Section: POSIX Programmer's Manual (3P)
This 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.
--- get and set the mutex type attribute
int pthread_mutexattr_gettype(const pthread_mutexattr_t *restrict attr,
int *restrict type);
int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type);
functions, respectively, shall get and set the mutex
attribute. This attribute is set in the
parameter to these functions. The default value of the
attribute is PTHREAD_MUTEX_DEFAULT.
The type of mutex is contained in the
attribute of the mutex attributes. Valid mutex types include:
The mutex type affects the behavior of calls which lock and unlock the
for details. An implementation may map PTHREAD_MUTEX_DEFAULT to one of
the other mutex types.
The behavior is undefined if the value specified by the
does not refer to an initialized mutex attributes object.
Upon successful completion, the
function shall return zero and store the value of the
into the object referenced by the
parameter. Otherwise, an error shall be returned to indicate the error.
If successful, the
function shall return zero; otherwise, an error number shall be
returned to indicate the error.
function shall fail if:
These functions shall not return an error code of
The following sections are informative.
It is advised that an application should not use a
PTHREAD_MUTEX_RECURSIVE mutex with condition variables
because the implicit unlock performed for a
may not actually release the mutex (if it had been locked multiple
times). If this happens, no other thread can satisfy the condition of
If an implementation detects that the value specified by the
does not refer to an initialized mutex attributes object, it is
recommended that the function should fail and report an
The Base Definitions volume of POSIX.1-2008,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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
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