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.\" $OpenBSD: pthread_spin_lock.3,v 1.3 2020/04/06 00:01:08 pirofti Exp $
.\"
.\" Copyright (c) 2012 Paul Irofti <paul@irofti.net>
.\"
.\" 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: April 6 2020 $
.Dt PTHREAD_SPIN_LOCK 3
.Os
.Sh NAME
.Nm pthread_spin_lock ,
.Nm pthread_spin_trylock
.Nd lock a spinlock object
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fn pthread_spin_lock "pthread_spinlock_t *lock"
.Ft int
.Fn pthread_spin_trylock "pthread_spinlock_t *lock"
.Sh DESCRIPTION
The
.Fn pthread_spin_lock
function locks the spinlock referenced by
.Fa lock .
The calling thread will acquire the lock if it's not owned by another thread.
Otherwise it will spin until the lock becomes available.
.Pp
The
.Fn pthread_spin_trylock
function will acquire the lock if the
.Fa lock
is not owned by another thread.
Otherwise it will fail.
.Sh RETURN VALUES
If successful,
.Fn pthread_spin_lock
and
.Fn pthread_spin_trylock
return zero; otherwise an error number is returned to indicate the error.
.Sh ERRORS
.Fn pthread_spin_lock
will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa lock
is invalid.
.It Bq Er EDEADLK
A deadlock condition was detected.
.El
.Pp
.Fn pthread_spin_trylock
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.
.It Bq Er EDEADLK
A deadlock condition was detected.
.El
.Sh SEE ALSO
.Xr pthread_spin_init 3 ,
.Xr pthread_spin_unlock 3
.Sh STANDARDS
.Fn pthread_spin_lock
and
.Fn pthread_spin_trylock
conform to
.St -p1003.1-2008 .
|
