1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 #include "test.h" 3 4 extern "C" { 5 void AnnotateIgnoreReadsBegin(const char *f, int l); 6 void AnnotateIgnoreReadsEnd(const char *f, int l); 7 void AnnotateIgnoreWritesBegin(const char *f, int l); 8 void AnnotateIgnoreWritesEnd(const char *f, int l); 9 } 10 11 int *g; 12 13 void *Thread(void *a) { 14 int *p = 0; 15 while ((p = __atomic_load_n(&g, __ATOMIC_RELAXED)) == 0) 16 usleep(100); // spin-wait 17 *p = 42; 18 return 0; 19 } 20 21 int main() { 22 pthread_t t; 23 pthread_create(&t, 0, Thread, 0); 24 AnnotateIgnoreWritesBegin(__FILE__, __LINE__); 25 int *p = new int(0); 26 AnnotateIgnoreWritesEnd(__FILE__, __LINE__); 27 __atomic_store_n(&g, p, __ATOMIC_RELAXED); 28 pthread_join(t, 0); 29 delete p; 30 fprintf(stderr, "OK\n"); 31 return 0; 32 } 33 34 // CHECK-NOT: WARNING: ThreadSanitizer: data race 35 // CHECK: OK 36
