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flightgear/acconfig.h
curt b0b6c34249 Initial stab at a threaded tile loader contributed by Bernie Bright. 
He writes:

Here are the final changes to add threads to the tile loading.  All the
thread related code is in the new FGTileLoader class.

./configure.in
./acconfig.h
Added --with-threads option and corresponding ENABLE_THREADS
definition.  The default is no threads.

./src/Scenery/tilemgr
Removed load_queue and associated references.  This has been replaced by
a new class FGTileLoader in FGNewCache.
Made the global variable global_tile_cache a member.
schedule_needed(): removed global_tile_cache.exists() tests since
sched_tile() effectively repeats the test.
initialize_queue(): removed code that loads tiles since this is now
performed by FGTileLoader.
update(): ditto

./src/Scenery/newcache
Added new class FGTileLoader to manage tile queuing and loading.
tile_map typedefs are private.
exists() is a const member function.
fill_in(): deleted
load_tile(): added.

./src/Scenery/FGTileLoader
The new threaded tile loader.  Maintains a queue of tiles waiting to be
loaded and an array of one or more threads to load the tiles.  Currently
only a single thread is created.  The queue is guarded by a mutex to
synchronize access.  A condition variable signals the thread when the
queue is non-empty.

CLO: I made a few tweaks to address a couple issues, hopefully what we
have is solid, but now we kick it out to the general public to see. :-)
2001-04-11 02:47:15 +00:00

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/* acconfig.h
This file is in the public domain.
Descriptive text for the C preprocessor macros that
the distributed Autoconf macros can define.
No software package will use all of them; autoheader copies the ones
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The entries are in sort -df order: alphabetical, case insensitive,
ignoring punctuation (such as underscores). Although this order
can split up related entries, it makes it easier to check whether
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Leave the following blank line there!! Autoheader needs it. */
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System headers sometimes define this.
We just want to avoid a redefinition error message. */
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