Mercurial > sdl-ios-xcode
annotate src/thread/linux/SDL_systhread.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | fd068ab116ee |
| children | 3692456e7b0f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1300
diff
changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1300
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1300
diff
changeset
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1300
diff
changeset
|
13 Lesser General Public License for more details. |
| 0 | 14 |
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1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1300
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1300
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1300
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* Linux thread management routines for SDL */ | |
| 24 | |
| 25 #include "SDL_error.h" | |
| 26 #include "SDL_thread.h" | |
| 27 #include "SDL_systhread.h" | |
| 28 | |
| 29 #ifdef FORK_HACK | |
| 30 | |
| 31 #include <unistd.h> | |
| 32 | |
| 33 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args) | |
| 34 { | |
| 35 SDL_SetError("Threads are not supported on this platform"); | |
| 36 return(-1); | |
| 37 } | |
| 38 void SDL_SYS_SetupThread(void) | |
| 39 { | |
| 40 return; | |
| 41 } | |
| 42 Uint32 SDL_ThreadID(void) | |
| 43 { | |
| 44 return((Uint32)getpid()); | |
| 45 } | |
| 46 void SDL_SYS_WaitThread(SDL_Thread *thread) | |
| 47 { | |
| 48 return; | |
| 49 } | |
| 50 void SDL_SYS_KillThread(SDL_Thread *thread) | |
| 51 { | |
| 52 return; | |
| 53 } | |
| 54 | |
| 55 #else | |
| 56 | |
| 57 #include <signal.h> | |
| 58 | |
| 59 /* List of signals to mask in the subthreads */ | |
| 60 static int sig_list[] = { | |
| 61 SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH, | |
| 62 SIGVTALRM, SIGPROF, 0 | |
| 63 }; | |
| 64 | |
| 65 #ifdef SDL_USE_PTHREADS | |
| 66 | |
| 67 #include <pthread.h> | |
| 68 | |
| 69 | |
| 70 static void *RunThread(void *data) | |
| 71 { | |
| 72 SDL_RunThread(data); | |
| 73 pthread_exit((void*)0); | |
| 74 return((void *)0); /* Prevent compiler warning */ | |
| 75 } | |
| 76 | |
| 77 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args) | |
| 78 { | |
| 79 pthread_attr_t type; | |
| 80 | |
| 81 /* Set the thread attributes */ | |
| 82 if ( pthread_attr_init(&type) != 0 ) { | |
| 83 SDL_SetError("Couldn't initialize pthread attributes"); | |
| 84 return(-1); | |
| 85 } | |
| 86 pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE); | |
| 87 | |
| 88 /* Create the thread and go! */ | |
| 89 if ( pthread_create(&thread->handle, &type, RunThread, args) != 0 ) { | |
| 90 SDL_SetError("Not enough resources to create thread"); | |
| 91 return(-1); | |
| 92 } | |
| 93 return(0); | |
| 94 } | |
| 95 | |
| 96 void SDL_SYS_SetupThread(void) | |
| 97 { | |
| 98 int i; | |
| 99 sigset_t mask; | |
| 100 | |
| 101 /* Mask asynchronous signals for this thread */ | |
| 102 sigemptyset(&mask); | |
| 103 for ( i=0; sig_list[i]; ++i ) { | |
| 104 sigaddset(&mask, sig_list[i]); | |
| 105 } | |
| 106 pthread_sigmask(SIG_BLOCK, &mask, 0); | |
| 107 | |
| 108 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS | |
| 109 /* Allow ourselves to be asynchronously cancelled */ | |
| 110 { int oldstate; | |
| 111 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate); | |
| 112 } | |
| 113 #endif | |
| 114 } | |
| 115 | |
| 116 /* WARNING: This may not work for systems with 64-bit pid_t */ | |
| 117 Uint32 SDL_ThreadID(void) | |
| 118 { | |
| 119 return((Uint32)pthread_self()); | |
| 120 } | |
| 121 | |
| 122 void SDL_SYS_WaitThread(SDL_Thread *thread) | |
| 123 { | |
| 124 pthread_join(thread->handle, 0); | |
| 125 } | |
| 126 | |
| 127 void SDL_SYS_KillThread(SDL_Thread *thread) | |
| 128 { | |
| 129 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS | |
| 130 pthread_cancel(thread->handle); | |
| 131 #else | |
| 132 #ifdef __FreeBSD__ | |
| 133 #warning For some reason, this doesnt actually kill a thread - FreeBSD 3.2 | |
| 134 #endif | |
| 135 pthread_kill(thread->handle, SIGKILL); | |
| 136 #endif | |
| 137 } | |
| 138 | |
| 139 #else /* Linux-specific clone() based implementation */ | |
| 140 | |
| 141 #include <stdlib.h> | |
| 142 #include <errno.h> | |
| 143 #include <unistd.h> | |
| 144 #include <sys/wait.h> | |
| 145 | |
| 146 | |
| 147 /* Stack size for child thread */ | |
| 148 #define STACKSIZE 16384*4 /* 16384 is too small */ | |
| 149 | |
| 150 #ifdef __GLIBC__ | |
| 151 #include <sched.h> | |
| 152 #else | |
| 153 /* From <linux/sched.h> */ | |
| 154 #define CLONE_VM 0x00000100 /* set if VM shared */ | |
| 155 #define CLONE_FS 0x00000200 /* set if fs info shared */ | |
| 156 #define CLONE_FILES 0x00000400 /* set if open files shared */ | |
| 157 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers shared */ | |
| 158 #define CLONE_PID 0x00001000 /* set if pid shared */ | |
| 159 | |
| 160 /* The infamous "start_thread" function, courtesy Linus Torvalds */ | |
| 161 extern int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); | |
| 162 #endif | |
| 163 | |
| 164 static int RunThread(void *data) | |
| 165 { | |
| 166 SDL_RunThread(data); | |
| 167 return(0); | |
| 168 } | |
| 169 | |
| 170 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args) | |
| 171 { | |
| 172 void *stack; | |
| 173 | |
| 174 /* Allocate memory for thread stack */ | |
| 175 stack = malloc(STACKSIZE); | |
| 176 if ( stack == (void *)0 ) { | |
| 177 SDL_OutOfMemory(); | |
| 178 return(-1); | |
| 179 } | |
| 180 thread->data = stack; | |
| 181 | |
| 182 /* Adjust the stack since it actually grows down */ | |
| 183 stack = (void *) ((char *)stack + STACKSIZE); | |
| 184 | |
| 185 /* Create the thread and go! */ | |
| 186 thread->handle = clone(RunThread, stack, | |
| 187 (CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND), args); | |
| 188 if ( thread->handle < 0 ) { | |
| 189 free(thread->data); | |
| 190 SDL_SetError("Not enough resources to create thread"); | |
| 191 return(-1); | |
| 192 } | |
| 193 return(0); | |
| 194 } | |
| 195 | |
| 196 void SDL_SYS_SetupThread(void) | |
| 197 { | |
| 198 int i; | |
| 199 sigset_t mask; | |
| 200 | |
| 201 /* Mask asynchronous signals for this thread */ | |
| 202 sigemptyset(&mask); | |
| 203 for ( i=0; sig_list[i]; ++i ) { | |
| 204 sigaddset(&mask, sig_list[i]); | |
| 205 } | |
| 206 sigprocmask(SIG_BLOCK, &mask, 0); | |
| 207 } | |
| 208 | |
| 209 /* WARNING: This may not work for systems with 64-bit pid_t */ | |
| 210 Uint32 SDL_ThreadID(void) | |
| 211 { | |
| 212 return((Uint32)getpid()); | |
| 213 } | |
| 214 | |
| 215 void SDL_SYS_WaitThread(SDL_Thread *thread) | |
| 216 { | |
| 217 #ifdef __WCLONE | |
| 218 errno = 0; | |
| 219 while ( errno != ECHILD ) { | |
| 220 waitpid(thread->handle, 0, __WCLONE); | |
| 221 } | |
| 222 #else | |
| 223 /* Ack, ugly ugly hack -- | |
| 224 wait() doesn't work, waitpid() doesn't work, and ignoring SIG_CHLD | |
| 225 doesn't work .. and the child thread is still a zombie, so kill() | |
| 226 doesn't work. | |
| 227 */ | |
| 228 char command[1024]; | |
| 229 | |
| 230 sprintf(command, | |
| 231 "ps ax|fgrep -v fgrep|fgrep -v '<zombie>'|fgrep %d >/dev/null", | |
| 232 thread->handle); | |
| 233 while ( system(command) == 0 ) | |
| 234 sleep(1); | |
| 235 #endif | |
| 236 free(thread->data); | |
| 237 } | |
| 238 | |
| 239 void SDL_SYS_KillThread(SDL_Thread *thread) | |
| 240 { | |
| 241 kill(thread->handle, SIGKILL); | |
| 242 } | |
| 243 | |
| 244 #endif /* SDL_USE_PTHREADS */ | |
| 245 | |
| 246 #endif /* FORK_HACK */ |