test/tsan/race_on_heap.cc

   1 // RUN: %clangxx_tsan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s
   2 #include <pthread.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5
   6 void *Thread1(void *p) {
   7   *(int*)p = 42;
   8   return 0;
   9 }
  10
  11 void *Thread2(void *p) {
  12   *(int*)p = 44;
  13   return 0;
  14 }
  15
  16 void *alloc() {
  17   return malloc(99);
  18 }
  19
  20 void *AllocThread(void* arg) {
  21   return alloc();
  22 }
  23
  24 int main() {
  25   void *p = 0;
  26   pthread_t t[2];
  27   pthread_create(&t[0], 0, AllocThread, 0);
  28   pthread_join(t[0], &p);
  29   fprintf(stderr, "addr=%p\n", p);
  30   pthread_create(&t[0], 0, Thread1, (char*)p + 16);
  31   pthread_create(&t[1], 0, Thread2, (char*)p + 16);
  32   pthread_join(t[0], 0);
  33   pthread_join(t[1], 0);
  34   return 0;
  35 }
  36
  37 // CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
  38 // CHECK: WARNING: ThreadSanitizer: data race
  39 // ...
  40 // CHECK: Location is heap block of size 99 at [[ADDR]] allocated by thread T1:
  41 // CHCEKL     #0 malloc
  42 // CHECK:     #{{1|2}} alloc
  43 // CHECK:     #{{2|3}} AllocThread
  44 // ...
  45 // CHECK:   Thread T1 (tid={{.*}}, finished) created by main thread at:
  46 // CHECK:     #0 pthread_create
  47 // CHECK:     #1 main