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At least for Linux, we can use signalfd(2) and the runtime network poller
to wait for SIGCHLD without a new thread. On BSD, we could use kqueue(2)
with NOTE_EXIT.
See moby/moby#11529
There's no reasons why Docker should have to work around the standard library to reduce their thread count with large numbers of processes.
We could make
os/exec.Cmd.Wait
efficient instead./cc @ianlancetaylor
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