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worker: add a SIGCHLD handler to collect worker immediately...
worker: add a SIGCHLD handler to collect worker immediately As planned by previous patches, add a SIGCHLD handler to get notifications about worker exits, and deals with worker failure immediately. Note that the SIGCHLD handler gets unregistered before killworkers(), so SIGCHLD won't interrupt "killworkers" - making it harder to send kill signals to waited processes.
Jun Wu -
r30415:e8fb03cf default
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