89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/* Copyright (C) 2002 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 "pthreadP.h"
|
|
#include <lowlevellock.h>
|
|
|
|
|
|
int
|
|
pthread_mutex_timedlock (mutex, abstime)
|
|
pthread_mutex_t *mutex;
|
|
const struct timespec *abstime;
|
|
{
|
|
struct pthread *pd = THREAD_SELF;
|
|
int result = 0;
|
|
|
|
/* We must not check ABSTIME here. If the thread does not block
|
|
abstime must not be checked for a valid value. */
|
|
|
|
switch (mutex->__data.__kind)
|
|
{
|
|
/* Recursive mutex. */
|
|
case PTHREAD_MUTEX_RECURSIVE_NP:
|
|
/* Check whether we already hold the mutex. */
|
|
if (mutex->__data.__owner == pd)
|
|
{
|
|
/* Just bump the counter. */
|
|
if (__builtin_expect (mutex->__data.__count + 1 == 0, 0))
|
|
/* Overflow of the counter. */
|
|
return EAGAIN;
|
|
|
|
++mutex->__data.__count;
|
|
|
|
goto out;
|
|
}
|
|
else
|
|
{
|
|
/* We have to get the mutex. */
|
|
result = lll_mutex_timedlock (mutex->__data.__lock, abstime);
|
|
|
|
if (result != 0)
|
|
goto out;
|
|
|
|
/* Only locked once so far. */
|
|
mutex->__data.__count = 1;
|
|
}
|
|
break;
|
|
|
|
/* Error checking mutex. */
|
|
case PTHREAD_MUTEX_ERRORCHECK_NP:
|
|
/* Check whether we already hold the mutex. */
|
|
if (mutex->__data.__owner == pd)
|
|
return EDEADLK;
|
|
|
|
/* FALLTHROUGH */
|
|
|
|
default:
|
|
/* Correct code cannot set any other type. */
|
|
case PTHREAD_MUTEX_TIMED_NP:
|
|
case PTHREAD_MUTEX_ADAPTIVE_NP:
|
|
/* Normal mutex. */
|
|
result = lll_mutex_timedlock (mutex->__data.__lock, abstime);
|
|
break;
|
|
}
|
|
|
|
if (result == 0)
|
|
/* Record the ownership. */
|
|
mutex->__data.__owner = pd;
|
|
|
|
out:
|
|
return result;
|
|
}
|