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/* Transfer ownership of a mutex. Generic version.
Copyright (C) 2008-2020 Free Software Foundation, Inc.
Written by Neal H. Walfield <neal@gnu.org>.
This file is part of the GNU Hurd.
The GNU Hurd 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 3 of
the License, or (at your option) any later version.
The GNU Hurd 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 this program. If not, see
<https://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <assert.h>
#include <pt-internal.h>
int
__pthread_mutex_transfer_np (struct __pthread_mutex *mutex, pthread_t tid)
{
assert (mutex->__owner == _pthread_self ());
struct __pthread *thread = __pthread_getid (tid);
const struct __pthread_mutexattr *attr = mutex->__attr;
if (thread == NULL)
return ESRCH;
if (thread == _pthread_self ())
return 0;
if (attr == __PTHREAD_ERRORCHECK_MUTEXATTR)
attr = &__pthread_errorcheck_mutexattr;
if (attr == __PTHREAD_RECURSIVE_MUTEXATTR)
attr = &__pthread_recursive_mutexattr;
if (attr != NULL && attr->__mutex_type == PTHREAD_MUTEX_ERRORCHECK)
{
if (mutex->__owner != _pthread_self ())
return EPERM;
mutex->__owner = thread;
}
#ifndef NDEBUG
# if !defined(ALWAYS_TRACK_MUTEX_OWNER)
if (attr != NULL && attr->__mutex_type != PTHREAD_MUTEX_NORMAL)
# endif
{
mutex->__owner = thread;
}
#endif
return 0;
}
strong_alias (__pthread_mutex_transfer_np, pthread_mutex_transfer_np)
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