sdl_systhread.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    [e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id: SDL_systhread.c,v 1.4 2002/04/22 21:38:02 wmay Exp $";
#endif

/* BeOS thread management routines for SDL */

#include "SDL_error.h"
#include "SDL_mutex.h"
#include "SDL_thread.h"
#include "SDL_thread_c.h"
#include "SDL_systhread.h"
#include "mydebug.h"

typedef struct {
	int (*func)(void *);
	void *data;
	SDL_Thread *info;
	struct Task *wait;
} thread_args;

#ifndef MORPHOS

#if defined(__SASC) && !defined(__PPC__) 
__saveds __asm Uint32 RunThread(register __a0 char *args )
#elif defined(__PPC__)
Uint32 RunThread(char *args)
#else
Uint32 __saveds RunThread(char *args __asm("a0") )
#endif
{
	#ifdef STORMC4_WOS
	thread_args *data=(thread_args *)args;
	#else
	thread_args *data=(thread_args *)atol(args);
	#endif

	struct Task *Father;

	D(bug("Received data: %lx\n",data));
	Father=data->wait;

	SDL_RunThread(data);

	Signal(Father,SIGBREAKF_CTRL_F);
	D(bug("Thread with data %lx ended\n",data));
	return(0);
}

#else

#include <emul/emulinterface.h>

Uint32 RunTheThread(void)
{
	thread_args *data=(thread_args *)atol((char *)REG_A0);
	struct Task *Father;

	D(bug("Received data: %lx\n",data));
	Father=data->wait;

	SDL_RunThread(data);

	Signal(Father,SIGBREAKF_CTRL_F);
	D(bug("Thread with data %lx ended\n",data));
	return(0);
}

struct EmulLibEntry RunThreadStruct=
{
	TRAP_LIB,
	0,
	(ULONG)RunTheThread
};

void *RunThread=&RunThreadStruct;
#endif


int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
{
	/* Create the thread and go! */
	char buffer[20];

	D(bug("Sending %lx to the new thread...\n",args));

	if(args)
		sprintf(buffer,"%ld",args);

	#ifdef STORMC4_WOS
	thread->handle=CreateTaskPPCTags(TASKATTR_CODE,	RunThread,
					TASKATTR_NAME,	"SDL subtask",
					TASKATTR_STACKSIZE, 100000,
					(args ? TASKATTR_R3 : TAG_IGNORE), args,
					TASKATTR_INHERITR2, TRUE,
					TAG_DONE);
	#else
	thread->handle=(struct Task *)CreateNewProcTags(NP_Output,Output(),
					NP_Name,(ULONG)"SDL subtask",
					NP_CloseOutput, FALSE,
					NP_StackSize,20000,
					NP_Entry,(ULONG)RunThread,
					args ? NP_Arguments : TAG_IGNORE,(ULONG)buffer,
					TAG_DONE);
	#endif

	if(!thread->handle)
	{
		SDL_SetError("Not enough resources to create thread");
		return(-1);
	}

	return(0);
}

void SDL_SYS_SetupThread(void)
{
}

Uint32 SDL_ThreadID(void)
{
	return((Uint32)FindTask(NULL));
}

void SDL_SYS_WaitThread(SDL_Thread *thread)
{
	SetSignal(0L,SIGBREAKF_CTRL_F|SIGBREAKF_CTRL_C);
	Wait(SIGBREAKF_CTRL_F|SIGBREAKF_CTRL_C);
}

void SDL_SYS_KillThread(SDL_Thread *thread)
{
	Signal((struct Task *)thread->handle,SIGBREAKF_CTRL_C);
}