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.\" $OpenBSD: pthread_spin_init.3,v 1.2 2013/06/05 03:44:50 tedu Exp $
.\"
.\" Copyright (c) 2012 Paul Irofti <pirofti@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.\"
.Dd $Mdocdate: June 5 2013 $
.Dt PTHREAD_SPIN_INIT 3
.Os
.Sh NAME
.Nm pthread_spin_init ,
.Nm pthread_spin_destroy
.Nd initialize and destroy a spinlock object
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fn pthread_spin_init "pthread_spinlock_t *lock" "int pshared"
.Ft int
.Fn pthread_spin_destroy "pthread_spinlock_t *lock"
.Sh DESCRIPTION
The
.Fn pthread_spin_init
function creates a new spinlock object, with sharing attributes specified by
.Fa pshared .
.Pp
The
.Fn pthread_spin_destroy
function frees the resources allocated for the
.Fa lock .
.Sh RETURN VALUES
If successful,
.Fn pthread_spin_init
and
.Fn pthread_spin_destroy
return zero; otherwise an error number is returned to indicate the error.
.Sh ERRORS
.Fn pthread_spin_init
will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa lock
is invalid.
.It Bq Er ENOMEM
The process cannot allocate enough memory to create another spinlock object.
.It Bq Er ENOTSUP
The shared attributes specified by
.Fa pshared
are not supported by the current implementation.
.El
.Pp
.Fn pthread_spin_destroy
will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa lock
is invalid.
.It Bq Er EBUSY
The lock is still in use.
.El
.Sh SEE ALSO
.Xr pthread_spin_lock 3 ,
.Xr pthread_spin_unlock 3
.Sh STANDARDS
.Fn pthread_spin_init
and
.Fn pthread_spin_destroy
conform to
.St -p1003.1-2008 .
.Sh BUGS
Currently only
.Dv PTHREAD_PROCESS_PRIVATE
spinlocks are supported and the pshared attribute is
always set that way.
Any attempts to initialize it to a different value will trigger
.Er ENOTSUP .
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