compiler-rt/test/tsan/pthread_atfork_deadlock.c

   1 // RUN: %clang_tsan -O1 %s -lpthread -o %t && %deflake %run %t | FileCheck %s
   2 // Regression test for
   3 // https://github.com/google/sanitizers/issues/468
   4 // When the data race was reported, pthread_atfork() handler used to be
   5 // executed which caused another race report in the same thread, which resulted
   6 // in a deadlock.
   7 #include "test.h"
   8
   9 int glob = 0;
  10
  11 void *worker(void *unused) {
  12   barrier_wait(&barrier);
  13   glob++;
  14   return NULL;
  15 }
  16
  17 void atfork() {
  18   fprintf(stderr, "ATFORK\n");
  19   glob++;
  20 }
  21
  22 int main() {
  23   barrier_init(&barrier, 2);
  24   pthread_atfork(atfork, atfork, atfork);
  25   pthread_t t;
  26   pthread_create(&t, NULL, worker, NULL);
  27   glob++;
  28   barrier_wait(&barrier);
  29   pthread_join(t, NULL);
  30   // CHECK: ThreadSanitizer: data race
  31   // CHECK-NOT: ATFORK
  32   return 0;
  33 }