1.\" $NetBSD: _lwp_wait.2,v 1.3 2003/04/16 13:34:50 wiz Exp $ 2.\" 3.\" Copyright (c) 2003 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. 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 13, 2003 38.Dt _LWP_WAIT 2 39.Os 40.Sh NAME 41.Nm _lwp_wait 42.Nd wait for light-weight process termination 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.In lwp.h 47.Ft int 48.Fn _lwp_wait "lwpid_t wlwp" "lwpid_t *rlwp" 49.Sh DESCRIPTION 50.Fn _lwp_wait 51suspends execution of the calling LWP until the LWP specified by 52.Fa wlwp 53terminates. 54The specified LWP must not be detached. 55If 56.Fa wlwp 57is 0, then 58.Fn _lwp_wait 59waits for any undetached LWP in the current process. 60.Pp 61If 62.Fa rlwp 63is not 64.Dv NULL , 65then it points to the location where the LWP ID of 66the exited LWP is stored. 67.Sh RETURN VALUES 68Upon successful completion, 69.Fn _lwp_wait 70returns a value of 0. 71Otherwise, an error code is returned to indicate the error. 72.Sh ERRORS 73.Fn _lwp_wait 74will fail if: 75.Bl -tag -width [EDEADLK] 76.It Bq Er ESRCH 77No undetached LWP can be found in the current process corresponding to that 78specified by 79.Fa wlwp . 80.It Bq Er EDEADLK 81The calling LWP is the only LWP in the process. 82.It Bq Er EDEADLK 83The LWP ID specified by 84.Fa wlwp 85is the LWP ID of the calling LWP. 86.It Bq Er EINTR 87.Fn _lwp_wait 88was interrupted by a caught signal, or the signal did not 89have the 90.Dv SA_RESTART 91flag set. 92.El 93.Sh SEE ALSO 94.Xr _lwp_create 2 , 95.Xr _lwp_exit 2 96.Sh HISTORY 97The 98.Fn _lwp_wait 99system call first appeared in 100.Nx 2.0 . 101