Archipelago » qemu

/*

 * QEMU System Emulator

 *

 * Copyright (c) 2003-2008 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "qemu-timer.h"

/***********************************************************/

/* real time host monotonic timer */

#ifdef _WIN32

int64_t clock_freq;

static void __attribute__((constructor)) init_get_clock(void)

{

    LARGE_INTEGER freq;

    int ret;

    ret = QueryPerformanceFrequency(&freq);

    if (ret == 0) {

        fprintf(stderr, "Could not calibrate ticks\n");

        exit(1);

    }

    clock_freq = freq.QuadPart;

}

#else

int use_rt_clock;

static void __attribute__((constructor)) init_get_clock(void)

{

    use_rt_clock = 0;

#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \

    || defined(__DragonFly__) || defined(__FreeBSD_kernel__) \

    || defined(__OpenBSD__)

    {

        struct timespec ts;

        if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {

            use_rt_clock = 1;

        }

    }

#endif

}

#endif