barrier/lib/arch/CArchSleepUnix.cpp

/*
 * synergy-plus -- mouse and keyboard sharing utility
 * Copyright (C) 2009 The Synergy+ Project
 * Copyright (C) 2002 Chris Schoeneman
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file COPYING that should have accompanied this file.
 * 
 * This package 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "CArchSleepUnix.h"
#include "CArch.h"
#if TIME_WITH_SYS_TIME
#	include <sys/time.h>
#	include <time.h>
#else
#	if HAVE_SYS_TIME_H
#		include <sys/time.h>
#	else
#		include <time.h>
#	endif
#endif
#if !HAVE_NANOSLEEP
#	if HAVE_SYS_SELECT_H
#		include <sys/select.h>
#	endif
#	if HAVE_SYS_TYPES_H
#		include <sys/types.h>
#	endif
#	if HAVE_UNISTD_H
#		include <unistd.h>
#	endif
#endif

//
// CArchSleepUnix
//

CArchSleepUnix::CArchSleepUnix()
{
	// do nothing
}

CArchSleepUnix::~CArchSleepUnix()
{
	// do nothing
}

void
CArchSleepUnix::sleep(double timeout)
{
	ARCH->testCancelThread();
	if (timeout < 0.0) {
		return;
	}

#if HAVE_NANOSLEEP
	// prep timeout
	struct timespec t;
	t.tv_sec  = (long)timeout;
	t.tv_nsec = (long)(1.0e+9 * (timeout - (double)t.tv_sec));

	// wait
	while (nanosleep(&t, &t) < 0)
		ARCH->testCancelThread();
#else
	/* emulate nanosleep() with select() */
	double startTime = ARCH->time();
	double timeLeft  = timeout;
	while (timeLeft > 0.0) {
		struct timeval timeout2;
		timeout2.tv_sec  = static_cast<int>(timeLeft);
		timeout2.tv_usec = static_cast<int>(1.0e+6 * (timeLeft -
														timeout2.tv_sec));
		select((SELECT_TYPE_ARG1)  0,
				SELECT_TYPE_ARG234 NULL,
				SELECT_TYPE_ARG234 NULL,
				SELECT_TYPE_ARG234 NULL,
				SELECT_TYPE_ARG5   &timeout2);
		ARCH->testCancelThread();
		timeLeft = timeout - (ARCH->time() - startTime);
	}
#endif
}