minix/lib/libc/sys/_lwp_suspend.2

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.\" $NetBSD: _lwp_suspend.2,v 1.4 2008/04/30 13:10:51 martin Exp $
.\"
.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe of Wasabi Systems, Inc.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.Dd January 13, 2003
.Dt _LWP_SUSPEND 2
.Os
.Sh NAME
.Nm _lwp_suspend ,
.Nm _lwp_continue
.Nd suspend or continue a light-weight process
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In lwp.h
.Ft int
.Fn _lwp_suspend "lwpid_t lwp"
.Ft int
.Fn _lwp_continue "lwpid_t lwp"
.Sh DESCRIPTION
.Fn _lwp_suspend
suspends execution of the LWP specified by
.Fa lwp .
Once an LWP is suspended, subsequent calls to
.Fn _lwp_suspend
have no effect.
The only way to resume execution of a suspended LWP is via
.Fn _lwp_continue .
.Pp
.Fn _lwp_continue
resumes execution of the LWP specified by
.Fa lwp .
Once an LWP is resumed, subsequent calls to
.Fn _lwp_continue
have no effect.
.Sh RETURN VALUES
Upon successful completion,
.Fn _lwp_suspend
and
.Fn _lwp_continue
return a value of 0.
Otherwise, an error code is returned to indicate the error.
.Sh ERRORS
.Fn _lwp_suspend
and
.Fn _lwp_continue
will fail if:
.Bl -tag -width [EDEADLK]
.It Bq Er ESRCH
No LWP can be found in the current process corresponding to that
specified by
.Fa lwp .
.El
.Pp
.Fn _lwp_suspend
will fail if:
.Bl -tag -width [EDEADLK]
.It Bq Er EDEADLK
The LWP specified by
.Fa lwp
is the only LWP in the process.
.El
.Sh SEE ALSO
.Xr _lwp_create 2
.Sh HISTORY
The
.Fn _lwp_create
system call first appeared in
.Nx 2.0 .