1.\" $NetBSD: _lwp_unpark.2,v 1.5 2022/12/04 16:17:50 uwe Exp $ 2.\" 3.\" Copyright (c) 2003, 2007 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd January 20, 2007 31.Dt _LWP_UNPARK 2 32.Os 33.Sh NAME 34.Nm _lwp_unpark 35.Nd resume execution of a waiting LWP 36.Sh LIBRARY 37.Lb libc 38.Sh SYNOPSIS 39.In lwp.h 40.Ft int 41.Fn _lwp_unpark "lwpid_t lwp" "const void *hint" 42.Sh DESCRIPTION 43.Fn _lwp_unpark 44resumes execution of the light-weight process 45.Fa lwp . 46.Pp 47The target LWP is assumed to be waiting in the kernel as a result of a 48call to 49.Fn _lwp_park . 50If the target LWP is not currently waiting, it will return immediately 51upon the next call to 52.Fn _lwp_park . 53.Pp 54See 55.Xr _lwp_park 2 56for a description of the 57.Fa hint 58argument. 59.Sh RETURN VALUES 60.Rv -std _lwp_unpark 61.Sh ERRORS 62.Bl -tag -width Er 63.It Bq Er ESRCH 64No LWP can be found in the current process corresponding to that 65specified by 66.Fa lwp . 67.El 68.Sh SEE ALSO 69.Xr _lwp_park 2 , 70.Xr _lwp_unpark_all 2 , 71.Xr _lwp_wakeup 2 72.Sh HISTORY 73The 74.Fn _lwp_unpark 75system call first appeared in 76.Nx 5.0 . 77