1 // RUN: %clangxx_tsan -c -O1 -fno-sanitize=thread %s -o %t.o 2 // RUN: %clangxx_tsan -O1 %s %t.o -o %t && %run %t 2>&1 | FileCheck %s 3 4 #include <stdio.h> 5 #include <stdlib.h> 6 7 #if !__has_feature(thread_sanitizer) 8 9 // Defined by tsan. 10 extern "C" void *__interceptor_malloc(unsigned long size); 11 extern "C" void __interceptor_free(void *p); 12 extern "C" void *malloc(unsigned long size) { 13 static int first = 0; 14 if (__sync_lock_test_and_set(&first, 1) == 0) 15 fprintf(stderr, "user malloc\n"); 16 return __interceptor_malloc(size); 17 } 18 19 extern "C" void free(void *p) { 20 __interceptor_free(p); 21 } 22 23 #else 24 25 int main() { 26 volatile char *p = (char*)malloc(10); 27 p[0] = 0; 28 free((void*)p); 29 } 30 31 #endif 32 33 // CHECK: user malloc 34 // CHECK-NOT: ThreadSanitizer 35 36