CArchSleepUnix.cpp

/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012 Bolton Software Ltd.
 * 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
}