Changes:
* Totally revamped implementation of FXThreadPool. The new FXThreadPool
is organized about a lock-free queue, with semaphores managing
synchronization between producer- and worker-threads. Thus, threads
never block unless two edge conditions are reached: either the
task-queue is empty, in which case worker threads will block (nothing
to do), or task queue is filled up, and producer thread will block
(no room in queue). An important new capability is for an additional
thread to enter into the task-processing loop temporarily. Finally,
the thread starting FXThreadPool, as well as the worker threads
belonging to the FXThreadPool now have a thread-local variable
referencing the FXThreadPool. This allows the threads involved to
locate the address of the FXThreadPool, for instance to create an
FXTaskGroup.
* New FXTaskGroup class manages groups of task to be executed in parallel
on a FXThreadPool. Tasks started through the FXTaskGroup interface are
guaranteed to be completed within the lifetime of the FXTaskGroup
instance.
* New FXParallelInvoke and FXParallelFor template functions to implement
parallel function call, and parallel for loop. This uses the new
FXTaskGroup, and indirectly, FXThreadPool.
* Pass optional stacksize when constructing FXWorker. Added stacksize
option to FXThreadPool with which new workers will be started.
* FXBarrier wait primitive now sports API's to change break-through
threshold, and forced-release option.
* FXSemaphore now has API's for timed wait, and try-wait for non-blocking
semaphore decrement.
* Added additional atomic variable types in FXAtomic.h.
* Added check for maximum dash-pattern length in FXDC and FXDCWindow.
* Fixed some issues with FXStat of files.
* Off-by-one error fixed in FXRex counted repeat of complex subpatterns.
* Clear internal text pointers in FXRex prior to a match.
* Added a few missing print-patterns to Adie.stx syntax file.
* Added FXSemaphore-protected queue class FXSemaQueue; this is itself a
wrapper around FXPtrQueue.
* Added lock-free queue class FXLFQueue.
* Numeric conversion issues fixed in fxstrtod.cpp; in particular, some
corner cases now give more accurate results.
* The function fxscanf.cpp does no longer eat the "e" when scanning for a
number, unless actually followed by digits.
* Switch to statvfs() from statfs() in FXStat.
* Indexing operator added to FXAutoPtr.
* Added new class FXScopedThread. FXScopedThread automatically performs a
join() upon destruction.
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