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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Linux thread management routines for SDL */
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29
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30 #include "SDL_error.h"
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31 #include "SDL_thread.h"
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32 #include "SDL_systhread.h"
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33
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34 #ifdef FORK_HACK
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35
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36 #include <unistd.h>
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37
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38 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
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39 {
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40 SDL_SetError("Threads are not supported on this platform");
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41 return(-1);
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42 }
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43 void SDL_SYS_SetupThread(void)
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44 {
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45 return;
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46 }
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47 Uint32 SDL_ThreadID(void)
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48 {
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49 return((Uint32)getpid());
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50 }
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51 void SDL_SYS_WaitThread(SDL_Thread *thread)
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52 {
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53 return;
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54 }
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55 void SDL_SYS_KillThread(SDL_Thread *thread)
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56 {
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57 return;
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58 }
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59
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60 #else
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61
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62 #include <signal.h>
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63
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64 #if !defined(MACOSX) /* pthread_sigmask seems to be missing on MacOS X? */
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65 /* List of signals to mask in the subthreads */
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66 static int sig_list[] = {
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67 SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
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68 SIGVTALRM, SIGPROF, 0
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69 };
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70 #endif /* !MACOSX */
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71
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72 #ifdef SDL_USE_PTHREADS
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73
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74 #include <pthread.h>
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75
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76
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77 static void *RunThread(void *data)
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78 {
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79 SDL_RunThread(data);
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80 pthread_exit((void*)0);
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81 return((void *)0); /* Prevent compiler warning */
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82 }
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83
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84 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
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85 {
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86 pthread_attr_t type;
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87
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88 /* Set the thread attributes */
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89 if ( pthread_attr_init(&type) != 0 ) {
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90 SDL_SetError("Couldn't initialize pthread attributes");
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91 return(-1);
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92 }
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93 pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);
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94
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95 /* Create the thread and go! */
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96 if ( pthread_create(&thread->handle, &type, RunThread, args) != 0 ) {
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97 SDL_SetError("Not enough resources to create thread");
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98 return(-1);
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99 }
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100 return(0);
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101 }
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102
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103 void SDL_SYS_SetupThread(void)
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104 {
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105 #if !defined(MACOSX) /* pthread_sigmask seems to be missing on MacOS X? */
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106 int i;
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107 sigset_t mask;
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108
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109 /* Mask asynchronous signals for this thread */
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110 sigemptyset(&mask);
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111 for ( i=0; sig_list[i]; ++i ) {
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112 sigaddset(&mask, sig_list[i]);
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113 }
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114 pthread_sigmask(SIG_BLOCK, &mask, 0);
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115 #endif /* !MACOSX */
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116
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117 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS
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118 /* Allow ourselves to be asynchronously cancelled */
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119 { int oldstate;
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120 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
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121 }
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122 #endif
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123 }
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124
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125 /* WARNING: This may not work for systems with 64-bit pid_t */
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126 Uint32 SDL_ThreadID(void)
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127 {
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128 return((Uint32)pthread_self());
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129 }
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130
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131 void SDL_SYS_WaitThread(SDL_Thread *thread)
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132 {
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133 pthread_join(thread->handle, 0);
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134 }
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135
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136 void SDL_SYS_KillThread(SDL_Thread *thread)
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137 {
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138 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS
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139 pthread_cancel(thread->handle);
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140 #else
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141 #ifdef __FreeBSD__
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142 #warning For some reason, this doesnt actually kill a thread - FreeBSD 3.2
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143 #endif
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144 pthread_kill(thread->handle, SIGKILL);
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145 #endif
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146 }
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147
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148 #else /* Linux-specific clone() based implementation */
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149
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150 #include <stdlib.h>
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151 #include <errno.h>
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152 #include <unistd.h>
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153 #include <sys/wait.h>
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154
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155
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156 /* Stack size for child thread */
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157 #define STACKSIZE 16384*4 /* 16384 is too small */
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158
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159 #ifdef __GLIBC__
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160 #include <sched.h>
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161 #else
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162 /* From <linux/sched.h> */
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163 #define CLONE_VM 0x00000100 /* set if VM shared */
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164 #define CLONE_FS 0x00000200 /* set if fs info shared */
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165 #define CLONE_FILES 0x00000400 /* set if open files shared */
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166 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers shared */
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167 #define CLONE_PID 0x00001000 /* set if pid shared */
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168
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169 /* The infamous "start_thread" function, courtesy Linus Torvalds */
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170 extern int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg);
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171 #endif
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172
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173 static int RunThread(void *data)
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174 {
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175 SDL_RunThread(data);
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176 return(0);
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177 }
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178
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179 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
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180 {
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181 void *stack;
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182
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183 /* Allocate memory for thread stack */
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184 stack = malloc(STACKSIZE);
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185 if ( stack == (void *)0 ) {
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186 SDL_OutOfMemory();
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187 return(-1);
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188 }
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189 thread->data = stack;
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190
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191 /* Adjust the stack since it actually grows down */
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192 stack = (void *) ((char *)stack + STACKSIZE);
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193
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194 /* Create the thread and go! */
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195 thread->handle = clone(RunThread, stack,
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196 (CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND), args);
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197 if ( thread->handle < 0 ) {
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198 free(thread->data);
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199 SDL_SetError("Not enough resources to create thread");
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200 return(-1);
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201 }
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202 return(0);
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203 }
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204
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205 void SDL_SYS_SetupThread(void)
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206 {
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207 int i;
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208 sigset_t mask;
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209
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210 /* Mask asynchronous signals for this thread */
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211 sigemptyset(&mask);
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212 for ( i=0; sig_list[i]; ++i ) {
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213 sigaddset(&mask, sig_list[i]);
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214 }
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215 sigprocmask(SIG_BLOCK, &mask, 0);
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216 }
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217
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218 /* WARNING: This may not work for systems with 64-bit pid_t */
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219 Uint32 SDL_ThreadID(void)
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220 {
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221 return((Uint32)getpid());
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222 }
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223
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224 void SDL_SYS_WaitThread(SDL_Thread *thread)
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225 {
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226 #ifdef __WCLONE
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227 errno = 0;
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228 while ( errno != ECHILD ) {
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229 waitpid(thread->handle, 0, __WCLONE);
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230 }
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231 #else
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232 /* Ack, ugly ugly hack --
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233 wait() doesn't work, waitpid() doesn't work, and ignoring SIG_CHLD
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234 doesn't work .. and the child thread is still a zombie, so kill()
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235 doesn't work.
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236 */
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237 char command[1024];
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238
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239 sprintf(command,
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240 "ps ax|fgrep -v fgrep|fgrep -v '<zombie>'|fgrep %d >/dev/null",
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241 thread->handle);
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242 while ( system(command) == 0 )
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243 sleep(1);
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244 #endif
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245 free(thread->data);
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246 }
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247
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248 void SDL_SYS_KillThread(SDL_Thread *thread)
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249 {
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250 kill(thread->handle, SIGKILL);
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251 }
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252
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253 #endif /* SDL_USE_PTHREADS */
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254
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255 #endif /* FORK_HACK */
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