Way wrote:
Hello friends,
I have a little messy situation on IPC. Please if you can, give me
some suggestion on how to implement. Thanks a lot!
-> denotes create
MainProcess -> Process1 -> Process3 (from os.system)
|
-> Process2 (from os.system) -> Process4 (from
os.system) ->Process5
I would like to make the communication between Process1 and Process5.
Process1 needs Process5's output to provide argument to generate
Process3, and in turn Process5 needs to wait Process3 finished.
Thank you very much if you can give a hint.
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=====================================
My first reaction is to use named pipes.
Process1 -> P2 -> P4 -> Process5 >>NamedPipe (P5 outputs to NamedPipe)
Process1 waits for NamedPipe to be made and starts creating Process3
When Process3 is finished it can set an OS level environmental or
create a dummy file as a signal to Process5 to finish.
P1 becomes orchestrator, NamedPipe is courier, file is smoke signal.
This method works when IPC is not a good choice. (Like independent child
processes run across the net. A specific file in a specific location
effectively creates a specific signal. Whether or not contents are used
or even existing is programmer choice.)
Hope this helps.
Steve
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