1 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 #include <lowlevellock.h>
26 __pthread_mutex_trylock (mutex)
27 pthread_mutex_t *mutex;
31 switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP))
33 /* Recursive mutex. */
34 case PTHREAD_MUTEX_RECURSIVE_NP:
35 id = THREAD_GETMEM (THREAD_SELF, tid);
36 /* Check whether we already hold the mutex. */
37 if (mutex->__data.__owner == id)
39 /* Just bump the counter. */
40 if (__builtin_expect (mutex->__data.__count + 1 == 0, 0))
41 /* Overflow of the counter. */
44 ++mutex->__data.__count;
48 if (lll_mutex_trylock (mutex->__data.__lock) == 0)
50 /* Record the ownership. */
51 mutex->__data.__owner = id;
52 mutex->__data.__count = 1;
53 ++mutex->__data.__nusers;
58 case PTHREAD_MUTEX_ERRORCHECK_NP:
59 /* Error checking mutex. We do not check for deadlocks. */
61 /* Correct code cannot set any other type. */
62 case PTHREAD_MUTEX_TIMED_NP:
63 case PTHREAD_MUTEX_ADAPTIVE_NP:
65 if (lll_mutex_trylock (mutex->__data.__lock) == 0)
67 /* Record the ownership. */
68 mutex->__data.__owner = THREAD_GETMEM (THREAD_SELF, tid);
69 ++mutex->__data.__nusers;
77 strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock)