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64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/timer.h"
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/***********************************************************/
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/* real time host monotonic timer */
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#ifdef _WIN32
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int64_t clock_freq;
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static void __attribute__((constructor)) init_get_clock(void)
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{
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LARGE_INTEGER freq;
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int ret;
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ret = QueryPerformanceFrequency(&freq);
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if (ret == 0) {
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fprintf(stderr, "Could not calibrate ticks\n");
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exit(1);
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}
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clock_freq = freq.QuadPart;
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}
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#else
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int use_rt_clock;
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static void __attribute__((constructor)) init_get_clock(void)
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{
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use_rt_clock = 0;
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#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \
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|| defined(__DragonFly__) || defined(__FreeBSD_kernel__) \
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|| defined(__OpenBSD__)
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{
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
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use_rt_clock = 1;
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}
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}
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#endif
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}
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#endif
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