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8421051831
Closes jp9000/obs-studio#453
144 lines
5.3 KiB
C
144 lines
5.3 KiB
C
/*
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* pthread_mutexattr_settype.c
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*
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* Description:
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* This translation unit implements mutual exclusion (mutex) primitives.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_mutexattr_settype (pthread_mutexattr_t * attr, int kind)
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/*
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* ------------------------------------------------------
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*
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* DOCPUBLIC
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* The pthread_mutexattr_settype() and
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* pthread_mutexattr_gettype() functions respectively set and
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* get the mutex type attribute. This attribute is set in the
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* type parameter to these functions.
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*
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* PARAMETERS
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* attr
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* pointer to an instance of pthread_mutexattr_t
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*
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* type
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* must be one of:
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*
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* PTHREAD_MUTEX_DEFAULT
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*
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* PTHREAD_MUTEX_NORMAL
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*
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* PTHREAD_MUTEX_ERRORCHECK
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*
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* PTHREAD_MUTEX_RECURSIVE
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*
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* DESCRIPTION
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* The pthread_mutexattr_settype() and
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* pthread_mutexattr_gettype() functions respectively set and
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* get the mutex type attribute. This attribute is set in the
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* type parameter to these functions. The default value of the
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* type attribute is PTHREAD_MUTEX_DEFAULT.
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*
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* The type of mutex is contained in the type attribute of the
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* mutex attributes. Valid mutex types include:
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*
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* PTHREAD_MUTEX_NORMAL
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* This type of mutex does not detect deadlock. A
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* thread attempting to relock this mutex without
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* first unlocking it will deadlock. Attempting to
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* unlock a mutex locked by a different thread
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* results in undefined behavior. Attempting to
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* unlock an unlocked mutex results in undefined
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* behavior.
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*
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* PTHREAD_MUTEX_ERRORCHECK
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* This type of mutex provides error checking. A
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* thread attempting to relock this mutex without
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* first unlocking it will return with an error. A
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* thread attempting to unlock a mutex which another
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* thread has locked will return with an error. A
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* thread attempting to unlock an unlocked mutex will
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* return with an error.
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*
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* PTHREAD_MUTEX_DEFAULT
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* Same as PTHREAD_MUTEX_NORMAL.
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*
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* PTHREAD_MUTEX_RECURSIVE
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* A thread attempting to relock this mutex without
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* first unlocking it will succeed in locking the
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* mutex. The relocking deadlock which can occur with
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* mutexes of type PTHREAD_MUTEX_NORMAL cannot occur
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* with this type of mutex. Multiple locks of this
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* mutex require the same number of unlocks to
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* release the mutex before another thread can
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* acquire the mutex. A thread attempting to unlock a
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* mutex which another thread has locked will return
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* with an error. A thread attempting to unlock an
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* unlocked mutex will return with an error. This
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* type of mutex is only supported for mutexes whose
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* process shared attribute is
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* PTHREAD_PROCESS_PRIVATE.
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*
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* RESULTS
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* 0 successfully set attribute,
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* EINVAL 'attr' or 'type' is invalid,
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*
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* ------------------------------------------------------
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*/
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{
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int result = 0;
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if ((attr != NULL && *attr != NULL))
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{
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switch (kind)
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{
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case PTHREAD_MUTEX_FAST_NP:
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case PTHREAD_MUTEX_RECURSIVE_NP:
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case PTHREAD_MUTEX_ERRORCHECK_NP:
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(*attr)->kind = kind;
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break;
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default:
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result = EINVAL;
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break;
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}
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}
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else
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{
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result = EINVAL;
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}
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return (result);
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} /* pthread_mutexattr_settype */
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