| /* |
| * 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"); |
| } |
