* FXJSONFile class added. Base class FXJSON improved and generalized.
* FXIO now tracks file position; new implementation of FXIO counts bytes
read/written.
* FXPipe API's added, should now be functional.
* Renamed FXStringMap to FXStringDictionary for consistency.
* Fixed a few problems in FXVariantMap, FXDictionary.
* Fixed possible race in FXThreadPool::startWorker.
* New FXThreadException class added; FXThreadException will cause graceful
early termination of a thread when thrown inside of FXThread.
* FXThread now interceps only FXException (and subclasses), rethrows other
exceptions. This was necessary due to the way GNU C++ library performs thread
exits.
* Non FOX exceptions thrown inside FXThread are now rethrown; but attempts
are made to maintain proper bookkeeping when unrolling the stack.
* FXThreadPool tasks may throw exceptions. FXThreadPool now intercepts all
FOX exceptions and updates bookkeeping when other exceptions are thrown. Note:
tasks in FXThreadPool are executed by threads, but since sometimes the main
thread is executing tasks in FXThreadPool also we can not allow tasks to throw
FXThreadException.
* Exceptions thrown inside FXWorker now terminate the worker, and reclaim
worker's thread and memory. Before exceptions were all caught, making it
impossible to pass return codes from worker execution.
* Exceptions thrown in FXTaskGroup::Task correctly reclaim the
FXTaskGroup::Task now, and will update completion count and notifications
appropriately.
* The exception philosophy in FOX is that the library only manages FXExceptions
and their subclasses; other exceptions will be either uncaught or
caught and rethrown after bookkeeping updates; thus programs should be careful
throwing exceptions other than FXExceptions.
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