b6413b6db8
This basically adds makes use of the C99 restrict keyword, and also adds some 'const's to four threading functions: pthread_mutexattr_gettype(), pthread_mutexattr_getprioceiling(), pthread_mutexattr_getprotocol(), and pthread_mutex_getprioceiling. The changes are in accordance to POSIX/SUSv4-2018. Hinted by: DragonFlyBSD Relnotes: yes MFC after: 1 month Differential Revision: D16722
87 lines
2.8 KiB
Groff
87 lines
2.8 KiB
Groff
.\" Copyright (c) 1998 Alex Nash
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.\" All rights reserved.
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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 AUTHOR 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 AUTHOR 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 August 17, 2018
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.Dt PTHREAD_RWLOCKATTR_GETPSHARED 3
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.Os
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.Sh NAME
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.Nm pthread_rwlockattr_getpshared
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.Nd get the process shared attribute
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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_rwlockattr_getpshared "const pthread_rwlockattr_t *restrict attr" "int *restrict pshared"
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.Sh DESCRIPTION
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The
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.Fn pthread_rwlockattr_getpshared
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function is used to get the process shared setting of a read/write
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lock attribute object.
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The setting is returned via
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.Fa pshared ,
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and may be one of two values:
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.Bl -tag -width PTHREAD_PROCESS_PRIVATE
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.It Dv PTHREAD_PROCESS_SHARED
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Any thread of any process that has access to the memory where the
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read/write lock resides can manipulate the lock.
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.It Dv PTHREAD_PROCESS_PRIVATE
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Only threads created within the same process as the thread that
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initialized the read/write lock can manipulate the lock.
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This is
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the default value.
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.El
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.Sh RETURN VALUES
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If successful, the
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.Fn pthread_rwlockattr_getpshared
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function will return zero.
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Otherwise an error number will be returned
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to indicate the error.
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.Sh ERRORS
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The
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.Fn pthread_rwlockattr_getpshared
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function may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The value specified by
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.Fa attr
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is invalid.
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.El
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.Sh SEE ALSO
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.Xr pthread_rwlock_init 3 ,
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.Xr pthread_rwlockattr_init 3 ,
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.Xr pthread_rwlockattr_setpshared 3
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.Sh STANDARDS
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The
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.Fn pthread_rwlockattr_getpshared
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function is expected to conform to
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.St -susv2 .
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.Sh HISTORY
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The
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.Fn pthread_rwlockattr_getpshared
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function first appeared in
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.Fx 3.0 .
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