glibc.git/stdlib/tst-concurrent-exit-skeleton.c, branch master Unnamed repository; edit this file 'description' to name the repository. Update copyright dates with scripts/update-copyrights 2025-01-01T19:22:09+00:00 Paul Eggert eggert@cs.ucla.edu 2025-01-01T18:14:45+00:00 2642002380aafb71a1d3b569b6d7ebeab3284816 






stdlib: Allow concurrent quick_exit (BZ 31997)
2024-08-05T20:07:57+00:00

Adhemerval Zanella
adhemerval.zanella@linaro.org

2024-08-05T14:27:35+00:00

c6af8a9a3ce137a9704825d173be22a2b2d9cb49

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>





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>