pygame / src / fastevents.c

bob f94b4aa 

































































































































































































/*
    NET2 is a threaded, event based, network IO library for SDL.
    Copyright (C) 2002 Bob Pendleton

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public License
    as published by the Free Software Foundation; either version 2.1
    of the License, or (at your option) any later version.
    
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.
    
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA

    If you do not wish to comply with the terms of the LGPL please
    contact the author as other terms are available for a fee.
    
    Bob Pendleton
    Bob@Pendleton.com
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL.h"
#include "SDL_thread.h"

#include "fastevents.h"

//----------------------------------------
//
// error handling code
//

static char* error = NULL;

static __inline__ void setError(char *err)
{
  error = err;
}

char *FE_GetError()
{
  return error;
}

//----------------------------------------
// 
// Threads, mutexs, thread utils, and 
// thread safe wrappers
//

static SDL_mutex *eventLock = NULL;
static SDL_cond *eventWait = NULL;
static SDL_TimerID eventTimer = 0;

//----------------------------------------
//
//
//

int FE_PushEvent(SDL_Event *ev)
{
  SDL_LockMutex(eventLock);
  while (-1 == SDL_PushEvent(ev))
  {
    SDL_CondWait(eventWait, eventLock);
  }
  SDL_UnlockMutex(eventLock);
  SDL_CondSignal(eventWait);

  return 1;
}

//----------------------------------------
//
// 
//

void FE_PumpEvents()
{
  SDL_LockMutex(eventLock);
  SDL_PumpEvents();
  SDL_UnlockMutex(eventLock);
}

//----------------------------------------
//
// 
//

int FE_PollEvent(SDL_Event *event)
{
  int val = 0;

  SDL_LockMutex(eventLock);
  val = SDL_PollEvent(event);
  SDL_UnlockMutex(eventLock);

  if (0 < val)
  {
    SDL_CondSignal(eventWait);
  }

  return val;
}

//----------------------------------------
//
// Replacement for SDL_WaitEvent();
//

int FE_WaitEvent(SDL_Event *event)
{
  int val = 0;

  SDL_LockMutex(eventLock);
  while (0 >= (val = SDL_PollEvent(event)))
  {
    SDL_CondWait(eventWait, eventLock);
  }
  SDL_UnlockMutex(eventLock);
  SDL_CondSignal(eventWait);

  return val;
}

//----------------------------------------
//
//
//

static Uint32 timerCallback(Uint32 interval, void *param)
{
  SDL_CondBroadcast(eventWait);

  return interval;
}

//----------------------------------------
//
//
//

int FE_Init()
{
  if (0 == (SDL_INIT_TIMER & SDL_WasInit(SDL_INIT_TIMER)))
  {
    SDL_InitSubSystem(SDL_INIT_TIMER);
  }
  
  eventLock = SDL_CreateMutex();
  if (NULL == eventLock)
  {
    setError("FE: can't create a mutex");
    return -1;
  }

  eventWait = SDL_CreateCond();
  if (NULL == eventWait)
  {
    setError("FE: can't create a condition variable");
    return -1;
  }

  eventTimer = SDL_AddTimer(10, timerCallback, NULL);
  if (NULL == eventTimer)
  {
    setError("FE: can't add a timer");
    return -1;
  }

  return 0;
}

//----------------------------------------
//
//
//

void FE_Quit()
{
  SDL_DestroyMutex(eventLock);
  eventLock = NULL;

  SDL_DestroyCond(eventWait);
  eventWait = NULL;

  SDL_RemoveTimer(eventTimer);
}
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