1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677 |
- /* Copyright (C) 2002, 2003 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;
- {
- pid_t id;
- switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP))
- {
- /* Recursive mutex. */
- case PTHREAD_MUTEX_RECURSIVE_NP:
- id = THREAD_GETMEM (THREAD_SELF, tid);
- /* Check whether we already hold the mutex. */
- if (mutex->__data.__owner == id)
- {
- /* Just bump the counter. */
- if (__builtin_expect (mutex->__data.__count + 1 == 0, 0))
- /* Overflow of the counter. */
- return EAGAIN;
- ++mutex->__data.__count;
- return 0;
- }
- if (lll_mutex_trylock (mutex->__data.__lock) == 0)
- {
- /* Record the ownership. */
- mutex->__data.__owner = id;
- mutex->__data.__count = 1;
- ++mutex->__data.__nusers;
- 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 = THREAD_GETMEM (THREAD_SELF, tid);
- ++mutex->__data.__nusers;
- return 0;
- }
- }
- return EBUSY;
- }
- strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock)
|