/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/* OS/2 thread management routines for SDL */

#include <process.h>

#define INCL_DOSERRORS

#define INCL_DOSPROCESS

#include <os2.h>

#include "SDL_thread.h"

#include "../SDL_systhread.h"

#include "../SDL_thread_c.h"

typedef struct ThreadStartParms

{

  void *args;

  pfnSDL_CurrentEndThread pfnCurrentEndThread;

} tThreadStartParms, *pThreadStartParms;

static void threadfunc(void *pparm)

{

  pThreadStartParms pThreadParms = pparm;

  pfnSDL_CurrentEndThread pfnCurrentEndThread = NULL;

  // Call the thread function!

  SDL_RunThread(pThreadParms->args);

  // Get the current endthread we have to use!

  if (pThreadParms)

  {

    pfnCurrentEndThread = pThreadParms->pfnCurrentEndThread;

    SDL_free(pThreadParms);

  }

  // Call endthread!

  if (pfnCurrentEndThread)

    (*pfnCurrentEndThread)();

}

int SDL_SYS_CreateThread(SDL_Thread *thread, void *args, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread)

{

  pThreadStartParms pThreadParms = SDL_malloc(sizeof(tThreadStartParms));

  if (!pThreadParms)

  {

    SDL_SetError("Not enough memory to create thread");

    return(-1);

  }

  // Save the function which we will have to call to clear the RTL of calling app!

  pThreadParms->pfnCurrentEndThread = pfnEndThread;

  // Also save the real parameters we have to pass to thread function

  pThreadParms->args = args;

  // Start the thread using the runtime library of calling app!

  thread->threadid = thread->handle = (*pfnBeginThread)(threadfunc, NULL, 512*1024, pThreadParms);

  if ((int)thread->threadid <= 0)

  {

    SDL_SetError("Not enough resources to create thread");

    return(-1);

  }

  return(0);

}

void SDL_SYS_SetupThread(void)

{

  return;

}

DECLSPEC Uint32 SDLCALL SDL_ThreadID(void)

{

  PTIB tib;

  DosGetInfoBlocks(&tib, NULL);

  return((Uint32) (tib->tib_ptib2->tib2_ultid));

}

void SDL_SYS_WaitThread(SDL_Thread *thread)

{

  TID tid = thread->handle;

  DosWaitThread(&tid, DCWW_WAIT);

}

/* WARNING: This function is really a last resort.

 * Threads should be signaled and then exit by themselves.

 * TerminateThread() doesn't perform stack and DLL cleanup.

 */

void SDL_SYS_KillThread(SDL_Thread *thread)

{

  DosKillThread(thread->handle);

}