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/* RISC OS version based on pthreads linux source */
25
26#include "SDL_thread.h"
27#include "../SDL_systhread.h"
28
29#if SDL_THREADS_DISABLED
30
31int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
32{
33	SDL_SetError("Threads have not been compiled into this version of the library");
34	return(-1);
35}
36
37void SDL_SYS_SetupThread(void)
38{
39	return;
40}
41
42Uint32 SDL_ThreadID(void)
43{
44	return(0);
45}
46
47void SDL_SYS_WaitThread(SDL_Thread *thread)
48{
49	return;
50}
51
52void SDL_SYS_KillThread(SDL_Thread *thread)
53{
54	return;
55}
56
57#else
58
59#include <signal.h>
60
61/* List of signals to mask in the subthreads */
62static int sig_list[] = {
63	SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
64	SIGVTALRM, SIGPROF, 0
65};
66
67#include <pthread.h>
68
69int riscos_using_threads = 0;
70Uint32 riscos_main_thread = 0; /* Thread running events */
71
72static void *RunThread(void *data)
73{
74	SDL_RunThread(data);
75	pthread_exit((void*)0);
76	return((void *)0);		/* Prevent compiler warning */
77}
78
79int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
80{
81	pthread_attr_t type;
82
83	/* Set the thread attributes */
84	if ( pthread_attr_init(&type) != 0 ) {
85		SDL_SetError("Couldn't initialize pthread attributes");
86		return(-1);
87	}
88	pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);
89
90	/* Create the thread and go! */
91	if ( pthread_create(&thread->handle, &type, RunThread, args) != 0 ) {
92		SDL_SetError("Not enough resources to create thread");
93		return(-1);
94	}
95
96        if (riscos_using_threads == 0)
97        {
98           riscos_using_threads = 1;
99           riscos_main_thread = SDL_ThreadID();
100        }
101
102	return(0);
103}
104
105void SDL_SYS_SetupThread(void)
106{
107	int i;
108	sigset_t mask;
109
110	/* Mask asynchronous signals for this thread */
111	sigemptyset(&mask);
112	for ( i=0; sig_list[i]; ++i ) {
113		sigaddset(&mask, sig_list[i]);
114	}
115	pthread_sigmask(SIG_BLOCK, &mask, 0);
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
125Uint32 SDL_ThreadID(void)
126{
127	return((Uint32)pthread_self());
128}
129
130void SDL_SYS_WaitThread(SDL_Thread *thread)
131{
132	pthread_join(thread->handle, 0);
133}
134
135void SDL_SYS_KillThread(SDL_Thread *thread)
136{
137#ifdef PTHREAD_CANCEL_ASYNCHRONOUS
138	pthread_cancel(thread->handle);
139#else
140	pthread_kill(thread->handle, SIGKILL);
141#endif
142}
143
144#endif
145