event_trigger_unix.cpp

这是一款2d游戏引擎

/*  $Id: event_trigger_unix.cpp,v 1.6 2003/07/20 22:30:53 grumbel Exp $
**
**  ClanLib Game SDK
**  Copyright (C) 2003  The ClanLib Team
**  For a total list of contributers see the file CREDITS.
**
**  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
**
*/

#include "Core/precomp.h"
#include "event_trigger_unix.h"

// note: this cannot be replaced by <ctime>! (timeval needs to be defined)
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

/////////////////////////////////////////////////////////////////////////////
// CL_EventTrigger_Unix construction:

CL_EventTrigger_Unix::CL_EventTrigger_Unix()
{
	pipe(wait_pipe);
}

CL_EventTrigger_Unix::~CL_EventTrigger_Unix()
{
	close(wait_pipe[0]);
	close(wait_pipe[1]);
}

/////////////////////////////////////////////////////////////////////////////
// CL_EventTrigger_Unix attributes:

bool CL_EventTrigger_Unix::get_flag() const
{
	return wait(0);
}

/////////////////////////////////////////////////////////////////////////////
// CL_EventTrigger_Unix operations:

void CL_EventTrigger_Unix::reset() const
{
	char v = 0;
	while (wait(0)) read(wait_pipe[0], &v, 1);
}

void CL_EventTrigger_Unix::set_flag()
{
	char v = 1;
	if (!wait(0)) write(wait_pipe[1], &v, 1);
}

bool CL_EventTrigger_Unix::wait(int timeout) const
{
	fd_set rfds;
	FD_ZERO(&rfds);
	FD_SET(wait_pipe[0], &rfds);

	timeval tv;
	tv.tv_sec = timeout/1000;
	tv.tv_usec = (timeout%1000)*1000;

	int result = select(wait_pipe[0]+1, &rfds, NULL, NULL, (timeout == -1) ? NULL : &tv);
	if (result <= 0) return false;

	return true;
}

/////////////////////////////////////////////////////////////////////////////
// CL_EventTrigger_Unix implementation: