src/thread/SDL_thread.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 10 Feb 2006 06:48:43 +0000
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permissions -rw-r--r--
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* System independent thread management routines for SDL */
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#include "SDL_mutex.h"
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#include "SDL_thread.h"
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#include "SDL_thread_c.h"
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#include "SDL_systhread.h"
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#define ARRAY_CHUNKSIZE	32
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/* The array of threads currently active in the application
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   (except the main thread)
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   The manipulation of an array here is safer than using a linked list.
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*/
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static int SDL_maxthreads = 0;
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static int SDL_numthreads = 0;
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static SDL_Thread **SDL_Threads = NULL;
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static SDL_mutex *thread_lock = NULL;
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int _creating_thread_lock = 0;
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int SDL_ThreadsInit(void)
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{
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	int retval;
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	retval = 0;
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	/* Set the thread lock creation flag so that we can reuse an
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	   existing lock on the system - since this mutex never gets
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	   destroyed (see SDL_ThreadsQuit()), we want to reuse it.
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	*/
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	_creating_thread_lock = 1;
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	thread_lock = SDL_CreateMutex();
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	_creating_thread_lock = 0;
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	if ( thread_lock == NULL ) {
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		retval = -1;
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	}
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	return(retval);
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}
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/* This should never be called...
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   If this is called by SDL_Quit(), we don't know whether or not we should
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   clean up threads here.  If any threads are still running after this call,
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   they will no longer have access to any per-thread data.
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 */
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void SDL_ThreadsQuit()
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{
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	SDL_mutex *mutex;
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	mutex = thread_lock;
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	thread_lock = NULL;
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	if ( mutex != NULL ) {
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		SDL_DestroyMutex(mutex);
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	}
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}
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/* Routines for manipulating the thread list */
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static void SDL_AddThread(SDL_Thread *thread)
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{
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	SDL_Thread **threads;
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	/* WARNING:
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	   If the very first threads are created simultaneously, then
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	   there could be a race condition causing memory corruption.
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	   In practice, this isn't a problem because by definition there
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	   is only one thread running the first time this is called.
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	*/
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	if ( thread_lock == NULL ) {
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		if ( SDL_ThreadsInit() < 0 ) {
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			return;
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		}
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	}
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	SDL_mutexP(thread_lock);
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	/* Expand the list of threads, if necessary */
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#ifdef DEBUG_THREADS
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	printf("Adding thread (%d already - %d max)\n",
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			SDL_numthreads, SDL_maxthreads);
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#endif
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	if ( SDL_numthreads == SDL_maxthreads ) {
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		threads=(SDL_Thread **)SDL_malloc((SDL_maxthreads+ARRAY_CHUNKSIZE)*
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		                              (sizeof *threads));
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		if ( threads == NULL ) {
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			SDL_OutOfMemory();
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			goto done;
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		}
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		SDL_memcpy(threads, SDL_Threads, SDL_numthreads*(sizeof *threads));
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		SDL_maxthreads += ARRAY_CHUNKSIZE;
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		if ( SDL_Threads ) {
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			SDL_free(SDL_Threads);
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		}
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		SDL_Threads = threads;
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	}
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	SDL_Threads[SDL_numthreads++] = thread;
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done:
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	SDL_mutexV(thread_lock);
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}
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static void SDL_DelThread(SDL_Thread *thread)
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{
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	int i;
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	if ( thread_lock ) {
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		SDL_mutexP(thread_lock);
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		for ( i=0; i<SDL_numthreads; ++i ) {
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			if ( thread == SDL_Threads[i] ) {
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				break;
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			}
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		}
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		if ( i < SDL_numthreads ) {
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			if ( --SDL_numthreads > 0 ) {
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				while ( i < SDL_numthreads ) {
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					SDL_Threads[i] = SDL_Threads[i+1];
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					++i;
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				}
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			} else {
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				SDL_maxthreads = 0;
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				SDL_free(SDL_Threads);
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				SDL_Threads = NULL;
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			}
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#ifdef DEBUG_THREADS
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			printf("Deleting thread (%d left - %d max)\n",
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					SDL_numthreads, SDL_maxthreads);
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#endif
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		}
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		SDL_mutexV(thread_lock);
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	}
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}
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/* The default (non-thread-safe) global error variable */
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static SDL_error SDL_global_error;
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/* Routine to get the thread-specific error variable */
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SDL_error *SDL_GetErrBuf(void)
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{
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	SDL_error *errbuf;
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	errbuf = &SDL_global_error;
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	if ( SDL_Threads ) {
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		int i;
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		Uint32 this_thread;
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		this_thread = SDL_ThreadID();
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		SDL_mutexP(thread_lock);
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		for ( i=0; i<SDL_numthreads; ++i ) {
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			if ( this_thread == SDL_Threads[i]->threadid ) {
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				errbuf = &SDL_Threads[i]->errbuf;
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				break;
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			}
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		}
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		SDL_mutexV(thread_lock);
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	}
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	return(errbuf);
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}
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/* Arguments and callback to setup and run the user thread function */
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typedef struct {
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	int (*func)(void *);
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	void *data;
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	SDL_Thread *info;
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	SDL_sem *wait;
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} thread_args;
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void SDL_RunThread(void *data)
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{
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	thread_args *args;
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	int (*userfunc)(void *);
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	void *userdata;
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	int *statusloc;
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	/* Perform any system-dependent setup
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	   - this function cannot fail, and cannot use SDL_SetError()
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	 */
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	SDL_SYS_SetupThread();
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	/* Get the thread id */
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	args = (thread_args *)data;
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	args->info->threadid = SDL_ThreadID();
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	/* Figure out what function to run */
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	userfunc = args->func;
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	userdata = args->data;
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	statusloc = &args->info->status;
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	/* Wake up the parent thread */
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	SDL_SemPost(args->wait);
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	/* Run the function */
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	*statusloc = userfunc(userdata);
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}
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#if defined(_WIN32) || defined(__OS2__)
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#undef SDL_CreateThread
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DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread)
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#else
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DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data)
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#endif
0
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{
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	SDL_Thread *thread;
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	thread_args *args;
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	int ret;
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	/* Allocate memory for the thread info structure */
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	thread = (SDL_Thread *)SDL_malloc(sizeof(*thread));
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	if ( thread == NULL ) {
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		SDL_OutOfMemory();
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		return(NULL);
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	}
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	SDL_memset(thread, 0, (sizeof *thread));
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	thread->status = -1;
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	/* Set up the arguments for the thread */
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	args = (thread_args *)SDL_malloc(sizeof(*args));
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	if ( args == NULL ) {
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		SDL_OutOfMemory();
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		SDL_free(thread);
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		return(NULL);
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	}
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	args->func = fn;
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	args->data = data;
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	args->info = thread;
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	args->wait = SDL_CreateSemaphore(0);
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	if ( args->wait == NULL ) {
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		SDL_free(thread);
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		SDL_free(args);
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		return(NULL);
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	}
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	/* Add the thread to the list of available threads */
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	SDL_AddThread(thread);
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	/* Create the thread and go! */
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#if defined(_WIN32) || defined(__OS2__)
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	ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread);
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#else
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	ret = SDL_SYS_CreateThread(thread, args);
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#endif
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	if ( ret >= 0 ) {
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		/* Wait for the thread function to use arguments */
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		SDL_SemWait(args->wait);
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	} else {
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		/* Oops, failed.  Gotta free everything */
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		SDL_DelThread(thread);
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		SDL_free(thread);
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		thread = NULL;
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	}
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	SDL_DestroySemaphore(args->wait);
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	SDL_free(args);
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	/* Everything is running now */
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	return(thread);
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}
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void SDL_WaitThread(SDL_Thread *thread, int *status)
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{
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	if ( thread ) {
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		SDL_SYS_WaitThread(thread);
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		if ( status ) {
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			*status = thread->status;
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		}
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		SDL_DelThread(thread);
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		SDL_free(thread);
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	}
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}
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Uint32 SDL_GetThreadID(SDL_Thread *thread)
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{
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	Uint32 id;
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	if ( thread ) {
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		id = thread->threadid;
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	} else {
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		id = SDL_ThreadID();
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	}
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	return(id);
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}
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void SDL_KillThread(SDL_Thread *thread)
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{
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	if ( thread ) {
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		SDL_SYS_KillThread(thread);
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		SDL_WaitThread(thread, NULL);
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	}
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}
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