The GNAT run-time implementation may vary with respect to both the underlying threads library and the exception-handling scheme. For threads support, the default run-time will bind to the thread package of the underlying operating system.
For exception handling, either or both of two models are supplied:
Most programs should experience a substantial speed improvement by
being compiled with a ZCX run-time.
This is especially true for
tasking applications or applications with many exception handlers.
Note however that the ZCX run-time does not support asynchronous abort
of tasks (
select-then-abort constructs) and will instead
implement abort by polling points in the runtime. You can also add additional
polling points explicitly if needed in your application via
This section summarizes which combinations of threads and exception support are supplied on various GNAT platforms.
|• Summary of Run-Time Configurations:|