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annotate Python/thread_pth.h @ 16862:77a5470299db legacy-trunk

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Add warning/error handlin for problematic nested scopes cases as described in PEP 227. symtable_check_unoptimized() warns about import * and exec with "in" when it is used in a function that contains a nested function with free variables. Warnings are issued unless nested scopes are in effect, in which case these are SyntaxErrors. symtable_check_shadow() warns about assignments in a function scope that shadow free variables defined in a nested scope. This will always generate a warning -- and will behave differently with nested scopes than without. Restore full checking for free vars in children, even when nested scopes are not enabled. This is needed to support warnings for shadowing. Change symtable_warn() to return an int-- the return value of PyErr_WarnExplicit. Sundry cleanup: Remove commented out code. Break long lines.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Wed, 28 Feb 2001 22:54:51 +0000
parents 5aa8c5aaffad
children ebfd87e87884
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* GNU pth threads interface
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3 http://www.gnu.org/software/pth
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4 2000-05-03 Andy Dustman <andy@dustman.net>
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5
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6 Adapted from Posix threads interface
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7 12 May 1997 -- david arnold <davida@pobox.com>
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8 */
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9
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <pth.h>
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13
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14 /* A pth mutex isn't sufficient to model the Python lock type
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15 * because pth mutexes can be acquired multiple times by the
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16 * same thread.
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17 *
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18 * The pth_lock struct implements a Python lock as a "locked?" bit
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19 * and a <condition, mutex> pair. In general, if the bit can be acquired
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20 * instantly, it is, else the pair is used to block the thread until the
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21 * bit is cleared.
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22 */
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23
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24 typedef struct {
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25 char locked; /* 0=unlocked, 1=locked */
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26 /* a <cond, mutex> pair to handle an acquire of a locked lock */
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27 pth_cond_t lock_released;
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28 pth_mutex_t mut;
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29 } pth_lock;
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30
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31 #define CHECK_STATUS(name) if (status == -1) { printf("%d ", status); perror(name); error = 1; }
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32
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33 /*
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34 * Initialization.
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35 */
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36
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37 static void PyThread__init_thread(void)
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38 {
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39 pth_init();
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40 }
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41
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42 /*
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43 * Thread support.
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44 */
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45
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46
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47 int PyThread_start_new_thread(void (*func)(void *), void *arg)
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48 {
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49 pth_t th;
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50 dprintf(("PyThread_start_new_thread called\n"));
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51 if (!initialized)
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52 PyThread_init_thread();
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53
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54 th = pth_spawn(PTH_ATTR_DEFAULT,
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55 (void* (*)(void *))func,
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56 (void *)arg
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57 );
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58
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59 return th == NULL ? 0 : 1;
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60 }
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61
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62 long PyThread_get_thread_ident(void)
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63 {
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64 volatile pth_t threadid;
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65 if (!initialized)
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66 PyThread_init_thread();
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67 /* Jump through some hoops for Alpha OSF/1 */
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68 threadid = pth_self();
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69 return (long) *(long *) &threadid;
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70 }
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71
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72 static void do_PyThread_exit_thread(int no_cleanup)
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73 {
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74 dprintf(("PyThread_exit_thread called\n"));
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75 if (!initialized) {
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76 if (no_cleanup)
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77 _exit(0);
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78 else
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79 exit(0);
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80 }
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81 }
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82
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83 void PyThread_exit_thread(void)
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84 {
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85 do_PyThread_exit_thread(0);
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86 }
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87
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88 void PyThread__exit_thread(void)
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89 {
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90 do_PyThread_exit_thread(1);
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91 }
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92
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93 #ifndef NO_EXIT_PROG
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94 static void do_PyThread_exit_prog(int status, int no_cleanup)
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95 {
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96 dprintf(("PyThread_exit_prog(%d) called\n", status));
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97 if (!initialized)
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98 if (no_cleanup)
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99 _exit(status);
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100 else
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101 exit(status);
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102 }
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103
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104 void PyThread_exit_prog(int status)
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105 {
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106 do_PyThread_exit_prog(status, 0);
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107 }
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108
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109 void 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.
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117 */
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118 PyThread_type_lock PyThread_allocate_lock(void)
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119 {
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120 pth_lock *lock;
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121 int status, error = 0;
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122
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123 dprintf(("PyThread_allocate_lock called\n"));
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124 if (!initialized)
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125 PyThread_init_thread();
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126
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127 lock = (pth_lock *) malloc(sizeof(pth_lock));
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128 memset((void *)lock, '\0', sizeof(pth_lock));
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129 if (lock) {
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130 lock->locked = 0;
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131 status = pth_mutex_init(&lock->mut);
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132 CHECK_STATUS("pth_mutex_init");
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133 status = pth_cond_init(&lock->lock_released);
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134 CHECK_STATUS("pth_cond_init");
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135 if (error) {
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136 free((void *)lock);
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137 lock = NULL;
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138 }
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139 }
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140 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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141 return (PyThread_type_lock) lock;
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142 }
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143
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144 void PyThread_free_lock(PyThread_type_lock lock)
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145 {
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146 pth_lock *thelock = (pth_lock *)lock;
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147
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148 dprintf(("PyThread_free_lock(%p) called\n", lock));
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149
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150 free((void *)thelock);
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151 }
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152
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153 int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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154 {
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155 int success;
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156 pth_lock *thelock = (pth_lock *)lock;
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157 int status, error = 0;
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158
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159 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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160
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161 status = pth_mutex_acquire(&thelock->mut, !waitflag, NULL);
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162 CHECK_STATUS("pth_mutex_acquire[1]");
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163 success = thelock->locked == 0;
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164 if (success) thelock->locked = 1;
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165 status = pth_mutex_release( &thelock->mut );
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166 CHECK_STATUS("pth_mutex_release[1]");
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167
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168 if ( !success && waitflag ) {
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169 /* continue trying until we get the lock */
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170
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171 /* mut must be locked by me -- part of the condition
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172 * protocol */
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173 status = pth_mutex_acquire( &thelock->mut, !waitflag, NULL );
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174 CHECK_STATUS("pth_mutex_acquire[2]");
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175 while ( thelock->locked ) {
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176 status = pth_cond_await(&thelock->lock_released,
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177 &thelock->mut, NULL);
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178 CHECK_STATUS("pth_cond_await");
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179 }
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180 thelock->locked = 1;
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181 status = pth_mutex_release( &thelock->mut );
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182 CHECK_STATUS("pth_mutex_release[2]");
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183 success = 1;
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184 }
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185 if (error) success = 0;
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186 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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187 return success;
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188 }
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189
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190 void PyThread_release_lock(PyThread_type_lock lock)
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191 {
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192 pth_lock *thelock = (pth_lock *)lock;
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193 int status, error = 0;
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194
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195 dprintf(("PyThread_release_lock(%p) called\n", lock));
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196
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197 status = pth_mutex_acquire( &thelock->mut, 0, NULL );
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198 CHECK_STATUS("pth_mutex_acquire[3]");
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199
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200 thelock->locked = 0;
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201
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202 status = pth_mutex_release( &thelock->mut );
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203 CHECK_STATUS("pth_mutex_release[3]");
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204
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205 /* wake up someone (anyone, if any) waiting on the lock */
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206 status = pth_cond_notify( &thelock->lock_released, 0 );
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207 CHECK_STATUS("pth_cond_notify");
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208 }
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209
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210 /*
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211 * Semaphore support.
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212 */
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213
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214 struct semaphore {
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215 pth_mutex_t mutex;
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216 pth_cond_t cond;
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217 int value;
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218 };
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219
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220 PyThread_type_sema PyThread_allocate_sema(int value)
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221 {
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222 struct semaphore *sema;
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223 int status, error = 0;
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224
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225 dprintf(("PyThread_allocate_sema called\n"));
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226 if (!initialized)
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227 PyThread_init_thread();
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228
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229 sema = (struct semaphore *) malloc(sizeof(struct semaphore));
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230 if (sema != NULL) {
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231 sema->value = value;
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232 status = pth_mutex_init(&sema->mutex);
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233 CHECK_STATUS("pth_mutex_init");
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234 status = pth_cond_init(&sema->cond);
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235 CHECK_STATUS("pth_mutex_init");
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236 if (error) {
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237 free((void *) sema);
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238 sema = NULL;
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239 }
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240 }
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241 dprintf(("PyThread_allocate_sema() -> %p\n", sema));
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242 return (PyThread_type_sema) sema;
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243 }
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244
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245 void PyThread_free_sema(PyThread_type_sema sema)
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246 {
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247 struct semaphore *thesema = (struct semaphore *) sema;
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248
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249 dprintf(("PyThread_free_sema(%p) called\n", sema));
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250 free((void *) thesema);
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251 }
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252
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253 int PyThread_down_sema(PyThread_type_sema sema, int waitflag)
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254 {
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255 int status, error = 0, success;
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256 struct semaphore *thesema = (struct semaphore *) sema;
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257
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258 dprintf(("PyThread_down_sema(%p, %d) called\n", sema, waitflag));
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259 status = pth_mutex_acquire(&thesema->mutex, !waitflag, NULL);
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260 CHECK_STATUS("pth_mutex_acquire");
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261 if (waitflag) {
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262 while (!error && thesema->value <= 0) {
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263 status = pth_cond_await(&thesema->cond,
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264 &thesema->mutex, NULL);
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265 CHECK_STATUS("pth_cond_await");
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266 }
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267 }
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268 if (error)
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269 success = 0;
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270 else if (thesema->value > 0) {
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271 thesema->value--;
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272 success = 1;
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273 }
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274 else
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275 success = 0;
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276 status = pth_mutex_release(&thesema->mutex);
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277 CHECK_STATUS("pth_mutex_release");
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278 dprintf(("PyThread_down_sema(%p) return\n", sema));
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279 return success;
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280 }
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281
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282 void PyThread_up_sema(PyThread_type_sema sema)
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283 {
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284 int status, error = 0;
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285 struct semaphore *thesema = (struct semaphore *) sema;
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286
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287 dprintf(("PyThread_up_sema(%p)\n", sema));
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288 status = pth_mutex_acquire(&thesema->mutex, 0, NULL);
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289 CHECK_STATUS("pth_mutex_acquire");
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290 thesema->value++;
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291 status = pth_cond_notify(&thesema->cond, 1);
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292 CHECK_STATUS("pth_cond_notify");
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293 status = pth_mutex_release(&thesema->mutex);
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294 CHECK_STATUS("pth_mutex_release");
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295 }