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 (pthread_mutex_t *mutex)
30 switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP))
32 /* Recursive mutex. */
33 case PTHREAD_MUTEX_RECURSIVE_NP:
34 id = THREAD_GETMEM (THREAD_SELF, tid);
35 /* Check whether we already hold the mutex. */
36 if (mutex->__data.__owner == id)
38 /* Just bump the counter. */
39 if (__builtin_expect (mutex->__data.__count + 1 == 0, 0))
40 /* Overflow of the counter. */
43 ++mutex->__data.__count;
47 if (lll_mutex_trylock (mutex->__data.__lock) == 0)
49 /* Record the ownership. */
50 mutex->__data.__owner = id;
51 mutex->__data.__count = 1;
52 ++mutex->__data.__nusers;
57 case PTHREAD_MUTEX_ERRORCHECK_NP:
58 /* Error checking mutex. We do not check for deadlocks. */
60 /* Correct code cannot set any other type. */
61 case PTHREAD_MUTEX_TIMED_NP:
62 case PTHREAD_MUTEX_ADAPTIVE_NP:
64 if (lll_mutex_trylock (mutex->__data.__lock) == 0)
66 /* Record the ownership. */
67 mutex->__data.__owner = THREAD_GETMEM (THREAD_SELF, tid);
68 ++mutex->__data.__nusers;
76 strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock)