1 // Check that ignore_interceptors_accesses=1 supresses reporting races from 2 // system libraries on OS X. There are currently false positives coming from 3 // libxpc, libdispatch, CoreFoundation and others, because these libraries use 4 // TSan-invisible atomics as synchronization. 5 6 // RUN: %clang_tsan %s -o %t -framework Foundation 7 8 // Check that without the flag, there are false positives. 9 // RUN: %deflake %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-RACE 10 11 // With ignore_interceptors_accesses=1, no races are reported. 12 // RUN: %env_tsan_opts=ignore_interceptors_accesses=1 %run %t 2>&1 | FileCheck %s 13 14 // With ignore_interceptors_accesses=1, races in user's code are still reported. 15 // RUN: %env_tsan_opts=ignore_interceptors_accesses=1 %deflake %run %t race 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-RACE 16 17 #import <Foundation/Foundation.h> 18 19 #import "../test.h" 20 21 long global; 22 23 void *Thread1(void *x) { 24 barrier_wait(&barrier); 25 global = 42; 26 return NULL; 27 } 28 29 void *Thread2(void *x) { 30 global = 43; 31 barrier_wait(&barrier); 32 return NULL; 33 } 34 35 int main(int argc, char *argv[]) { 36 fprintf(stderr, "Hello world.\n"); 37 38 // NSUserDefaults uses XPC which triggers the false positive. 39 NSDictionary *d = [[NSUserDefaults standardUserDefaults] dictionaryRepresentation]; 40 41 if (argc > 1 && strcmp(argv[1], "race") == 0) { 42 barrier_init(&barrier, 2); 43 pthread_t t[2]; 44 pthread_create(&t[0], NULL, Thread1, NULL); 45 pthread_create(&t[1], NULL, Thread2, NULL); 46 pthread_join(t[0], NULL); 47 pthread_join(t[1], NULL); 48 } 49 50 fprintf(stderr, "Done.\n"); 51 } 52 53 // CHECK: Hello world. 54 // CHECK-RACE: SUMMARY: ThreadSanitizer: data race 55 // CHECK: Done. 56
