On 03/09/2020 14:54, Bo Berglund via fpc-pascal wrote:
Now to my question:
Is there some *example* around for using TLazThreadedQueue as a
circular buffer?
In the examples dir are only examples for LazUnicode and
LookUpStringList...
And when reading the sources I cannot really say I understand what it
does or how it works.
Is it even applicable for storing data such as a sequence of bytes
arriving via a serial port?
The names PushItem and PopItem really suggest it works like a LIFO
buffer rather than a FIFO buffer, which is what I need...
LIFO: Last In First Out, like how a stack works
FIFO: First In First Out, like a tube where the items reside for a
while but come out in orderly sequence.
It is FIFO. Its a queue, not a stack.
Look at my latest commits in Trunk to fpdebug > FpDbgUtil
I use the queue there.
Note:
- Calling "grow" when the buffer is NOT empty, works in latest trunk only.
Actually you want that fix anyway, because on Win there is a race
condition, that could starve individual threads.
r 63811 and 63833 (must take both / I introduced a silly type in the first)
- Calling shutdown (to stop all threads from waiting), may also not
work, if there are many threads (at least on win). But the fix is in
trunk, and easy to port. r 63860
You need a type (e.g. class, or array, or pointer) that you can then push.
So if you get bytes from an input, I suggest you push collected chunks
of them (fixed or dynamic size).
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