Blue Swirl | c57c846 | 2010-10-23 15:24:07 +0000 | [diff] [blame] | 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) \ |
Brad | 7ae63a5 | 2010-12-20 21:24:32 -0500 | [diff] [blame] | 53 | || defined(__DragonFly__) || defined(__FreeBSD_kernel__) \ |
| 54 | || defined(__OpenBSD__) |
Blue Swirl | c57c846 | 2010-10-23 15:24:07 +0000 | [diff] [blame] | 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 |