2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
96 lines
3.5 KiB
Groff
96 lines
3.5 KiB
Groff
.\" $NetBSD: _lwp_ctl.2,v 1.3 2009/02/17 18:51:56 njoly Exp $
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.\"
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.\" Copyright (c)2007 YAMAMOTO Takashi,
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" ------------------------------------------------------------
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.Dd May 5, 2008
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.Dt _LWP_CTL 2
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.Os
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.Sh NAME
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.Nm _lwp_ctl
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.Nd prepare per-LWP communication area between kernel and userland
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.\" ------------------------------------------------------------
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.Sh LIBRARY
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.Lb libc
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.\" ------------------------------------------------------------
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.Sh SYNOPSIS
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.In lwp.h
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.Ft int
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.Fn _lwp_ctl "int features" "struct lwpctl **address"
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.\" ------------------------------------------------------------
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.Sh DESCRIPTION
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.Fn _lwp_ctl
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prepares per-LWP communication area for the calling LWP,
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and maps it into the calling process' address space.
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It takes the following arguments.
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.Bl -tag -width features
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.It Fa features
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The bitwise-OR of the following flags.
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.Bl -tag -width LWPCTL_FEATURE_CURCPU
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.It Dv LWPCTL_FEATURE_CURCPU
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Request lc_curcpu.
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.It Dv LWPCTL_FEATURE_PCTR
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Request lc_pctr.
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.El
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.It Fa address
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The address to store a pointer to lwpctl structure for the calling LWP.
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.El
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.Pp
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The per-LWP communication area is described by an lwpctl structure.
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It has following members, depending on
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.Fa features .
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.Bl -tag -width int_lc_curcpu
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.It int lc_curcpu
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The integral identifier of the CPU on which the LWP is running,
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or
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.Dv LWPCTL_CPU_NONE
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when the LWP is not running on any CPU.
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It's updated by the kernel and should be considered as read-only for
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userland.
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It's available only if requested with the
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.Dv LWPCTL_FEATURE_CURCPU
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flag.
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.It int lc_pctr
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The integer which is incremented on every context switches to the LWP.
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It can be used to detect preemption of the LWP.
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(thus its name "preemption counter".)
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It's updated by the kernel and should be considered as read-only for
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userland.
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It's available only if requested with the
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.Dv LWPCTL_FEATURE_PCTR
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flag.
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.El
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.\" ------------------------------------------------------------
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.Sh RETURN VALUES
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.Fn _lwp_ctl
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returns 0 on success.
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Otherwise, \-1 is returned and
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.Va errno
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is set to indicate the error.
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.\" ------------------------------------------------------------
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.\".Sh ERRORS
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.\" ------------------------------------------------------------
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.Sh SEE ALSO
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.Xr errno 2
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