mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-21 04:31:04 +08:00
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
/* Commit an elided pthread lock.
|
|
Copyright (C) 2014-2015 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>
|
|
|
|
int
|
|
__lll_unlock_elision(int *futex, int private)
|
|
{
|
|
/* If the lock is free, we elided the lock earlier. This does not
|
|
necessarily mean that we are in a transaction, because the user code may
|
|
have closed the transaction, but that is impossible to detect reliably. */
|
|
if (*futex == 0)
|
|
{
|
|
__asm__ volatile (".machinemode \"zarch_nohighgprs\"\n\t"
|
|
".machine \"all\""
|
|
: : : "memory");
|
|
__builtin_tend();
|
|
}
|
|
else
|
|
lll_unlock ((*futex), private);
|
|
return 0;
|
|
}
|