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annotate Python/thread_os2.h @ 57673:20b7deb53d4e legacy-trunk

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account for PyObject_IsInstance's new ability to fail
author Benjamin Peterson <benjamin@python.org>
date Sun, 13 Dec 2009 00:54:15 +0000
parents 0a4ad83fd654
children e38335d4df91 df5719c298db
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 /* default thread stack size of 64kB */
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18 #if !defined(THREAD_STACK_SIZE)
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19 #define THREAD_STACK_SIZE 0x10000
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20 #endif
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21
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22 #define OS2_STACKSIZE(x) (x ? x : THREAD_STACK_SIZE)
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23
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24 /*
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25 * Initialization of the C package, should not be needed.
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26 */
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27 static void
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28 PyThread__init_thread(void)
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29 {
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30 }
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31
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32 /*
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33 * Thread support.
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34 */
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35 long
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36 PyThread_start_new_thread(void (*func)(void *), void *arg)
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37 {
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38 int thread_id;
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39
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40 thread_id = _beginthread(func,
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41 NULL,
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42 OS2_STACKSIZE(_pythread_stacksize),
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43 arg);
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44
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45 if (thread_id == -1) {
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46 dprintf(("_beginthread failed. return %ld\n", errno));
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47 }
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48
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49 return thread_id;
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50 }
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51
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52 long
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53 PyThread_get_thread_ident(void)
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54 {
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55 #if !defined(PYCC_GCC)
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56 PPIB pib;
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57 PTIB tib;
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58 #endif
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59
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60 if (!initialized)
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61 PyThread_init_thread();
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62
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63 #if defined(PYCC_GCC)
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64 return _gettid();
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65 #else
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66 DosGetInfoBlocks(&tib, &pib);
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67 return tib->tib_ptib2->tib2_ultid;
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68 #endif
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69 }
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71 static void
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72 do_PyThread_exit_thread(int no_cleanup)
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73 {
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74 dprintf(("%ld: PyThread_exit_thread called\n",
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75 PyThread_get_thread_ident()));
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76 if (!initialized)
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77 if (no_cleanup)
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78 _exit(0);
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79 else
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80 exit(0);
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81 _endthread();
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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(0);
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88 }
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89
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90 void
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91 PyThread__exit_thread(void)
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92 {
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93 do_PyThread_exit_thread(1);
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94 }
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95
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96 #ifndef NO_EXIT_PROG
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97 static void
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98 do_PyThread_exit_prog(int status, int no_cleanup)
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99 {
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100 dprintf(("PyThread_exit_prog(%d) called\n", status));
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101 if (!initialized)
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102 if (no_cleanup)
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103 _exit(status);
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104 else
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105 exit(status);
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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, 0);
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112 }
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113
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114 void
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115 PyThread__exit_prog(int status)
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116 {
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117 do_PyThread_exit_prog(status, 1);
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118 }
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119 #endif /* NO_EXIT_PROG */
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120
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121 /*
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122 * Lock support. This is implemented with an event semaphore and critical
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123 * sections to make it behave more like a posix mutex than its OS/2
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124 * counterparts.
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125 */
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126
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127 typedef struct os2_lock_t {
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128 int is_set;
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129 HEV changed;
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130 } *type_os2_lock;
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131
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132 PyThread_type_lock
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133 PyThread_allocate_lock(void)
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134 {
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135 #if defined(PYCC_GCC)
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136 _fmutex *sem = malloc(sizeof(_fmutex));
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137 if (!initialized)
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138 PyThread_init_thread();
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139 dprintf(("%ld: PyThread_allocate_lock() -> %lx\n",
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140 PyThread_get_thread_ident(),
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141 (long)sem));
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142 if (_fmutex_create(sem, 0)) {
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143 free(sem);
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144 sem = NULL;
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145 }
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146 return (PyThread_type_lock)sem;
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147 #else
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148 APIRET rc;
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149 type_os2_lock lock = (type_os2_lock)malloc(sizeof(struct os2_lock_t));
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150
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151 dprintf(("PyThread_allocate_lock called\n"));
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152 if (!initialized)
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153 PyThread_init_thread();
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154
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155 lock->is_set = 0;
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156
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157 DosCreateEventSem(NULL, &lock->changed, 0, 0);
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158
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159 dprintf(("%ld: PyThread_allocate_lock() -> %p\n",
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160 PyThread_get_thread_ident(),
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161 lock->changed));
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162
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163 return (PyThread_type_lock)lock;
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164 #endif
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165 }
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166
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167 void
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168 PyThread_free_lock(PyThread_type_lock aLock)
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169 {
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170 #if !defined(PYCC_GCC)
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171 type_os2_lock lock = (type_os2_lock)aLock;
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172 #endif
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173
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174 dprintf(("%ld: PyThread_free_lock(%p) called\n",
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175 PyThread_get_thread_ident(),aLock));
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176
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177 #if defined(PYCC_GCC)
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178 if (aLock) {
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179 _fmutex_close((_fmutex *)aLock);
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180 free((_fmutex *)aLock);
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181 }
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182 #else
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183 DosCloseEventSem(lock->changed);
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184 free(aLock);
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185 #endif
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186 }
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187
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188 /*
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189 * Return 1 on success if the lock was acquired
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190 *
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191 * and 0 if the lock was not acquired.
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192 */
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193 int
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194 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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195 {
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196 #if !defined(PYCC_GCC)
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197 int done = 0;
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198 ULONG count;
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199 PID pid = 0;
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200 TID tid = 0;
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201 type_os2_lock lock = (type_os2_lock)aLock;
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202 #endif
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203
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204 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n",
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205 PyThread_get_thread_ident(),
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206 aLock,
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207 waitflag));
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208
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209 #if defined(PYCC_GCC)
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210 /* always successful if the lock doesn't exist */
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211 if (aLock &&
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212 _fmutex_request((_fmutex *)aLock, waitflag ? 0 : _FMR_NOWAIT))
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213 return 0;
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214 #else
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215 while (!done) {
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216 /* if the lock is currently set, we have to wait for
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217 * the state to change
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218 */
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219 if (lock->is_set) {
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220 if (!waitflag)
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221 return 0;
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222 DosWaitEventSem(lock->changed, SEM_INDEFINITE_WAIT);
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223 }
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224
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225 /* enter a critical section and try to get the semaphore. If
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226 * it is still locked, we will try again.
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227 */
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228 if (DosEnterCritSec())
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229 return 0;
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230
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diff changeset
231 if (!lock->is_set) {
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232 lock->is_set = 1;
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233 DosResetEventSem(lock->changed, &count);
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234 done = 1;
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235 }
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236
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diff changeset
237 DosExitCritSec();
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diff changeset
238 }
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239 #endif
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240
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241 return 1;
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242 }
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243
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244 void
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245 PyThread_release_lock(PyThread_type_lock aLock)
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246 {
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247 #if !defined(PYCC_GCC)
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248 type_os2_lock lock = (type_os2_lock)aLock;
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249 #endif
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250
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251 dprintf(("%ld: PyThread_release_lock(%p) called\n",
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252 PyThread_get_thread_ident(),
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253 aLock));
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254
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255 #if defined(PYCC_GCC)
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256 if (aLock)
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257 _fmutex_release((_fmutex *)aLock);
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258 #else
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259 if (!lock->is_set) {
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260 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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diff changeset
261 PyThread_get_thread_ident(),
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diff changeset
262 aLock,
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diff changeset
263 GetLastError()));
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diff changeset
264 return;
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diff changeset
265 }
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266
26531
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267 if (DosEnterCritSec()) {
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268 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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269 PyThread_get_thread_ident(),
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270 aLock,
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271 GetLastError()));
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272 return;
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273 }
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274
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275 lock->is_set = 0;
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276 DosPostEventSem(lock->changed);
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277
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278 DosExitCritSec();
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279 #endif
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280 }
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281
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282 /* minimum/maximum thread stack sizes supported */
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283 #define THREAD_MIN_STACKSIZE 0x8000 /* 32kB */
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284 #define THREAD_MAX_STACKSIZE 0x2000000 /* 32MB */
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285
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286 /* set the thread stack size.
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287 * Return 0 if size is valid, -1 otherwise.
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288 */
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289 static int
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290 _pythread_os2_set_stacksize(size_t size)
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291 {
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292 /* set to default */
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293 if (size == 0) {
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294 _pythread_stacksize = 0;
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295 return 0;
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296 }
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297
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298 /* valid range? */
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299 if (size >= THREAD_MIN_STACKSIZE && size < THREAD_MAX_STACKSIZE) {
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300 _pythread_stacksize = size;
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301 return 0;
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302 }
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303
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304 return -1;
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305 }
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306
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307 #define THREAD_SET_STACKSIZE(x) _pythread_os2_set_stacksize(x)