1.\" $NetBSD: _lwp_suspend.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_SUSPEND 2 39.Os 40.Sh NAME 41.Nm _lwp_suspend , 42.Nm _lwp_continue 43.Nd suspend or continue a light-weight process 44.Sh LIBRARY 45.Lb libc 46.Sh SYNOPSIS 47.In lwp.h 48.Ft int 49.Fn _lwp_suspend "lwpid_t lwp" 50.Ft int 51.Fn _lwp_continue "lwpid_t lwp" 52.Sh DESCRIPTION 53.Fn _lwp_suspend 54suspends execution of the LWP specified by 55.Fa lwp . 56Once an LWP is suspended, subsequent calls to 57.Fn _lwp_suspend 58have no effect. 59The only way to resume execution of a suspended LWP is via 60.Fn _lwp_continue . 61.Pp 62.Fn _lwp_continue 63resumes execution of the LWP specified by 64.Fa lwp . 65Once an LWP is resumed, subsequent calls to 66.Fn _lwp_continue 67have no effect. 68.Sh RETURN VALUES 69Upon successful completion, 70.Fn _lwp_suspend 71and 72.Fn _lwp_continue 73return a value of 0. 74Otherwise, an error code is returned to indicate the error. 75.Sh ERRORS 76.Fn _lwp_suspend 77and 78.Fn _lwp_continue 79will fail if: 80.Bl -tag -width [EDEADLK] 81.It Bq Er ESRCH 82No LWP can be found in the current process corresponding to that 83specified by 84.Fa lwp . 85.El 86.Pp 87.Fn _lwp_suspend 88will fail if: 89.Bl -tag -width [EDEADLK] 90.It Bq Er EDEADLK 91The LWP specified by 92.Fa lwp 93is the only LWP in the process. 94.El 95.Sh SEE ALSO 96.Xr _lwp_create 2 97.Sh HISTORY 98The 99.Fn _lwp_create 100system call first appeared in 101.Nx 2.0 . 102