2001-12-02 02:13:35 +00:00
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.\"
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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. 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(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), 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 COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 7, 2001
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.Dt VM_PAGE_GRAB 9
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.Os
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.Sh NAME
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.Nm vm_page_grab
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.Nd "returns a page from an object"
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.Sh SYNOPSIS
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.In sys/param.h
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.In vm/vm.h
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.In vm/vm_page.h
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.Ft vm_page_t
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.Fn vm_page_grab "vm_object_t object" "vm_pindex_t pindex" "int allocflags"
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.Sh DESCRIPTION
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The
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.Fn vm_page_grab
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function returns the page at
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.Fa pindex
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from the given object.
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2001-12-14 09:11:13 +00:00
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If the page exists and is busy,
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2001-12-02 02:13:35 +00:00
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.Fn vm_page_grab
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will sleep while waiting for it.
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2001-12-14 09:11:13 +00:00
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If the page does not exist, it is allocated.
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2001-12-02 02:13:35 +00:00
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.Pp
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If
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.Dv VM_ALLOC_RETRY
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is not set in
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.Fa allocflags
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and the function sleeps, either getting the page from the object
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or while allocating it,
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.Dv NULL
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is returned.
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.Sh RETURN VALUES
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2001-12-14 09:11:13 +00:00
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If successful,
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.Fn vm_page_grab
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2001-12-14 09:11:13 +00:00
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returns the page; otherwise,
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.Dv NULL
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is returned.
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.Sh SEE ALSO
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.Xr vm_page_alloc 9
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.Sh AUTHORS
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This man page was written by
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.An Chad David Aq davidc@acns.ab.ca .
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