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Adding thread support for BeOS by Chris Herborth.
author Guido van Rossum <guido@python.org>
date Mon, 07 Dec 1998 21:56:59 +0000
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children 877d23bd5bdc
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9603
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
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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 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 BeOS thread support by Chris Herborth (chrish@qnx.com)
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31 ******************************************************************/
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32
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33 #include <kernel/OS.h>
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34 #include <support/SupportDefs.h>
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35 #include <errno.h>
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36
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37 /* ----------------------------------------------------------------------
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38 * Fast locking mechanism described by Benoit Schillings (benoit@be.com)
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39 * in the Be Developer's Newsletter, Issue #26 (http://www.be.com/).
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40 */
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41 typedef struct benaphore {
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42 sem_id _sem;
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43 int32 _atom;
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44 } benaphore_t;
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45
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46 static status_t benaphore_create( const char *name, benaphore_t *ben );
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47 static status_t benaphore_destroy( benaphore_t *ben );
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48 static status_t benaphore_lock( benaphore_t *ben );
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49 static status_t benaphore_timedlock( benaphore_t *ben, bigtime_t micros );
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50 static status_t benaphore_unlock( benaphore_t *ben );
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51
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52 static status_t benaphore_create( const char *name, benaphore_t *ben )
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53 {
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54 if( ben != NULL ) {
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55 ben->_atom = 0;
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56 ben->_sem = create_sem( 0, name );
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57
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58 if( ben->_sem < B_NO_ERROR ) {
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59 return B_BAD_SEM_ID;
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60 }
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61 } else {
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62 return EFAULT;
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63 }
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64
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65 return EOK;
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66 }
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67
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68 static status_t benaphore_destroy( benaphore_t *ben )
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69 {
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70 if( ben->_sem >= B_NO_ERROR ) {
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71 status_t retval = benaphore_timedlock( ben, 0 );
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72
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73 if( retval == EOK || retval == EWOULDBLOCK ) {
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74 status_t del_retval = delete_sem( ben->_sem );
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75
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76 return del_retval;
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77 }
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78 }
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79
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80 return B_BAD_SEM_ID;
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81 }
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82
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83 static status_t benaphore_lock( benaphore_t *ben )
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84 {
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85 int32 prev = atomic_add( &(ben->_atom), 1 );
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86
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87 if( prev > 0 ) {
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88 return acquire_sem( ben->_sem );
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89 }
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90
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91 return EOK;
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92 }
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93
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94 static status_t benaphore_timedlock( benaphore_t *ben, bigtime_t micros )
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95 {
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96 int32 prev = atomic_add( &(ben->_atom), 1 );
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97
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98 if( prev > 0 ) {
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99 status_t retval = acquire_sem_etc( ben->_sem, 1, B_TIMEOUT, micros );
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100
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101 switch( retval ) {
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102 case B_WOULD_BLOCK: /* Fall through... */
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103 case B_TIMED_OUT:
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104 return EWOULDBLOCK;
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105 break;
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106 case B_OK:
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107 return EOK;
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108 break;
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109 default:
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110 return retval;
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111 break;
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112 }
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113 }
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114
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115 return EOK;
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116 }
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117
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118 static status_t benaphore_unlock( benaphore_t *ben )
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119 {
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120 int32 prev = atomic_add( &(ben->_atom), -1 );
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121
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122 if( prev > 1 ) {
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123 return release_sem( ben->_sem );
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124 }
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125
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126 return EOK;
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127 }
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128
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129 /* ----------------------------------------------------------------------
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130 * Initialization.
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131 */
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132 static void _init_thread( void )
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133 {
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134 /* Do nothing. */
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135 return;
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136 }
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137
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138 /* ----------------------------------------------------------------------
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139 * Thread support.
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140 *
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141 * Only ANSI C, renamed functions here; you can't use K&R on BeOS,
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142 * and there's no legacy thread module to support.
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143 */
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144
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145 static int32 thread_count = 0;
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146
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147 int PyThread_start_new_thread( void (*func)(void *), void *arg )
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148 {
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149 status_t success = 0;
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150 thread_id tid;
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151 char name[B_OS_NAME_LENGTH];
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152 int32 this_thread;
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153
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154 dprintf(("start_new_thread called\n"));
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155
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156 /* We are so very thread-safe... */
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157 this_thread = atomic_add( &thread_count, 1 );
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158 sprintf( name, "python thread (%d)", this_thread );
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159
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160 tid = spawn_thread( (thread_func)func, name,
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161 B_NORMAL_PRIORITY, arg );
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162 if( tid > B_NO_ERROR ) {
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163 success = resume_thread( tid );
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164 }
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165
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166 return ( success == B_NO_ERROR ? 1 : 0 );
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167 }
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168
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169 long PyThread_get_thread_ident( void )
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170 {
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171 /* Presumed to return the current thread's ID... */
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172 thread_id tid;
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173 tid = find_thread( NULL );
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174
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175 return ( tid != B_NAME_NOT_FOUND ? tid : -1 );
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176 }
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177
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178 static void do_exit_thread( int no_cleanup )
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179 {
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180 int32 threads;
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181
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182 dprintf(("exit_thread called\n"));
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183
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184 /* Thread-safe way to read a variable without a mutex: */
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185 threads = atomic_add( &thread_count, 0 );
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186
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187 if( threads == 0 ) {
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188 /* No threads around, so exit main(). */
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189 if( no_cleanup ) {
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190 _exit(0);
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191 } else {
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192 exit(0);
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193 }
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194 } else {
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195 /* Oh, we're a thread, let's try to exit gracefully... */
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196 exit_thread( B_NO_ERROR );
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197 }
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198 }
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199
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200 void PyThread_exit_thread( void )
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201 {
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202 do_exit_thread(0);
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203 }
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204
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205 void PyThread__exit_thread( void )
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206 {
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207 do_exit_thread(1);
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208 }
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209
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210 #ifndef NO_EXIT_PROG
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211 static void do_exit_prog( int status, int no_cleanup )
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212 {
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213 dprintf(("exit_prog(%d) called\n", status));
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214
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215 /* No need to do anything, the threads get torn down if main() exits. */
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216
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217 if (no_cleanup) {
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218 _exit(status);
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219 } else {
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220 exit(status);
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221 }
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222 }
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223
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224 void PyThread_exit_prog( int status )
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225 {
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226 do_exit_prog(status, 0);
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227 }
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228
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229 void PyThread__exit_prog( int status )
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230 {
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231 do_exit_prog(status, 1);
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232 }
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233 #endif /* NO_EXIT_PROG */
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234
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235 /* ----------------------------------------------------------------------
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236 * Lock support.
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237 */
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238
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239 static int32 lock_count = 0;
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240
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241 type_lock PyThread_allocate_lock( void )
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242 {
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243 benaphore_t *lock;
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244 status_t retval;
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245 char name[B_OS_NAME_LENGTH];
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246 int32 this_lock;
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247
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248 dprintf(("allocate_lock called\n"));
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249
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250 lock = (benaphore_t *)malloc( sizeof( benaphore_t ) );
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251 if( lock == NULL ) {
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252 /* TODO: that's bad, raise MemoryError */
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253 return (type_lock)NULL;
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254 }
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255
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256 this_lock = atomic_add( &lock_count, 1 );
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257 sprintf( name, "python lock (%d)", this_lock );
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258
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259 retval = benaphore_create( name, lock );
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diff changeset
260 if( retval != EOK ) {
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diff changeset
261 /* TODO: that's bad, raise an exception */
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262 return (type_lock)NULL;
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diff changeset
263 }
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264
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265 dprintf(("allocate_lock() -> %lx\n", (long)lock));
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266 return (type_lock) lock;
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diff changeset
267 }
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268
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269 void PyThread_free_lock( type_lock lock )
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270 {
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diff changeset
271 status_t retval;
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272
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273 dprintf(("free_lock(%lx) called\n", (long)lock));
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274
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275 retval = benaphore_destroy( (benaphore_t *)lock );
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diff changeset
276 if( retval != EOK ) {
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diff changeset
277 /* TODO: that's bad, raise an exception */
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278 return;
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diff changeset
279 }
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280 }
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281
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282 int PyThread_acquire_lock( type_lock lock, int waitflag )
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diff changeset
283 {
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diff changeset
284 int success;
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diff changeset
285 status_t retval;
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diff changeset
286
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287 dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
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288
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diff changeset
289 if( waitflag ) {
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290 retval = benaphore_lock( (benaphore_t *)lock );
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diff changeset
291 } else {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
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292 retval = benaphore_timedlock( (benaphore_t *)lock, 0 );
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Guido van Rossum <guido@python.org>
parents:
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293 }
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Guido van Rossum <guido@python.org>
parents:
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294
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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diff changeset
295 if( retval == EOK ) {
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Guido van Rossum <guido@python.org>
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diff changeset
296 success = 1;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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diff changeset
297 } else {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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298 success = 0;
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Guido van Rossum <guido@python.org>
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299
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
300 /* 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
301 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
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302
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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303 dprintf(("acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
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Guido van Rossum <guido@python.org>
parents:
diff changeset
304 return success;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
305 }
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Guido van Rossum <guido@python.org>
parents:
diff changeset
306
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Guido van Rossum <guido@python.org>
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307 void PyThread_release_lock( type_lock lock )
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Guido van Rossum <guido@python.org>
parents:
diff changeset
308 {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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diff changeset
309 status_t retval;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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310
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311 dprintf(("release_lock(%lx) called\n", (long)lock));
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Guido van Rossum <guido@python.org>
parents:
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312
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
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313 retval = benaphore_unlock( (benaphore_t *)lock );
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Guido van Rossum <guido@python.org>
parents:
diff changeset
314 if( retval != EOK ) {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
315 /* TODO: that's bad, raise an exception */
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Guido van Rossum <guido@python.org>
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316 return;
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Guido van Rossum <guido@python.org>
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317 }
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Guido van Rossum <guido@python.org>
parents:
diff changeset
318 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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319
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Guido van Rossum <guido@python.org>
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320 /* ----------------------------------------------------------------------
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Guido van Rossum <guido@python.org>
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321 * Semaphore support.
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Guido van Rossum <guido@python.org>
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322 *
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Guido van Rossum <guido@python.org>
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323 * Guido says not to implement this because it's not used anywhere;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
324 * I'll do it anyway, you never know when it might be handy, and it's
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
325 * easy...
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
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326 */
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327 type_sema PyThread_allocate_sema( int value )
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Guido van Rossum <guido@python.org>
parents:
diff changeset
328 {
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Guido van Rossum <guido@python.org>
parents:
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329 sem_id sema;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
330
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Guido van Rossum <guido@python.org>
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331 dprintf(("allocate_sema called\n"));
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Guido van Rossum <guido@python.org>
parents:
diff changeset
332
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
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diff changeset
333 sema = create_sem( value, "python semaphore" );
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Guido van Rossum <guido@python.org>
parents:
diff changeset
334 if( sema < B_NO_ERROR ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
335 /* 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
336 return 0;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
337 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
338
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
339 dprintf(("allocate_sema() -> %lx\n", (long) sema));
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Guido van Rossum <guido@python.org>
parents:
diff changeset
340 return (type_sema) sema;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
341 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
342
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
343 void PyThread_free_sema( type_sema sema )
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
344 {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
345 status_t retval;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
346
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
347 dprintf(("free_sema(%lx) called\n", (long) sema));
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
348
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
349 retval = delete_sem( (sem_id)sema );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
350 if( retval != B_NO_ERROR ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
351 /* 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
352 return;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
353 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
354 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
355
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
356 int PyThread_down_sema( type_sema sema, int waitflag )
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
357 {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
358 status_t retval;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
359
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
360 dprintf(("down_sema(%lx, %d) called\n", (long) sema, waitflag));
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
361
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
362 if( waitflag ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
363 retval = acquire_sem( (sem_id)sema );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
364 } else {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
365 retval = acquire_sem_etc( (sem_id)sema, 1, B_TIMEOUT, 0 );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
366 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
367
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
368 if( retval != B_NO_ERROR ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
369 /* 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
370 return 0;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
371 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
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:
diff changeset
373 dprintf(("down_sema(%lx) return\n", (long) sema));
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Guido van Rossum <guido@python.org>
parents:
diff changeset
374 return -1;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
375 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
376
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
377 void PyThread_up_sema( type_sema sema )
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
378 {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
379 status_t retval;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
380
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
381 dprintf(("up_sema(%lx)\n", (long) sema));
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
382
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
383 retval = release_sem( (sem_id)sema );
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
384 if( retval != B_NO_ERROR ) {
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
385 /* 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
386 return;
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
387 }
c4e2da477949 Adding thread support for BeOS by Chris Herborth.
Guido van Rossum <guido@python.org>
parents:
diff changeset
388 }