Mercurial > cpython-lru_cache-weakref

annotate Python/thread_beos.h @ 13973:4e28ca345cfe legacy-trunk

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Fix the parent of WindowsError - both the comments in this source file, and the previous exceptions.py have WindowsError as a sub-class of OSError.
author Mark Hammond <mhammond@skippinet.com.au>
date Tue, 15 Aug 2000 00:37:32 +0000
parents 87ee82e5c56d
children 6f6f965c5e2d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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diff changeset
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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diff changeset
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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diff changeset
240 /* TODO: that's bad, raise an exception */
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241 return (PyThread_type_lock)NULL;
9603
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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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diff changeset
248 void PyThread_free_lock( PyThread_type_lock lock )
9603
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249 {
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diff changeset
250 status_t retval;
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diff changeset
251
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252 dprintf(("PyThread_free_lock(%p) called\n", lock));
9603
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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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parents:
diff changeset
256 /* TODO: that's bad, raise an exception */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
257 return;
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parents:
diff changeset
258 }
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259 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
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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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Guido van Rossum <guido@python.org>
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diff changeset
264 status_t retval;
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diff changeset
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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diff changeset
271 retval = benaphore_timedlock( (benaphore_t *)lock, 0 );
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parents:
diff changeset
272 }
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Guido van Rossum <guido@python.org>
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diff changeset
273
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Guido van Rossum <guido@python.org>
parents:
diff changeset
274 if( retval == EOK ) {
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Guido van Rossum <guido@python.org>
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diff changeset
275 success = 1;
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parents:
diff changeset
276 } else {
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parents:
diff changeset
277 success = 0;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
278
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Guido van Rossum <guido@python.org>
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 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
281
13210
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282 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
283 return success;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
284 }
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parents:
diff changeset
285
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Guido van Rossum <guido@python.org>
parents: 9603
diff changeset
286 void PyThread_release_lock( PyThread_type_lock lock )
9603
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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 ) {
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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 }