src/thread/riscos/SDL_systhread.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 17 Sep 2004 13:20:10 +0000
changeset 955 d74fbf56f2f6
child 1312 c9b51268668f
permissions -rw-r--r--
Date: Fri, 25 Jun 2004 13:29:15 +0100
From: "alan buckley"
Subject: Modification for RISC OS version of SDL

Ive attached a zip file with the changes to this email, it contains the
following:

The file sdldiff.txt is the output from cvs diff u. .
The directory thread/riscos contains all the new files to support threading.

Readme.riscos is a new readme file to add.
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2004 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@libsdl.org
    21 */
    22 
    23 /* RISC OS version based on pthreads linux source */
    24 
    25 #ifdef SAVE_RCSID
    26 static char rcsid =
    27  "@(#) $Id$";
    28 #endif
    29 
    30 #include "SDL_error.h"
    31 #include "SDL_thread.h"
    32 #include "SDL_systhread.h"
    33 
    34 #ifdef DISABLE_THREADS
    35 
    36 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
    37 {
    38 	SDL_SetError("Threads have not been compiled into this version of the library");
    39 	return(-1);
    40 }
    41 
    42 void SDL_SYS_SetupThread(void)
    43 {
    44 	return;
    45 }
    46 
    47 Uint32 SDL_ThreadID(void)
    48 {
    49 	return(0);
    50 }
    51 
    52 void SDL_SYS_WaitThread(SDL_Thread *thread)
    53 {
    54 	return;
    55 }
    56 
    57 void SDL_SYS_KillThread(SDL_Thread *thread)
    58 {
    59 	return;
    60 }
    61 
    62 #else
    63 
    64 #include <signal.h>
    65 
    66 /* List of signals to mask in the subthreads */
    67 static int sig_list[] = {
    68 	SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
    69 	SIGVTALRM, SIGPROF, 0
    70 };
    71 
    72 #include <pthread.h>
    73 
    74 int riscos_using_threads = 0;
    75 Uint32 riscos_main_thread = 0; /* Thread running events */
    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 
   101         if (riscos_using_threads == 0)
   102         {
   103            riscos_using_threads = 1;
   104            riscos_main_thread = SDL_ThreadID();
   105         }
   106       
   107 	return(0);
   108 }
   109 
   110 void SDL_SYS_SetupThread(void)
   111 {
   112 	int i;
   113 	sigset_t mask;
   114 
   115 	/* Mask asynchronous signals for this thread */
   116 	sigemptyset(&mask);
   117 	for ( i=0; sig_list[i]; ++i ) {
   118 		sigaddset(&mask, sig_list[i]);
   119 	}
   120 	pthread_sigmask(SIG_BLOCK, &mask, 0);
   121 	
   122 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS
   123 	/* Allow ourselves to be asynchronously cancelled */
   124 	{ int oldstate;
   125 		pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
   126 	}
   127 #endif
   128 }
   129 
   130 Uint32 SDL_ThreadID(void)
   131 {
   132 	return((Uint32)pthread_self());
   133 }
   134 
   135 void SDL_SYS_WaitThread(SDL_Thread *thread)
   136 {
   137 	pthread_join(thread->handle, 0);
   138 }
   139 
   140 void SDL_SYS_KillThread(SDL_Thread *thread)
   141 {
   142 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS
   143 	pthread_cancel(thread->handle);
   144 #else
   145 	pthread_kill(thread->handle, SIGKILL);
   146 #endif
   147 }
   148 
   149 #endif