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| From: | Eugene Grayver |
| Subject: | [Discuss-gnuradio] Bug in GR runtime related to lock/unlock and tag propagation |
| Date: | Wed, 16 Nov 2016 18:55:35 +0000 |
|
Hello,
I came across a nasty bug in the runtime. It has something to do with the tag pruning code after a flowgraph is reconfigured. My guess is that some counter is not being reset, even though the output buffer is reset. It is easy to demonstrate by hooking up a usrp_source to tag_debug. usrp_source inserts tags but they are not seen by the tag_debug (after the first time).
Here's a full python example script.
------------------------ from gnuradio import gr, blocks, uhd
import time
top = gr.top_block()
src = "" uhd.stream_args('fc32'))
dbg = blocks.tag_debug(gr.sizeof_gr_complex,'A')
top.connect(src, dbg)
top.start()
for idx in range(10):
time.sleep(5)
top.lock()
top.disconnect(src, dbg)
# Tags are lost whether we reuse the same dbg or create a new one
#dbg = blocks.tag_debug(gr.sizeof_gr_complex,'A%d' % idx)
top.connect(src, dbg)
top.unlock()
top.stop()
top.wait()
---------------------------
________________________ Eugene Grayver, Ph.D. |
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