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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 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 (at) devolution.com
     21 */
     22 
     23 /*
     24     SDL_sysmutex.cpp
     25 
     26     Epoc version by Markus Mertama (w (at) iki.fi)
     27 */
     28 
     29 
     30 #ifdef SAVE_RCSID
     31 static char rcsid =
     32  "@(#) $Id: SDL_sysmutex.c,v 1.1.2.3 2000/06/22 15:25:23 hercules Exp $";
     33 #endif
     34 
     35 /* Mutex functions using the Win32 API */
     36 
     37 //#include <stdio.h>
     38 //#include <stdlib.h>
     39 
     40 #include <e32std.h>
     41 
     42 #include "epoc_sdl.h"
     43 
     44 #include "SDL_error.h"
     45 #include "SDL_mutex.h"
     46 
     47 
     48 #ifdef EKA2 //???
     49 struct SDL_mutex
     50     {
     51     TInt handle;
     52     };
     53 #else
     54 struct _SDL_mutex
     55     {
     56     TInt handle;
     57     };
     58 #endif
     59 
     60 extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
     61 
     62 TInt NewMutex(const TDesC& aName, TAny* aPtr1, TAny*)
     63     {
     64     return ((RMutex*)aPtr1)->CreateGlobal(aName);
     65     }
     66 
     67 void DeleteMutex(TAny* aMutex)
     68     {
     69     SDL_DestroyMutex ((SDL_mutex*) aMutex);
     70     }
     71 
     72 /* Create a mutex */
     73 SDL_mutex *SDL_CreateMutex(void)
     74 {
     75     RMutex rmutex;
     76 
     77     TInt status = CreateUnique(NewMutex, &rmutex, NULL);
     78 	if(status != KErrNone)
     79 	    {
     80 			SDL_SetError("Couldn't create mutex");
     81 		}
     82     SDL_mutex* mutex = new /*(ELeave)*/ SDL_mutex;
     83     mutex->handle = rmutex.Handle();
     84     EpocSdlEnv::AppendCleanupItem(TSdlCleanupItem(DeleteMutex, mutex));
     85 	return(mutex);
     86 }
     87 
     88 /* Free the mutex */
     89 void SDL_DestroyMutex(SDL_mutex *mutex)
     90 {
     91 	if ( mutex )
     92 	{
     93     RMutex rmutex;
     94     rmutex.SetHandle(mutex->handle);
     95     if(rmutex.IsHeld())
     96         {
     97 	    rmutex.Signal();
     98         }
     99 	rmutex.Close();
    100 	EpocSdlEnv::RemoveCleanupItem(mutex);
    101 	delete(mutex);
    102     mutex = NULL;
    103 	}
    104 }
    105 
    106 /* Lock the mutex */
    107 int SDL_mutexP(SDL_mutex *mutex)
    108 {
    109 	if ( mutex == NULL ) {
    110 		SDL_SetError("Passed a NULL mutex");
    111 		return -1;
    112 	}
    113     RMutex rmutex;
    114     rmutex.SetHandle(mutex->handle);
    115 	rmutex.Wait();
    116 	return(0);
    117 }
    118 
    119 /* Unlock the mutex */
    120 int SDL_mutexV(SDL_mutex *mutex)
    121 {
    122 	if ( mutex == NULL ) {
    123 		SDL_SetError("Passed a NULL mutex");
    124 		return -1;
    125 	}
    126 	RMutex rmutex;
    127     rmutex.SetHandle(mutex->handle);
    128 	rmutex.Signal();
    129 	return(0);
    130 }
    131