50 lines · cpp
1// Mini-benchmark for tsan: non-shared memory writes.2#include <pthread.h>3#include <stdio.h>4#include <stdlib.h>5#include <assert.h>6 7int len;8int *a;9const int kNumIter = 1000;10 11__attribute__((noinline))12void Run(int idx) {13 for (int i = 0, n = len; i < n; i++)14 a[i + idx * n] = i;15}16 17void *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 26int 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[n_threads * len];39 pthread_t *t = new pthread_t[n_threads];40 for (int i = 0; i < n_threads; i++) {41 pthread_create(&t[i], 0, Thread, (void*)i);42 }43 for (int i = 0; i < n_threads; i++) {44 pthread_join(t[i], 0);45 }46 delete [] t;47 delete [] a;48 return 0;49}50