328d4ead7a
- Linking shared libraries needs slightly different options. - We were trying to detect mach_time.h but needed to detect mach/mach_time.h instead. While we're here, add a --disable-shared option to ./configure, which is different from --enable-static. --disable-shared does not build *new* share libraries, but doesn't pass -static to the linker (apparently there is no static linking posible on MacOS).
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
#define __GNU_SOURCE
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/*
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* Returns the kernel monotonic timestamp in microseconds.
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* This function never returns the value 0; it returns 1 instead, so that
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* 0 can be used as a magic value.
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*/
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#include "monotime.h"
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#include "redoconf.h"
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#if HAVE_CLOCK_GETTIME
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#include <time.h>
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#include <stdio.h>
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#include <stdlib.h>
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long long monotime(void) {
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
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perror("clock_gettime");
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exit(98); /* really should never happen, so don't try to recover */
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}
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long long result = ts.tv_sec * 1000000LL + ts.tv_nsec / 1000;
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return !result ? 1 : result;
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}
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#elif HAVE_MACH__MACH_TIME_H
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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long long monotime(void) {
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static mach_timebase_info_data_t timebase;
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if (!timebase.denom) mach_timebase_info(&timebase);
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long long result = (mach_absolute_time() * timebase.numer /
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timebase.denom / 1000);
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return !result ? 1 : result;
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}
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#elif HAVE_WINDOWS_H
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#include <windows.h>
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/* WARNING: Not carefully tested. It might wrap around unexpectedly.
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* Based on suggestions from:
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* https://stackoverflow.com/questions/211257/windows-monotonic-clock
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*/
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long long monotime(void) {
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LARGE_INTEGER tps, t;
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QueryPerformanceFrequency(&tps);
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QueryPerformanceCounter(&t);
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return t.QuadPart * 1000000LL / tps.QuadPart;
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}
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#else
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#error "No monotonic time function is available"
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#endif
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