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/osdep.h" |
25 | #include "qemu/timer.h" |
26 | |
27 | /***********************************************************/ |
28 | /* real time host monotonic timer */ |
29 | |
30 | #ifdef _WIN32 |
31 | |
32 | int64_t clock_freq; |
33 | |
34 | static void __attribute__((constructor)) init_get_clock(void) |
35 | { |
36 | LARGE_INTEGER freq; |
37 | int ret; |
38 | ret = QueryPerformanceFrequency(&freq); |
39 | if (ret == 0) { |
40 | fprintf(stderr, "Could not calibrate ticks\n" ); |
41 | exit(1); |
42 | } |
43 | clock_freq = freq.QuadPart; |
44 | } |
45 | |
46 | #else |
47 | |
48 | int use_rt_clock; |
49 | |
50 | static void __attribute__((constructor)) init_get_clock(void) |
51 | { |
52 | use_rt_clock = 0; |
53 | #ifdef CLOCK_MONOTONIC |
54 | { |
55 | struct timespec ts; |
56 | if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) { |
57 | use_rt_clock = 1; |
58 | } |
59 | } |
60 | #endif |
61 | } |
62 | #endif |
63 | |