compiler-rt/test/tsan/race_on_heap.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include <pthread.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include "test.h"
   6
   7 void *Thread1(void *p) {
   8   *(int*)p = 42;
   9   return 0;
  10 }
  11
  12 void *Thread2(void *p) {
  13   *(int*)p = 44;
  14   return 0;
  15 }
  16
  17 __attribute__((noinline)) void *alloc() {
  18   return malloc(99);
  19 }
  20
  21 void *AllocThread(void* arg) {
  22   return alloc();
  23 }
  24
  25 int main() {
  26   void *p = 0;
  27   pthread_t t[2];
  28   pthread_create(&t[0], 0, AllocThread, 0);
  29   pthread_join(t[0], &p);
  30   print_address("addr=", 1, p);
  31   pthread_create(&t[0], 0, Thread1, (char*)p + 16);
  32   pthread_create(&t[1], 0, Thread2, (char*)p + 16);
  33   pthread_join(t[0], 0);
  34   pthread_join(t[1], 0);
  35   return 0;
  36 }
  37
  38 // CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
  39 // CHECK: WARNING: ThreadSanitizer: data race
  40 // ...
  41 // CHECK: Location is heap block of size 99 at [[ADDR]] allocated by thread T1:
  42 // CHECK:     #0 malloc
  43 // CHECK:     #{{1|2}} alloc
  44 // CHECK:     #{{2|3}} AllocThread
  45 // ...
  46 // CHECK:   Thread T1 (tid={{.*}}, finished) created by main thread at:
  47 // CHECK:     #0 pthread_create
  48 // CHECK:     #1 main