mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-01 17:30:07 +00:00
71 lines
2.0 KiB
C
71 lines
2.0 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_trylock (mutex)
|
||
|
|
pthread_mutex_t *mutex;
|
||
|
|
{
|
||
|
|
struct pthread *pd = THREAD_SELF;
|
||
|
|
|
||
|
|
switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP))
|
||
|
|
{
|
||
|
|
/* Recursive mutex. */
|
||
|
|
case PTHREAD_MUTEX_RECURSIVE_NP:
|
||
|
|
/* Check whether we already hold the mutex. */
|
||
|
|
if (mutex->__data.__owner == pd)
|
||
|
|
{
|
||
|
|
/* Just bump the counter. */
|
||
|
|
++mutex->__data.__count;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (lll_mutex_trylock (mutex->__data.__lock) == 0)
|
||
|
|
{
|
||
|
|
/* Record the ownership. */
|
||
|
|
mutex->__data.__owner = pd;
|
||
|
|
mutex->__data.__count = 1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case PTHREAD_MUTEX_ERRORCHECK_NP:
|
||
|
|
/* Error checking mutex. We do not check for deadlocks. */
|
||
|
|
default:
|
||
|
|
/* Correct code cannot set any other type. */
|
||
|
|
case PTHREAD_MUTEX_TIMED_NP:
|
||
|
|
case PTHREAD_MUTEX_ADAPTIVE_NP:
|
||
|
|
/* Normal mutex. */
|
||
|
|
if (lll_mutex_trylock (mutex->__data.__lock) == 0)
|
||
|
|
{
|
||
|
|
/* Record the ownership. */
|
||
|
|
mutex->__data.__owner = pd;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return EBUSY;
|
||
|
|
}
|
||
|
|
strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock)
|