This is needed by Concurrent.

Thread.Condition: Fix edge case in fallback implementation

Old pike 8.0 binaries do not have Pike.DestructImmediate, and it is
not meaningful to attempt to kludge around it, as the corresponding
program flag is not propagated with them anyway.

Thread.Queue et al should now survive their controlling MutexKey
having ended up in a backtrace.

Fixes [PIKE-157].

Glibc 2.24 and earlier have a broken implementation of condition
variables (cf https://sourceware.org/bugzilla/show_bug.cgi?id=13165).

Attempt to work around the issue by having the signalling thread
release the associated mutex before signalling.

Potential fix for [Pike-140].

This is intended to ensure that the state-changed signal
is not lost.

Consider the case when there is a thread that listens on the
condition, but does not act on it; it could starve the threads
that do intend to act on it.

Fixes [PIKE-140].

avoid delayed deallocation.

In case an exception was thrown, the value of err ended up being
the Result object, while the error got lost.

thread creation and termination for the purpose of tracking thread names.

The Thread.Queue API ought to be extended to be compatible with ADT.Queue.

Mast explains the reason rather clearly:

  The reason for its existance was that it was supposed to be
  supported to be possible to write

    Thread t = Thread(...);

  Unfortunately that was completely and utterly wrong. The loads of
  optional modifiers in the file is a telltale sign that the module
  Thread, which contains tools to use with threads, and
  Thread.Thread, which represents a specific thread, are two
  completely different things. That being the case, it's hardly wise
  to give them the same name.

  An example where this stunt breaks down is when the module is
  inherited: If the type name for a thread object is Thread then it's
  reasonable to believe that you can inherit Thread to make a custom
  thread class with some extra context. But not only do you get loads
  of stuff with that inherit which are meaningless to have in a
  thread instance (mutexes, queues, etc), you also get a nonworking
  thread since the create function is overridden here to avoid a
  thread being created when the module is created.

  Using Thread as a type name for thread objects has been strongly
  discouraged. I.e. use "Thread.Thread t = Thread.Thread()" and _not_
  "Thread t = Thread()".

The feature has been discouraged since Pike 7.7.10 (2004-10-14), and
is likely to have been broken since at least Pike 7.7.28 (2006-04-07).

This commit also marks Thread.`()() as deprecated.

The support for asynchronous results was broken in several ways.

Also added some initial documentation.

Thread.Queue.read_array.

Patch contributed by Artur Skawina. Thanks.

Rev: lib/modules/Thread.pmod:1.47

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Rev: lib/modules/Sql.pmod/postgres.pike:1.29
Rev: lib/modules/Sql.pmod/sql_util.pmod:1.22
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Rev: lib/modules/Standards.pmod/FIPS10_4.pmod:1.5
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Rev: lib/modules/Standards.pmod/XML.pmod/Wix.pmod:1.28
Rev: lib/modules/Thread.pmod:1.46
Rev: lib/modules/Tools.pmod/Shoot.pmod/GC.pike:1.3
Rev: lib/modules/Tools.pmod/Standalone.pmod/pmar_install.pike:1.9
Rev: lib/modules/Web.pmod/RSS.pmod:1.8
Rev: lib/modules/_Image_XCF.pmod:1.26
Rev: lib/modules/__builtin_dirnode.pmod:1.3

Rev: lib/modules/ADT.pmod/Heap.pike:1.12
Rev: lib/modules/ADT.pmod/Queue.pike:1.14
Rev: lib/modules/ADT.pmod/Relation.pmod/Binary.pike:1.15
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Rev: lib/modules/Cache.pmod/cache.pike:1.14
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Rev: lib/modules/Calendar.pmod/Islamic.pmod:1.11
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Rev: lib/modules/Calendar.pmod/Language.pmod:1.25
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Rev: lib/modules/GLUE.pmod/Driver.pmod/SDL.pike:1.6
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Rev: lib/modules/GTKSupport.pmod/pCtree.pike:1.8
Rev: lib/modules/GTKSupport.pmod/pDrawingArea.pike:1.9
Rev: lib/modules/Geography.pmod/Countries.pmod:1.20
Rev: lib/modules/Geography.pmod/Position.pike:1.18
Rev: lib/modules/Getopt.pmod:1.33
Rev: lib/modules/Graphics.pmod/Graph.pmod/create_graph.pike:1.20
Rev: lib/modules/Graphics.pmod/Graph.pmod/module.pmod:1.9
Rev: lib/modules/Graphics.pmod/Graph.pmod/polyline.pike:1.7
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Rev: lib/modules/Locale.pmod/Charset.pmod/Tables.pmod/iso88591.pmod:1.3
Rev: lib/modules/Locale.pmod/Charset.pmod/module.pmod:1.57
Rev: lib/modules/Locale.pmod/Language.pmod/nld.pmod:1.2
Rev: lib/modules/Locale.pmod/module.pmod:1.25
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Rev: lib/modules/Protocols.pmod/Bittorrent.pmod/PeerID.pmod:1.8
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Rev: lib/modules/Protocols.pmod/OBEX.pmod:1.8
Rev: lib/modules/Protocols.pmod/SMTP.pmod/module.pmod:1.46
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Rev: lib/modules/Protocols.pmod/X.pmod/Extensions.pmod:1.16
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Rev: lib/modules/Tools.pmod/AutoDoc.pmod/PikeExtractor.pmod:1.40
Rev: lib/modules/Tools.pmod/AutoDoc.pmod/PikeObjects.pmod:1.37
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Rev: lib/modules/Tools.pmod/Legal.pmod/License.pmod/GPL.pmod:1.3
Rev: lib/modules/Tools.pmod/Legal.pmod/License.pmod/LGPL.pmod:1.3
Rev: lib/modules/Tools.pmod/Legal.pmod/License.pmod/MPL.pmod:1.3
Rev: lib/modules/Tools.pmod/Monger.pmod/MongerDeveloper.pike:1.8
Rev: lib/modules/Tools.pmod/Monger.pmod/MongerUser.pike:1.8
Rev: lib/modules/Tools.pmod/Monger.pmod/module.pmod:1.3
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Rev: lib/modules/Tools.pmod/Standalone.pmod/join_autodoc.pike:1.19
Rev: lib/modules/Tools.pmod/Standalone.pmod/pmar_install.pike:1.8
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Rev: lib/modules/Tools.pmod/Standalone.pmod/rsqld.pike:1.12
Rev: lib/modules/Tools.pmod/Standalone.pmod/test_pike.pike:1.136
Rev: lib/modules/Tools.pmod/Testsuite.pmod:1.9
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Rev: lib/modules/_Image_DWG.pmod:1.5
Rev: lib/modules/_Image_PS.pmod:1.15
Rev: lib/modules/_Image_XCF.pmod:1.25

Rev: lib/modules/Stdio.pmod/module.pmod:1.231
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Rev: src/modules/_Charset/charsetmod.c:1.63
Rev: src/modules/_Charset/iso2022.c:1.45
Rev: src/program.c:1.632
Rev: src/program.h:1.236

in the Threads module and documented them somewhat.

Rev: lib/modules/Thread.pmod:1.43
Rev: src/threads.c:1.249

module double as Thread.Thread class. The mess itself is still
untouched, though.

Rev: lib/modules/Thread.pmod:1.42

Rev: lib/modules/Thread.pmod:1.41

Rev: lib/modules/Thread.pmod:1.40

Rev: lib/modules/Thread.pmod:1.39

Rev: lib/modules/Thread.pmod:1.38

and Thread.Queue. Added functions to make Thread.Fifo and Thread.Queue
implement the same interface. Let write and try_write return the
number of elements in the fifo/queue. Added fallbacks for Thread.Fifo
and Thread.Queue in nonthreaded mode since it's now possible to use
them in a meaningful way then.

Rev: lib/modules/Thread.pmod:1.37

Rev: lib/modules/Thread.pmod:1.36

Rev: lib/modules/Protocols.pmod/HTTP.pmod/Query.pike:1.47
Rev: lib/modules/Protocols.pmod/HTTP.pmod/Server.pmod/Request.pike:1.13
Rev: lib/modules/Protocols.pmod/IRC.pmod/Client.pike:1.8
Rev: lib/modules/Protocols.pmod/LysKOM.pmod/ProtocolTypes.pmod:1.9
Rev: lib/modules/Protocols.pmod/LysKOM.pmod/Session.pike:1.32
Rev: lib/modules/Protocols.pmod/XMLRPC.pmod/module.pmod:1.20
Rev: lib/modules/SSL.pmod/sslfile.pike:1.50
Rev: lib/modules/Sql.pmod/Sql.pike:1.62
Rev: lib/modules/Sql.pmod/sql_result.pike:1.11
Rev: lib/modules/Standards.pmod/CIFF.pmod/File.pike:1.3
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Rev: lib/modules/Stdio.pmod/FakeFile.pike:1.4
Rev: lib/modules/Stdio.pmod/module.pmod:1.161
Rev: lib/modules/Thread.pmod:1.35

Rev: lib/modules/Thread.pmod:1.34

Rev: lib/master.pike.in:1.173
Rev: lib/modules/ADT.pmod/Table.pmod:1.22
Rev: lib/modules/Array.pmod:1.59
Rev: lib/modules/Thread.pmod:1.33
Rev: src/modules/Yp/module.pmod.in:1.15