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Diffstat (limited to 'pthreads/src/pthread_mutexattr_settype.c')
| -rw-r--r-- | pthreads/src/pthread_mutexattr_settype.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/pthreads/src/pthread_mutexattr_settype.c b/pthreads/src/pthread_mutexattr_settype.c new file mode 100644 index 0000000..8365daf --- /dev/null +++ b/pthreads/src/pthread_mutexattr_settype.c @@ -0,0 +1,143 @@ +/* + * pthread_mutexattr_settype.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) 1999,2005 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_mutexattr_settype (pthread_mutexattr_t * attr, int kind) + /* + * ------------------------------------------------------ + * + * DOCPUBLIC + * The pthread_mutexattr_settype() and + * pthread_mutexattr_gettype() functions respectively set and + * get the mutex type attribute. This attribute is set in the + * type parameter to these functions. + * + * PARAMETERS + * attr + * pointer to an instance of pthread_mutexattr_t + * + * type + * must be one of: + * + * PTHREAD_MUTEX_DEFAULT + * + * PTHREAD_MUTEX_NORMAL + * + * PTHREAD_MUTEX_ERRORCHECK + * + * PTHREAD_MUTEX_RECURSIVE + * + * DESCRIPTION + * The pthread_mutexattr_settype() and + * pthread_mutexattr_gettype() functions respectively set and + * get the mutex type attribute. This attribute is set in the + * type parameter to these functions. The default value of the + * type attribute is PTHREAD_MUTEX_DEFAULT. + * + * The type of mutex is contained in the type attribute of the + * mutex attributes. Valid mutex types include: + * + * PTHREAD_MUTEX_NORMAL + * This type of mutex does not detect deadlock. A + * thread attempting to relock this mutex without + * first unlocking it will deadlock. Attempting to + * unlock a mutex locked by a different thread + * results in undefined behavior. Attempting to + * unlock an unlocked mutex results in undefined + * behavior. + * + * PTHREAD_MUTEX_ERRORCHECK + * This type of mutex provides error checking. A + * thread attempting to relock this mutex without + * first unlocking it will return with an error. A + * thread attempting to unlock a mutex which another + * thread has locked will return with an error. A + * thread attempting to unlock an unlocked mutex will + * return with an error. + * + * PTHREAD_MUTEX_DEFAULT + * Same as PTHREAD_MUTEX_NORMAL. + * + * PTHREAD_MUTEX_RECURSIVE + * A thread attempting to relock this mutex without + * first unlocking it will succeed in locking the + * mutex. The relocking deadlock which can occur with + * mutexes of type PTHREAD_MUTEX_NORMAL cannot occur + * with this type of mutex. Multiple locks of this + * mutex require the same number of unlocks to + * release the mutex before another thread can + * acquire the mutex. A thread attempting to unlock a + * mutex which another thread has locked will return + * with an error. A thread attempting to unlock an + * unlocked mutex will return with an error. This + * type of mutex is only supported for mutexes whose + * process shared attribute is + * PTHREAD_PROCESS_PRIVATE. + * + * RESULTS + * 0 successfully set attribute, + * EINVAL 'attr' or 'type' is invalid, + * + * ------------------------------------------------------ + */ +{ + int result = 0; + + if ((attr != NULL && *attr != NULL)) + { + switch (kind) + { + case PTHREAD_MUTEX_FAST_NP: + case PTHREAD_MUTEX_RECURSIVE_NP: + case PTHREAD_MUTEX_ERRORCHECK_NP: + (*attr)->kind = kind; + break; + default: + result = EINVAL; + break; + } + } + else + { + result = EINVAL; + } + + return (result); +} /* pthread_mutexattr_settype */ |