root / qemu-timer-common.c @ 7ae63a51
History | View | Annotate | Download (2 kB)
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
|