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	util.c - libzahl - big integer library
	git clone git://git.suckless.org/libzahl
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	util.c (798B)
	---
	1 #define COMPILING_UTIL_C
	2 #include "util.h"
	3
	4
	5 char timebuf[512];
	6 unsigned long long int freq;
	7
	8
	9 void
	10 benchmark_init(void)
	11 {
	12 #if defined(__linux__) && defined(USE_RDTSC)
	13 cpu_set_t cpuset;
	14 FILE *f;
	15 char *line = 0;
	16 size_t size = 0;
	17 char path[PATH_MAX];
	18 CPU_ZERO(&cpuset);
	19 CPU_SET(USE_CPU, &cpuset);
	20 sched_setaffinity(getpid(), sizeof(cpuset), &cpuset);
	21 sprintf(path, "/sys/devices/system/cpu/cpu%i/cpufreq/cpuinfo_max…
	22 f = fopen(path, "r");
	23 if (getline(&line, &size, f) < 0)
	24 abort();
	25 fclose(f);
	26 freq = strtoull(line, 0, 10);
	27 free(line);
	28
	29 #elif defined(__linux__)
	30 cpu_set_t cpuset;
	31 CPU_ZERO(&cpuset);
	32 CPU_SET(USE_CPU, &cpuset);
	33 sched_setaffinity(getpid(), sizeof(cpuset), &cpuset);
	34
	35 #else
	36 fprintf(stderr, "WARNING: Don't know how to set CPU affinity.\n"…
	37
	38 #endif
	39 }