Mercurial > cpython-lru_cache-weakref

annotate Python/thread_cthread.h @ 4371:c277ee8c669c legacy-trunk

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Sjoerd's thread changes (including down_sema typo fix). Note: waitflag not supported on NT.
author Guido van Rossum <guido@python.org>
date Tue, 08 Oct 1996 14:17:53 +0000
parents 5aab3f668e84
children 65d2d8e67da3
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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 not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 #include <mach/cthreads.h>
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26
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27
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28 /*
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29 * Initialization.
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30 */
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31 static void _init_thread _P0()
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32 {
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33 cthread_init();
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34 }
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35
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36 /*
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37 * Thread support.
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38 */
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39 int start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
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40 {
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41 int success = 0; /* init not needed when SOLARIS_THREADS and */
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42 /* C_THREADS implemented properly */
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43
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44 dprintf(("start_new_thread called\n"));
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45 if (!initialized)
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46 init_thread();
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47 /* looks like solaris detaches the thread to never rejoin
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48 * so well do it here
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49 */
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50 cthread_detach(cthread_fork((cthread_fn_t) func, arg));
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51 return success < 0 ? 0 : 1;
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52 }
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53
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54 long get_thread_ident _P0()
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55 {
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56 if (!initialized)
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57 init_thread();
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58 return (long) cthread_self();
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59 }
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60
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61 static void do_exit_thread _P1(no_cleanup, int no_cleanup)
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62 {
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63 dprintf(("exit_thread called\n"));
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64 if (!initialized)
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65 if (no_cleanup)
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66 _exit(0);
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67 else
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68 exit(0);
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69 cthread_exit(0);
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70 }
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71
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72 void exit_thread _P0()
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73 {
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74 do_exit_thread(0);
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75 }
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76
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77 void _exit_thread _P0()
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78 {
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79 do_exit_thread(1);
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80 }
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81
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82 #ifndef NO_EXIT_PROG
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83 static void do_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
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84 {
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85 dprintf(("exit_prog(%d) called\n", status));
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86 if (!initialized)
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87 if (no_cleanup)
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88 _exit(status);
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89 else
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90 exit(status);
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91 if (no_cleanup)
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92 _exit(status);
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93 else
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94 exit(status);
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95 }
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96
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97 void exit_prog _P1(status, int status)
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98 {
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99 do_exit_prog(status, 0);
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100 }
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101
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102 void _exit_prog _P1(status, int status)
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103 {
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104 do_exit_prog(status, 1);
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105 }
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106 #endif /* NO_EXIT_PROG */
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107
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108 /*
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109 * Lock support.
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110 */
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111 type_lock allocate_lock _P0()
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112 {
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113 mutex_t lock;
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114
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115 dprintf(("allocate_lock called\n"));
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116 if (!initialized)
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117 init_thread();
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118
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119 lock = mutex_alloc();
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120 if (mutex_init(lock)) {
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121 perror("mutex_init");
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122 free((void *) lock);
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123 lock = 0;
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124 }
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125 dprintf(("allocate_lock() -> %lx\n", (long)lock));
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126 return (type_lock) lock;
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127 }
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128
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129 void free_lock _P1(lock, type_lock lock)
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130 {
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131 dprintf(("free_lock(%lx) called\n", (long)lock));
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132 mutex_free(lock);
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133 }
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134
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135 int acquire_lock _P2(lock, type_lock lock, waitflag, int waitflag)
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136 {
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137 int success = FALSE;
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138
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139 dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
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140 if (waitflag) { /* blocking */
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141 mutex_lock(lock);
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142 success = TRUE;
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143 } else { /* non blocking */
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144 success = mutex_try_lock(lock);
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145 }
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146 dprintf(("acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
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147 return success;
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148 }
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149
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150 void release_lock _P1(lock, type_lock lock)
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151 {
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152 dprintf(("release_lock(%lx) called\n", (long)lock));
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153 mutex_unlock((mutex_t )lock);
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154 }
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155
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156 /*
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157 * Semaphore support.
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158 *
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159 * This implementation is ripped directly from the pthreads implementation.
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160 * Which is to say that it is 100% non-functional at this time.
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161 *
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162 * Assuming the page is still up, documentation can be found at:
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163 *
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164 * http://www.doc.ic.ac.uk/~mac/manuals/solaris-manual-pages/solaris/usr/man/man2/_lwp_sema_wait.2.html
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165 *
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166 * Looking at the man page, it seems that one could easily implement a
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167 * semaphore using a condition.
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168 *
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169 */
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170 type_sema allocate_sema _P1(value, int value)
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171 {
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172 char *sema = 0;
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173 dprintf(("allocate_sema called\n"));
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174 if (!initialized)
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175 init_thread();
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176
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177 dprintf(("allocate_sema() -> %lx\n", (long) sema));
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178 return (type_sema) sema;
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179 }
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180
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181 void free_sema _P1(sema, type_sema sema)
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182 {
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183 dprintf(("free_sema(%lx) called\n", (long) sema));
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184 }
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185
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186 int down_sema _P2(sema, type_sema sema, waitflag, int waitflag)
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187 {
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188 dprintf(("down_sema(%lx, %d) called\n", (long) sema, waitflag));
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189 dprintf(("down_sema(%lx) return\n", (long) sema));
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190 return -1;
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191 }
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192
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193 void up_sema _P1(sema, type_sema sema)
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194 {
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195 dprintf(("up_sema(%lx)\n", (long) sema));
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196 }