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/* Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003. 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, see <http://www.gnu.org/licenses/>. */ #include <endian.h> #include <errno.h> #include <sysdep.h> #include <lowlevellock.h> #include <pthread.h> #include <pthreadP.h> #include <bits/kernel-features.h> int attribute_protected __pthread_cond_signal ( pthread_cond_t *cond) { int pshared = (cond->__data.__mutex == (void *) ~0l) ? LLL_SHARED : LLL_PRIVATE; /* Make sure we are alone. */ lll_lock (cond->__data.__lock, pshared); /* Are there any waiters to be woken? */ if (cond->__data.__total_seq > cond->__data.__wakeup_seq) { /* Yes. Mark one of them as woken. */ ++cond->__data.__wakeup_seq; ++cond->__data.__futex; /* Wake one. */ if (! __builtin_expect (lll_futex_wake_unlock (&cond->__data.__futex, 1, 1, &cond->__data.__lock, pshared), 0)) return 0; lll_futex_wake (&cond->__data.__futex, 1, pshared); } /* We are done. */ lll_unlock (cond->__data.__lock, pshared); return 0; } weak_alias(__pthread_cond_signal, pthread_cond_signal) |