1.\" $NetBSD: _lwp_suspend.2,v 1.4 2008/04/30 13:10:51 martin 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.\" 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 13, 2003 31.Dt _LWP_SUSPEND 2 32.Os 33.Sh NAME 34.Nm _lwp_suspend , 35.Nm _lwp_continue 36.Nd suspend or continue a light-weight process 37.Sh LIBRARY 38.Lb libc 39.Sh SYNOPSIS 40.In lwp.h 41.Ft int 42.Fn _lwp_suspend "lwpid_t lwp" 43.Ft int 44.Fn _lwp_continue "lwpid_t lwp" 45.Sh DESCRIPTION 46.Fn _lwp_suspend 47suspends execution of the LWP specified by 48.Fa lwp . 49Once an LWP is suspended, subsequent calls to 50.Fn _lwp_suspend 51have no effect. 52The only way to resume execution of a suspended LWP is via 53.Fn _lwp_continue . 54.Pp 55.Fn _lwp_continue 56resumes execution of the LWP specified by 57.Fa lwp . 58Once an LWP is resumed, subsequent calls to 59.Fn _lwp_continue 60have no effect. 61.Sh RETURN VALUES 62Upon successful completion, 63.Fn _lwp_suspend 64and 65.Fn _lwp_continue 66return a value of 0. 67Otherwise, an error code is returned to indicate the error. 68.Sh ERRORS 69.Fn _lwp_suspend 70and 71.Fn _lwp_continue 72will fail if: 73.Bl -tag -width [EDEADLK] 74.It Bq Er ESRCH 75No LWP can be found in the current process corresponding to that 76specified by 77.Fa lwp . 78.El 79.Pp 80.Fn _lwp_suspend 81will fail if: 82.Bl -tag -width [EDEADLK] 83.It Bq Er EDEADLK 84The LWP specified by 85.Fa lwp 86is the only LWP in the process. 87.El 88.Sh SEE ALSO 89.Xr _lwp_create 2 90.Sh HISTORY 91The 92.Fn _lwp_create 93system call first appeared in 94.Nx 2.0 . 95