PTHREAD_MUTEX_CONSISTENT(3PPOSIX Programmer's ManuPTHREAD_MUTEX_CONSISTENT(3P)PROLOG
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.
NAMEpthread_mutex_consistent — mark state protected by robust mutex as con‐
int pthread_mutex_consistent(pthread_mutex_t *mutex);
If mutex is a robust mutex in an inconsistent state, the
pthread_mutex_consistent() function can be used to mark the state pro‐
tected by the mutex referenced by mutex as consistent again.
If an owner of a robust mutex terminates while holding the mutex, the
mutex becomes inconsistent and the next thread that acquires the mutex
lock shall be notified of the state by the return value [EOWNERDEAD].
In this case, the mutex does not become normally usable again until the
state is marked consistent.
If the thread which acquired the mutex lock with the return value
[EOWNERDEAD] terminates before calling either pthread_mutex_consis‐
tent() or pthread_mutex_unlock(), the next thread that acquires the
mutex lock shall be notified about the state of the mutex by the return
The behavior is undefined if the value specified by the mutex argument
to pthread_mutex_consistent() does not refer to an initialized mutex.
Upon successful completion, the pthread_mutex_consistent() function
shall return zero. Otherwise, an error value shall be returned to indi‐
cate the error.
The pthread_mutex_consistent() function shall fail if:
EINVAL The mutex object referenced by mutex is not robust or does not
protect an inconsistent state.
These functions shall not return an error code of [EINTR].
The following sections are informative.
The pthread_mutex_consistent() function is only responsible for notify‐
ing the implementation that the state protected by the mutex has been
recovered and that normal operations with the mutex can be resumed. It
is the responsibility of the application to recover the state so it can
be reused. If the application is not able to perform the recovery, it
can notify the implementation that the situation is unrecoverable by a
call to pthread_mutex_unlock() without a prior call to
pthread_mutex_consistent(), in which case subsequent threads that
attempt to lock the mutex will fail to acquire the lock and be returned
If an implementation detects that the value specified by the mutex
argument to pthread_mutex_consistent() does not refer to an initialized
mutex, it is recommended that the function should fail and report an
SEE ALSOpthread_mutex_lock(), pthread_mutexattr_getrobust()
The Base Definitions volume of POSIX.1‐2008, <pthread.h>
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 Electri‐
cal 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 http://www.unix.org/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.ker‐
IEEE/The Open Group 2013 PTHREAD_MUTEX_CONSISTENT(3P)