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intention of the POSIX IEEE Std 1003.1TM-2008/Cor 1-2013. A robust mutex is guaranteed to be cleared by the system upon either thread or process owner termination while the mutex is held. The next mutex locker is then notified about inconsistent mutex state and can execute (or abandon) corrective actions. The patch mostly consists of small changes here and there, adding neccessary checks for the inconsistent and abandoned conditions into existing paths. Additionally, the thread exit handler was extended to iterate over the userspace-maintained list of owned robust mutexes, unlocking and marking as terminated each of them. The list of owned robust mutexes cannot be maintained atomically synchronous with the mutex lock state (it is possible in kernel, but is too expensive). Instead, for the duration of lock or unlock operation, the current mutex is remembered in a special slot that is also checked by the kernel at thread termination. Kernel must be aware about the per-thread location of the heads of robust mutex lists and the current active mutex slot. When a thread touches a robust mutex for the first time, a new umtx op syscall is issued which informs about location of lists heads. The umtx sleep queues for PP and PI mutexes are split between non-robust and robust. Somewhat unrelated changes in the patch: 1. Style. 2. The fix for proper tdfind() call use in umtxq_sleep_pi() for shared pi mutexes. 3. Removal of the userspace struct pthread_mutex m_owner field. 4. The sysctl kern.ipc.umtx_vnode_persistent is added, which controls the lifetime of the shared mutex associated with a vnode' page. Reviewed by: jilles (previous version, supposedly the objection was fixed) Discussed with: brooks, Martin Simmons <martin@lispworks.com> (some aspects) Tested by: pho Sponsored by: The FreeBSD Foundation
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 May 8, 2016
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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_mutexattr_setrobust 3 ,
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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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.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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