mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 09:40:13 +00:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/* elision-unlock.c: Commit an elided pthread lock.
|
|
Copyright (C) 2015-2019 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/>. */
|
|
|
|
#include "pthreadP.h"
|
|
#include "lowlevellock.h"
|
|
#include "htm.h"
|
|
|
|
int
|
|
__lll_unlock_elision (int *lock, short *adapt_count, int pshared)
|
|
{
|
|
#ifndef __SPE__
|
|
/* When the lock was free we're in a transaction. */
|
|
if (*lock == 0)
|
|
__libc_tend (0);
|
|
else
|
|
{
|
|
/* Update adapt_count in the critical section to prevent a
|
|
write-after-destroy error as mentioned in BZ 20822. The
|
|
following update of adapt_count has to be contained within
|
|
the critical region of the fall-back lock in order to not violate
|
|
the mutex destruction requirements. */
|
|
short __tmp = atomic_load_relaxed (adapt_count);
|
|
if (__tmp > 0)
|
|
atomic_store_relaxed (adapt_count, __tmp - 1);
|
|
|
|
lll_unlock ((*lock), pshared);
|
|
}
|
|
#else
|
|
lll_unlock ((*lock), pshared);
|
|
#endif
|
|
return 0;
|
|
}
|