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
100 lines
3.4 KiB
Groff
100 lines
3.4 KiB
Groff
.\" $NetBSD: _lwp_create.2,v 1.4 2008/04/30 13:10:51 martin Exp $
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.\"
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.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe of Wasabi Systems, Inc.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd January 13, 2003
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.Dt _LWP_CREATE 2
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.Os
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.Sh NAME
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.Nm _lwp_create
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.Nd create a new light-weight process
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.Sh LIBRARY
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.Lb libc
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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_create "ucontext_t *context" "unsigned long flags" "lwpid_t *new_lwp"
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.Sh DESCRIPTION
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.Fn _lwp_create
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causes creation of a new light-weight process, or LWP, and adds it to the
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current process.
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The
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.Fa context
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argument specifies the initial execution context for the new LWP including
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signal mask, stack, and machine registers.
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.Pp
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The following flags affect the creation of the new LWP:
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.Bl -tag -width LWP_SUSPENDED
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.It LWP_DETACHED
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The LWP is created detached.
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The resources associated with a detached LWP will be automatically
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reclaimed by the system when the LWP exits.
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Otherwise, a terminated LWP's resources will not be reclaimed until
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its status is reported to another LWP via
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.Xr _lwp_wait 2 .
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.It LWP_SUSPENDED
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The LWP is created suspended, and will not begin execution until
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it is resumed by another LWP via
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.Xr _lwp_continue 2 .
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.\" __LWP_ASLWP is not yet implemented by the NetBSD kernel.
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.El
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.Pp
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The LWP ID of the new LWP is stored in the location pointed to by
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.Fa new_lwp .
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.Sh RETURN VALUES
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Upon successful completion,
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.Fn _lwp_create
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returns a value of 0.
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Otherwise, an error code is returned to indicate the error.
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.Sh ERRORS
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.Fn _lwp_create
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will fail and no LWP will be created if:
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.Bl -tag -width [EAGAIN]
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.It Bq Er EAGAIN
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The system-imposed limit on the total
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number of LWPs under execution would be exceeded.
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This limit is configuration-dependent.
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.It Bq Er ENOMEM
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There is insufficient swap space for the new LWP.
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.It Bq Er EFAULT
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The address pointed to by
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.Fa context
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or
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.Fa new_lwp
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is outside the process's allocated address space.
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.El
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.Sh SEE ALSO
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.Xr _lwp_continue 2 ,
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.Xr _lwp_exit 2 ,
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.Xr _lwp_wait 2 ,
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.Xr _lwp_makecontext 3
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.Sh HISTORY
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The
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.Fn _lwp_create
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system call first appeared in
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.Nx 2.0 .
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