120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
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/*
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* pthread_mutexattr_setpshared.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_setpshared (pthread_mutexattr_t * attr, int pshared)
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/*
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* ------------------------------------------------------
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* DOCPUBLIC
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* Mutexes created with 'attr' can be shared between
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* processes if pthread_mutex_t variable is allocated
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* in memory shared by these processes.
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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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* pshared
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* must be one of:
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*
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* PTHREAD_PROCESS_SHARED
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* May be shared if in shared memory
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*
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* PTHREAD_PROCESS_PRIVATE
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* Cannot be shared.
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*
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* DESCRIPTION
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* Mutexes creatd with 'attr' can be shared between
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* processes if pthread_mutex_t variable is allocated
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* in memory shared by these processes.
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*
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* NOTES:
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* 1) pshared mutexes MUST be allocated in shared
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* memory.
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*
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* 2) The following macro is defined if shared mutexes
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* are supported:
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* _POSIX_THREAD_PROCESS_SHARED
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*
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* RESULTS
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* 0 successfully set attribute,
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* EINVAL 'attr' or pshared is invalid,
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* ENOSYS PTHREAD_PROCESS_SHARED not supported,
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*
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* ------------------------------------------------------
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*/
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{
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int result;
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if ((attr != NULL && *attr != NULL) &&
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((pshared == PTHREAD_PROCESS_SHARED) ||
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(pshared == PTHREAD_PROCESS_PRIVATE)))
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{
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if (pshared == PTHREAD_PROCESS_SHARED)
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{
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#if !defined( _POSIX_THREAD_PROCESS_SHARED )
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result = ENOSYS;
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pshared = PTHREAD_PROCESS_PRIVATE;
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#else
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result = 0;
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#endif /* _POSIX_THREAD_PROCESS_SHARED */
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}
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else
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{
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result = 0;
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}
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(*attr)->pshared = pshared;
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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_setpshared */
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