
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195
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196 if (no_cleanup) {
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197 _exit(status);
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198 } else {
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199 exit(status);
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200 }
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201 }
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202
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203 void PyThread_exit_prog( int status )
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204 {
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205 do_PyThread_exit_prog(status, 0);
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206 }
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207
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208 void PyThread__exit_prog( int status )
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209 {
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210 do_PyThread_exit_prog(status, 1);
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211 }
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212 #endif /* NO_EXIT_PROG */
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213
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214 /* ----------------------------------------------------------------------
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215 * Lock support.
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216 */
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217
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218 static int32 lock_count = 0;
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219
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220 PyThread_type_lock PyThread_allocate_lock( void )
9603
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221 {
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222 benaphore_t *lock;
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223 status_t retval;
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224 char name[B_OS_NAME_LENGTH];
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225 int32 this_lock;
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226
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227 dprintf(("PyThread_allocate_lock called\n"));
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228
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229 lock = (benaphore_t *)malloc( sizeof( benaphore_t ) );
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230 if( lock == NULL ) {
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231 /* TODO: that's bad, raise MemoryError */
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232 return (PyThread_type_lock)NULL;
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233 }
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234
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235 this_lock = atomic_add( &lock_count, 1 );
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236 sprintf( name, "python lock (%d)", this_lock );
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237
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238 retval = benaphore_create( name, lock );
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diff changeset
239 if( retval != EOK ) {
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240 /* TODO: that's bad, raise an exception */
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241 return (PyThread_type_lock)NULL;
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242 }
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diff changeset
243
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244 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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245 return (PyThread_type_lock) lock;
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246 }
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247
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248 void PyThread_free_lock( PyThread_type_lock lock )
9603
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249 {
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250 status_t retval;
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251
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252 dprintf(("PyThread_free_lock(%p) called\n", lock));
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253
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254 retval = benaphore_destroy( (benaphore_t *)lock );
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diff changeset
255 if( retval != EOK ) {
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diff changeset
256 /* TODO: that's bad, raise an exception */
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diff changeset
257 return;
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diff changeset
258 }
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259 }
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260
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diff changeset
261 int PyThread_acquire_lock( PyThread_type_lock lock, int waitflag )
9603
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262 {
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diff changeset
263 int success;
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diff changeset
264 status_t retval;
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265
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266 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
9603
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267
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diff changeset
268 if( waitflag ) {
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269 retval = benaphore_lock( (benaphore_t *)lock );
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diff changeset
270 } else {
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271 retval = benaphore_timedlock( (benaphore_t *)lock, 0 );
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272 }
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diff changeset
273
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diff changeset
274 if( retval == EOK ) {
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diff changeset
275 success = 1;
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diff changeset
276 } else {
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diff changeset
277 success = 0;
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parents:
diff changeset
278
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parents:
diff changeset
279 /* TODO: that's bad, raise an exception */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
280 }
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diff changeset
281
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282 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
9603
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parents:
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283 return success;
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diff changeset
284 }
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diff changeset
285
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diff changeset
286 void PyThread_release_lock( PyThread_type_lock lock )
9603
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parents:
diff changeset
287 {
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288 status_t retval;
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289
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290 dprintf(("PyThread_release_lock(%p) called\n", lock));
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291
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292 retval = benaphore_unlock( (benaphore_t *)lock );
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293 if( retval != EOK ) {
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294 /* TODO: that's bad, raise an exception */
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295 return;
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296 }
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297 }
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298
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299 /* ----------------------------------------------------------------------
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300 * Semaphore support.
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301 *
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302 * Guido says not to implement this because it's not used anywhere;
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303 * I'll do it anyway, you never know when it might be handy, and it's
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304 * easy...
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305 */
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306 PyThread_type_sema PyThread_allocate_sema( int value )
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307 {
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308 sem_id sema;
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309
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310 dprintf(("PyThread_allocate_sema called\n"));
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311
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312 sema = create_sem( value, "python semaphore" );
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313 if( sema < B_NO_ERROR ) {
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314 /* TODO: that's bad, raise an exception */
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315 return 0;
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316 }
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317
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318 dprintf(("PyThread_allocate_sema() -> %p\n", sema));
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319 return (PyThread_type_sema) sema;
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320 }
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321
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322 void PyThread_free_sema( PyThread_type_sema sema )
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323 {
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324 status_t retval;
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325
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326 dprintf(("PyThread_free_sema(%p) called\n", sema));
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327
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328 retval = delete_sem( (sem_id)sema );
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329 if( retval != B_NO_ERROR ) {
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330 /* TODO: that's bad, raise an exception */
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331 return;
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332 }
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333 }
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334
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335 int PyThread_down_sema( PyThread_type_sema sema, int waitflag )
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336 {
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337 status_t retval;
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338
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339 dprintf(("PyThread_down_sema(%p, %d) called\n", sema, waitflag));
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340
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341 if( waitflag ) {
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342 retval = acquire_sem( (sem_id)sema );
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343 } else {
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344 retval = acquire_sem_etc( (sem_id)sema, 1, B_TIMEOUT, 0 );
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345 }
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346
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347 if( retval != B_NO_ERROR ) {
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348 /* TODO: that's bad, raise an exception */
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349 return 0;
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350 }
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351
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352 dprintf(("PyThread_down_sema(%p) return\n", sema));
9603
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353 return -1;
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354 }
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355
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356 void PyThread_up_sema( PyThread_type_sema sema )
9603
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diff changeset
357 {
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358 status_t retval;
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diff changeset
359
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360 dprintf(("PyThread_up_sema(%p)\n", sema));
9603
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parents:
diff changeset
361
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362 retval = release_sem( (sem_id)sema );
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parents:
diff changeset
363 if( retval != B_NO_ERROR ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
364 /* 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
365 return;
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parents:
diff changeset
366 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
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367 }