Michael Schnell wrote:
On 09/29/2010 01:26 PM, Mark Morgan Lloyd wrote:
But the serial does allow you access to the handle, so it's trivial to
use select() (actually fpSelect()) to implement the timeout.
Is spSelect() portable / Cross-Platform ?
It certainly is in the context of socket programming, I've not checked-
yet- the situation with serial ports and general files.
However if I recall correctly low-level Windows read and write syscalls
have their own timeout parameters, so the correct thing would be to wrap
(for example) serial.pp and TComPort in a mid-level object and then
implement things like event notification at that level.
interface based on functions and Object Pascal Events that (if not
especially stated in the docs) are fired in the context of the main
thread.
I agree. But on the other hand I think it's a mistake to write low-level
support with too many embedded assumptions, using serial comms for
illustration you might want events to go to the main thread if writing a
terminal emulator but not if writing a multithreaded store-and-forward
server.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
--
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