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The previous barrier implementation did not fulfill the POSIX requirements
for when a barrier can be destroyed. Specifically, it was possible that
threads that haven't noticed yet that their round is complete still access
the barrier's memory, and that those accesses can happen after the barrier
has been legally destroyed.
The new algorithm does not have this issue, and it avoids using a lock
internally.
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Include stdlib.h to get declaration of exit(3)
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2004-03-07 Ulrich Drepper <drepper@redhat.com>
* tst-once4.c: Remove unnecessary macro definition.
* tst-mutex7.c (do_test): Limit thread stack size.
* tst-once2.c (do_test): Likewise.
* tst-tls3.c (do_test): Likewise.
* tst-tls1.c (do_test): Likewise.
* tst-signal3.c (do_test): Likewise.
* tst-kill6.c (do_test): Likewise.
* tst-key4.c (do_test): Likewise.
* tst-join4.c (do_test): Likewise.
* tst-fork1.c (do_test): Likewise.
* tst-context1.c (do_test): Likewise.
* tst-cond2.c (do_test): Likewise.
* tst-cond10.c (do_test): Likewise.
* tst-clock2.c (do_test): Likewise.
* tst-cancel10.c (do_test): Likewise.
* tst-basic2.c (do_test): Likewise.
* tst-barrier4.c (do_test): Likewise.
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* sysdeps/unix/sysv/linux/i386/i486/pthread_barrier_wait.S
(pthread_barrier_wait): After wakeup, release lock only when the
last thread stopped using the barrier object.
* sysdeps/unix/sysv/linux/x86_64/pthread_barrier_wait.S
(pthread_barrier_wait): Likewise.
* sysdeps/pthread/pthread_barrier_wait.c (pthread_barrier_wait):
Likewise.
* Makefile (tests): Add tst-barrier4.
* tst-barrier4.c: New file.
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