src/thread/symbian/SDL_sysmutex.cpp

   1 /*
   2    SDL - Simple DirectMedia Layer
   3    Copyright (C) 1997, 1998, 1999, 2000  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@devolution.com
  21    */
  22
  23 /*
  24    SDL_sysmutex.cpp
  25
  26    Epoc version by Markus Mertama (w@iki.fi)
  27    */
  28
  29 /* Mutex functions using the Win32 API */
  30
  31 //#include <stdio.h>
  32 //#include <stdlib.h>
  33
  34 #include <e32std.h>
  35
  36 #include "epoc_sdl.h"
  37
  38 #include "SDL_error.h"
  39 #include "SDL_mutex.h"
  40
  41 struct SDL_mutex
  42 {
  43         TInt handle;
  44 };
  45
  46 extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
  47
  48 TInt NewMutex(const TDesC& aName, TAny* aPtr1, TAny*)
  49 {
  50         return ((RMutex*)aPtr1)->CreateGlobal(aName);
  51 }
  52
  53 void DeleteMutex(TAny* aMutex)
  54 {
  55         SDL_DestroyMutex ((SDL_mutex*) aMutex);
  56 }
  57
  58 /* Create a mutex */
  59 SDL_mutex *SDL_CreateMutex(void)
  60 {
  61         RMutex rmutex;
  62
  63         TInt status = CreateUnique(NewMutex, &rmutex, NULL);
  64         if(status != KErrNone)
  65         {
  66                 SDL_SetError("Couldn't create mutex");
  67         }
  68         SDL_mutex* mutex = new SDL_mutex;
  69         mutex->handle = rmutex.Handle();
  70         EpocSdlEnv::AppendCleanupItem(TSdlCleanupItem(DeleteMutex, mutex));
  71         return(mutex);
  72 }
  73
  74 /* Free the mutex */
  75 void SDL_DestroyMutex(SDL_mutex *mutex)
  76 {
  77         if ( mutex )
  78         {
  79                 RMutex rmutex;
  80                 rmutex.SetHandle(mutex->handle);
  81                 if(rmutex.IsHeld())
  82                 {
  83                         rmutex.Signal();
  84                 }
  85                 rmutex.Close();
  86                 EpocSdlEnv::RemoveCleanupItem(mutex);
  87                 delete(mutex);
  88                 mutex = NULL;
  89         }
  90 }
  91
  92 /* Lock the mutex */
  93 int SDL_mutexP(SDL_mutex *mutex)
  94 {
  95         if ( mutex == NULL ) {
  96                 SDL_SetError("Passed a NULL mutex");
  97                 return -1;
  98         }
  99         RMutex rmutex;
 100         rmutex.SetHandle(mutex->handle);
 101         rmutex.Wait();
 102         return(0);
 103 }
 104
 105 /* Unlock the mutex */
 106 int SDL_mutexV(SDL_mutex *mutex)
 107 {
 108         if ( mutex == NULL ) {
 109                 SDL_SetError("Passed a NULL mutex");
 110                 return -1;
 111         }
 112         RMutex rmutex;
 113         rmutex.SetHandle(mutex->handle);
 114         rmutex.Signal();
 115         return(0);
 116 }