Annotation of qemu/qemu-timer-common.c, revision 1.1.1.1

1.1       root        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

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