diff options
Diffstat (limited to 'pthread_mutexattr_getpshared.c')
-rw-r--r-- | pthread_mutexattr_getpshared.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/pthread_mutexattr_getpshared.c b/pthread_mutexattr_getpshared.c new file mode 100644 index 0000000..8a5c50b --- /dev/null +++ b/pthread_mutexattr_getpshared.c @@ -0,0 +1,97 @@ +/* + * pthread_mutexattr_getpshared.c + * + * Description: + * This translation unit implements mutual exclusion (mutex) primitives. + * + * -------------------------------------------------------------------------- + * + * Pthreads-win32 - POSIX Threads Library for Win32 + * Copyright(C) 1998 John E. Bossom + * Copyright(C) 1999,2002 Pthreads-win32 contributors + * + * Contact Email: rpj@ise.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 "pthread.h" +#include "implement.h" + + +int +pthread_mutexattr_getpshared (const pthread_mutexattr_t * attr, + int *pshared) + /* + * ------------------------------------------------------ + * DOCPUBLIC + * Determine whether mutexes created with 'attr' can be + * shared between processes. + * + * PARAMETERS + * attr + * pointer to an instance of pthread_mutexattr_t + * + * pshared + * will be set to one of: + * + * PTHREAD_PROCESS_SHARED + * May be shared if in shared memory + * + * PTHREAD_PROCESS_PRIVATE + * Cannot be shared. + * + * + * DESCRIPTION + * Mutexes creatd with 'attr' can be shared between + * processes if pthread_mutex_t variable is allocated + * in memory shared by these processes. + * NOTES: + * 1) pshared mutexes MUST be allocated in shared + * memory. + * 2) The following macro is defined if shared mutexes + * are supported: + * _POSIX_THREAD_PROCESS_SHARED + * + * RESULTS + * 0 successfully retrieved attribute, + * EINVAL 'attr' is invalid, + * + * ------------------------------------------------------ + */ +{ + int result; + + if ((attr != NULL && *attr != NULL) && + (pshared != NULL)) + { + *pshared = (*attr)->pshared; + result = 0; + } + else + { + result = EINVAL; + } + + return (result); + +} /* pthread_mutexattr_getpshared */ |