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https://github.com/servalproject/serval-dna.git
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39 lines
757 B
C
39 lines
757 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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FILE *f;
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f = popen("hinv -c processor | awk '{if ($3==\"MHZ\") print $2*1000000}'","r");
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if (!f) return;
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if (fscanf(f,"%lf",&cpufrequency) < 1) cpufrequency = 0;
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pclose(f);
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if (!cpufrequency) return;
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}
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long long cpucycles_sgi(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_SGI_CYCLE,&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_sgi_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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