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annotate Python/thread_beos.h @ 13255:916fb024ce94 legacy-trunk

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Change copyright notice.
author Guido van Rossum <guido@python.org>
date Fri, 30 Jun 2000 23:50:40 +0000
parents ff243b0f16ee
children 87ee82e5c56d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Copyright (c) 2000, BeOpen.com.
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8 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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9 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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10 All rights reserved.
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11
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12 See the file "Misc/COPYRIGHT" for information on usage and
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13 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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14
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15 BeOS thread support by Chris Herborth (chrish@qnx.com)
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16 ******************************************************************/
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17
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18 #include <kernel/OS.h>
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19 #include <support/SupportDefs.h>
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20 #include <errno.h>
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21
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22 /* ----------------------------------------------------------------------
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23 * Fast locking mechanism described by Benoit Schillings (benoit@be.com)
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24 * in the Be Developer's Newsletter, Issue #26 (http://www.be.com/).
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25 */
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26 typedef struct benaphore {
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27 sem_id _sem;
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28 int32 _atom;
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29 } benaphore_t;
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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 static status_t benaphore_destroy( benaphore_t *ben );
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33 static status_t benaphore_lock( benaphore_t *ben );
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34 static status_t benaphore_timedlock( benaphore_t *ben, bigtime_t micros );
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35 static status_t benaphore_unlock( benaphore_t *ben );
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36
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37 static status_t benaphore_create( const char *name, benaphore_t *ben )
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38 {
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39 if( ben != NULL ) {
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40 ben->_atom = 0;
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41 ben->_sem = create_sem( 0, name );
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42
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43 if( ben->_sem < B_NO_ERROR ) {
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44 return B_BAD_SEM_ID;
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45 }
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46 } else {
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47 return EFAULT;
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48 }
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49
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50 return EOK;
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51 }
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52
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53 static status_t benaphore_destroy( benaphore_t *ben )
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54 {
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55 if( ben->_sem >= B_NO_ERROR ) {
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56 status_t retval = benaphore_timedlock( ben, 0 );
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57
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58 if( retval == EOK || retval == EWOULDBLOCK ) {
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59 status_t del_retval = delete_sem( ben->_sem );
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60
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61 return del_retval;
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62 }
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63 }
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64
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65 return B_BAD_SEM_ID;
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66 }
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67
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68 static status_t benaphore_lock( benaphore_t *ben )
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69 {
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70 int32 prev = atomic_add( &(ben->_atom), 1 );
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71
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72 if( prev > 0 ) {
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73 return acquire_sem( ben->_sem );
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74 }
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75
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76 return EOK;
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77 }
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78
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79 static status_t benaphore_timedlock( benaphore_t *ben, bigtime_t micros )
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80 {
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81 int32 prev = atomic_add( &(ben->_atom), 1 );
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82
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83 if( prev > 0 ) {
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84 status_t retval = acquire_sem_etc( ben->_sem, 1, B_TIMEOUT, micros );
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85
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86 switch( retval ) {
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87 case B_WOULD_BLOCK: /* Fall through... */
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88 case B_TIMED_OUT:
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89 return EWOULDBLOCK;
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90 break;
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91 case B_OK:
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92 return EOK;
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93 break;
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94 default:
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95 return retval;
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96 break;
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97 }
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98 }
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99
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100 return EOK;
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101 }
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102
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103 static status_t benaphore_unlock( benaphore_t *ben )
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104 {
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105 int32 prev = atomic_add( &(ben->_atom), -1 );
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106
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107 if( prev > 1 ) {
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108 return release_sem( ben->_sem );
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109 }
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110
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111 return EOK;
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112 }
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113
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114 /* ----------------------------------------------------------------------
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115 * Initialization.
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116 */
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117 static void PyThread__init_thread( void )
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118 {
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119 /* Do nothing. */
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120 return;
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121 }
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122
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123 /* ----------------------------------------------------------------------
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124 * Thread support.
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125 *
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126 * Only ANSI C, renamed functions here; you can't use K&R on BeOS,
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127 * and there's no legacy thread module to support.
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128 */
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129
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130 static int32 thread_count = 0;
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131
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132 int PyThread_start_new_thread( void (*func)(void *), void *arg )
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133 {
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134 status_t success = 0;
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135 thread_id tid;
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136 char name[B_OS_NAME_LENGTH];
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137 int32 this_thread;
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138
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139 dprintf(("PyThread_start_new_thread called\n"));
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140
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141 /* We are so very thread-safe... */
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142 this_thread = atomic_add( &thread_count, 1 );
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143 sprintf( name, "python thread (%d)", this_thread );
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144
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145 tid = spawn_thread( (thread_func)func, name,
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146 B_NORMAL_PRIORITY, arg );
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147 if( tid > B_NO_ERROR ) {
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148 success = resume_thread( tid );
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149 }
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150
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151 return ( success == B_NO_ERROR ? 1 : 0 );
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152 }
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153
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154 long PyThread_get_thread_ident( void )
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155 {
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156 /* Presumed to return the current thread's ID... */
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157 thread_id tid;
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158 tid = find_thread( NULL );
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159
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160 return ( tid != B_NAME_NOT_FOUND ? tid : -1 );
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161 }
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162
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163 static void do_PyThread_exit_thread( int no_cleanup )
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164 {
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165 int32 threads;
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166
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167 dprintf(("PyThread_exit_thread called\n"));
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168
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169 /* Thread-safe way to read a variable without a mutex: */
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170 threads = atomic_add( &thread_count, 0 );
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171
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172 if( threads == 0 ) {
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173 /* No threads around, so exit main(). */
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174 if( no_cleanup ) {
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175 _exit(0);
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176 } else {
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177 exit(0);
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178 }
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179 } else {
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180 /* Oh, we're a thread, let's try to exit gracefully... */
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181 exit_thread( B_NO_ERROR );
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182 }
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183 }
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184
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185 void PyThread_exit_thread( void )
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186 {
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187 do_PyThread_exit_thread(0);
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188 }
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189
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190 void PyThread__exit_thread( void )
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191 {
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192 do_PyThread_exit_thread(1);
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193 }
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194
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195 #ifndef NO_EXIT_PROG
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196 static void do_PyThread_exit_prog( int status, int no_cleanup )
9603
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197 {
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198 dprintf(("PyThread_exit_prog(%d) called\n", status));
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199
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200 /* No need to do anything, the threads get torn down if main() exits. */
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201
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202 if (no_cleanup) {
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203 _exit(status);
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204 } else {
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205 exit(status);
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206 }
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207 }
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208
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209 void PyThread_exit_prog( int status )
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210 {
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211 do_PyThread_exit_prog(status, 0);
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212 }
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213
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214 void PyThread__exit_prog( int status )
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215 {
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216 do_PyThread_exit_prog(status, 1);
9603
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217 }
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218 #endif /* NO_EXIT_PROG */
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219
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220 /* ----------------------------------------------------------------------
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221 * Lock support.
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222 */
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223
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Guido van Rossum <guido@python.org>
parents:
diff changeset
224 static int32 lock_count = 0;
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225
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diff changeset
226 PyThread_type_lock PyThread_allocate_lock( void )
9603
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227 {
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228 benaphore_t *lock;
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229 status_t retval;
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Guido van Rossum <guido@python.org>
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diff changeset
230 char name[B_OS_NAME_LENGTH];
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Guido van Rossum <guido@python.org>
parents:
diff changeset
231 int32 this_lock;
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232
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233 dprintf(("PyThread_allocate_lock called\n"));
9603
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234
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235 lock = (benaphore_t *)malloc( sizeof( benaphore_t ) );
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Guido van Rossum <guido@python.org>
parents:
diff changeset
236 if( lock == NULL ) {
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parents:
diff changeset
237 /* TODO: that's bad, raise MemoryError */
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diff changeset
238 return (PyThread_type_lock)NULL;
9603
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239 }
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diff changeset
240
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Guido van Rossum <guido@python.org>
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diff changeset
241 this_lock = atomic_add( &lock_count, 1 );
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Guido van Rossum <guido@python.org>
parents:
diff changeset
242 sprintf( name, "python lock (%d)", this_lock );
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Guido van Rossum <guido@python.org>
parents:
diff changeset
243
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Guido van Rossum <guido@python.org>
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diff changeset
244 retval = benaphore_create( name, lock );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
245 if( retval != EOK ) {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
246 /* TODO: that's bad, raise an exception */
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247 return (PyThread_type_lock)NULL;
9603
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248 }
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diff changeset
249
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250 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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diff changeset
251 return (PyThread_type_lock) lock;
9603
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252 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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253
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diff changeset
254 void PyThread_free_lock( PyThread_type_lock lock )
9603
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Guido van Rossum <guido@python.org>
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255 {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
256 status_t retval;
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diff changeset
257
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parents: 9679
diff changeset
258 dprintf(("PyThread_free_lock(%p) called\n", lock));
9603
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259
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diff changeset
260 retval = benaphore_destroy( (benaphore_t *)lock );
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Guido van Rossum <guido@python.org>
parents:
diff changeset
261 if( retval != EOK ) {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
262 /* TODO: that's bad, raise an exception */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
263 return;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
264 }
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Guido van Rossum <guido@python.org>
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diff changeset
265 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
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266
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Guido van Rossum <guido@python.org>
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diff changeset
267 int PyThread_acquire_lock( PyThread_type_lock lock, int waitflag )
9603
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268 {
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diff changeset
269 int success;
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Guido van Rossum <guido@python.org>
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diff changeset
270 status_t retval;
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diff changeset
271
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272 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
9603
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273
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Guido van Rossum <guido@python.org>
parents:
diff changeset
274 if( waitflag ) {
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275 retval = benaphore_lock( (benaphore_t *)lock );
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diff changeset
276 } else {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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diff changeset
277 retval = benaphore_timedlock( (benaphore_t *)lock, 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>
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diff changeset
279
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
280 if( retval == EOK ) {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
281 success = 1;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
282 } else {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
283 success = 0;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
284
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Guido van Rossum <guido@python.org>
parents:
diff changeset
285 /* TODO: that's bad, raise an exception */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
286 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
287
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
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diff changeset
288 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
9603
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289 return success;
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290 }
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291
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292 void PyThread_release_lock( PyThread_type_lock lock )
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293 {
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294 status_t retval;
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295
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296 dprintf(("PyThread_release_lock(%p) called\n", lock));
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297
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298 retval = benaphore_unlock( (benaphore_t *)lock );
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299 if( retval != EOK ) {
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300 /* TODO: that's bad, raise an exception */
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301 return;
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302 }
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303 }
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304
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305 /* ----------------------------------------------------------------------
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306 * Semaphore support.
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307 *
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308 * Guido says not to implement this because it's not used anywhere;
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309 * I'll do it anyway, you never know when it might be handy, and it's
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310 * easy...
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311 */
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312 PyThread_type_sema PyThread_allocate_sema( int value )
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313 {
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314 sem_id sema;
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315
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316 dprintf(("PyThread_allocate_sema called\n"));
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317
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318 sema = create_sem( value, "python semaphore" );
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319 if( sema < B_NO_ERROR ) {
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320 /* TODO: that's bad, raise an exception */
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321 return 0;
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322 }
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323
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324 dprintf(("PyThread_allocate_sema() -> %p\n", sema));
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325 return (PyThread_type_sema) sema;
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326 }
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327
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328 void PyThread_free_sema( PyThread_type_sema sema )
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329 {
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330 status_t retval;
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331
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332 dprintf(("PyThread_free_sema(%p) called\n", sema));
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333
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334 retval = delete_sem( (sem_id)sema );
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335 if( retval != B_NO_ERROR ) {
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336 /* TODO: that's bad, raise an exception */
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337 return;
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338 }
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339 }
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340
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341 int PyThread_down_sema( PyThread_type_sema sema, int waitflag )
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342 {
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343 status_t retval;
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344
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345 dprintf(("PyThread_down_sema(%p, %d) called\n", sema, waitflag));
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346
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347 if( waitflag ) {
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348 retval = acquire_sem( (sem_id)sema );
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349 } else {
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350 retval = acquire_sem_etc( (sem_id)sema, 1, B_TIMEOUT, 0 );
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351 }
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352
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353 if( retval != B_NO_ERROR ) {
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354 /* TODO: that's bad, raise an exception */
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355 return 0;
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356 }
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357
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358 dprintf(("PyThread_down_sema(%p) return\n", sema));
9603
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359 return -1;
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360 }
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361
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362 void PyThread_up_sema( PyThread_type_sema sema )
9603
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parents:
diff changeset
363 {
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diff changeset
364 status_t retval;
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diff changeset
365
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366 dprintf(("PyThread_up_sema(%p)\n", sema));
9603
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parents:
diff changeset
367
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368 retval = release_sem( (sem_id)sema );
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parents:
diff changeset
369 if( retval != B_NO_ERROR ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
370 /* TODO: that's bad, raise an exception */
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parents:
diff changeset
371 return;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
372 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
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373 }