Hi Ross,
> The read and write
routines should be accessing different memory buffers at all times, and this
seems to be the case when no seek is done. It all works fine.
This sort of assumption is dangerous when dealing with threads. :-)
Without knowing what
InterlockedExchangeAdd(@FBufferSize,Len);
does, but suspecting that this is where the buffer information is
updated and stored, then I suspect that this is the source of your problem.
I would suggest that you put the same critical section around this
call only in both the read and write routines. This allows both to
do most of their work independantly, but forces them to converse
before accessing the buffer information.
Someone once explained to me that even if it's a single byte of
information that is exchanged, you have to assume that this memory
location is undefined in the middle of being updated, and that it
could be at just this instant of time that the threads are
swapped. Assuming such has always stood me in good stead when
writing threaded code.
Cheers,
Chris.
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