1.\" $NetBSD: _lwp_unpark.2,v 1.2 2007/02/10 10:34:03 ad 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.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the NetBSD 20.\" Foundation, Inc. and its contributors. 21.\" 4. Neither the name of The NetBSD Foundation nor the names of its 22.\" contributors may be used to endorse or promote products derived 23.\" from this software without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" 37.Dd January 20, 2007 38.Dt _LWP_UNPARK 2 39.Os 40.Sh NAME 41.Nm _lwp_unpark 42.Nd resume execution of a waiting LWP 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.In lwp.h 47.Ft int 48.Fn _lwp_unpark "lwpid_t lwp" "const void *hint" 49.Sh DESCRIPTION 50.Fn _lwp_unpark 51resumes execution of the light-weight process 52.Fa lwp . 53.Pp 54The target LWP is assumed to be waiting in the kernel as a result of a 55call to 56.Fn _lwp_park . 57If the target LWP is not currently waiting, it will return immediatley 58upon the next call to 59.Fn _lwp_park . 60.Pp 61See 62.Xr _lwp_park 2 63for a description of the 64.Fa hint 65argument. 66.Sh RETURN VALUES 67A 0 value indicates that the call succeeded. 68A \-1 return value indicates an error occurred and 69.Va errno 70is set to indicate the reason. 71.Sh ERRORS 72.Bl -tag -width [EINVAL] 73.It Bq Er ESRCH 74No LWP can be found in the current process corresponding to that 75specified by 76.Fa lwp . 77.El 78.Sh SEE ALSO 79.Xr _lwp_park 2 , 80.Xr _lwp_unpark_all 2 , 81.Xr _lwp_wakeup 2 82.Sh HISTORY 83The 84.Fn _lwp_unpark 85system call first appeared in 86.Nx 5.0 . 87