Mercurial > cpython-lru_cache-weakref

annotate Python/thread_cthread.h @ 6139:a287c5014e66 legacy-trunk

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Reverse the search order for the Don Beaudry hook so that the first class wins. Makes more sense.
author Guido van Rossum <guido@python.org>
date Fri, 22 Aug 1997 16:56:16 +0000
parents 65d2d8e67da3
children 877d23bd5bdc
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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 ******************************************************************/
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31
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32 #include <mach/cthreads.h>
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33
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34
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35 /*
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36 * Initialization.
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37 */
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38 static void _init_thread _P0()
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39 {
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40 cthread_init();
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41 }
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42
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43 /*
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44 * Thread support.
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45 */
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46 int start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
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47 {
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48 int success = 0; /* init not needed when SOLARIS_THREADS and */
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49 /* C_THREADS implemented properly */
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50
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51 dprintf(("start_new_thread called\n"));
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52 if (!initialized)
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53 init_thread();
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54 /* looks like solaris detaches the thread to never rejoin
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55 * so well do it here
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56 */
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57 cthread_detach(cthread_fork((cthread_fn_t) func, arg));
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58 return success < 0 ? 0 : 1;
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59 }
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60
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61 long get_thread_ident _P0()
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62 {
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63 if (!initialized)
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64 init_thread();
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65 return (long) cthread_self();
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66 }
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67
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68 static void do_exit_thread _P1(no_cleanup, int no_cleanup)
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69 {
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70 dprintf(("exit_thread called\n"));
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71 if (!initialized)
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72 if (no_cleanup)
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73 _exit(0);
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74 else
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75 exit(0);
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76 cthread_exit(0);
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77 }
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78
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79 void exit_thread _P0()
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80 {
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81 do_exit_thread(0);
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82 }
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83
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84 void _exit_thread _P0()
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85 {
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86 do_exit_thread(1);
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87 }
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88
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89 #ifndef NO_EXIT_PROG
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90 static void do_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
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91 {
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92 dprintf(("exit_prog(%d) called\n", status));
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93 if (!initialized)
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94 if (no_cleanup)
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95 _exit(status);
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96 else
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97 exit(status);
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98 if (no_cleanup)
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99 _exit(status);
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100 else
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101 exit(status);
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102 }
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103
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104 void exit_prog _P1(status, int status)
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105 {
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106 do_exit_prog(status, 0);
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107 }
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108
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109 void _exit_prog _P1(status, int status)
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110 {
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111 do_exit_prog(status, 1);
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112 }
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113 #endif /* NO_EXIT_PROG */
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114
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115 /*
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116 * Lock support.
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117 */
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118 type_lock allocate_lock _P0()
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119 {
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120 mutex_t lock;
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121
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122 dprintf(("allocate_lock called\n"));
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123 if (!initialized)
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124 init_thread();
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125
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126 lock = mutex_alloc();
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127 if (mutex_init(lock)) {
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128 perror("mutex_init");
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129 free((void *) lock);
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130 lock = 0;
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131 }
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132 dprintf(("allocate_lock() -> %lx\n", (long)lock));
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133 return (type_lock) lock;
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134 }
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135
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136 void free_lock _P1(lock, type_lock lock)
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137 {
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138 dprintf(("free_lock(%lx) called\n", (long)lock));
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139 mutex_free(lock);
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140 }
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141
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142 int acquire_lock _P2(lock, type_lock lock, waitflag, int waitflag)
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143 {
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144 int success = FALSE;
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145
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146 dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
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147 if (waitflag) { /* blocking */
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148 mutex_lock(lock);
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149 success = TRUE;
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150 } else { /* non blocking */
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151 success = mutex_try_lock(lock);
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152 }
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153 dprintf(("acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
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154 return success;
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155 }
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156
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157 void release_lock _P1(lock, type_lock lock)
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158 {
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159 dprintf(("release_lock(%lx) called\n", (long)lock));
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160 mutex_unlock((mutex_t )lock);
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161 }
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162
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163 /*
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164 * Semaphore support.
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165 *
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166 * This implementation is ripped directly from the pthreads implementation.
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167 * Which is to say that it is 100% non-functional at this time.
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168 *
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169 * Assuming the page is still up, documentation can be found at:
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170 *
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171 * http://www.doc.ic.ac.uk/~mac/manuals/solaris-manual-pages/solaris/usr/man/man2/_lwp_sema_wait.2.html
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172 *
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173 * Looking at the man page, it seems that one could easily implement a
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174 * semaphore using a condition.
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175 *
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176 */
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177 type_sema allocate_sema _P1(value, int value)
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178 {
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179 char *sema = 0;
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180 dprintf(("allocate_sema called\n"));
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181 if (!initialized)
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182 init_thread();
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183
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184 dprintf(("allocate_sema() -> %lx\n", (long) sema));
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185 return (type_sema) sema;
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186 }
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187
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188 void free_sema _P1(sema, type_sema sema)
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189 {
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190 dprintf(("free_sema(%lx) called\n", (long) sema));
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191 }
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192
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193 int down_sema _P2(sema, type_sema sema, waitflag, int waitflag)
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194 {
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195 dprintf(("down_sema(%lx, %d) called\n", (long) sema, waitflag));
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196 dprintf(("down_sema(%lx) return\n", (long) sema));
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197 return -1;
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198 }
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199
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200 void up_sema _P1(sema, type_sema sema)
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201 {
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202 dprintf(("up_sema(%lx)\n", (long) sema));
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203 }