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/* Copyright (C) 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <inline-syscall.h>
#include <pthreadP.h>
#include <synch.h>
#include <errno.h>
#include <synchP.h>
DECLARE_INLINE_SYSCALL (int, lwp_mutex_unlock, mutex_t *lp);
int __mutex_unlock_fast (mutex_t *mutex);
int mutex_unlock (mutex)
mutex_t *mutex;
{
/* Handle inconsistent robust mutexes. */
if ((mutex->mutex_type & LOCK_ROBUST) &&
(mutex->mutex_flag & LOCK_NOTRECOVERABLE))
return ENOTRECOVERABLE;
/* Always hit the kernel for priority inherit locks. */
if ((mutex->mutex_type & LOCK_PRIO_INHERIT) == 0)
{
int result = __mutex_unlock_fast (mutex);
if(result >= 0)
return result;
}
else
{
/* Except when we already hold a recursive lock. */
if ((mutex->mutex_type & LOCK_RECURSIVE) && MUTEX_IS_OWNER (mutex) &&
mutex->mutex_rcount > 0)
{
--mutex->mutex_rcount;
return 0;
}
}
/* The kernel does not clear mutex_owner so we clear it here. */
mutex->mutex_owner = 0;
int errval = INLINE_SYSCALL (lwp_mutex_unlock, 1, mutex);
if (errval != 0)
return errval;
/* The kernel does not clear the lockbyte for priority inherit mutexes. */
if (mutex->mutex_type & LOCK_PRIO_INHERIT)
mutex->mutex_lockbyte = 0;
return errval;
}
weak_alias (mutex_unlock, _lwp_mutex_unlock)
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