Date: Sun, 8 Nov 2015 01:41:44 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r290531 - head/share/man/man9 Message-ID: <201511080141.tA81fitC064644@repo.freebsd.org>
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Author: markj Date: Sun Nov 8 01:41:44 2015 New Revision: 290531 URL: https://svnweb.freebsd.org/changeset/base/290531 Log: Add a manual page for PHOLD() and friends. MFC after: 1 week Added: head/share/man/man9/PHOLD.9 (contents, props changed) Modified: head/share/man/man9/Makefile Modified: head/share/man/man9/Makefile ============================================================================== --- head/share/man/man9/Makefile Sun Nov 8 01:38:56 2015 (r290530) +++ head/share/man/man9/Makefile Sun Nov 8 01:41:44 2015 (r290531) @@ -209,6 +209,7 @@ MAN= accept_filter.9 \ pfind.9 \ pget.9 \ pgfind.9 \ + PHOLD.9 \ physio.9 \ pmap.9 \ pmap_activate.9 \ @@ -1314,6 +1315,11 @@ MLINKS+=pfil.9 pfil_add_hook.9 \ pfil.9 pfil_wlock.9 \ pfil.9 pfil_wunlock.9 MLINKS+=pfind.9 zpfind.9 +MLINKS+=PHOLD.9 PRELE.9 \ + PHOLD.9 _PHOLD.9 \ + PHOLD.9 _PRELE.9 \ + PHOLD.9 PROC_ASSERT_HELD.9 \ + PHOLD.9 PROC_ASSERT_NOT_HELD.9 MLINKS+=pmap_copy.9 pmap_copy_page.9 MLINKS+=pmap_extract.9 pmap_extract_and_hold.9 MLINKS+=pmap_init.9 pmap_init2.9 Added: head/share/man/man9/PHOLD.9 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/share/man/man9/PHOLD.9 Sun Nov 8 01:41:44 2015 (r290531) @@ -0,0 +1,67 @@ +.\" Copyright (c) 2015 Mark Johnston <markj@FreeBSD.org> +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR +.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, +.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd November 7, 2015 +.Dt PHOLD 9 +.Os +.Sh NAME +.Nm PHOLD +.Nd hold a process +.Sh SYNOPSIS +.In sys/proc.h +.Fn PHOLD "struct proc *p" +.Fn _PHOLD "struct proc *p" +.Fn PRELE "struct proc *p" +.Fn _PRELE "struct proc *p" +.Fn PROC_ASSERT_HELD "struct proc *p" +.Fn PROC_ASSERT_NOT_HELD "struct proc *p" +.Sh DESCRIPTION +The +.Fn PHOLD +macro increments the hold count of a process, and the +.Fn PRELE +macro decrements the hold count of a process. +.Pp +If a process with a non-zero hold count attempts to exit, it will sleep until +its hold count has reached zero before the kernel begins releasing resources +associated with the process. +Once a process has started exiting, it is invalid to increase its hold count. +Thus, callers must not attempt to hold a process that has the +.Dv P_WEXIT +flag set. +The VM daemon will not swap out the kernel stack of a thread belonging to a +process with a non-zero hold count. +.Pp +The +.Fn _PHOLD +and +.Fn _PRELE +macros are identical to +.Fn PHOLD +and +.Fn PRELE , +except that they must be called with the process lock held. +.Sh AUTHORS +This manual page was written by +.An Mark Johnston Aq Mt markj@FreeBSD.org .
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