| 1 | // Mini-benchmark for tsan: shared memory reads. |
|---|
| 2 | #include <pthread.h> |
|---|
| 3 | #include <stdio.h> |
|---|
| 4 | #include <stdlib.h> |
|---|
| 5 | #include <assert.h> |
|---|
| 6 | |
|---|
| 7 | int len; |
|---|
| 8 | int *a; |
|---|
| 9 | const int kNumIter = 1000; |
|---|
| 10 | |
|---|
| 11 | __attribute__((noinline)) |
|---|
| 12 | void Run(int idx) { |
|---|
| 13 | for (int i = 0, n = len; i < n; i++) |
|---|
| 14 | if (a[i] != i) abort(); |
|---|
| 15 | } |
|---|
| 16 | |
|---|
| 17 | void *Thread(void *arg) { |
|---|
| 18 | long idx = (long)arg; |
|---|
| 19 | printf(format: "Thread %ld started\n" , idx); |
|---|
| 20 | for (int i = 0; i < kNumIter; i++) |
|---|
| 21 | Run(idx); |
|---|
| 22 | printf(format: "Thread %ld done\n" , idx); |
|---|
| 23 | return 0; |
|---|
| 24 | } |
|---|
| 25 | |
|---|
| 26 | int main(int argc, char **argv) { |
|---|
| 27 | int n_threads = 0; |
|---|
| 28 | if (argc != 3) { |
|---|
| 29 | n_threads = 4; |
|---|
| 30 | len = 1000000; |
|---|
| 31 | } else { |
|---|
| 32 | n_threads = atoi(nptr: argv[1]); |
|---|
| 33 | assert(n_threads > 0 && n_threads <= 32); |
|---|
| 34 | len = atoi(nptr: argv[2]); |
|---|
| 35 | } |
|---|
| 36 | printf(format: "%s: n_threads=%d len=%d iter=%d\n" , |
|---|
| 37 | __FILE__, n_threads, len, kNumIter); |
|---|
| 38 | a = new int[len]; |
|---|
| 39 | for (int i = 0, n = len; i < n; i++) |
|---|
| 40 | a[i] = i; |
|---|
| 41 | pthread_t *t = new pthread_t[n_threads]; |
|---|
| 42 | for (int i = 0; i < n_threads; i++) { |
|---|
| 43 | pthread_create(newthread: &t[i], attr: 0, start_routine: Thread, arg: (void*)i); |
|---|
| 44 | } |
|---|
| 45 | for (int i = 0; i < n_threads; i++) { |
|---|
| 46 | pthread_join(th: t[i], thread_return: 0); |
|---|
| 47 | } |
|---|
| 48 | delete [] t; |
|---|
| 49 | delete [] a; |
|---|
| 50 | return 0; |
|---|
| 51 | } |
|---|
| 52 | |
|---|
