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annotate Python/thread.c @ 1004:5d7142ea01b7 legacy-trunk

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adapted SV module to the new svideo library. update thread package.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 02 Sep 1992 11:25:37 +0000
parents a31e07847063
children b33228e3c2c2
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1 #include "thread.h"
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2
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3 <<<<<<< thread.c
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4 #ifndef DEBUG
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5 #define DEBUG
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6 #endif
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7
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8 #ifdef DEBUG
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9 #define dprintf(args) printf args
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10 #else
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11 #define dprintf(args)
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12 #endif
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13
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14 =======
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15 #ifdef DEBUG
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16 #define dprintf(args) printf args
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17 #else
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18 #define dprintf(args)
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19 #endif
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20
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21 >>>>>>> 2.3
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22 #ifdef __sgi
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23 #include <stdlib.h>
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24 #include <stdio.h>
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25 #include <signal.h>
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26 #include <sys/types.h>
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27 #include <sys/prctl.h>
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28 #include <ulocks.h>
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29
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30 #define MAXPROC 100 /* max # of threads that can be started */
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31
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32 static usptr_t *shared_arena;
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33 static ulock_t count_lock; /* protection for some variables */
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34 static ulock_t wait_lock; /* lock used to wait for other threads */
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35 static int waiting_for_threads; /* protected by count_lock */
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36 static int nthreads; /* protected by count_lock */
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37 static int exit_status;
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38 static int do_exit;
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39 static int exiting; /* we're already exiting (for maybe_exit) */
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40 static pid_t my_pid; /* PID of main thread */
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41 static pid_t pidlist[MAXPROC]; /* PIDs of other threads */
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42 static int maxpidindex; /* # of PIDs in pidlist */
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43 #endif
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44 #ifdef sun
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45 #include <lwp/lwp.h>
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46 #include <lwp/stackdep.h>
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47
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48 #define STACKSIZE 1000 /* stacksize for a thread */
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49 #define NSTACKS 2 /* # stacks to be put in cache initialy */
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50
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51 struct lock {
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52 int lock_locked;
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53 cv_t lock_condvar;
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54 mon_t lock_monitor;
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55 };
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56 #endif
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57 #ifdef C_THREADS
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58 #include <cthreads.h>
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59 #endif
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60
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61 #ifdef __STDC__
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62 #define _P(args) args
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63 #define _P0() (void)
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64 #define _P1(v,t) (t)
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65 #define _P2(v1,t1,v2,t2) (t1,t2)
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66 #else
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67 #define _P(args) ()
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68 #define _P0() ()
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69 #define _P1(v,t) (v) t;
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70 #define _P2(v1,t1,v2,t2) (v1,v2) t1; t2;
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71 #endif
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72
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73 static int initialized;
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74
1004
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75 <<<<<<< thread.c
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76 #ifdef __sgi
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77 /*
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78 * This routine is called as a signal handler when another thread
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79 * exits. When that happens, we must see whether we have to exit as
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80 * well (because of an exit_prog()) or whether we should continue on.
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81 */
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82 static void exit_sig _P0()
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83 {
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84 dprintf(("exit_sig called\n"));
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85 if (exiting && getpid() == my_pid) {
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86 dprintf(("already exiting\n"));
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87 return;
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88 }
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89 if (do_exit) {
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90 dprintf(("exiting in exit_sig\n"));
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91 exit_thread();
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92 }
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93 }
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94
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95 /*
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96 * This routine is called when a process calls exit(). If that wasn't
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97 * done from the library, we do as if an exit_prog() was intended.
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98 */
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99 static void maybe_exit _P0()
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100 {
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101 dprintf(("maybe_exit called\n"));
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102 if (exiting) {
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103 dprintf(("already exiting\n"));
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104 return;
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105 }
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106 exit_prog(0);
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107 }
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108 #endif
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109
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110 /*
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111 * Initialization.
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112 */
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113 void init_thread _P0()
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114 {
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115 #ifdef __sgi
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116 struct sigaction s;
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117 #endif
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118
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119 dprintf(("init_thread called\n"));
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120 if (initialized)
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121 return;
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122 initialized = 1;
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123
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124 #ifdef __sgi
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125 my_pid = getpid(); /* so that we know which is the main thread */
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126 atexit(maybe_exit);
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127 s.sa_handler = exit_sig;
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128 sigemptyset(&s.sa_mask);
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129 sigaddset(&s.sa_mask, SIGUSR1);
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130 s.sa_flags = 0;
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131 sigaction(SIGUSR1, &s, 0);
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132 prctl(PR_SETEXITSIG, SIGUSR1);
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133 usconfig(CONF_ARENATYPE, US_SHAREDONLY);
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134 /*usconfig(CONF_LOCKTYPE, US_DEBUGPLUS);*/
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135 shared_arena = usinit(tmpnam(0));
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136 count_lock = usnewlock(shared_arena);
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137 (void) usinitlock(count_lock);
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138 wait_lock = usnewlock(shared_arena);
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139 #endif
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140 #ifdef sun
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141 lwp_setstkcache(STACKSIZE, NSTACKS);
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142 #endif
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143 #ifdef C_THREADS
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144 cthread_init();
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145 #endif
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146 }
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147
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148 /*
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149 * Thread support.
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150 */
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151 =======
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152 #ifdef __sgi
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153 /*
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154 * This routine is called as a signal handler when another thread
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155 * exits. When that happens, we must see whether we have to exit as
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156 * well (because of an exit_prog()) or whether we should continue on.
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157 */
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158 static void exit_sig _P0()
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159 {
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160 dprintf(("exit_sig called\n"));
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161 if (exiting && getpid() == my_pid) {
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162 dprintf(("already exiting\n"));
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163 return;
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164 }
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165 if (do_exit) {
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166 dprintf(("exiting in exit_sig\n"));
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167 exit_thread();
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168 }
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169 }
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170
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171 /*
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172 * This routune is called when a process calls exit(). If that wasn't
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173 * done from the library, we do as if an exit_prog() was intended.
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174 */
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175 static void maybe_exit _P0()
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176 {
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177 dprintf(("maybe_exit called\n"));
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178 if (exiting) {
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179 dprintf(("already exiting\n"));
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180 return;
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181 }
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182 exit_prog(0);
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183 }
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184 #endif
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185
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186 /*
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187 * Initialization.
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188 */
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189 void init_thread _P0()
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190 {
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191 #ifdef __sgi
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192 struct sigaction s;
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193 #endif
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194
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195 dprintf(("init_thread called\n"));
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196 if (initialized)
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197 return;
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198 initialized = 1;
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199
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200 #ifdef __sgi
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201 my_pid = getpid(); /* so that we know which is the main thread */
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202 atexit(maybe_exit);
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203 s.sa_handler = exit_sig;
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204 sigemptyset(&s.sa_mask);
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205 sigaddset(&s.sa_mask, SIGUSR1);
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206 s.sa_flags = 0;
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207 sigaction(SIGUSR1, &s, 0);
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208 prctl(PR_SETEXITSIG, SIGUSR1);
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209 usconfig(CONF_ARENATYPE, US_SHAREDONLY);
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210 /*usconfig(CONF_LOCKTYPE, US_DEBUGPLUS);*/
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211 shared_arena = usinit(tmpnam(0));
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212 count_lock = usnewlock(shared_arena);
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213 (void) usinitlock(count_lock);
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214 wait_lock = usnewlock(shared_arena);
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215 #endif
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216 #ifdef sun
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217 lwp_setstkcache(STACKSIZE, NSTACKS);
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218 #endif
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219 #ifdef C_THREADS
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220 cthread_init();
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221 #endif
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222 }
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223
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224 /*
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225 * Thread support.
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226 */
1004
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227 >>>>>>> 2.3
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228 int start_new_thread _P2(func, void (*func) _P((void *)), arg, void *arg)
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229 {
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230 #ifdef sun
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231 thread_t tid;
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232 #endif
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233 int success = 0; /* init not needed when SOLARIS and */
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234 /* C_THREADS implemented properly */
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235
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236 dprintf(("start_new_thread called\n"));
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237 if (!initialized)
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238 init_thread();
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239 #ifdef __sgi
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240 if (ussetlock(count_lock) == 0)
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241 return 0;
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242 if (maxpidindex >= MAXPROC)
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243 success = -1;
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244 else {
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245 success = sproc(func, PR_SALL, arg);
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246 if (success >= 0) {
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247 nthreads++;
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248 pidlist[maxpidindex++] = success;
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249 }
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250 }
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251 (void) usunsetlock(count_lock);
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252 #endif
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253 #ifdef SOLARIS
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254 (void) thread_create(0, 0, func, arg, THREAD_NEW_LWP);
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255 #endif
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256 #ifdef sun
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257 success = lwp_create(&tid, func, MINPRIO, 0, lwp_newstk(), 1, arg);
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258 #endif
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259 #ifdef C_THREADS
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260 (void) cthread_fork(func, arg);
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261 #endif
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262 return success < 0 ? 0 : 1;
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263 }
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264
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265 static void do_exit_thread _P1(no_cleanup, int no_cleanup)
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266 {
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267 dprintf(("exit_thread called\n"));
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268 if (!initialized)
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269 if (no_cleanup)
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270 _exit(0);
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271 else
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272 exit(0);
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273 #ifdef __sgi
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274 (void) ussetlock(count_lock);
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275 nthreads--;
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276 if (getpid() == my_pid) {
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277 /* main thread; wait for other threads to exit */
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278 exiting = 1;
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279 if (do_exit) {
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280 int i;
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281
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282 /* notify other threads */
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283 for (i = 0; i < maxpidindex; i++)
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284 (void) kill(pidlist[i], SIGUSR1);
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285 }
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286 waiting_for_threads = 1;
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287 ussetlock(wait_lock);
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288 for (;;) {
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289 if (nthreads < 0) {
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290 dprintf(("really exit (%d)\n", exit_status));
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291 if (no_cleanup)
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292 _exit(exit_status);
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293 else
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294 exit(exit_status);
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295 }
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296 usunsetlock(count_lock);
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297 dprintf(("waiting for other threads (%d)\n", nthreads));
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298 ussetlock(wait_lock);
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299 ussetlock(count_lock);
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300 }
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301 }
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302 /* not the main thread */
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303 if (waiting_for_threads) {
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304 dprintf(("main thread is waiting\n"));
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305 usunsetlock(wait_lock);
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306 }
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307 (void) usunsetlock(count_lock);
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308 _exit(0);
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309 #endif
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310 #ifdef SOLARIS
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311 thread_exit();
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312 #endif
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313 #ifdef sun
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314 lwp_destroy(SELF);
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315 #endif
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316 #ifdef C_THREADS
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317 cthread_exit(0);
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318 #endif
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319 }
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320
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321 void exit_thread _P0()
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322 {
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323 do_exit_thread(0);
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324 }
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325
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326 void _exit_thread _P0()
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327 {
961
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328 do_exit_thread(1);
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329 }
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330
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331 static void do_exit_prog _P2(status, int status, no_cleanup, int no_cleanup)
923
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332 {
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333 dprintf(("exit_prog(%d) called\n", status));
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334 if (!initialized)
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335 if (no_cleanup)
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336 _exit(status);
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337 else
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338 exit(status);
923
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339 #ifdef __sgi
961
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340 do_exit = 1;
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341 exit_status = status;
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342 do_exit_thread(no_cleanup);
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343 #endif
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344 #ifdef sun
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345 pod_exit(status);
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346 #endif
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347 }
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348
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349 void exit_prog _P1(status, int status)
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350 {
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351 do_exit_prog(status, 0);
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352 }
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353
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354 void _exit_prog _P1(status, int status)
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355 {
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356 do_exit_prog(status, 1);
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357 }
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358
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359 /*
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360 * Lock support.
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361 */
923
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362 type_lock allocate_lock _P0()
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363 {
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364 #ifdef __sgi
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365 ulock_t lock;
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366 #endif
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367 #ifdef sun
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368 struct lock *lock;
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369 extern char *malloc();
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370 #endif
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371
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372 dprintf(("allocate_lock called\n"));
923
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373 if (!initialized)
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374 init_thread();
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375
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376 #ifdef __sgi
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377 lock = usnewlock(shared_arena);
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378 (void) usinitlock(lock);
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379 #endif
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380 #ifdef sun
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381 lock = (struct lock *) malloc(sizeof(struct lock));
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382 lock->lock_locked = 0;
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383 (void) mon_create(&lock->lock_monitor);
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384 (void) cv_create(&lock->lock_condvar, lock->lock_monitor);
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385 #endif
961
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386 dprintf(("allocate_lock() -> %lx\n", (long)lock));
923
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387 return (type_lock) lock;
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388 }
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389
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
390 void free_lock _P1(lock, type_lock lock)
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391 {
961
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392 dprintf(("free_lock(%lx) called\n", (long)lock));
923
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393 #ifdef __sgi
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394 usfreelock((ulock_t) lock, shared_arena);
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diff changeset
395 #endif
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396 #ifdef sun
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397 mon_destroy(((struct lock *) lock)->lock_monitor);
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398 free((char *) lock);
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diff changeset
399 #endif
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400 }
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401
72aceed365d4 * Makefile adapted to changes below.
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402 int acquire_lock _P2(lock, type_lock lock, waitflag, int waitflag)
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403 {
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
404 int success;
72aceed365d4 * Makefile adapted to changes below.
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405
961
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diff changeset
406 dprintf(("acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
923
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407 #ifdef __sgi
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
408 if (waitflag)
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
409 success = ussetlock((ulock_t) lock);
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
410 else
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
411 success = uscsetlock((ulock_t) lock, 1); /* Try it once */
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
412 #endif
72aceed365d4 * Makefile adapted to changes below.
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413 #ifdef sun
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diff changeset
414 success = 0;
72aceed365d4 * Makefile adapted to changes below.
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415
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416 (void) mon_enter(((struct lock *) lock)->lock_monitor);
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417 if (waitflag)
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418 while (((struct lock *) lock)->lock_locked)
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419 cv_wait(((struct lock *) lock)->lock_condvar);
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420 if (!((struct lock *) lock)->lock_locked) {
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421 success = 1;
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422 ((struct lock *) lock)->lock_locked = 1;
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423 }
72aceed365d4 * Makefile adapted to changes below.
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424 cv_broadcast(((struct lock *) lock)->lock_condvar);
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Guido van Rossum <guido@python.org>
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425 mon_exit(((struct lock *) lock)->lock_monitor);
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426 #endif
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427 dprintf(("acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
923
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428 return success;
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429 }
72aceed365d4 * Makefile adapted to changes below.
Guido van Rossum <guido@python.org>
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430
72aceed365d4 * Makefile adapted to changes below.
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431 void release_lock _P1(lock, type_lock lock)
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432 {
961
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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433 dprintf(("release_lock(%lx) called\n", (long)lock));
923
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434 #ifdef __sgi
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Guido van Rossum <guido@python.org>
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435 (void) usunsetlock((ulock_t) lock);
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Guido van Rossum <guido@python.org>
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436 #endif
72aceed365d4 * Makefile adapted to changes below.
Guido van Rossum <guido@python.org>
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437 #ifdef sun
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Guido van Rossum <guido@python.org>
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438 (void) mon_enter(((struct lock *) lock)->lock_monitor);
72aceed365d4 * Makefile adapted to changes below.
Guido van Rossum <guido@python.org>
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439 ((struct lock *) lock)->lock_locked = 0;
72aceed365d4 * Makefile adapted to changes below.
Guido van Rossum <guido@python.org>
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440 cv_broadcast(((struct lock *) lock)->lock_condvar);
72aceed365d4 * Makefile adapted to changes below.
Guido van Rossum <guido@python.org>
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441 mon_exit(((struct lock *) lock)->lock_monitor);
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442 #endif
72aceed365d4 * Makefile adapted to changes below.
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443 }
72aceed365d4 * Makefile adapted to changes below.
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444
961
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445 /*
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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446 * Semaphore support.
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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447 */
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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448 type_sema allocate_sema _P1(value, int value)
923
72aceed365d4 * Makefile adapted to changes below.
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449 {
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
450 #ifdef __sgi
961
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451 usema_t *sema;
923
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452 #endif
961
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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parents: 926
diff changeset
453
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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parents: 926
diff changeset
454 dprintf(("allocate_sema called\n"));
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
455
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
456 #ifdef __sgi
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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diff changeset
457 sema = usnewsema(shared_arena, value);
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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458 dprintf(("allocate_sema() -> %lx\n", (long) sema));
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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diff changeset
459 return (type_sema) sema;
923
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460 #endif
72aceed365d4 * Makefile adapted to changes below.
Guido van Rossum <guido@python.org>
parents:
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461 }
961
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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462
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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diff changeset
463 void free_sema _P1(sema, type_sema sema)
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
464 {
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
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parents: 926
diff changeset
465 dprintf(("free_sema(%lx) called\n", (long) sema));
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
466 #ifdef __sgi
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467 usfreesema((usema_t *) sema, shared_arena);
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Guido van Rossum <guido@python.org>
parents: 926
diff changeset
468 #endif
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
469 }
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
470
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
471 void down_sema _P1(sema, type_sema sema)
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
472 {
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
473 dprintf(("down_sema(%lx) called\n", (long) sema));
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
474 #ifdef __sgi
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
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475 (void) uspsema((usema_t *) sema);
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
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diff changeset
476 #endif
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
477 dprintf(("down_sema(%lx) return\n", (long) sema));
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
478 }
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
479
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
480 void up_sema _P1(sema, type_sema sema)
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
481 {
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
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diff changeset
482 dprintf(("up_sema(%lx)\n", (long) sema));
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
483 #ifdef __sgi
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
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diff changeset
484 (void) usvsema((usema_t *) sema);
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
parents: 926
diff changeset
485 #endif
a31e07847063 New thread.c from Sjoerd, supports _exit_prog(). Use this in goaway()
Guido van Rossum <guido@python.org>
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diff changeset
486 }