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.\"
.TH PTHREAD_RWLOCKATTR_INIT 3C "Mar 23, 2005"
.SH NAME
pthread_rwlockattr_init, pthread_rwlockattr_destroy \- initialize or destroy
read-write lock attributes object
.SH SYNOPSIS
.LP
.nf
cc -mt [ \fIflag\fR... ] \fIfile\fR... -lpthread [ \fIlibrary\fR... ]
#include <pthread.h>
\fBint\fR \fBpthread_rwlockattr_init\fR(\fBpthread_rwlockattr_t\fR \fI*attr\fR);
.fi
.LP
.nf
\fBint\fR \fBpthread_rwlockattr_destroy\fR(\fBpthread_rwlockattr_t\fR \fI*attr\fR);
.fi
.SH DESCRIPTION
.sp
.LP
The \fBpthread_rwlockattr_init()\fR function initializes a read-write lock
attributes object \fIattr\fR with the default value for all of the attributes
defined by the implementation.
.sp
.LP
Results are undefined if \fBpthread_rwlockattr_init()\fR is called specifying
an already initialized read-write lock attributes object.
.sp
.LP
After a read-write lock attributes object has been used to initialize one or
more read-write locks, any function affecting the attributes object (including
destruction) does not affect any previously initialized read-write locks.
.sp
.LP
The \fBpthread_rwlockattr_destroy()\fR function destroys a read-write lock
attributes object. The effect of subsequent use of the object is undefined
until the object is re-initialized by another call to
\fBpthread_rwlockattr_init()\fR. An implementation can cause
\fBpthread_rwlockattr_destroy()\fR to set the object referenced by \fIattr\fR
to an invalid value.
.SH RETURN VALUES
.sp
.LP
If successful, the \fBpthread_rwlockattr_init()\fR and
\fBpthread_rwlockattr_destroy()\fR functions return \fB0\fR. Otherwise, an
error number is returned to indicate the error.
.SH ERRORS
.sp
.LP
The \fBpthread_rwlockattr_init()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBENOMEM\fR\fR
.ad
.RS 10n
Insufficient memory exists to initialize the read-write lock attributes object.
.RE
.sp
.LP
The \fBpthread_rwlockattr_destroy()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The value specified by \fIattr\fR is invalid.
.RE
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp
.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
Interface Stability Standard
_
MT-Level MT-Safe
.TE
.SH SEE ALSO
.sp
.LP
\fBpthread_rwlock_init\fR(3C), \fBpthread_rwlock_rdlock\fR(3C),
\fBpthread_rwlock_unlock\fR(3C), \fBpthread_rwlock_wrlock\fR(3C),
\fBpthread_rwlockattr_getpshared\fR(3C), \fBattributes\fR(5),
\fBstandards\fR(5)
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