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      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 (at) 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 
     31 int 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 
     37 void SDL_SYS_SetupThread(void)
     38 {
     39 	return;
     40 }
     41 
     42 Uint32 SDL_ThreadID(void)
     43 {
     44 	return(0);
     45 }
     46 
     47 void SDL_SYS_WaitThread(SDL_Thread *thread)
     48 {
     49 	return;
     50 }
     51 
     52 void 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 */
     62 static int sig_list[] = {
     63 	SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
     64 	SIGVTALRM, SIGPROF, 0
     65 };
     66 
     67 #include <pthread.h>
     68 
     69 int riscos_using_threads = 0;
     70 Uint32 riscos_main_thread = 0; /* Thread running events */
     71 
     72 static void *RunThread(void *data)
     73 {
     74 	SDL_RunThread(data);
     75 	pthread_exit((void*)0);
     76 	return((void *)0);		/* Prevent compiler warning */
     77 }
     78 
     79 int 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 
    105 void 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 
    125 Uint32 SDL_ThreadID(void)
    126 {
    127 	return((Uint32)pthread_self());
    128 }
    129 
    130 void SDL_SYS_WaitThread(SDL_Thread *thread)
    131 {
    132 	pthread_join(thread->handle, 0);
    133 }
    134 
    135 void 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