I am trying to record sound from a Delta 1010LT.
To avoid preemptive problems, I am using the approach of running two
pthreads to acquire the data. Each thread should perform a read() (In the
regular syscall read interface) on the data. The file descriptor is opened
before the pthread call (In order to be shared by both threads). I was
expecting the driver to queue the requests so that each one would be
awaken when data was ready (and the other thread would have a huge amount
of time to queue another data request)...
Unfortunatelly what is happening is that I am receiving a mix of samples
between the two read syscalls...
Is there some flag, some update, something I should add to my procedures
to be able to use this approach?! In order to clear things, here is a
model of how I am doing it :
void* routine (void* arg){
while(1) {
read(dsp_fd, buffer, nbtyes);
}
}
int main (void){
pthread_create(th1, (SCHED_FIFO 99 ),routine, NULL);
pthread_create(th2, (SCHED_FIFO 99 ),routine, NULL);
sleep(10);
}
Thanks a lot for any suggestions,
Denis Damazio
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