/* 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 (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)