source: vendor/synergy/current/lib/arch/CArchSleepUnix.cpp

/*
 * synergy -- mouse and keyboard sharing utility
 * 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.
 */

#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
}