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