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Diffstat (limited to 'pthreads/pthread_condattr_setpshared.c')
| -rw-r--r-- | pthreads/pthread_condattr_setpshared.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/pthreads/pthread_condattr_setpshared.c b/pthreads/pthread_condattr_setpshared.c new file mode 100644 index 000000000..954fb3829 --- /dev/null +++ b/pthreads/pthread_condattr_setpshared.c @@ -0,0 +1,117 @@ +/* + * pthread_condattr_setpshared.c + * + * Description: + * This translation unit implements condition variables and their 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 "pthread.h" +#include "implement.h" + + +int +pthread_condattr_setpshared (pthread_condattr_t * attr, int pshared) + /* + * ------------------------------------------------------ + * DOCPUBLIC + * Mutexes created with 'attr' can be shared between + * processes if pthread_mutex_t variable is allocated + * in memory shared by these processes. + * + * PARAMETERS + * attr + * pointer to an instance of pthread_mutexattr_t + * + * pshared + * must be 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 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_condattr_setpshared */ |