Simon Wiesend
1c27338be2
On Linux the clock() function measures cpu time instead of wall time. This change uses the Apple code path for Linux.
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
#include "timer.h"
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#ifdef __linux__
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// Defines strict posix compliance for CLOCK_MONOTONIC
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#define _POSIX_C_SOURCE 199309L
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#include <time.h>
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#endif
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#if __APPLE__ || __linux__
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#include <sys/time.h>
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static struct timespec start = {0, 0};
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// Starts the timer.
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void startTimer()
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{
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clock_gettime(CLOCK_MONOTONIC, &start);
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}
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// Returns the time in seconds since startTimer() was called.
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double stopTimer()
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{
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struct timespec end;
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clock_gettime(CLOCK_MONOTONIC, &end);
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unsigned long long delta_us = (end.tv_sec - start.tv_sec) * 1000000 + (end.tv_nsec - start.tv_nsec) / 1000;
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double measuredSeconds = (double)delta_us / 1000000.;
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if (start.tv_nsec > 0)
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{
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start.tv_nsec = 0;
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start.tv_sec = 0;
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}
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else
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measuredSeconds = -1;
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return measuredSeconds;
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}
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#else
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#include <time.h>
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static clock_t startClocks = 0;
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// Starts the timer.
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void startTimer()
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{
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startClocks = clock();
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}
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// Returns the time in seconds since startTimer() was called.
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double stopTimer()
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{
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double measuredSeconds = (clock() - (double)startClocks) / CLOCKS_PER_SEC;
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if (startClocks > 0)
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startClocks = 0;
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else
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measuredSeconds = -1;
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return measuredSeconds;
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}
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#endif |