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35 lines
692 B
C
35 lines
692 B
C
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#include <time.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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static double cpufrequency = 0;
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static void init(void)
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{
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long result = 0; size_t resultlen = sizeof(long);
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sysctlbyname("machdep.tsc_freq",&result,&resultlen,0,0);
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cpufrequency = result;
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}
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long long cpucycles_monotonic(void)
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{
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double result;
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struct timespec t;
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if (!cpufrequency) init();
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clock_gettime(CLOCK_MONOTONIC,&t);
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result = t.tv_nsec;
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result *= 0.000000001;
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result += (double) t.tv_sec;
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result *= cpufrequency;
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return result;
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}
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long long cpucycles_monotonic_persecond(void)
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{
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if (!cpufrequency) init();
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return cpufrequency;
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}
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