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      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 (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 /*
     25  *	GNU pth mutexes
     26  *
     27  *	Patrice Mandin
     28  */
     29 
     30 #include <pth.h>
     31 
     32 #include "SDL_mutex.h"
     33 #include "SDL_sysmutex_c.h"
     34 
     35 /* Create a mutex */
     36 SDL_mutex *SDL_CreateMutex(void)
     37 {
     38 	SDL_mutex *mutex;
     39 
     40 	/* Allocate mutex memory */
     41 	mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));
     42 	if ( mutex ) {
     43 		/* Create the mutex, with initial value signaled */
     44 	    if (!pth_mutex_init(&(mutex->mutexpth_p))) {
     45 			SDL_SetError("Couldn't create mutex");
     46 			SDL_free(mutex);
     47 			mutex = NULL;
     48 		}
     49 	} else {
     50 		SDL_OutOfMemory();
     51 	}
     52 	return(mutex);
     53 }
     54 
     55 /* Free the mutex */
     56 void SDL_DestroyMutex(SDL_mutex *mutex)
     57 {
     58 	if ( mutex ) {
     59 		SDL_free(mutex);
     60 	}
     61 }
     62 
     63 /* Lock the mutex */
     64 int SDL_mutexP(SDL_mutex *mutex)
     65 {
     66 	if ( mutex == NULL ) {
     67 		SDL_SetError("Passed a NULL mutex");
     68 		return -1;
     69 	}
     70 
     71 	pth_mutex_acquire(&(mutex->mutexpth_p), FALSE, NULL);
     72 
     73 	return(0);
     74 }
     75 
     76 /* Unlock the mutex */
     77 int SDL_mutexV(SDL_mutex *mutex)
     78 {
     79 	if ( mutex == NULL ) {
     80 		SDL_SetError("Passed a NULL mutex");
     81 		return -1;
     82 	}
     83 
     84     pth_mutex_release(&(mutex->mutexpth_p));
     85 
     86 	return(0);
     87 }
     88