1 files changed, 80 insertions, 0 deletions
diff --git a/stdlib/test-dlclose-exit-race.c b/stdlib/test-dlclose-exit-race.c
new file mode 100644
index 0000000000..9ec294e168
--- /dev/null
+++ b/stdlib/test-dlclose-exit-race.c
@@ -0,0 +1,80 @@
+/* Test for exit/dlclose race (Bug 22180).
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This file must be run from within a directory called "stdlib".  */
+
+/* This test verifies that when dlopen in one thread races against exit
+   in another thread, we don't call registered destructor twice.
+
+   Expected result:
+     second
+     first
+     ... clean termination
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <semaphore.h>
+#include <support/check.h>
+#include <support/xdlfcn.h>
+#include <support/xthread.h>
+
+/* Semaphore to ensure we have a happens-before between the first function
+   starting and exit being called.  */
+sem_t order1;
+
+/* Semaphore to ensure we have a happens-before between the second function
+   starting and the first function returning.  */
+sem_t order2;
+
+void *
+exit_thread (void *arg)
+{
+  /* Wait for the dlclose to start...  */
+  sem_wait (&order1);
+  /* Then try to run the exit sequence which should call all
+     __cxa_atexit registered functions and in parallel with
+     the executing dlclose().  */
+  exit (0);
+}
+
+
+void
+last (void)
+{
+  /* Let dlclose thread proceed.  */
+  sem_post (&order2);
+}
+
+int
+main (void)
+{
+  void *dso;
+  pthread_t thread;
+
+  atexit (last);
+
+  dso = xdlopen ("$ORIGIN/test-dlclose-exit-race-helper.so",
+		 RTLD_NOW|RTLD_GLOBAL);
+  thread = xpthread_create (NULL, exit_thread, NULL);
+
+  xdlclose (dso);
+  xpthread_join (thread);
+
+  FAIL_EXIT1 ("Did not terminate via exit(0) in exit_thread() as expected.");
+}