43 lines
802 B
C
43 lines
802 B
C
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/*
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* Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
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* Licensed under GPLv2.
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <sys/syscall.h>
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#include <time.h>
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#include <unistd.h>
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#include <linux/futex.h>
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#include "utils.h"
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#define ITERATIONS 100000000
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#define futex(A, B, C, D, E, F) syscall(__NR_futex, A, B, C, D, E, F)
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int test_futex(void)
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{
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struct timespec ts_start, ts_end;
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unsigned long i = ITERATIONS;
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clock_gettime(CLOCK_MONOTONIC, &ts_start);
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while (i--) {
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unsigned int addr = 0;
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futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);
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}
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clock_gettime(CLOCK_MONOTONIC, &ts_end);
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printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
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return 0;
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}
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int main(void)
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{
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return test_harness(test_futex, "futex_bench");
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}
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