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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PTHREAD..._GETTYPE(3P) POSIX Programmer's Manual PTHREAD..._GETTYPE(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.
pthread_mutexattr_gettype, pthread_mutexattr_settype — get and
set the mutex type attribute
#include <pthread.h>
int pthread_mutexattr_gettype(const pthread_mutexattr_t *restrict attr,
int *restrict type);
int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type);
The 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:
PTHREAD_MUTEX_NORMAL PTHREAD_MUTEX_ERRORCHECK
PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_DEFAULT
The mutex type affects the behavior of calls which lock and
unlock the mutex. See pthread_mutex_lock(3p) 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 attr
argument to pthread_mutexattr_gettype() or
pthread_mutexattr_settype() does not refer to an initialized
mutex attributes object.
Upon 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.
The pthread_mutexattr_settype() function shall fail if:
EINVAL The value type is invalid.
These functions shall not return an error code of [EINTR].
The following sections are informative.
None.
It 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.
If an implementation detects that the value specified by the attr
argument to pthread_mutexattr_gettype() or
pthread_mutexattr_settype() does not refer to an initialized
mutex attributes object, it is recommended that the function
should fail and report an [EINVAL] error.
None.
pthread_cond_timedwait(3p), pthread_mutex_lock(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 PTHREAD..._GETTYPE(3P)
Pages that refer to this page: pthread.h(0p), pthread_mutexattr_settype(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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