New submission from Thomas Moreau <[email protected]>:
The current implementation of the semaphore_tracker creates a new process for
each children.
The easy fix would be to pass the _pid to the children but the current
mechanism to check if the semaphore_tracker is alive relies on waitpid which
cannot be used in child processes (the semaphore_tracker is only a sibling of
these processes). The main issue is to have a reliable check that either:
The pipe is open. This is what is done here by sending a message. I don't
know if there is a more efficient way to check it.
Check that a given pid is alive. As we cannot rely on waitpid, I don't see
an efficient mechanism.
I propose to add a PROBE command in the semaphore tracker. When the pipe is
closed, the send command will fail, meaning that the semaphore tracker is down.
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components: Library (Lib)
messages: 340543
nosy: tomMoral
priority: normal
severity: normal
status: open
title: semaphore_tracker is not reused by child processes
type: behavior
versions: Python 3.8
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<https://bugs.python.org/issue36668>
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