1 // RUN: %clangxx_tsan -O0 %s -o %t 2 // RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-NORMAL 3 // RUN: %env_tsan_opts=ignore_interceptors_accesses=1 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-IGNORE 4 5 #include <errno.h> 6 #include <sys/mman.h> 7 8 #include "test.h" 9 10 extern "C" { 11 void AnnotateIgnoreReadsBegin(const char *f, int l); 12 void AnnotateIgnoreReadsEnd(const char *f, int l); 13 void AnnotateIgnoreWritesBegin(const char *f, int l); 14 void AnnotateIgnoreWritesEnd(const char *f, int l); 15 } 16 17 void *global_p; 18 19 int mmap_and_ignore_reads_and_writes() { 20 const size_t kSize = sysconf(_SC_PAGESIZE); 21 void *p = mmap(0, kSize, PROT_READ|PROT_WRITE, 22 MAP_PRIVATE|MAP_ANON, -1, 0); 23 if (p == MAP_FAILED) 24 return printf("mmap failed with %d\n", errno); 25 munmap(p, kSize); 26 27 void *new_p = mmap(p, kSize, PROT_READ|PROT_WRITE, 28 MAP_PRIVATE|MAP_ANON, -1, 0); 29 if (p == MAP_FAILED || p != new_p) 30 return printf("second mmap failed with %d\n", errno); 31 32 AnnotateIgnoreWritesBegin(__FILE__, __LINE__); 33 global_p = p; 34 AnnotateIgnoreWritesEnd(__FILE__, __LINE__); 35 barrier_wait(&barrier); 36 return 0; 37 } 38 39 void *Thread(void *a) { 40 barrier_wait(&barrier); 41 42 ((int*)global_p)[1] = 10; 43 printf("Read the zero value from mmapped memory %d\n", ((int*)global_p)[1]); 44 return 0; 45 } 46 47 int main() { 48 barrier_init(&barrier, 2); 49 pthread_t t; 50 pthread_create(&t, 0, Thread, 0); 51 if (mmap_and_ignore_reads_and_writes()) 52 return 1; 53 pthread_join(t, 0); 54 printf("OK\n"); 55 return 0; 56 } 57 58 // CHECK-NORMAL: WARNING: ThreadSanitizer: data race 59 // CHECK-NORMAL: OK 60 // CHECK-IGNORE_NOT: WARNING: ThreadSanitizer: data race 61 // CHECK-IGNORE: OK 62
