Mercurial > cpython-lru_cache-weakref

annotate Python/thread_os2.h @ 68239:ceec209b26d4 2.4

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Close 2.4 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:56:41 +0100
parents 78643be3cf40
children
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1 /* This code implemented by cvale@netcom.com */
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2
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3 #define INCL_DOSPROCESS
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4 #define INCL_DOSSEMAPHORES
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5 #include "os2.h"
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6 #include "limits.h"
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7
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8 #include "process.h"
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9
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10 #if defined(PYCC_GCC)
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11 #include <sys/builtin.h>
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12 #include <sys/fmutex.h>
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13 #else
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14 long PyThread_get_thread_ident(void);
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15 #endif
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16
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17 #if !defined(THREAD_STACK_SIZE)
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18 #define THREAD_STACK_SIZE 0x10000
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19 #endif
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20
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21 /*
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22 * Initialization of the C package, should not be needed.
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23 */
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24 static void
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25 PyThread__init_thread(void)
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26 {
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27 }
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28
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29 /*
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30 * Thread support.
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31 */
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32 long
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33 PyThread_start_new_thread(void (*func)(void *), void *arg)
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34 {
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35 int thread_id;
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36
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37 thread_id = _beginthread(func, NULL, THREAD_STACK_SIZE, arg);
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38
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39 if (thread_id == -1) {
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40 dprintf(("_beginthread failed. return %ld\n", errno));
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41 }
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42
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43 return thread_id;
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44 }
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45
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46 long
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47 PyThread_get_thread_ident(void)
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48 {
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49 #if !defined(PYCC_GCC)
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50 PPIB pib;
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51 PTIB tib;
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52 #endif
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53
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54 if (!initialized)
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55 PyThread_init_thread();
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56
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57 #if defined(PYCC_GCC)
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58 return _gettid();
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59 #else
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60 DosGetInfoBlocks(&tib, &pib);
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61 return tib->tib_ptib2->tib2_ultid;
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62 #endif
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63 }
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64
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65 static void
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66 do_PyThread_exit_thread(int no_cleanup)
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67 {
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68 dprintf(("%ld: PyThread_exit_thread called\n",
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69 PyThread_get_thread_ident()));
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70 if (!initialized)
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71 if (no_cleanup)
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72 _exit(0);
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73 else
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74 exit(0);
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75 _endthread();
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76 }
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77
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78 void
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79 PyThread_exit_thread(void)
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80 {
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81 do_PyThread_exit_thread(0);
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82 }
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83
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84 void
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85 PyThread__exit_thread(void)
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86 {
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87 do_PyThread_exit_thread(1);
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88 }
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89
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90 #ifndef NO_EXIT_PROG
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91 static void
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92 do_PyThread_exit_prog(int status, int no_cleanup)
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93 {
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94 dprintf(("PyThread_exit_prog(%d) called\n", status));
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95 if (!initialized)
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96 if (no_cleanup)
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97 _exit(status);
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98 else
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99 exit(status);
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100 }
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101
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102 void
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103 PyThread_exit_prog(int status)
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104 {
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105 do_PyThread_exit_prog(status, 0);
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106 }
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107
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108 void
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109 PyThread__exit_prog(int status)
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110 {
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111 do_PyThread_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. This is implemented with an event semaphore and critical
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117 * sections to make it behave more like a posix mutex than its OS/2
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118 * counterparts.
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119 */
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120
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121 typedef struct os2_lock_t {
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122 int is_set;
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123 HEV changed;
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124 } *type_os2_lock;
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125
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126 PyThread_type_lock
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127 PyThread_allocate_lock(void)
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128 {
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129 #if defined(PYCC_GCC)
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130 _fmutex *sem = malloc(sizeof(_fmutex));
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131 if (!initialized)
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132 PyThread_init_thread();
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133 dprintf(("%ld: PyThread_allocate_lock() -> %lx\n",
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134 PyThread_get_thread_ident(),
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135 (long)sem));
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136 if (_fmutex_create(sem, 0)) {
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137 free(sem);
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138 sem = NULL;
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139 }
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140 return (PyThread_type_lock)sem;
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141 #else
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142 APIRET rc;
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143 type_os2_lock lock = (type_os2_lock)malloc(sizeof(struct os2_lock_t));
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144
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145 dprintf(("PyThread_allocate_lock called\n"));
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146 if (!initialized)
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147 PyThread_init_thread();
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148
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149 lock->is_set = 0;
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150
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151 DosCreateEventSem(NULL, &lock->changed, 0, 0);
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152
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153 dprintf(("%ld: PyThread_allocate_lock() -> %p\n",
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154 PyThread_get_thread_ident(),
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155 lock->changed));
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156
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157 return (PyThread_type_lock)lock;
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158 #endif
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159 }
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160
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161 void
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162 PyThread_free_lock(PyThread_type_lock aLock)
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163 {
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164 #if !defined(PYCC_GCC)
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165 type_os2_lock lock = (type_os2_lock)aLock;
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166 #endif
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167
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168 dprintf(("%ld: PyThread_free_lock(%p) called\n",
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169 PyThread_get_thread_ident(),aLock));
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170
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171 #if defined(PYCC_GCC)
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172 if (aLock) {
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173 _fmutex_close((_fmutex *)aLock);
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174 free((_fmutex *)aLock);
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175 }
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176 #else
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177 DosCloseEventSem(lock->changed);
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178 free(aLock);
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179 #endif
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180 }
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181
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182 /*
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183 * Return 1 on success if the lock was acquired
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184 *
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185 * and 0 if the lock was not acquired.
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186 */
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187 int
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188 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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189 {
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190 #if !defined(PYCC_GCC)
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191 int done = 0;
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192 ULONG count;
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193 PID pid = 0;
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194 TID tid = 0;
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195 type_os2_lock lock = (type_os2_lock)aLock;
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196 #endif
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197
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198 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n",
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199 PyThread_get_thread_ident(),
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200 aLock,
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201 waitflag));
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202
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203 #if defined(PYCC_GCC)
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204 /* always successful if the lock doesn't exist */
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205 if (aLock &&
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206 _fmutex_request((_fmutex *)aLock, waitflag ? 0 : _FMR_NOWAIT))
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207 return 0;
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208 #else
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209 while (!done) {
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210 /* if the lock is currently set, we have to wait for
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211 * the state to change
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212 */
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213 if (lock->is_set) {
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214 if (!waitflag)
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215 return 0;
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216 DosWaitEventSem(lock->changed, SEM_INDEFINITE_WAIT);
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217 }
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218
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219 /* enter a critical section and try to get the semaphore. If
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220 * it is still locked, we will try again.
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221 */
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222 if (DosEnterCritSec())
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223 return 0;
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224
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225 if (!lock->is_set) {
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226 lock->is_set = 1;
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227 DosResetEventSem(lock->changed, &count);
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228 done = 1;
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229 }
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230
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231 DosExitCritSec();
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232 }
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233 #endif
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234
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235 return 1;
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236 }
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237
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238 void PyThread_release_lock(PyThread_type_lock aLock)
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239 {
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240 #if !defined(PYCC_GCC)
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241 type_os2_lock lock = (type_os2_lock)aLock;
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242 #endif
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243
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244 dprintf(("%ld: PyThread_release_lock(%p) called\n",
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245 PyThread_get_thread_ident(),
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246 aLock));
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247
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248 #if defined(PYCC_GCC)
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249 if (aLock)
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250 _fmutex_release((_fmutex *)aLock);
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251 #else
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252 if (!lock->is_set) {
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253 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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254 PyThread_get_thread_ident(),
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255 aLock,
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256 GetLastError()));
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257 return;
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258 }
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259
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260 if (DosEnterCritSec()) {
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261 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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262 PyThread_get_thread_ident(),
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263 aLock,
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264 GetLastError()));
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265 return;
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266 }
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267
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Andrew MacIntyre <andymac@bullseye.apana.org.au>
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268 lock->is_set = 0;
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parents: 26530
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269 DosPostEventSem(lock->changed);
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parents: 26530
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270
8e1567dbcba8 reformat for PEP-7 style conformance
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parents: 26530
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271 DosExitCritSec();
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272 #endif
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Guido van Rossum <guido@python.org>
parents:
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273 }