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Trent Mick <trentm@activestate.com>: The common technique for printing out a pointer has been to cast to a long and use the "%lx" printf modifier. This is incorrect on Win64 where casting to a long truncates the pointer. The "%p" formatter should be used instead. The problem as stated by Tim: > Unfortunately, the C committee refused to define what %p conversion "looks > like" -- they explicitly allowed it to be implementation-defined. Older > versions of Microsoft C even stuck a colon in the middle of the address (in > the days of segment+offset addressing)! The result is that the hex value of a pointer will maybe/maybe not have a 0x prepended to it. Notes on the patch: There are two main classes of changes: - in the various repr() functions that print out pointers - debugging printf's in the various thread_*.h files (these are why the patch is large) Closes SourceForge patch #100505.
author Fred Drake <fdrake@acm.org>
date Fri, 30 Jun 2000 15:01:00 +0000
parents b320cf3a98b9
children 916fb024ce94
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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 /* GNU pth threads interface
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33 http://www.gnu.org/software/pth
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34 2000-05-03 Andy Dustman <andy@dustman.net>
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35
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36 Adapted from Posix threads interface
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37 12 May 1997 -- david arnold <davida@pobox.com>
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38 */
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39
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40 #include <stdlib.h>
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41 #include <string.h>
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42 #include <pth.h>
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43
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44 /* A pth mutex isn't sufficient to model the Python lock type
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45 * because pth mutexes can be acquired multiple times by the
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46 * same thread.
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47 *
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48 * The pth_lock struct implements a Python lock as a "locked?" bit
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49 * and a <condition, mutex> pair. In general, if the bit can be acquired
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50 * instantly, it is, else the pair is used to block the thread until the
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51 * bit is cleared.
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52 */
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53
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54 typedef struct {
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55 char locked; /* 0=unlocked, 1=locked */
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56 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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57 pth_cond_t lock_released;
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58 pth_mutex_t mut;
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59 } pth_lock;
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60
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61 #define CHECK_STATUS(name) if (status == -1) { printf("%d ", status); perror(name); error = 1; }
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62
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63 /*
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64 * Initialization.
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65 */
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66
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67 static void PyThread__init_thread _P0()
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68 {
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69 pth_init();
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70 }
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71
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72 /*
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73 * Thread support.
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74 */
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75
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76
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77 int PyThread_start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
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78 {
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79 pth_t th;
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80 int success;
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81 dprintf(("PyThread_start_new_thread called\n"));
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82 if (!initialized)
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83 PyThread_init_thread();
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84
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85 th = pth_spawn(PTH_ATTR_DEFAULT,
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86 (void* (*)_P((void *)))func,
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87 (void *)arg
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88 );
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89
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90 return th == NULL ? 0 : 1;
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91 }
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92
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93 long PyThread_get_thread_ident _P0()
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94 {
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95 volatile pth_t threadid;
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96 if (!initialized)
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97 PyThread_init_thread();
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98 /* Jump through some hoops for Alpha OSF/1 */
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99 threadid = pth_self();
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100 return (long) *(long *) &threadid;
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101 }
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102
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103 static void do_PyThread_exit_thread _P1(no_cleanup, int no_cleanup)
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104 {
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105 dprintf(("PyThread_exit_thread called\n"));
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106 if (!initialized) {
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107 if (no_cleanup)
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108 _exit(0);
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109 else
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110 exit(0);
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111 }
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112 }
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113
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114 void PyThread_exit_thread _P0()
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115 {
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116 do_PyThread_exit_thread(0);
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117 }
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118
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119 void PyThread__exit_thread _P0()
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120 {
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121 do_PyThread_exit_thread(1);
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122 }
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123
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124 #ifndef NO_EXIT_PROG
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125 static void do_PyThread_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
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126 {
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127 dprintf(("PyThread_exit_prog(%d) called\n", status));
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128 if (!initialized)
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129 if (no_cleanup)
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130 _exit(status);
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131 else
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132 exit(status);
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133 }
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134
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135 void PyThread_exit_prog _P1(status, int status)
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136 {
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137 do_PyThread_exit_prog(status, 0);
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138 }
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139
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140 void PyThread__exit_prog _P1(status, int status)
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141 {
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142 do_PyThread_exit_prog(status, 1);
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143 }
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144 #endif /* NO_EXIT_PROG */
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145
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146 /*
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147 * Lock support.
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148 */
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149 PyThread_type_lock PyThread_allocate_lock _P0()
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150 {
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151 pth_lock *lock;
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152 int status, error = 0;
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153
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154 dprintf(("PyThread_allocate_lock called\n"));
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155 if (!initialized)
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156 PyThread_init_thread();
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157
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158 lock = (pth_lock *) malloc(sizeof(pth_lock));
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159 memset((void *)lock, '\0', sizeof(pth_lock));
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160 if (lock) {
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161 lock->locked = 0;
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162 status = pth_mutex_init(&lock->mut);
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163 CHECK_STATUS("pth_mutex_init");
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164 status = pth_cond_init(&lock->lock_released);
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165 CHECK_STATUS("pth_cond_init");
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166 if (error) {
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167 free((void *)lock);
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168 lock = NULL;
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169 }
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170 }
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171 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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172 return (PyThread_type_lock) lock;
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173 }
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174
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175 void PyThread_free_lock _P1(lock, PyThread_type_lock lock)
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176 {
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177 pth_lock *thelock = (pth_lock *)lock;
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178 int status, error = 0;
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179
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180 dprintf(("PyThread_free_lock(%p) called\n", lock));
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181
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182 free((void *)thelock);
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183 }
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184
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185 int PyThread_acquire_lock _P2(lock, PyThread_type_lock lock, waitflag, int waitflag)
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186 {
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187 int success;
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188 pth_lock *thelock = (pth_lock *)lock;
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189 int status, error = 0;
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190
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191 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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192
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193 status = pth_mutex_acquire(&thelock->mut, !waitflag, NULL);
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194 CHECK_STATUS("pth_mutex_acquire[1]");
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195 success = thelock->locked == 0;
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196 if (success) thelock->locked = 1;
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197 status = pth_mutex_release( &thelock->mut );
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198 CHECK_STATUS("pth_mutex_release[1]");
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199
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200 if ( !success && waitflag ) {
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201 /* continue trying until we get the lock */
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202
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203 /* mut must be locked by me -- part of the condition
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204 * protocol */
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205 status = pth_mutex_acquire( &thelock->mut, !waitflag, NULL );
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206 CHECK_STATUS("pth_mutex_acquire[2]");
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207 while ( thelock->locked ) {
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208 status = pth_cond_await(&thelock->lock_released,
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209 &thelock->mut, NULL);
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210 CHECK_STATUS("pth_cond_await");
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211 }
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212 thelock->locked = 1;
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213 status = pth_mutex_release( &thelock->mut );
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214 CHECK_STATUS("pth_mutex_release[2]");
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215 success = 1;
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216 }
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217 if (error) success = 0;
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218 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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219 return success;
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220 }
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221
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222 void PyThread_release_lock _P1(lock, PyThread_type_lock lock)
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223 {
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224 pth_lock *thelock = (pth_lock *)lock;
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225 int status, error = 0;
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226
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227 dprintf(("PyThread_release_lock(%p) called\n", lock));
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228
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229 status = pth_mutex_acquire( &thelock->mut, 0, NULL );
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230 CHECK_STATUS("pth_mutex_acquire[3]");
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231
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232 thelock->locked = 0;
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233
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234 status = pth_mutex_release( &thelock->mut );
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235 CHECK_STATUS("pth_mutex_release[3]");
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236
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237 /* wake up someone (anyone, if any) waiting on the lock */
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238 status = pth_cond_notify( &thelock->lock_released, 0 );
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239 CHECK_STATUS("pth_cond_notify");
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240 }
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241
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242 /*
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243 * Semaphore support.
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244 */
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245
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246 struct semaphore {
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247 pth_mutex_t mutex;
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248 pth_cond_t cond;
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249 int value;
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250 };
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251
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252 PyThread_type_sema PyThread_allocate_sema _P1(value, int value)
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253 {
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254 struct semaphore *sema;
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255 int status, error = 0;
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256
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257 dprintf(("PyThread_allocate_sema called\n"));
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258 if (!initialized)
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259 PyThread_init_thread();
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260
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261 sema = (struct semaphore *) malloc(sizeof(struct semaphore));
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262 if (sema != NULL) {
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263 sema->value = value;
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264 status = pth_mutex_init(&sema->mutex);
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265 CHECK_STATUS("pth_mutex_init");
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266 status = pth_cond_init(&sema->cond);
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267 CHECK_STATUS("pth_mutex_init");
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268 if (error) {
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269 free((void *) sema);
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270 sema = NULL;
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271 }
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272 }
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273 dprintf(("PyThread_allocate_sema() -> %p\n", sema));
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274 return (PyThread_type_sema) sema;
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275 }
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276
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277 void PyThread_free_sema _P1(sema, PyThread_type_sema sema)
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278 {
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279 int status, error = 0;
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280 struct semaphore *thesema = (struct semaphore *) sema;
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281
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282 dprintf(("PyThread_free_sema(%p) called\n", sema));
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283 free((void *) thesema);
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284 }
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285
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286 int PyThread_down_sema _P2(sema, PyThread_type_sema sema, waitflag, int waitflag)
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287 {
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288 int status, error = 0, success;
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289 struct semaphore *thesema = (struct semaphore *) sema;
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290
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291 dprintf(("PyThread_down_sema(%p, %d) called\n", sema, waitflag));
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292 status = pth_mutex_acquire(&thesema->mutex, !waitflag, NULL);
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293 CHECK_STATUS("pth_mutex_acquire");
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294 if (waitflag) {
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295 while (!error && thesema->value <= 0) {
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296 status = pth_cond_await(&thesema->cond,
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297 &thesema->mutex, NULL);
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298 CHECK_STATUS("pth_cond_await");
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299 }
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300 }
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301 if (error)
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302 success = 0;
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303 else if (thesema->value > 0) {
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304 thesema->value--;
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305 success = 1;
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306 }
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307 else
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308 success = 0;
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309 status = pth_mutex_release(&thesema->mutex);
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310 CHECK_STATUS("pth_mutex_release");
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311 dprintf(("PyThread_down_sema(%p) return\n", sema));
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312 return success;
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313 }
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314
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315 void PyThread_up_sema _P1(sema, PyThread_type_sema sema)
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316 {
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317 int status, error = 0;
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318 struct semaphore *thesema = (struct semaphore *) sema;
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319
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320 dprintf(("PyThread_up_sema(%p)\n", sema));
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321 status = pth_mutex_acquire(&thesema->mutex, 0, NULL);
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322 CHECK_STATUS("pth_mutex_acquire");
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323 thesema->value++;
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324 status = pth_cond_notify(&thesema->cond, 1);
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325 CHECK_STATUS("pth_cond_notify");
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326 status = pth_mutex_release(&thesema->mutex);
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327 CHECK_STATUS("pth_mutex_release");
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328 }