Mercurial > cpython-lru_cache-weakref

annotate Python/thread_sgi.h @ 67965:a222a015e28d 3.2 v3.2

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Make a 3.2 maintenance branch.
author Georg Brandl <georg@python.org>
date Sun, 20 Feb 2011 10:31:59 +0000
parents cab14be0ada1
children b36cb4602e21
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1
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2 #include <stdlib.h>
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3 #include <stdio.h>
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4 #include <signal.h>
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5 #include <sys/types.h>
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6 #include <sys/wait.h>
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7 #include <sys/prctl.h>
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8 #include <ulocks.h>
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9 #include <errno.h>
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10
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11 #define HDR_SIZE 2680 /* sizeof(ushdr_t) */
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12 #define MAXPROC 100 /* max # of threads that can be started */
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13
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14 static usptr_t *shared_arena;
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15 static ulock_t count_lock; /* protection for some variables */
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16 static ulock_t wait_lock; /* lock used to wait for other threads */
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17 static int waiting_for_threads; /* protected by count_lock */
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18 static int nthreads; /* protected by count_lock */
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19 static int exit_status;
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20 static int exiting; /* we're already exiting (for maybe_exit) */
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21 static pid_t my_pid; /* PID of main thread */
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22 static struct pidlist {
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23 pid_t parent;
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24 pid_t child;
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25 } pidlist[MAXPROC]; /* PIDs of other threads; protected by count_lock */
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26 static int maxpidindex; /* # of PIDs in pidlist */
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27 /*
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28 * Initialization.
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29 */
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30 static void PyThread__init_thread(void)
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31 {
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32 #ifdef USE_DL
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33 long addr, size;
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34 #endif /* USE_DL */
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35
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36
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37 #ifdef USE_DL
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38 if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
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39 perror("usconfig - CONF_INITSIZE (check)");
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40 if (usconfig(CONF_INITSIZE, size) < 0)
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41 perror("usconfig - CONF_INITSIZE (reset)");
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42 addr = (long) dl_getrange(size + HDR_SIZE);
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43 dprintf(("trying to use addr %p-%p for shared arena\n", addr, addr+size));
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44 errno = 0;
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45 if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 && errno != 0)
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46 perror("usconfig - CONF_ATTACHADDR (set)");
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47 #endif /* USE_DL */
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48 if (usconfig(CONF_INITUSERS, 16) < 0)
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49 perror("usconfig - CONF_INITUSERS");
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50 my_pid = getpid(); /* so that we know which is the main thread */
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51 if (usconfig(CONF_ARENATYPE, US_SHAREDONLY) < 0)
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52 perror("usconfig - CONF_ARENATYPE");
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53 usconfig(CONF_LOCKTYPE, US_DEBUG); /* XXX */
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54 #ifdef Py_DEBUG
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55 if (thread_debug & 4)
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56 usconfig(CONF_LOCKTYPE, US_DEBUGPLUS);
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57 else if (thread_debug & 2)
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58 usconfig(CONF_LOCKTYPE, US_DEBUG);
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59 #endif /* Py_DEBUG */
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60 if ((shared_arena = usinit(tmpnam(0))) == 0)
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61 perror("usinit");
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62 #ifdef USE_DL
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63 if (usconfig(CONF_ATTACHADDR, addr) < 0) /* reset address */
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64 perror("usconfig - CONF_ATTACHADDR (reset)");
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65 #endif /* USE_DL */
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66 if ((count_lock = usnewlock(shared_arena)) == NULL)
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67 perror("usnewlock (count_lock)");
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68 (void) usinitlock(count_lock);
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69 if ((wait_lock = usnewlock(shared_arena)) == NULL)
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70 perror("usnewlock (wait_lock)");
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71 dprintf(("arena start: %p, arena size: %ld\n", shared_arena, (long) usconfig(CONF_GETSIZE, shared_arena)));
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72 }
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73
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74 /*
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75 * Thread support.
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76 */
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77
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78 static void clean_threads(void)
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79 {
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80 int i, j;
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81 pid_t mypid, pid;
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82
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83 /* clean up any exited threads */
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84 mypid = getpid();
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85 i = 0;
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86 while (i < maxpidindex) {
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87 if (pidlist[i].parent == mypid && (pid = pidlist[i].child) > 0) {
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88 pid = waitpid(pid, 0, WNOHANG);
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89 if (pid > 0) {
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90 /* a thread has exited */
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91 pidlist[i] = pidlist[--maxpidindex];
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92 /* remove references to children of dead proc */
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93 for (j = 0; j < maxpidindex; j++)
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94 if (pidlist[j].parent == pid)
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95 pidlist[j].child = -1;
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96 continue; /* don't increment i */
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97 }
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98 }
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99 i++;
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100 }
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101 /* clean up the list */
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102 i = 0;
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103 while (i < maxpidindex) {
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104 if (pidlist[i].child == -1) {
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105 pidlist[i] = pidlist[--maxpidindex];
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106 continue; /* don't increment i */
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107 }
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108 i++;
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109 }
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110 }
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111
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112 long PyThread_start_new_thread(void (*func)(void *), void *arg)
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113 {
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114 #ifdef USE_DL
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115 long addr, size;
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116 static int local_initialized = 0;
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117 #endif /* USE_DL */
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118 int success = 0; /* init not needed when SOLARIS_THREADS and */
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119 /* C_THREADS implemented properly */
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120
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121 dprintf(("PyThread_start_new_thread called\n"));
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122 if (!initialized)
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123 PyThread_init_thread();
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124 switch (ussetlock(count_lock)) {
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125 case 0: return 0;
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126 case -1: perror("ussetlock (count_lock)");
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127 }
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128 if (maxpidindex >= MAXPROC)
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129 success = -1;
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130 else {
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131 #ifdef USE_DL
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132 if (!local_initialized) {
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133 if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
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134 perror("usconfig - CONF_INITSIZE (check)");
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135 if (usconfig(CONF_INITSIZE, size) < 0)
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136 perror("usconfig - CONF_INITSIZE (reset)");
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137 addr = (long) dl_getrange(size + HDR_SIZE);
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138 dprintf(("trying to use addr %p-%p for sproc\n",
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139 addr, addr+size));
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140 errno = 0;
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141 if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 &&
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142 errno != 0)
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143 perror("usconfig - CONF_ATTACHADDR (set)");
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144 }
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145 #endif /* USE_DL */
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146 clean_threads();
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147 if ((success = sproc(func, PR_SALL, arg)) < 0)
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148 perror("sproc");
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149 #ifdef USE_DL
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150 if (!local_initialized) {
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151 if (usconfig(CONF_ATTACHADDR, addr) < 0)
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152 /* reset address */
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153 perror("usconfig - CONF_ATTACHADDR (reset)");
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154 local_initialized = 1;
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155 }
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156 #endif /* USE_DL */
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157 if (success >= 0) {
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158 nthreads++;
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159 pidlist[maxpidindex].parent = getpid();
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160 pidlist[maxpidindex++].child = success;
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161 dprintf(("pidlist[%d] = %d\n",
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162 maxpidindex-1, success));
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163 }
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164 }
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165 if (usunsetlock(count_lock) < 0)
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166 perror("usunsetlock (count_lock)");
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167 return success;
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168 }
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169
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170 long PyThread_get_thread_ident(void)
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171 {
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172 return getpid();
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173 }
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174
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175 void PyThread_exit_thread(void)
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176 {
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177 dprintf(("PyThread_exit_thread called\n"));
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178 if (!initialized)
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179 exit(0);
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180 if (ussetlock(count_lock) < 0)
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181 perror("ussetlock (count_lock)");
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182 nthreads--;
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183 if (getpid() == my_pid) {
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184 /* main thread; wait for other threads to exit */
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185 exiting = 1;
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186 waiting_for_threads = 1;
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187 if (ussetlock(wait_lock) < 0)
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188 perror("ussetlock (wait_lock)");
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189 for (;;) {
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190 if (nthreads < 0) {
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191 dprintf(("really exit (%d)\n", exit_status));
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192 exit(exit_status);
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193 }
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194 if (usunsetlock(count_lock) < 0)
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195 perror("usunsetlock (count_lock)");
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196 dprintf(("waiting for other threads (%d)\n", nthreads));
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197 if (ussetlock(wait_lock) < 0)
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198 perror("ussetlock (wait_lock)");
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199 if (ussetlock(count_lock) < 0)
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200 perror("ussetlock (count_lock)");
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201 }
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202 }
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203 /* not the main thread */
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204 if (waiting_for_threads) {
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205 dprintf(("main thread is waiting\n"));
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206 if (usunsetlock(wait_lock) < 0)
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207 perror("usunsetlock (wait_lock)");
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208 }
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209 if (usunsetlock(count_lock) < 0)
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210 perror("usunsetlock (count_lock)");
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211 _exit(0);
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212 }
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213
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214 /*
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215 * Lock support.
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216 */
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217 PyThread_type_lock PyThread_allocate_lock(void)
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218 {
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219 ulock_t lock;
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220
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221 dprintf(("PyThread_allocate_lock called\n"));
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222 if (!initialized)
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223 PyThread_init_thread();
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224
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225 if ((lock = usnewlock(shared_arena)) == NULL)
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226 perror("usnewlock");
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227 (void) usinitlock(lock);
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228 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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229 return (PyThread_type_lock) lock;
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230 }
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231
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232 void PyThread_free_lock(PyThread_type_lock lock)
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233 {
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234 dprintf(("PyThread_free_lock(%p) called\n", lock));
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235 usfreelock((ulock_t) lock, shared_arena);
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236 }
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237
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238 int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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239 {
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240 int success;
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241
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242 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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243 errno = 0; /* clear it just in case */
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244 if (waitflag)
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245 success = ussetlock((ulock_t) lock);
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246 else
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247 success = uscsetlock((ulock_t) lock, 1); /* Try it once */
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248 if (success < 0)
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249 perror(waitflag ? "ussetlock" : "uscsetlock");
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250 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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251 return success;
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252 }
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253
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254 void PyThread_release_lock(PyThread_type_lock lock)
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255 {
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256 dprintf(("PyThread_release_lock(%p) called\n", lock));
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257 if (usunsetlock((ulock_t) lock) < 0)
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258 perror("usunsetlock");
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a9dd2e1ea5c9 Split thread.c into a number of system-specific files.
Guido van Rossum <guido@python.org>
parents:
diff changeset
259 }