1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2012 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #include <pthread.h>
25 #include <signal.h>
26
27 #include "SDL_thread.h"
28 #include "../SDL_thread_c.h"
29 #include "../SDL_systhread.h"
30
31 /* List of signals to mask in the subthreads */
32 static int sig_list[] = {
33 SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
34 SIGVTALRM, SIGPROF, 0
35 };
36
37 #ifdef __RISCOS__
38 /* RISC OS needs to know the main thread for
39 * it's timer and event processing. */
40 int riscos_using_threads = 0;
41 Uint32 riscos_main_thread = 0; /* Thread running events */
42 #endif
43
44
RunThread(void * data)45 static void *RunThread(void *data)
46 {
47 SDL_RunThread(data);
48 pthread_exit((void*)0);
49 return((void *)0); /* Prevent compiler warning */
50 }
51
SDL_SYS_CreateThread(SDL_Thread * thread,void * args)52 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
53 {
54 pthread_attr_t type;
55
56 /* Set the thread attributes */
57 if ( pthread_attr_init(&type) != 0 ) {
58 SDL_SetError("Couldn't initialize pthread attributes");
59 return(-1);
60 }
61 pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);
62
63 /* Create the thread and go! */
64 if ( pthread_create(&thread->handle, &type, RunThread, args) != 0 ) {
65 SDL_SetError("Not enough resources to create thread");
66 return(-1);
67 }
68
69 #ifdef __RISCOS__
70 if (riscos_using_threads == 0) {
71 riscos_using_threads = 1;
72 riscos_main_thread = SDL_ThreadID();
73 }
74 #endif
75
76 return(0);
77 }
78
SDL_SYS_SetupThread(void)79 void SDL_SYS_SetupThread(void)
80 {
81 int i;
82 sigset_t mask;
83
84 /* Mask asynchronous signals for this thread */
85 sigemptyset(&mask);
86 for ( i=0; sig_list[i]; ++i ) {
87 sigaddset(&mask, sig_list[i]);
88 }
89 pthread_sigmask(SIG_BLOCK, &mask, 0);
90
91 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS
92 /* Allow ourselves to be asynchronously cancelled */
93 { int oldstate;
94 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
95 }
96 #endif
97 }
98
99 /* WARNING: This may not work for systems with 64-bit pid_t */
SDL_ThreadID(void)100 Uint32 SDL_ThreadID(void)
101 {
102 return((Uint32)((size_t)pthread_self()));
103 }
104
SDL_SYS_WaitThread(SDL_Thread * thread)105 void SDL_SYS_WaitThread(SDL_Thread *thread)
106 {
107 pthread_join(thread->handle, 0);
108 }
109
SDL_SYS_KillThread(SDL_Thread * thread)110 void SDL_SYS_KillThread(SDL_Thread *thread)
111 {
112 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS
113 pthread_cancel(thread->handle);
114 #else
115 #ifdef __FREEBSD__
116 #warning For some reason, this doesnt actually kill a thread - FreeBSD 3.2
117 #endif
118 pthread_kill(thread->handle, SIGKILL);
119 #endif
120 }
121