compiler-rt/test/lsan/TestCases/leak_check_before_thread_started.cpp

   1 // Regression test for http://llvm.org/bugs/show_bug.cgi?id=21621
   2 // This test relies on timing between threads, so any failures will be flaky.
   3 // RUN: %clangxx_lsan %s -o %t
   4 // RUN: %env_lsan_opts="log_pointers=1:log_threads=1" %run %t
   5 #include <assert.h>
   6 #include <pthread.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9
  10 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
  11 pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
  12 bool flag = false;
  13
  14 void *func(void *arg) {
  15   // This mutex will never be grabbed.
  16   fprintf(stderr, "entered func()\n");
  17   pthread_mutex_lock(&mutex);
  18   free(arg);
  19   pthread_mutex_unlock(&mutex);
  20   return 0;
  21 }
  22
  23 void create_detached_thread() {
  24   pthread_t thread_id;
  25   pthread_attr_t attr;
  26
  27   pthread_attr_init(&attr);
  28   pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  29
  30   void *arg = malloc(1337);
  31   assert(arg);
  32   // This mutex is never unlocked by the main thread.
  33   pthread_mutex_lock(&mutex);
  34   int res = pthread_create(&thread_id, &attr, func, arg);
  35   assert(res == 0);
  36 }
  37
  38 int main() {
  39   create_detached_thread();
  40 }