| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp. |
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| 4 | */ |
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| 5 | |
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| 6 | #define _GNU_SOURCE |
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| 7 | |
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| 8 | #include <stdio.h> |
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| 9 | #include <sys/syscall.h> |
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| 10 | #include <time.h> |
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| 11 | #include <unistd.h> |
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| 12 | #include <linux/futex.h> |
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| 13 | |
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| 14 | #include "utils.h" |
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| 15 | |
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| 16 | #define ITERATIONS 100000000 |
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| 17 | |
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| 18 | #define futex(A, B, C, D, E, F) syscall(__NR_futex, A, B, C, D, E, F) |
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| 19 | |
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| 20 | int test_futex(void) |
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| 21 | { |
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| 22 | struct timespec ts_start, ts_end; |
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| 23 | unsigned long i = ITERATIONS; |
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| 24 | |
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| 25 | clock_gettime(CLOCK_MONOTONIC, &ts_start); |
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| 26 | |
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| 27 | while (i--) { |
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| 28 | unsigned int addr = 0; |
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| 29 | futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0); |
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| 30 | } |
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| 31 | |
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| 32 | clock_gettime(CLOCK_MONOTONIC, &ts_end); |
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| 33 | |
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| 34 | 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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| 35 | |
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| 36 | return 0; |
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| 37 | } |
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| 38 | |
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| 39 | int main(void) |
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| 40 | { |
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| 41 | test_harness_set_timeout(300); |
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| 42 | return test_harness(test_futex, "futex_bench" ); |
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| 43 | } |
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| 44 | |
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