diff options
Diffstat (limited to 'sysdeps/mach/hurd/htl/pt-mutex-consistent.c')
-rw-r--r-- | sysdeps/mach/hurd/htl/pt-mutex-consistent.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/htl/pt-mutex-consistent.c b/sysdeps/mach/hurd/htl/pt-mutex-consistent.c new file mode 100644 index 0000000000..e02f959a57 --- /dev/null +++ b/sysdeps/mach/hurd/htl/pt-mutex-consistent.c @@ -0,0 +1,47 @@ +/* pthread_mutex_consistent. Hurd version. + Copyright (C) 2016-2018 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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 <pthread.h> +#include <stdlib.h> +#include <assert.h> +#include <pt-internal.h> +#include "pt-mutex.h" +#include <hurdlock.h> + +int +pthread_mutex_consistent (pthread_mutex_t *mtxp) +{ + int ret = EINVAL; + unsigned int val = mtxp->__lock; + + if ((mtxp->__flags & PTHREAD_MUTEX_ROBUST) != 0 && + (val & LLL_DEAD_OWNER) != 0 && + atomic_compare_and_exchange_bool_acq (&mtxp->__lock, + __getpid () | LLL_WAITERS, + val) == 0) + { + /* The mutex is now ours, and it's consistent. */ + mtxp->__owner_id = _pthread_self ()->thread; + mtxp->__cnt = 1; + ret = 0; + } + + return ret; +} + +weak_alias (pthread_mutex_consistent, pthread_mutex_consistent_np) |