95 lines
3.2 KiB
Groff
95 lines
3.2 KiB
Groff
.\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This documentation was written by
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.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
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.\" from the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 27, 2017
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.Dt PTHREAD_MUTEX_CONSISTENT 3
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.Os
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.Sh NAME
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.Nm pthread_mutex_consistent
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.Nd mark state protected by robust mutex as consistent
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.Sh LIBRARY
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.Lb libpthread
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.Sh SYNOPSIS
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.In pthread.h
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.Ft int
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.Fn pthread_mutex_consistent "pthread_mutex_t *mutex"
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.Sh DESCRIPTION
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If the thread owning a robust mutex terminates while holding the
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mutex, the mutex becomes inconsistent and the next thread that
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acquires the mutex lock is notified of the state by the return value
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.Er EOWNERDEAD .
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In this case, the mutex does not become normally usable again until
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the state is marked consistent.
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.Pp
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The
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.Fn pthread_mutex_consistent ,
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when called with the
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.Fa mutex
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argument, which points to the initialized robust mutex in an
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inconsistent state, marks the by mutex as consistent again.
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The consequent unlock of the mutex, by either
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.Fn pthread_mutex_unlock
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or other methods, allows other contenders to lock the mutex.
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.Pp
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If the mutex in the inconsistent state is not marked consistent
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by the call to
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.Fn pthread_mutex_consistent
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before unlock,
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further attempts to lock the
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.Fa mutex
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result in the
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.Er ENOTRECOVERABLE
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condition reported by the locking functions.
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.Sh RETURN VALUES
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If successful,
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.Fn pthread_mutex_consistent
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will return zero, otherwise an error number will be returned to
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indicate the error.
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.Sh ERRORS
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The
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.Fn pthread_mutex_lock
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The mutex pointed to by the
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.Fa mutex
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argument is not robust, or is not in the inconsistent state.
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.El
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.Sh SEE ALSO
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.Xr pthread_mutex_init 3 ,
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.Xr pthread_mutex_lock 3 ,
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.Xr pthread_mutex_unlock 3 ,
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.Xr pthread_mutexattr_setrobust 3
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.Sh STANDARDS
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The
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.Fn pthread_mutex_lock
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function conforms to
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.St -susv4 .
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