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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-08-05 11:27:35 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-08-05 17:07:57 -0300 |
| commit | c6af8a9a3ce137a9704825d173be22a2b2d9cb49 (patch) | |
| tree | daa57dfeb5ae6e1d1c61b7b414400b3bb28d3546 /stdlib/tst-concurrent-quick_exit.c | |
| parent | 5097cd344fd243fb8deb6dec96e8073753f962f9 (diff) | |
| download | glibc-c6af8a9a3ce137a9704825d173be22a2b2d9cb49.tar.xz glibc-c6af8a9a3ce137a9704825d173be22a2b2d9cb49.zip | |
stdlib: Allow concurrent quick_exit (BZ 31997)
As for exit, also allows concurrent quick_exit to avoid race
conditions when it is called concurrently. Since it uses the same
internal function as exit, the __exit_lock lock is moved to
__run_exit_handlers. It also solved a potential concurrent when
calling exit and quick_exit concurrently.
The test case 'expected' is expanded to a value larger than the
minimum required by C/POSIX (32 entries) so at_quick_exit() will
require libc to allocate a new block. This makes the test mre likely to
trigger concurrent issues (through free() at __run_exit_handlers)
if quick_exit() interacts with the at_quick_exit list concurrently.
This is also the latest interpretation of the Austin Ticket [1].
Checked on x86_64-linux-gnu.
[1] https://austingroupbugs.net/view.php?id=1845
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'stdlib/tst-concurrent-quick_exit.c')
| -rw-r--r-- | stdlib/tst-concurrent-quick_exit.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/stdlib/tst-concurrent-quick_exit.c b/stdlib/tst-concurrent-quick_exit.c new file mode 100644 index 0000000000..3f321668d6 --- /dev/null +++ b/stdlib/tst-concurrent-quick_exit.c @@ -0,0 +1,22 @@ +/* Check if quick_exit can be called concurrently by multiple threads. + Copyright (C) 2024 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 + <https://www.gnu.org/licenses/>. */ + +#define EXIT(__r) quick_exit (__r) +#define ATEXIT(__f) at_quick_exit (__f) + +#include "tst-concurrent-exit-skeleton.c" |