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authorhttps://me.yahoo.com/a/g3Ccalpj0NhN566pHbUl6i9QF0QEkrhlfPM-#b1c14 <diana@web>2015-02-16 20:08:03 +0100
committerGNU Hurd web pages engine <web-hurd@gnu.org>2015-02-16 20:08:03 +0100
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-[[!meta copyright="Copyright © 2012, 2013 Free Software Foundation, Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
-is included in the section entitled [[GNU Free Documentation
-License|/fdl]]."]]"""]]
-
-[[!tag open_issue_gnumach]]
-
-
-# IRC, freenode, #hurd, 2012-07-05
-
- <pinotree> braunr: wrt to mach: it seems to me it ticks every 10ms or so,
- it is true?
- <braunr> yes
- <braunr> and it's not preemptible
-
-[[microkernel/mach/gnumach/preemption]].
-
- <pinotree> braunr: that means a gnumach kernel currently has a maximum
- uptime of almost 500 days
- <braunr> pinotree: what do you mean ?
- <pinotree> there's an int (or uint, i don't remember) variable that keeps
- the tick count
- <braunr> yes the tick variable should probably be a 64-bits type
- <braunr> or a struct
- <braunr> but the tick count should only be used for computation on "short"
- delays
- <braunr> and it should be safe to use it even when it overflows
- <braunr> it's not the wall clock
- <pinotree> i found that when investigating why the maximum timeout for a
- mach_msg is like INT_MAX >> 2 (or 4) or something like that, also due to
- the tick count
- <braunr> iirc, in linux, they mostly use the lower 32-bits on 32-bits
- architecture, updating the 32 upper only when necessary