mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
|
|
|
|
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 <errno.h>
|
|
#include <stdlib.h>
|
|
#include "pthreadP.h"
|
|
#include <lowlevellock.h>
|
|
|
|
|
|
int
|
|
internal_function attribute_hidden
|
|
__pthread_mutex_unlock_usercnt (mutex, decr)
|
|
pthread_mutex_t *mutex;
|
|
int decr;
|
|
{
|
|
int newowner = 0;
|
|
|
|
switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP))
|
|
{
|
|
case PTHREAD_MUTEX_RECURSIVE_NP:
|
|
/* Recursive mutex. */
|
|
if (mutex->__data.__owner != THREAD_GETMEM (THREAD_SELF, tid))
|
|
return EPERM;
|
|
|
|
if (--mutex->__data.__count != 0)
|
|
/* We still hold the mutex. */
|
|
return 0;
|
|
break;
|
|
|
|
case PTHREAD_MUTEX_ERRORCHECK_NP:
|
|
/* Error checking mutex. */
|
|
if (mutex->__data.__owner != THREAD_GETMEM (THREAD_SELF, tid)
|
|
|| ! lll_mutex_islocked (mutex->__data.__lock))
|
|
return EPERM;
|
|
break;
|
|
|
|
case PTHREAD_MUTEX_TIMED_NP:
|
|
case PTHREAD_MUTEX_ADAPTIVE_NP:
|
|
/* Normal mutex. Nothing special to do. */
|
|
break;
|
|
|
|
case PTHREAD_MUTEX_ROBUST_PRIVATE_RECURSIVE_NP:
|
|
/* Recursive mutex. */
|
|
if (mutex->__data.__owner == -THREAD_GETMEM (THREAD_SELF, tid))
|
|
{
|
|
if (--mutex->__data.__count != 0)
|
|
/* We still hold the mutex. */
|
|
return ENOTRECOVERABLE;
|
|
|
|
goto notrecoverable;
|
|
}
|
|
|
|
if (mutex->__data.__owner != THREAD_GETMEM (THREAD_SELF, tid))
|
|
return EPERM;
|
|
|
|
if (--mutex->__data.__count != 0)
|
|
/* We still hold the mutex. */
|
|
return 0;
|
|
|
|
goto robust;
|
|
|
|
case PTHREAD_MUTEX_ROBUST_PRIVATE_ERRORCHECK_NP:
|
|
/* Error checking mutex. */
|
|
if (abs (mutex->__data.__owner) != THREAD_GETMEM (THREAD_SELF, tid)
|
|
|| ! lll_mutex_islocked (mutex->__data.__lock))
|
|
return EPERM;
|
|
|
|
/* FALLTHROUGH */
|
|
|
|
case PTHREAD_MUTEX_ROBUST_PRIVATE_NP:
|
|
case PTHREAD_MUTEX_ROBUST_PRIVATE_ADAPTIVE_NP:
|
|
/* If the previous owner died and the caller did not succeed in
|
|
making the state consistent, mark the mutex as unrecoverable
|
|
and make all waiters. */
|
|
if (__builtin_expect (mutex->__data.__owner
|
|
== -THREAD_GETMEM (THREAD_SELF, tid)
|
|
|| (mutex->__data.__owner
|
|
== PTHREAD_MUTEX_NOTRECOVERABLE), 0))
|
|
notrecoverable:
|
|
newowner = PTHREAD_MUTEX_NOTRECOVERABLE;
|
|
|
|
robust:
|
|
/* Remove mutex from the list. */
|
|
DEQUEUE_MUTEX (mutex);
|
|
break;
|
|
|
|
default:
|
|
/* Correct code cannot set any other type. */
|
|
return EINVAL;
|
|
}
|
|
|
|
/* Always reset the owner field. */
|
|
mutex->__data.__owner = newowner;
|
|
if (decr)
|
|
/* One less user. */
|
|
--mutex->__data.__nusers;
|
|
|
|
/* Unlock. */
|
|
lll_mutex_unlock (mutex->__data.__lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
__pthread_mutex_unlock (mutex)
|
|
pthread_mutex_t *mutex;
|
|
{
|
|
return __pthread_mutex_unlock_usercnt (mutex, 1);
|
|
}
|
|
strong_alias (__pthread_mutex_unlock, pthread_mutex_unlock)
|
|
strong_alias (__pthread_mutex_unlock, __pthread_mutex_unlock_internal)
|