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| author | Thomas Schwinge <thomas@schwinge.name> | 2010-12-13 20:22:52 +0100 |
|---|---|---|
| committer | Thomas Schwinge <thomas@schwinge.name> | 2010-12-13 20:22:52 +0100 |
| commit | 4eea3efc13acccfb613571f604f17e0ec68e5bed (patch) | |
| tree | 9c72a7790d6eb1602614971853131e3cc3f68174 /microkernel/mach/task.mdwn | |
| parent | cfccdc1bdbee7fb25ef0aa9639a3ffec926bf690 (diff) | |
| download | web-4eea3efc13acccfb613571f604f17e0ec68e5bed.tar.gz web-4eea3efc13acccfb613571f604f17e0ec68e5bed.tar.bz2 web-4eea3efc13acccfb613571f604f17e0ec68e5bed.zip | |
``Some'' Mach documentation.
Parts have been rescued from
4b382d8daa5a9e2d54e78c18beeff76bc54dc16b:Mach/MachConcepts.mdwn.
Diffstat (limited to 'microkernel/mach/task.mdwn')
| -rw-r--r-- | microkernel/mach/task.mdwn | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/microkernel/mach/task.mdwn b/microkernel/mach/task.mdwn new file mode 100644 index 00000000..c03c6a14 --- /dev/null +++ b/microkernel/mach/task.mdwn @@ -0,0 +1,23 @@ +[[!meta copyright="Copyright © 2002, 2003, 2010 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]]."]]"""]] + +A Mach *task* is a collection of resources, a [[virtual_address_space]], and a +[[port name space|port]]. They depend on [[thread]]s for executing program +code: a task alone has no means to do so. + +Switching from one task to another one involves doing a *context switch*, which +is usually not a cheap operation, as it involves switching the hardware's idea +of the memory layout ([[virtual_address_space]]), amongst others. + +Mach tasks are distinct from [[UNIX processes|unix/process]] in that they +provide less facilities. In processes, there are [[unix/signal]]s, process / +group / session IDs, [[unix/file_descriptor]]s and many other things. Tasks +are used for resource allocation and sharing; they are *resource container*s. |