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[[!meta copyright="Copyright © 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
2010, 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
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Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
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* Mach's [[concepts]].
* [*Meet Mach* by James
Scott](http://beefchunk.com/documentation/macosx-programming/Meet_Mach.pdf),
a summary of Mach's history and main concepts.
* *[[The_GNU_Mach_Reference_Manual|gnumach/reference_manual]]*.
* {{$mach#kernel_foundation_unix}}
* {{$mach#vm}}
* {{$mach#kernel_principles}}
* {{$mach#kernel_interface}}
* {{$mach#server_writer}}
* {{$mach#server_interface}}
* [*The Unofficial GNU Mach IPC beginner's
guide*](http://hurdextras.nongnu.org/ipc_guide/), an easy introduction to
Inter Process Comunication in the Mach microkernel by Manuel Pavón
Valderrama.
* [*Mach IPC without
MIG*](http://walfield.org/pub/people/neal/papers/hurd-misc/mach-ipc-without-mig.txt),
an exercise by Neal Walfield *to understand Mach IPC at one of its lowest
application levels*.
* [*ipc-hello.c*](http://walfield.org/pub/people/neal/papers/hurd-misc/ipc-hello.c):
*Hello world à la mach ipc*.
- [Porting and Modifying the Mach 3.0 Microkernel](http://shakthimaan.com/downloads/hurd/Porting%20and%20Modifying%20the%20Mach%203.0%20Microkernel.pdf)
- [An IO System for Mach](http://shakthimaan.com/downloads/hurd/An%20IO%20System%20for%20Mach.pdf)
- [A Programmers' Guide to Mach System Call](http://shakthimaan.com/downloads/hurd/A.Programmers.Guide.to.the.Mach.System.Calls.pdf)
# IRC, freenode, #hurd, 2013-09-15
<teythoon> braunr: btw, are there multiple kernel threads in gnumach?
<teythoon> and is it safe to do a synchronous rpc call to a userspace server?
<braunr> teythoon: there are yes, but few
<braunr> teythoon: the main (perhaps only) kernel thread is the page daemon
<braunr> and no, it's not safe to do synchronous calls to userspace
<braunr> except to the default pager
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