# Using named pipe to communicate between flow graphs

**URL:** <https://www.ruby-forum.com/t/using-named-pipe-to-communicate-between-flow-graphs/230858>\
**Category:** GNU Radio\
**Created:** [July 8, 2014, 11:49pm UTC](https://www.ruby-forum.com/t/using-named-pipe-to-communicate-between-flow-graphs/230858 "2014-07-08T23:49:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [July 8, 2014, 11:49pm UTC](https://www.ruby-forum.com/t/using-named-pipe-to-communicate-between-flow-graphs/230858/1 "2014-07-08T23:49:49Z")

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Hi,

I’m trying to pass IQ data stream from one flow graph to another.  
Following is the description of the flow graphs-  
FlowGraph 1 - Sender  
Signal Source (samp-10M;freq-8M) TO 1.file sink(to named pipe)  
2.GUI FFT sink  
3.GUI Scope sink

FlowGraph 2 - Receive  
File Source(from named pipe) TO 1.GUI FFT sink  
2.GUI Scope sink  
channel.bin is the named pipe I created with mkfifo command.

The IQ stream is not being received at the receiver consistently.  
It works out correctly few times…However, sometimes, the sender OR  
receiver OR both SCOPE windows might not show the scope display.  
Thing to note is, GUI FFT in both sender and receiver works fine every  
time.

What might be the reason ??