52 lines
1.1 KiB
C++
52 lines
1.1 KiB
C++
// Mini-benchmark for tsan: shared memory reads.
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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int len;
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int *a;
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const int kNumIter = 1000;
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__attribute__((noinline))
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void Run(int idx) {
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for (int i = 0, n = len; i < n; i++)
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if (a[i] != i) abort();
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}
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void *Thread(void *arg) {
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long idx = (long)arg;
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printf("Thread %ld started\n", idx);
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for (int i = 0; i < kNumIter; i++)
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Run(idx);
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printf("Thread %ld done\n", idx);
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return 0;
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}
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int main(int argc, char **argv) {
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int n_threads = 0;
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if (argc != 3) {
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n_threads = 4;
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len = 1000000;
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} else {
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n_threads = atoi(argv[1]);
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assert(n_threads > 0 && n_threads <= 32);
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len = atoi(argv[2]);
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}
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printf("%s: n_threads=%d len=%d iter=%d\n",
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__FILE__, n_threads, len, kNumIter);
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a = new int[len];
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for (int i = 0, n = len; i < n; i++)
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a[i] = i;
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pthread_t *t = new pthread_t[n_threads];
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for (int i = 0; i < n_threads; i++) {
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pthread_create(&t[i], 0, Thread, (void*)i);
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}
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for (int i = 0; i < n_threads; i++) {
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pthread_join(t[i], 0);
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}
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delete [] t;
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delete [] a;
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return 0;
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}
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