|PTHREAD_MUTEXATTR_GETTYPE(3P)||POSIX Programmer's Manual||PTHREAD_MUTEXATTR_GETTYPE(3P)|
PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAMEpthread_mutexattr_gettype, pthread_mutexattr_settype - get and set the mutex type attribute
DESCRIPTIONThe pthread_mutexattr_gettype() and pthread_mutexattr_settype() functions, respectively, shall get and set 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:
RETURN VALUEUpon successful completion, the pthread_mutexattr_gettype() function shall return zero and store the value of the type attribute of attr into the object referenced by the type parameter. Otherwise, an error shall be returned to indicate the error.
If successful, the pthread_mutexattr_settype() function shall return zero; otherwise, an error number shall be returned to indicate the error.
ERRORSThe pthread_mutexattr_settype() function shall fail if:
type is invalid.
The pthread_mutexattr_gettype() and pthread_mutexattr_settype() functions may fail if:
The value specified by
attr is invalid.
These functions shall not return an error code of [EINTR].
The following sections are informative.
APPLICATION USAGEIt is advised that an application should not use a PTHREAD_MUTEX_RECURSIVE mutex with condition variables because the implicit unlock performed for a pthread_cond_timedwait() or pthread_cond_wait() may not actually release the mutex (if it had been locked multiple times). If this happens, no other thread can satisfy the condition of the predicate.
SEE ALSOpthread_cond_timedwait(), the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>
COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
|2003||IEEE/The Open Group|