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comparison src/thread/linux/SDL_systhread.c @ 0:74212992fb08

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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
parents
children e8157fcb3114
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-1:000000000000 0:74212992fb08
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
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
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id$";
26 #endif
27
28 /* Linux thread management routines for SDL */
29
30 #include "SDL_error.h"
31 #include "SDL_thread.h"
32 #include "SDL_systhread.h"
33
34 #ifdef FORK_HACK
35
36 #include <unistd.h>
37
38 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
39 {
40 SDL_SetError("Threads are not supported on this platform");
41 return(-1);
42 }
43 void SDL_SYS_SetupThread(void)
44 {
45 return;
46 }
47 Uint32 SDL_ThreadID(void)
48 {
49 return((Uint32)getpid());
50 }
51 void SDL_SYS_WaitThread(SDL_Thread *thread)
52 {
53 return;
54 }
55 void SDL_SYS_KillThread(SDL_Thread *thread)
56 {
57 return;
58 }
59
60 #else
61
62 #include <signal.h>
63
64 #if !defined(MACOSX) /* pthread_sigmask seems to be missing on MacOS X? */
65 /* List of signals to mask in the subthreads */
66 static int sig_list[] = {
67 SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
68 SIGVTALRM, SIGPROF, 0
69 };
70 #endif /* !MACOSX */
71
72 #ifdef SDL_USE_PTHREADS
73
74 #include <pthread.h>
75
76
77 static void *RunThread(void *data)
78 {
79 SDL_RunThread(data);
80 pthread_exit((void*)0);
81 return((void *)0); /* Prevent compiler warning */
82 }
83
84 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
85 {
86 pthread_attr_t type;
87
88 /* Set the thread attributes */
89 if ( pthread_attr_init(&type) != 0 ) {
90 SDL_SetError("Couldn't initialize pthread attributes");
91 return(-1);
92 }
93 pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);
94
95 /* Create the thread and go! */
96 if ( pthread_create(&thread->handle, &type, RunThread, args) != 0 ) {
97 SDL_SetError("Not enough resources to create thread");
98 return(-1);
99 }
100 return(0);
101 }
102
103 void SDL_SYS_SetupThread(void)
104 {
105 #if !defined(MACOSX) /* pthread_sigmask seems to be missing on MacOS X? */
106 int i;
107 sigset_t mask;
108
109 /* Mask asynchronous signals for this thread */
110 sigemptyset(&mask);
111 for ( i=0; sig_list[i]; ++i ) {
112 sigaddset(&mask, sig_list[i]);
113 }
114 pthread_sigmask(SIG_BLOCK, &mask, 0);
115 #endif /* !MACOSX */
116
117 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS
118 /* Allow ourselves to be asynchronously cancelled */
119 { int oldstate;
120 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
121 }
122 #endif
123 }
124
125 /* WARNING: This may not work for systems with 64-bit pid_t */
126 Uint32 SDL_ThreadID(void)
127 {
128 return((Uint32)pthread_self());
129 }
130
131 void SDL_SYS_WaitThread(SDL_Thread *thread)
132 {
133 pthread_join(thread->handle, 0);
134 }
135
136 void SDL_SYS_KillThread(SDL_Thread *thread)
137 {
138 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS
139 pthread_cancel(thread->handle);
140 #else
141 #ifdef __FreeBSD__
142 #warning For some reason, this doesnt actually kill a thread - FreeBSD 3.2
143 #endif
144 pthread_kill(thread->handle, SIGKILL);
145 #endif
146 }
147
148 #else /* Linux-specific clone() based implementation */
149
150 #include <stdlib.h>
151 #include <errno.h>
152 #include <unistd.h>
153 #include <sys/wait.h>
154
155
156 /* Stack size for child thread */
157 #define STACKSIZE 16384*4 /* 16384 is too small */
158
159 #ifdef __GLIBC__
160 #include <sched.h>
161 #else
162 /* From <linux/sched.h> */
163 #define CLONE_VM 0x00000100 /* set if VM shared */
164 #define CLONE_FS 0x00000200 /* set if fs info shared */
165 #define CLONE_FILES 0x00000400 /* set if open files shared */
166 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers shared */
167 #define CLONE_PID 0x00001000 /* set if pid shared */
168
169 /* The infamous "start_thread" function, courtesy Linus Torvalds */
170 extern int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg);
171 #endif
172
173 static int RunThread(void *data)
174 {
175 SDL_RunThread(data);
176 return(0);
177 }
178
179 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
180 {
181 void *stack;
182
183 /* Allocate memory for thread stack */
184 stack = malloc(STACKSIZE);
185 if ( stack == (void *)0 ) {
186 SDL_OutOfMemory();
187 return(-1);
188 }
189 thread->data = stack;
190
191 /* Adjust the stack since it actually grows down */
192 stack = (void *) ((char *)stack + STACKSIZE);
193
194 /* Create the thread and go! */
195 thread->handle = clone(RunThread, stack,
196 (CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND), args);
197 if ( thread->handle < 0 ) {
198 free(thread->data);
199 SDL_SetError("Not enough resources to create thread");
200 return(-1);
201 }
202 return(0);
203 }
204
205 void SDL_SYS_SetupThread(void)
206 {
207 int i;
208 sigset_t mask;
209
210 /* Mask asynchronous signals for this thread */
211 sigemptyset(&mask);
212 for ( i=0; sig_list[i]; ++i ) {
213 sigaddset(&mask, sig_list[i]);
214 }
215 sigprocmask(SIG_BLOCK, &mask, 0);
216 }
217
218 /* WARNING: This may not work for systems with 64-bit pid_t */
219 Uint32 SDL_ThreadID(void)
220 {
221 return((Uint32)getpid());
222 }
223
224 void SDL_SYS_WaitThread(SDL_Thread *thread)
225 {
226 #ifdef __WCLONE
227 errno = 0;
228 while ( errno != ECHILD ) {
229 waitpid(thread->handle, 0, __WCLONE);
230 }
231 #else
232 /* Ack, ugly ugly hack --
233 wait() doesn't work, waitpid() doesn't work, and ignoring SIG_CHLD
234 doesn't work .. and the child thread is still a zombie, so kill()
235 doesn't work.
236 */
237 char command[1024];
238
239 sprintf(command,
240 "ps ax|fgrep -v fgrep|fgrep -v '<zombie>'|fgrep %d >/dev/null",
241 thread->handle);
242 while ( system(command) == 0 )
243 sleep(1);
244 #endif
245 free(thread->data);
246 }
247
248 void SDL_SYS_KillThread(SDL_Thread *thread)
249 {
250 kill(thread->handle, SIGKILL);
251 }
252
253 #endif /* SDL_USE_PTHREADS */
254
255 #endif /* FORK_HACK */