compiler-rt/test/tsan/race_with_finished_thread.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include "test.h"
   3
   4 // Ensure that we can restore a stack of a finished thread.
   5
   6 int g_data;
   7
   8 void __attribute__((noinline)) foobar(int *p) {
   9   *p = 42;
  10 }
  11
  12 void *Thread1(void *x) {
  13   foobar(&g_data);
  14   barrier_wait(&barrier);
  15   return NULL;
  16 }
  17
  18 void *Thread2(void *x) {
  19   barrier_wait(&barrier);
  20   sleep(1); // let the thread finish and exit
  21   g_data = 43;
  22   return NULL;
  23 }
  24
  25 int main() {
  26   barrier_init(&barrier, 2);
  27   pthread_t t[2];
  28   pthread_create(&t[0], NULL, Thread1, NULL);
  29   pthread_create(&t[1], NULL, Thread2, NULL);
  30   pthread_join(t[0], NULL);
  31   pthread_join(t[1], NULL);
  32   return 0;
  33 }
  34
  35 // CHECK: WARNING: ThreadSanitizer: data race
  36 // CHECK:   Write of size 4 at {{.*}} by thread T2:
  37 // CHECK:   Previous write of size 4 at {{.*}} by thread T1:
  38 // CHECK:     #0 foobar
  39 // CHECK:     #1 Thread1
  40 // CHECK:   Thread T1 (tid={{.*}}, finished) created by main thread at:
  41 // CHECK:     #0 pthread_create
  42 // CHECK:     #1 main