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