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Philippe Wicker wrote:
Can you tell us some more about the threads that are involved: who is
the signaling thread? How (when) do you decide to signal the waiter?
Are there several synchronization points in the waiter thread? What
thread is sending the midi note?
This only started occuring after upgrading to Panther from Jaguar. I
am after a 5ms resolution. Can Panther offer me this reliably using
POSIX threads?
The OS X scheduler can give very sharp resolution using
cond_timedwait, a 5ms resolution (and even much better) is possible.
Now the point is how is the midi note sender thread scheduled: is it a
time shared or a real time thread? If time shared, did you give it the
default priority or did you try to boost its priority? What is the
amount of work it has to execute when it wakes up?
I can actually see what is happening by putting the following diagnostic in
while (!exit_schedule)
{
unsigned expected_callback = Scheduler::getTime() + wait_interval;
printf("Wait %u\r\n", wait_interval);
printf ("Expect call %u\r\n", expected_callback);
schedule_event->Wait (wait_interval);
int call_time = Scheduler::getTime();
printf ("Event Late by %u\r\n", call_time - expected_callback);
Before my GUI displays objects, I get a late time of between 1 and 5,
which is quite acceptable.
When My objects are displayed and I start the MIDI notes, I start
getting longer delays. If I minimise my GUI, the timing is rock solid
again. This means that it must have to do with the way I am implementing
the update in Java in that it is not giving my pthreads enough priority.
There are those who seek knowledge for the sake of knowledge - that is CURIOSITY
There are those who seek knowledge to be known by others - that is VANITY
There are those who seek knowledge in order to serve - that is LOVE
Bernard of Clairvaux (1090 - 1153)
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