1 /* pthread_mutex_consistent. Hurd version. 2 Copyright (C) 2016-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 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. 9 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. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <pthread.h> 20 #include <stdlib.h> 21 #include <assert.h> 22 #include <pt-internal.h> 23 #include "pt-mutex.h" 24 #include <hurdlock.h> 25 26 int pthread_mutex_consistent(pthread_mutex_t * mtxp)27pthread_mutex_consistent (pthread_mutex_t *mtxp) 28 { 29 int ret = EINVAL; 30 unsigned int val = mtxp->__lock; 31 32 if ((mtxp->__flags & PTHREAD_MUTEX_ROBUST) != 0 33 && (val & LLL_DEAD_OWNER) != 0 34 && atomic_compare_and_exchange_bool_acq (&mtxp->__lock, 35 __getpid () | LLL_WAITERS, 36 val) == 0) 37 { 38 /* The mutex is now ours, and it's consistent. */ 39 mtxp->__owner_id = _pthread_self ()->thread; 40 mtxp->__cnt = 1; 41 ret = 0; 42 } 43 44 return ret; 45 } 46 47 weak_alias (pthread_mutex_consistent, pthread_mutex_consistent_np) 48