| Commit message (Collapse) | Author | Age |
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If the process is killed by a signal, preserve the exit code as it would
be reported by $?.
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I learned about this flag on my previous job; basically, it should be
enabled by default IMO, so that the thread doesn't receive signals from
other threads' children.
Here, it doesn't matter too much, since we're waiting for a specific
child. However, if we were to use waitpid(-1, ...), it would be
essential to use this flag. Still, even here, it's good to have this on.
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Found when running in Docker.
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Previously, I had a stupid system where I would create a thread after
every accept(), and put worker descriptors in a queue. A special
"scheduler" thread would then pick them out, and give out jobs to
complete.
The problem was, of course, I couldn't conveniently poll job status from
workers. I thought about using poll(), but that turned out to be a
horribly complicated API. How do I deal with partial reads, for example?
I don't honestly know.
Then it hit me that I could just use the threads that handle accept()ed
connections as "worker threads", which would synchronously schedule jobs
and wait for them to complete. This solves every problem and removes the
need for a lot of inter-thread synchronization magic. It even works now,
holy crap! You can launch and terminate workers at will, and they will
pick up new jobs automatically.
As a side not, msg_recv_and_handle turned out to be too limiting and
complicated for me, so I got rid of that, and do normal
msg_recv/msg_send calls.
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This adds a basic "worker" program.
You can now do something like
./server &
./worker &
./client ci_run URL REV
and the server should pass a message to worker, after which it should
clone the repository at URL, checkout REV, and try to run the CI script.
It's extremely unfinished: I need to sort out the graceful shutdown, how
the server manages workers, etc.
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