On Friday 06 August 2004 13:45, Bruno Tavares wrote:
> Which reminds me of something: we are currently implementing the ability
> to stop a burning process.
The most difficult part in my case :-)
> I noticed that you have some special methods that freevo is supposed to
> call in order to shutdown a instance of your plugin. Can you please tell
> me which ones are methods with that purpose and in which occasions
> freevo calls them?
Just define a method called 'shutdown' in your plugin interface and freevo
calls it automatically at shutdown. In my case, this shutdown method calls a
shutdown method in my thread to terminate it silently.
> Thanks for all the time saving in threads coding ;)
Some notes about thread/child handling in freevo :
- All childs spawned in a thread must be spawn by the main thread in order to
keep control on it (freevo has a workaround by sending an event
OS_EVENT_POPEN2 to the main thread in util/popen3.py)
- When you spawn a child with pipes (|), python spawns a shell with a subshell
for each pipe : you loose control over these subshells. The only 'clean' way
I found of doing this, is to force the spawned shell to be a process group
leader. I achieve this by adding to util/popen3.py the line :
os.setpgid(0, os.getpid())
Then you can kill the whole process tree created by the shell...
I tried not to use pipes directly in child processes, but the way python is
handling pipes is too complicated in my case (I have a lot of pipes) and the
code becomes quickly unreadable...
If someone has a clean method to spawn multiple commands in pipes in python, I
would be happy to convert my code to the python way...
Good luck,
Nicolas.
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