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.TH PTHREAD_MUTEX_CONSISTENT 3 2017-08-20 "Linux" "Linux Programmer's Manual"
.SH NAME
pthread_mutex_consistent \- make a robust mutex consistent
.SH SYNOPSIS
.nf
.B #include <pthread.h>
.PP
.BI "int pthread_mutex_consistent(pthread_mutex_t *" mutex ");"
.fi
.PP
Compile and link with \fI\-pthread\fP.
.PP
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.PP
.BR pthread_mutex_consistent ():
.br
.RS 4
.ad l
_POSIX_C_SOURCE >= 200809L
.RE
.ad
.SH DESCRIPTION
This function makes a robust mutex consistent if it is in a inconsistent
state.
A mutex can be left in a inconsistent state if its owner terminates
while holding the mutex, in which case the next owner who acquires the
mutex will succeed and be notified by the return value of
.BR EOWNERDEAD .
.SH RETURN VALUE
On success,
.IR pthread_mutex_consistent()
returns 0.
Otherwise, an error value is returned to indicate the error.
.SH ERRORS
.TP
.B EINVAL
The mutex is either not robust or it is not in a inconsistent state.
.SH VERSIONS
.BR pthread_mutex_consistent ()
was added to glibc in version 2.12.
.SH CONFORMING TO
POSIX.1-2008.
.SH NOTES
Before the addition of
.BR pthread_mutex_consistent ()
to POSIX,
glibc defined the following equivalent nonstandard function if
.BR _GNU_SOURCE
was defined:
.PP
.nf
.BI "int pthread_mutex_consistent(const pthread_mutex_t *" mutex );
.fi
.PP
This GNU-specific API, which first appeared in glibc 2.4,
is nowadays obsolete and should not be used in new programs.
.SH SEE ALSO
.ad l
.nh
.BR pthread_mutexattr_init (3),
.BR pthread_mutex_lock (3),
.BR pthread_mutexattr_setrobust (3),
.BR pthread_mutexattr_getrobust (3),
.BR pthreads (7)