Merge branch 'master' into external_pager_mechanism

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	microkernel/mach/external_pager_mechanism.mdwn

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diff --git a/glibc/signals.mdwn b/glibc/signals.mdwn
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+[[!meta copyright="Copyright © 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]]."]]"""]]
+
+*[[UNIX]] signals* are a means to asynchronously invoke a specific function
+(*signal handler*).  This may impact on [[system call]]s that are executing at
+the same time in that they may be completely aborted, return incomplete
+results, scheduled for restarting, or cause signal delivery to be blocked upon
+the system call's completion.
+
+An explanation can be found in the relevant standards, an overview, including
+UNIX signals' deficiencies is given in {{$unix#2010_brown_ghosts_3}}, for
+example.
+
+The UNIX signalling mechanism is implemented for the GNU Hurd by means of a
+separate signal-handling thread that is part of every process.  This makes
+handling of signals a separate thread of control.
+
+  * [[SA_SIGINFO, SA_SIGACTION|open_issues/sa_siginfo_sa_sigaction]]
+
+
+# External
+
+  * {{$unix#djb_self-pipe}}.
+
+  * {{$unix#rjk_fork}}.