test/tsan/race_with_finished_thread.cc

   1 // RUN: %clangxx_tsan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s
   2 #include <pthread.h>
   3 #include <stddef.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7
   8 // Ensure that we can restore a stack of a finished thread.
   9
  10 int g_data;
  11
  12 void __attribute__((noinline)) foobar(int *p) {
  13   *p = 42;
  14 }
  15
  16 void *Thread1(void *x) {
  17   foobar(&g_data);
  18   return NULL;
  19 }
  20
  21 void *Thread2(void *x) {
  22   sleep(1);
  23   g_data = 43;
  24   return NULL;
  25 }
  26
  27 int main() {
  28   pthread_t t[2];
  29   pthread_create(&t[0], NULL, Thread1, NULL);
  30   pthread_create(&t[1], NULL, Thread2, NULL);
  31   pthread_join(t[0], NULL);
  32   pthread_join(t[1], NULL);
  33   return 0;
  34 }
  35
  36 // CHECK: WARNING: ThreadSanitizer: data race
  37 // CHECK:   Write of size 4 at {{.*}} by thread T2:
  38 // CHECK:   Previous write of size 4 at {{.*}} by thread T1:
  39 // CHECK:     #0 foobar
  40 // CHECK:     #1 Thread1
  41 // CHECK:   Thread T1 (tid={{.*}}, finished) created by main thread at:
  42 // CHECK:     #0 pthread_create
  43 // CHECK:     #1 main