All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$FreeBSD: releng/10.3/share/man/man3/pthread_rwlock_init.3 172880 2007-10-22 10:08:01Z ru $
.Dd August 4, 1998 .Dt PTHREAD_RWLOCK_INIT 3 .Os .Sh NAME .Nm pthread_rwlock_init .Nd initialize a read/write lock .Sh LIBRARY .Lb libpthread .Sh SYNOPSIS n pthread.h .Ft int .Fn pthread_rwlock_init "pthread_rwlock_t *lock" "const pthread_rwlockattr_t *attr" .Sh DESCRIPTION The .Fn pthread_rwlock_init function is used to initialize a read/write lock, with attributes specified by .Fa attr . If .Fa attr is NULL, the default read/write lock attributes are used.
p The results of calling .Fn pthread_rwlock_init with an already initialized lock are undefined. .Sh RETURN VALUES If successful, the .Fn pthread_rwlock_init function will return zero. Otherwise an error number will be returned to indicate the error. .Sh ERRORS The .Fn pthread_rwlock_init function will fail if: l -tag -width Er t Bq Er EAGAIN The system lacked the necessary resources (other than memory) to initialize the lock. t Bq Er ENOMEM Insufficient memory exists to initialize the lock. t Bq Er EPERM The caller does not have sufficient privilege to perform the operation. .El
p The .Fn pthread_rwlock_init function may fail if: l -tag -width Er t Bq Er EBUSY The system has detected an attempt to re-initialize the object referenced by .Fa lock , a previously initialized but not yet destroyed read/write lock. t Bq Er EINVAL The value specified by .Fa attr is invalid. .El .Sh SEE ALSO .Xr pthread_rwlockattr_init 3 , .Xr pthread_rwlockattr_setpshared 3 , .Xr pthread_rwlock_destroy 3 .Sh STANDARDS The .Fn pthread_rwlock_init function is expected to conform to .St -susv2 . .Sh HISTORY The .Fn pthread_rwlock_init function first appeared in .Fx 3.0 . .Sh BUGS The PTHREAD_PROCESS_SHARED attribute is not supported.