2 * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
3 * Licensed under GPLv2.
9 #include <sys/syscall.h>
12 #include <linux/futex.h>
16 #define ITERATIONS 100000000
18 #define futex(A, B, C, D, E, F) syscall(__NR_futex, A, B, C, D, E, F)
22 struct timespec ts_start, ts_end;
23 unsigned long i = ITERATIONS;
25 clock_gettime(CLOCK_MONOTONIC, &ts_start);
28 unsigned int addr = 0;
29 futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);
32 clock_gettime(CLOCK_MONOTONIC, &ts_end);
34 printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
41 return test_harness(test_futex, "futex_bench");