test/tsan/user_malloc.cc

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
   2 #include <stdio.h>
   3
   4 // defined by tsan.
   5 extern "C" void *__interceptor_malloc(unsigned long size);
   6 extern "C" void __interceptor_free(void *p);
   7
   8 extern "C" void *malloc(unsigned long size) {
   9   static int first = 0;
  10   if (__sync_lock_test_and_set(&first, 1) == 0)
  11     printf("user malloc\n");
  12   return __interceptor_malloc(size);
  13 }
  14
  15 extern "C" void free(void *p) {
  16   __interceptor_free(p);
  17 }
  18
  19 int main() {
  20   volatile char *p = (char*)malloc(10);
  21   p[0] = 0;
  22   free((void*)p);
  23 }
  24
  25 // CHECK: user malloc
  26 // CHECK-NOT: ThreadSanitizer
  27