| /* Test for exit/dlclose race (Bug 22180). |
| Copyright (C) 2017-2018 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."); |
| } |