1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 // CHECK-NOT: ThreadSanitizer: data race 3 // CHECK: DONE 4 5 // pthread barriers are not available on OS X 6 // UNSUPPORTED: darwin 7 8 #include <stdio.h> 9 #include <stdlib.h> 10 #include <pthread.h> 11 #include <unistd.h> 12 13 const int kSize = 4; 14 volatile int kIter = 10; // prevent unwinding 15 int data[2][kSize]; 16 pthread_barrier_t barrier; 17 18 void *thr(void *p) { 19 int idx = (int)(long)p; 20 for (int i = 0; i < kIter; i++) { 21 int *prev = data[i % 2]; 22 int *curr = data[(i + 1) % 2]; 23 int left = idx - 1 >= 0 ? prev[idx - 1] : 0; 24 int right = idx + 1 < kSize ? prev[idx + 1] : 0; 25 curr[idx] = (left + right) / 2; 26 pthread_barrier_wait(&barrier); 27 } 28 return 0; 29 } 30 31 int main() { 32 pthread_barrier_init(&barrier, 0, kSize); 33 pthread_t th[kSize]; 34 for (int i = 0; i < kSize; i++) 35 pthread_create(&th[i], 0, thr, (void*)(long)i); 36 for (int i = 0; i < kSize; i++) 37 pthread_join(th[i], 0); 38 pthread_barrier_destroy(&barrier); 39 fprintf(stderr, "DONE\n"); 40 } 41
