2012/2/23 Wu Ting
<address@hidden>
Hi! Thank you for your response. I've kept working on this problem for two
days, but still cannot find a way to solve it.
I simplified the program and have determined that the 'O' is produced is
this while loop:
while msgCount<10000:
msg = tb.queue.delete_head()
payload = msg.to_string()
f.write(payload)
msgCount += 1
I also tried to make it sleep for a short time after each operation:
while msgCount<10000:
msg = tb.queue.delete_head()
sleep(0.00001)
payload = msg.to_string()
sleep(0.00001)
f.write(payload)
sleep(0.00001)
msgCount += 1
Two quick things. First, the tb.queue.delete_head() is a blocking call, so it will wait until there is a message to process. You don't need to sleep. Adding a sleep call here is probably only making things worse since you're already not keeping up with the samples. Second, the sleep() call is generally only accurate to about ~10 ms, but you're asking it to sleep for 10 us. I'm not sure if it rounds up or down. Worse case, you're making the loop sleep for about 30 ms total; best case is you actually aren't pausing at all.
Tom