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annotate Python/thread_os2.h @ 38579:19430cdff2bd legacy-trunk

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clean up function declarations to conform to PEP-7 style.
author Andrew MacIntyre <andymac@bullseye.apana.org.au>
date Sun, 04 Jun 2006 12:59:59 +0000
parents 0b2b076e5908
children c4587a5f5e94
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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 aThread;
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39 int success = 0;
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40
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41 aThread = _beginthread(func,
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42 NULL,
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43 OS2_STACKSIZE(_pythread_stacksize),
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44 arg);
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45
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46 if (aThread == -1) {
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47 success = -1;
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48 fprintf(stderr, "aThread failed == %d", aThread);
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49 dprintf(("_beginthread failed. return %ld\n", errno));
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50 }
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51
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52 return success;
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53 }
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54
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55 long
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56 PyThread_get_thread_ident(void)
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57 {
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58 #if !defined(PYCC_GCC)
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59 PPIB pib;
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60 PTIB tib;
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61 #endif
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62
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63 if (!initialized)
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64 PyThread_init_thread();
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65
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66 #if defined(PYCC_GCC)
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67 return _gettid();
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68 #else
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69 DosGetInfoBlocks(&tib, &pib);
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70 return tib->tib_ptib2->tib2_ultid;
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71 #endif
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72 }
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73
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74 static void
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75 do_PyThread_exit_thread(int no_cleanup)
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76 {
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77 dprintf(("%ld: PyThread_exit_thread called\n",
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78 PyThread_get_thread_ident()));
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79 if (!initialized)
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80 if (no_cleanup)
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81 _exit(0);
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82 else
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83 exit(0);
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84 _endthread();
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85 }
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86
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87 void
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88 PyThread_exit_thread(void)
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89 {
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90 do_PyThread_exit_thread(0);
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91 }
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92
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93 void
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94 PyThread__exit_thread(void)
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95 {
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96 do_PyThread_exit_thread(1);
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97 }
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98
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99 #ifndef NO_EXIT_PROG
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100 static void
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101 do_PyThread_exit_prog(int status, int no_cleanup)
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102 {
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103 dprintf(("PyThread_exit_prog(%d) called\n", status));
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104 if (!initialized)
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105 if (no_cleanup)
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106 _exit(status);
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107 else
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108 exit(status);
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109 }
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110
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111 void
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112 PyThread_exit_prog(int status)
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113 {
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114 do_PyThread_exit_prog(status, 0);
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115 }
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116
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117 void
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118 PyThread__exit_prog(int status)
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119 {
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120 do_PyThread_exit_prog(status, 1);
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121 }
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122 #endif /* NO_EXIT_PROG */
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123
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124 /*
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125 * Lock support. This is implemented with an event semaphore and critical
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126 * sections to make it behave more like a posix mutex than its OS/2
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127 * counterparts.
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128 */
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129
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130 typedef struct os2_lock_t {
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131 int is_set;
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132 HEV changed;
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133 } *type_os2_lock;
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134
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135 PyThread_type_lock
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136 PyThread_allocate_lock(void)
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137 {
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138 #if defined(PYCC_GCC)
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139 _fmutex *sem = malloc(sizeof(_fmutex));
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140 if (!initialized)
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141 PyThread_init_thread();
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142 dprintf(("%ld: PyThread_allocate_lock() -> %lx\n",
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143 PyThread_get_thread_ident(),
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144 (long)sem));
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145 if (_fmutex_create(sem, 0)) {
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146 free(sem);
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147 sem = NULL;
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148 }
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149 return (PyThread_type_lock)sem;
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150 #else
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151 APIRET rc;
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152 type_os2_lock lock = (type_os2_lock)malloc(sizeof(struct os2_lock_t));
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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->is_set = 0;
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159
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160 DosCreateEventSem(NULL, &lock->changed, 0, 0);
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161
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162 dprintf(("%ld: PyThread_allocate_lock() -> %p\n",
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163 PyThread_get_thread_ident(),
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164 lock->changed));
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165
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166 return (PyThread_type_lock)lock;
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167 #endif
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168 }
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169
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170 void
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171 PyThread_free_lock(PyThread_type_lock aLock)
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172 {
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173 #if !defined(PYCC_GCC)
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174 type_os2_lock lock = (type_os2_lock)aLock;
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175 #endif
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176
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177 dprintf(("%ld: PyThread_free_lock(%p) called\n",
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178 PyThread_get_thread_ident(),aLock));
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179
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180 #if defined(PYCC_GCC)
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181 if (aLock) {
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182 _fmutex_close((_fmutex *)aLock);
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183 free((_fmutex *)aLock);
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184 }
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185 #else
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186 DosCloseEventSem(lock->changed);
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187 free(aLock);
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188 #endif
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189 }
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190
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191 /*
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192 * Return 1 on success if the lock was acquired
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193 *
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194 * and 0 if the lock was not acquired.
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195 */
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196 int
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197 PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
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198 {
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199 #if !defined(PYCC_GCC)
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200 int done = 0;
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201 ULONG count;
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202 PID pid = 0;
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203 TID tid = 0;
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204 type_os2_lock lock = (type_os2_lock)aLock;
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205 #endif
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206
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207 dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n",
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208 PyThread_get_thread_ident(),
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209 aLock,
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210 waitflag));
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211
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212 #if defined(PYCC_GCC)
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213 /* always successful if the lock doesn't exist */
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214 if (aLock &&
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215 _fmutex_request((_fmutex *)aLock, waitflag ? 0 : _FMR_NOWAIT))
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216 return 0;
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217 #else
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218 while (!done) {
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219 /* if the lock is currently set, we have to wait for
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220 * the state to change
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221 */
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222 if (lock->is_set) {
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223 if (!waitflag)
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224 return 0;
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225 DosWaitEventSem(lock->changed, SEM_INDEFINITE_WAIT);
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226 }
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227
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228 /* enter a critical section and try to get the semaphore. If
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229 * it is still locked, we will try again.
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230 */
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231 if (DosEnterCritSec())
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232 return 0;
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233
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234 if (!lock->is_set) {
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235 lock->is_set = 1;
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236 DosResetEventSem(lock->changed, &count);
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237 done = 1;
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238 }
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239
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240 DosExitCritSec();
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241 }
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242 #endif
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243
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244 return 1;
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245 }
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246
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247 void
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248 PyThread_release_lock(PyThread_type_lock aLock)
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249 {
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250 #if !defined(PYCC_GCC)
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251 type_os2_lock lock = (type_os2_lock)aLock;
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252 #endif
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253
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254 dprintf(("%ld: PyThread_release_lock(%p) called\n",
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255 PyThread_get_thread_ident(),
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256 aLock));
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257
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258 #if defined(PYCC_GCC)
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259 if (aLock)
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260 _fmutex_release((_fmutex *)aLock);
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261 #else
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262 if (!lock->is_set) {
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263 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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264 PyThread_get_thread_ident(),
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265 aLock,
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266 GetLastError()));
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267 return;
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268 }
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269
26531
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270 if (DosEnterCritSec()) {
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271 dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
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272 PyThread_get_thread_ident(),
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273 aLock,
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274 GetLastError()));
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275 return;
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276 }
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277
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278 lock->is_set = 0;
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279 DosPostEventSem(lock->changed);
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280
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281 DosExitCritSec();
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282 #endif
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283 }
38578
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284
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285 /* minimum/maximum thread stack sizes supported */
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286 #define THREAD_MIN_STACKSIZE 0x8000 /* 32kB */
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287 #define THREAD_MAX_STACKSIZE 0x2000000 /* 32MB */
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288
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289 /* set the thread stack size.
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290 * Return 1 if an exception is pending, 0 otherwise.
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291 */
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292 static int
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293 _pythread_os2_set_stacksize(size_t size)
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294 {
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295 /* set to default */
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296 if (size == 0) {
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297 _pythread_stacksize = 0;
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298 return 0;
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299 }
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300
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301 /* valid range? */
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302 if (size >= THREAD_MIN_STACKSIZE && size < THREAD_MAX_STACKSIZE) {
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303 _pythread_stacksize = size;
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304 return 0;
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305 }
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306 else {
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307 char warning[128];
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308 snprintf(warning,
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309 128,
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310 "thread stack size of %#x bytes not supported on OS/2",
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311 size);
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312 return PyErr_Warn(PyExc_RuntimeWarning, warning);
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313 }
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314 }
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315
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316 #undef THREAD_SET_STACKSIZE
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317 #define THREAD_SET_STACKSIZE(x) _pythread_os2_set_stacksize(x)