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))
Run(int idx)12 void Run(int idx) {
13 for (int i = 0, n = len; i < n; i++)
14 if (a[i] != i) abort();
15 }
16
Thread(void * arg)17 void *Thread(void *arg) {
18 long idx = (long)arg;
19 printf("Thread %ld started\n", idx);
20 for (int i = 0; i < kNumIter; i++)
21 Run(idx);
22 printf("Thread %ld done\n", idx);
23 return 0;
24 }
25
main(int argc,char ** argv)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(argv[1]);
33 assert(n_threads > 0 && n_threads <= 32);
34 len = atoi(argv[2]);
35 }
36 printf("%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(&t[i], 0, Thread, (void*)i);
44 }
45 for (int i = 0; i < n_threads; i++) {
46 pthread_join(t[i], 0);
47 }
48 delete [] t;
49 delete [] a;
50 return 0;
51 }
52