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Hi max,
Thanks for the below.
So when a client does a WSASend(..) , does the
WSASend(..) functuion add the size of packet before it sends the
data?
Neil
----- Original Message -----
Sent: Sunday, December 05, 2004 10:22
AM
Subject: Re: [msvc] IO Completion
Port
HI
Hi,
I am about to write server code for
a GPRS connection. I was wondering when does the IO Completion port worker
thread get the information? For example, if the server sends out a request
to the GPRS system to send 50 bytes (which it does), how does the IO
Completion port knows how much data to read before informing a worker
thread?.
As far as I understand what you are asking, the
IOCP calls the CALLBACK function when it has some data to read in. This
data may (mostly likely) will not be the whole packet of information.
Its up to you to place a number as the first part of the packet to tell the
receiving prog how big the packet is. It is then up to your program to
keep reading the data from the port until it has a whole packet with which it
can do something.
Does the IO Completion port call a
working thread when there is a timeout after the first character is read
(and if the buffer is full)? As the worker thread doesn't get called when
each byte is received.
I didn't think IOCP did timeouts.
Max
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