feat(process): distinguish between signals used to kill children #10049
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chris-olszewski
commented
Feb 28, 2025
| child.stop().await.ok(); | ||
| }; | ||
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| let (_, code) = join! { |
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With the lack of state, we no longer need to drive both futures to completion at the same time. Sending the stop command will complete:
- Once the child manager reads the command from the channel
- If the child manager exits and closes the command channel
After either of these we can wait for the exit code to be reported:
- If the stop command was read, then the child manager will update the exit status based on the outcome of issuing the command
- If the stop command was dropped, then the child manager has exited and will have dropped the sender for the exit status channel. If the sender for a watch channel is dropped then
changed()will exit.
NicholasLYang
approved these changes
Mar 12, 2025
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Description
This is a redo of #10027 with some additional refactoring to reduce the complexity of this code. These changes should lessens the possibilities of deadlock or race conditions.
I highly recommend viewing each commit individually.
From original PR:
The additional commits in this PR:
waits performed by theChildStateManagerwhere one was called by the task the sent a shutdown to the child and the other was the defaultwait. If the latter won, then it would appear another entity killed the child even when it was really us.ShutdownStyle::processto avoid returning an impossible stateChildState::Exitedfield which was never readThe removal of the shared state is possible since we already have the exit channel shared between the handles and the manager. Using both a channel and state was error prone as it lead to the following possibilities:
Instead we only use the command channel being open/closed as an indication of if the child is running. Once the manager sees the child exit, it will send the exit status via the channel and exit resulting in the channel being closed.
Testing Instructions
Existing test suite, ran with
hyperfine 'cargo test' -r 500to attempt to flush out any races.