/*
    Copyright (c) 2007-2010 iMatix Corporation

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the Lesser GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ 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
    Lesser GNU General Public License for more details.

    You should have received a copy of the Lesser GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <assert.h>
#include <stdlib.h>
#ifdef _WIN32
#   include <windows.h>
#else
#   include <sys/time.h>
#   include <unistd.h>
#endif
#include "../src/stdint.hpp"

#ifdef _WIN32

static uint64_t now ()
{    
    //  Get the high resolution counter's accuracy.
    LARGE_INTEGER ticksPerSecond;
    QueryPerformanceFrequency (&ticksPerSecond);

    //  What time is it?
    LARGE_INTEGER tick;
    QueryPerformanceCounter (&tick);

    //  Convert the tick number into the number of seconds
    //  since the system was started.
    double ticks_div = (double) (ticksPerSecond.QuadPart / 1000000);     
    return (uint64_t) (tick.QuadPart / ticks_div);
}

void perf_sleep (int seconds_)
{
    Sleep (seconds_ * 1000);
}

#else /* not _WIN32 */

static uint64_t now ()
{
    struct timeval tv;
    int rc;

    rc = gettimeofday (&tv, NULL);
    assert (rc == 0);
    return (tv.tv_sec * (uint64_t) 1000000 + tv.tv_usec);
}

void perf_sleep (int seconds_)
{
    sleep (seconds_);
}

#endif /* _WIN32 */

void *stopwatch_start ()
{
    uint64_t *watch = (uint64_t*) malloc (sizeof (uint64_t));
    assert (watch);
    *watch = now ();
    return (void*) watch;
}

unsigned long stopwatch_stop (void *watch_)
{
    uint64_t end = now ();
    uint64_t start = *(uint64_t*) watch_;
    free (watch_);
    return (unsigned long) (end - start);
}