1*2fe8fb19SBen Gras.\" $NetBSD: _lwp_suspend.2,v 1.4 2008/04/30 13:10:51 martin Exp $ 2*2fe8fb19SBen Gras.\" 3*2fe8fb19SBen Gras.\" Copyright (c) 2003 The NetBSD Foundation, Inc. 4*2fe8fb19SBen Gras.\" All rights reserved. 5*2fe8fb19SBen Gras.\" 6*2fe8fb19SBen Gras.\" This code is derived from software contributed to The NetBSD Foundation 7*2fe8fb19SBen Gras.\" by Jason R. Thorpe of Wasabi Systems, Inc. 8*2fe8fb19SBen Gras.\" 9*2fe8fb19SBen Gras.\" Redistribution and use in source and binary forms, with or without 10*2fe8fb19SBen Gras.\" modification, are permitted provided that the following conditions 11*2fe8fb19SBen Gras.\" are met: 12*2fe8fb19SBen Gras.\" 1. Redistributions of source code must retain the above copyright 13*2fe8fb19SBen Gras.\" notice, this list of conditions and the following disclaimer. 14*2fe8fb19SBen Gras.\" 2. Redistributions in binary form must reproduce the above copyright 15*2fe8fb19SBen Gras.\" notice, this list of conditions and the following disclaimer in the 16*2fe8fb19SBen Gras.\" documentation and/or other materials provided with the distribution. 17*2fe8fb19SBen Gras.\" 18*2fe8fb19SBen Gras.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19*2fe8fb19SBen Gras.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20*2fe8fb19SBen Gras.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21*2fe8fb19SBen Gras.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22*2fe8fb19SBen Gras.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23*2fe8fb19SBen Gras.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24*2fe8fb19SBen Gras.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25*2fe8fb19SBen Gras.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26*2fe8fb19SBen Gras.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27*2fe8fb19SBen Gras.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28*2fe8fb19SBen Gras.\" POSSIBILITY OF SUCH DAMAGE. 29*2fe8fb19SBen Gras.\" 30*2fe8fb19SBen Gras.Dd January 13, 2003 31*2fe8fb19SBen Gras.Dt _LWP_SUSPEND 2 32*2fe8fb19SBen Gras.Os 33*2fe8fb19SBen Gras.Sh NAME 34*2fe8fb19SBen Gras.Nm _lwp_suspend , 35*2fe8fb19SBen Gras.Nm _lwp_continue 36*2fe8fb19SBen Gras.Nd suspend or continue a light-weight process 37*2fe8fb19SBen Gras.Sh LIBRARY 38*2fe8fb19SBen Gras.Lb libc 39*2fe8fb19SBen Gras.Sh SYNOPSIS 40*2fe8fb19SBen Gras.In lwp.h 41*2fe8fb19SBen Gras.Ft int 42*2fe8fb19SBen Gras.Fn _lwp_suspend "lwpid_t lwp" 43*2fe8fb19SBen Gras.Ft int 44*2fe8fb19SBen Gras.Fn _lwp_continue "lwpid_t lwp" 45*2fe8fb19SBen Gras.Sh DESCRIPTION 46*2fe8fb19SBen Gras.Fn _lwp_suspend 47*2fe8fb19SBen Grassuspends execution of the LWP specified by 48*2fe8fb19SBen Gras.Fa lwp . 49*2fe8fb19SBen GrasOnce an LWP is suspended, subsequent calls to 50*2fe8fb19SBen Gras.Fn _lwp_suspend 51*2fe8fb19SBen Grashave no effect. 52*2fe8fb19SBen GrasThe only way to resume execution of a suspended LWP is via 53*2fe8fb19SBen Gras.Fn _lwp_continue . 54*2fe8fb19SBen Gras.Pp 55*2fe8fb19SBen Gras.Fn _lwp_continue 56*2fe8fb19SBen Grasresumes execution of the LWP specified by 57*2fe8fb19SBen Gras.Fa lwp . 58*2fe8fb19SBen GrasOnce an LWP is resumed, subsequent calls to 59*2fe8fb19SBen Gras.Fn _lwp_continue 60*2fe8fb19SBen Grashave no effect. 61*2fe8fb19SBen Gras.Sh RETURN VALUES 62*2fe8fb19SBen GrasUpon successful completion, 63*2fe8fb19SBen Gras.Fn _lwp_suspend 64*2fe8fb19SBen Grasand 65*2fe8fb19SBen Gras.Fn _lwp_continue 66*2fe8fb19SBen Grasreturn a value of 0. 67*2fe8fb19SBen GrasOtherwise, an error code is returned to indicate the error. 68*2fe8fb19SBen Gras.Sh ERRORS 69*2fe8fb19SBen Gras.Fn _lwp_suspend 70*2fe8fb19SBen Grasand 71*2fe8fb19SBen Gras.Fn _lwp_continue 72*2fe8fb19SBen Graswill fail if: 73*2fe8fb19SBen Gras.Bl -tag -width [EDEADLK] 74*2fe8fb19SBen Gras.It Bq Er ESRCH 75*2fe8fb19SBen GrasNo LWP can be found in the current process corresponding to that 76*2fe8fb19SBen Grasspecified by 77*2fe8fb19SBen Gras.Fa lwp . 78*2fe8fb19SBen Gras.El 79*2fe8fb19SBen Gras.Pp 80*2fe8fb19SBen Gras.Fn _lwp_suspend 81*2fe8fb19SBen Graswill fail if: 82*2fe8fb19SBen Gras.Bl -tag -width [EDEADLK] 83*2fe8fb19SBen Gras.It Bq Er EDEADLK 84*2fe8fb19SBen GrasThe LWP specified by 85*2fe8fb19SBen Gras.Fa lwp 86*2fe8fb19SBen Grasis the only LWP in the process. 87*2fe8fb19SBen Gras.El 88*2fe8fb19SBen Gras.Sh SEE ALSO 89*2fe8fb19SBen Gras.Xr _lwp_create 2 90*2fe8fb19SBen Gras.Sh HISTORY 91*2fe8fb19SBen GrasThe 92*2fe8fb19SBen Gras.Fn _lwp_create 93*2fe8fb19SBen Grassystem call first appeared in 94*2fe8fb19SBen Gras.Nx 2.0 . 95