Merge tag 'qemu-macppc-20230206' of https://github.com/mcayland/qemu into staging
[qemu.git] / util / qemu-timer-common.c
blobcc1326f72646c4063adb691b4dc9260ecd172aaf
1 /*
2 * QEMU System Emulator
4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
24 #include "qemu/osdep.h"
25 #include "qemu/timer.h"
27 /***********************************************************/
28 /* real time host monotonic timer */
30 int64_t clock_start;
32 #ifdef _WIN32
34 int64_t clock_freq;
36 static void __attribute__((constructor)) init_get_clock(void)
38 LARGE_INTEGER freq;
39 int ret;
40 ret = QueryPerformanceFrequency(&freq);
41 if (ret == 0) {
42 fprintf(stderr, "Could not calibrate ticks\n");
43 exit(1);
45 clock_freq = freq.QuadPart;
46 clock_start = get_clock();
49 #else
51 int use_rt_clock;
53 static void __attribute__((constructor)) init_get_clock(void)
55 struct timespec ts;
57 use_rt_clock = 0;
58 if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
59 use_rt_clock = 1;
61 clock_start = get_clock();
63 #endif