/* * pthread_rwlockattr_setpshared.c * * Description: * This translation unit implements read/write lock primitives. * * -------------------------------------------------------------------------- * *      Pthreads-win32 - POSIX Threads Library for Win32 *      Copyright(C) 1998 John E. Bossom *      Copyright(C) 1999,2005 Pthreads-win32 contributors *  *      Contact Email: rpj@callisto.canberra.edu.au *  *      The current list of contributors is contained *      in the file CONTRIBUTORS included with the source *      code distribution. The list can also be seen at the *      following World Wide Web location: *      http://sources.redhat.com/pthreads-win32/contributors.html *  *      This 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 of the License, or (at your option) any later version. *  *      This 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 this library in the file COPYING.LIB; *      if not, write to the Free Software Foundation, Inc., *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */#include <errno.h>#include <limits.h>#include "pthread.h"#include "implement.h"intpthread_rwlockattr_setpshared (pthread_rwlockattr_t * attr, int pshared)     /*      * ------------------------------------------------------      * DOCPUBLIC      *      Rwlocks created with 'attr' can be shared between      *      processes if pthread_rwlock_t variable is allocated      *      in memory shared by these processes.      *      * PARAMETERS      *      attr      *              pointer to an instance of pthread_rwlockattr_t      *      *      pshared      *              must be one of:      *      *                      PTHREAD_PROCESS_SHARED      *                              May be shared if in shared memory      *      *                      PTHREAD_PROCESS_PRIVATE      *                              Cannot be shared.      *      * DESCRIPTION      *      Rwlocks creatd with 'attr' can be shared between      *      processes if pthread_rwlock_t variable is allocated      *      in memory shared by these processes.      *      *      NOTES:      *              1)      pshared rwlocks MUST be allocated in shared      *                      memory.      *      *              2)      The following macro is defined if shared rwlocks      *                      are supported:      *                              _POSIX_THREAD_PROCESS_SHARED      *      * RESULTS      *              0               successfully set attribute,      *              EINVAL          'attr' or pshared is invalid,      *              ENOSYS          PTHREAD_PROCESS_SHARED not supported,      *      * ------------------------------------------------------      */{  int result;  if ((attr != NULL && *attr != NULL) &&      ((pshared == PTHREAD_PROCESS_SHARED) ||       (pshared == PTHREAD_PROCESS_PRIVATE)))    {      if (pshared == PTHREAD_PROCESS_SHARED)	{#if !defined( _POSIX_THREAD_PROCESS_SHARED )	  result = ENOSYS;	  pshared = PTHREAD_PROCESS_PRIVATE;#else	  result = 0;#endif /* _POSIX_THREAD_PROCESS_SHARED */	}      else	{	  result = 0;	}      (*attr)->pshared = pshared;    }  else    {      result = EINVAL;    }  return (result);}				/* pthread_rwlockattr_setpshared */