1/*
2    SDL - Simple DirectMedia Layer
3    Copyright (C) 1997-2006 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 */
32static 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. */
40int riscos_using_threads = 0;
41Uint32 riscos_main_thread = 0; /* Thread running events */
42#endif
43
44
45static void *RunThread(void *data)
46{
47	SDL_RunThread(data);
48	pthread_exit((void*)0);
49	return((void *)0);		/* Prevent compiler warning */
50}
51
52int 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
79void 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 */
100Uint32 SDL_ThreadID(void)
101{
102	return((Uint32)pthread_self());
103}
104
105void SDL_SYS_WaitThread(SDL_Thread *thread)
106{
107	pthread_join(thread->handle, 0);
108}
109
110void 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