Annotation of qemu/qemu-timer-common.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * QEMU System Emulator
        !             3:  *
        !             4:  * Copyright (c) 2003-2008 Fabrice Bellard
        !             5:  *
        !             6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             7:  * of this software and associated documentation files (the "Software"), to deal
        !             8:  * in the Software without restriction, including without limitation the rights
        !             9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !            10:  * copies of the Software, and to permit persons to whom the Software is
        !            11:  * furnished to do so, subject to the following conditions:
        !            12:  *
        !            13:  * The above copyright notice and this permission notice shall be included in
        !            14:  * all copies or substantial portions of the Software.
        !            15:  *
        !            16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
        !            19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            22:  * THE SOFTWARE.
        !            23:  */
        !            24: #include "qemu-timer.h"
        !            25: 
        !            26: /***********************************************************/
        !            27: /* real time host monotonic timer */
        !            28: 
        !            29: #ifdef _WIN32
        !            30: 
        !            31: int64_t clock_freq;
        !            32: 
        !            33: static void __attribute__((constructor)) init_get_clock(void)
        !            34: {
        !            35:     LARGE_INTEGER freq;
        !            36:     int ret;
        !            37:     ret = QueryPerformanceFrequency(&freq);
        !            38:     if (ret == 0) {
        !            39:         fprintf(stderr, "Could not calibrate ticks\n");
        !            40:         exit(1);
        !            41:     }
        !            42:     clock_freq = freq.QuadPart;
        !            43: }
        !            44: 
        !            45: #else
        !            46: 
        !            47: int use_rt_clock;
        !            48: 
        !            49: static void __attribute__((constructor)) init_get_clock(void)
        !            50: {
        !            51:     use_rt_clock = 0;
        !            52: #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \
        !            53:     || defined(__DragonFly__) || defined(__FreeBSD_kernel__) \
        !            54:     || defined(__OpenBSD__)
        !            55:     {
        !            56:         struct timespec ts;
        !            57:         if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
        !            58:             use_rt_clock = 1;
        !            59:         }
        !            60:     }
        !            61: #endif
        !            62: }
        !            63: #endif

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