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annotate Python/thread_os2.h @ 31514:545229dfd909 legacy-trunk

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This is my patch #876198 plus a NEWS entry and a header frob. Remove the ability to use (from C) arbitrary objects supporting the read buffer interface as the co_code member of code objects.
author Michael W. Hudson <mwh@python.net>
date Thu, 12 Feb 2004 15:28:27 +0000
parents 8e1567dbcba8
children e1a7eb832cb5
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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 /*
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18 * Initialization of the C package, should not be needed.
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19 */
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20 static void
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21 PyThread__init_thread(void)
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22 {
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23 }
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24
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25 /*
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26 * Thread support.
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27 */
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28 long
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29 PyThread_start_new_thread(void (*func)(void *), void *arg)
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30 {
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31 int aThread;
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32 int success = 0;
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33
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34 aThread = _beginthread(func,NULL,65536,arg);
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35
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36 if (aThread == -1) {
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37 success = -1;
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38 fprintf(stderr, "aThread failed == %d", aThread);
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39 dprintf(("_beginthread failed. return %ld\n", errno));
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40 }
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41
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42 return success;
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43 }
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44
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45 long
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46 PyThread_get_thread_ident(void)
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47 {
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48 #if !defined(PYCC_GCC)
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49 PPIB pib;
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50 PTIB tib;
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51 #endif
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52
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53 if (!initialized)
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54 PyThread_init_thread();
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55
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56 #if defined(PYCC_GCC)
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57 return _gettid();
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58 #else
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59 DosGetInfoBlocks(&tib, &pib);
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60 return tib->tib_ptib2->tib2_ultid;
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61 #endif
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62 }
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63
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64 static void
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65 do_PyThread_exit_thread(int no_cleanup)
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66 {
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67 dprintf(("%ld: PyThread_exit_thread called\n",
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68 PyThread_get_thread_ident()));
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69 if (!initialized)
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70 if (no_cleanup)
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71 _exit(0);
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72 else
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73 exit(0);
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74 _endthread();
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75 }
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76
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77 void
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78 PyThread_exit_thread(void)
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79 {
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80 do_PyThread_exit_thread(0);
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81 }
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82
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83 void
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84 PyThread__exit_thread(void)
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85 {
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86 do_PyThread_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
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91 do_PyThread_exit_prog(int status, int no_cleanup)
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92 {
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93 dprintf(("PyThread_exit_prog(%d) called\n", status));
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94 if (!initialized)
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95 if (no_cleanup)
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96 _exit(status);
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97 else
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98 exit(status);
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99 }
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100
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101 void
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102 PyThread_exit_prog(int status)
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103 {
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104 do_PyThread_exit_prog(status, 0);
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105 }
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106
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107 void
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108 PyThread__exit_prog(int status)
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109 {
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110 do_PyThread_exit_prog(status, 1);
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111 }
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112 #endif /* NO_EXIT_PROG */
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113
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114 /*
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115 * Lock support. This is implemented with an event semaphore and critical
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116 * sections to make it behave more like a posix mutex than its OS/2
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117 * counterparts.
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118 */
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119
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120 typedef struct os2_lock_t {
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121 int is_set;
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122 HEV changed;
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123 } *type_os2_lock;
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124
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125 PyThread_type_lock
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126 PyThread_allocate_lock(void)
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127 {
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128 #if defined(PYCC_GCC)
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129 _fmutex *sem = malloc(sizeof(_fmutex));
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130 if (!initialized)
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131 PyThread_init_thread();
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132 dprintf(("%ld: PyThread_allocate_lock() -> %lx\n",
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133 PyThread_get_thread_ident(),
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134 (long)sem));
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135 if (_fmutex_create(sem, 0)) {
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136 free(sem);
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137 sem = NULL;
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138 }
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139 return (PyThread_type_lock)sem;
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140 #else
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141 APIRET rc;
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142 type_os2_lock lock = (type_os2_lock)malloc(sizeof(struct os2_lock_t));
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143
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144 dprintf(("PyThread_allocate_lock called\n"));
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145 if (!initialized)
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146 PyThread_init_thread();
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147
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148 lock->is_set = 0;
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149
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150 DosCreateEventSem(NULL, &lock->changed, 0, 0);
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151
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152 dprintf(("%ld: PyThread_allocate_lock() -> %p\n",
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153 PyThread_get_thread_ident(),
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154 lock->changed));
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155
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156 return (PyThread_type_lock)lock;
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157 #endif
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158 }
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159
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160 void
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161 PyThread_free_lock(PyThread_type_lock aLock)
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162 {
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163 #if !defined(PYCC_GCC)
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164 type_os2_lock lock = (type_os2_lock)aLock;
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165 #endif
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166
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167 dprintf(("%ld: PyThread_free_lock(%p) called\n",
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168 PyThread_get_thread_ident(),aLock));
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169
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170 #if defined(PYCC_GCC)
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171 if (aLock) {
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172 _fmutex_close((_fmutex *)aLock);
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173 free((_fmutex *)aLock);
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174 }
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175 #else
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176 DosCloseEventSem(lock->changed);
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177 free(aLock);
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178 #endif
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179 }
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180
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181 /*
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182 * Return 1 on success if the lock was acquired
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183 *
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184 * and 0 if the lock was not acquired.
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185 */
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186 int
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187 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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188 {
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189 #if !defined(PYCC_GCC)
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190 int done = 0;
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191 ULONG count;
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192 PID pid = 0;
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193 TID tid = 0;
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194 type_os2_lock lock = (type_os2_lock)aLock;
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195 #endif
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196
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197 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n",
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198 PyThread_get_thread_ident(),
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199 aLock,
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200 waitflag));
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201
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202 #if defined(PYCC_GCC)
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203 /* always successful if the lock doesn't exist */
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204 if (aLock &&
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205 _fmutex_request((_fmutex *)aLock, waitflag ? 0 : _FMR_NOWAIT))
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206 return 0;
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207 #else
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208 while (!done) {
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209 /* if the lock is currently set, we have to wait for
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210 * the state to change
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211 */
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212 if (lock->is_set) {
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213 if (!waitflag)
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214 return 0;
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215 DosWaitEventSem(lock->changed, SEM_INDEFINITE_WAIT);
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216 }
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217
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218 /* enter a critical section and try to get the semaphore. If
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219 * it is still locked, we will try again.
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220 */
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221 if (DosEnterCritSec())
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222 return 0;
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223
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224 if (!lock->is_set) {
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225 lock->is_set = 1;
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226 DosResetEventSem(lock->changed, &count);
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227 done = 1;
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228 }
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229
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230 DosExitCritSec();
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231 }
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232 #endif
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233
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234 return 1;
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235 }
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236
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237 void PyThread_release_lock(PyThread_type_lock aLock)
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238 {
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239 #if !defined(PYCC_GCC)
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240 type_os2_lock lock = (type_os2_lock)aLock;
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241 #endif
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242
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243 dprintf(("%ld: PyThread_release_lock(%p) called\n",
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244 PyThread_get_thread_ident(),
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245 aLock));
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246
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247 #if defined(PYCC_GCC)
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248 if (aLock)
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249 _fmutex_release((_fmutex *)aLock);
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250 #else
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251 if (!lock->is_set) {
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252 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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253 PyThread_get_thread_ident(),
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254 aLock,
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255 GetLastError()));
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256 return;
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257 }
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258
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259 if (DosEnterCritSec()) {
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260 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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261 PyThread_get_thread_ident(),
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262 aLock,
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263 GetLastError()));
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264 return;
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265 }
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266
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267 lock->is_set = 0;
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268 DosPostEventSem(lock->changed);
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269
8e1567dbcba8 reformat for PEP-7 style conformance
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parents: 26530
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270 DosExitCritSec();
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271 #endif
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272 }