Il 31/12/2020 22:43, Cameron Simpson ha scritto:
On 31Dec2020 18:07, jak <nos...@please.ty> wrote:
Il 31/12/2020 11:43, Petro ha scritto:
I would like to make something like this:
A python script would run headlessly in the background.
I would like to control the script from the command line using other python
scripts or from the python shell.
From time to time I would ask the main script to create a popup window with an
image or a plot.
What would be the proper way to approach it. How to make communication between
two scripts?
using named pipes would be an alternative. A small example that
produces an echo for windows.
A Windows named pipe seems to be more like a UNIX-side "UNIX domain
socket" than a UNIX side "named pipe".
For linux it's simpler using os.mkfifo:
Not really. For Linux (and of course other UNIXen) you really want a
UNIX domain socket, not a a name pipe (as from mkfifo).
The reason is that a socket (and a Windows pipe, from my limited
understanding) creates a new distinct connection when you open it. (The
other end has to accept that connection, at least in UNIX).
-----------------
The problem with a UNIX pipe is that every client (your command line
control script) _share_ the same pipe - if two scripts un at once there
will be a failure. If you contrive some locking scheme then you can
share a named pipe in UNIX because only once client will use the pipe at
a time.
This is not completely true, in fact requests can be queued as they
would be with sockets and it is their real job. The most important
difference is that sockets are a limited resource on a system.
Just something to keep in mind.
Cheers,
Cameron Simpson <c...@cskk.id.au>
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