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Allow discovery of whether a dynamic background worker is running.

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Using the infrastructure provided by this patch, it's possible either
to wait for the startup of a dynamically-registered background worker,
or to poll the status of such a worker without waiting.  In either
case, the current PID of the worker process can also be obtained.
As usual, worker_spi is updated to demonstrate the new functionality.

Patch by me.  Review by Andres Freund.
This commit is contained in:
Robert Haas
2013-08-28 14:08:13 -04:00
parent c9e2e2db5c
commit 090d0f2050
12 changed files with 367 additions and 12 deletions
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1
src/include/storage/procsignal.h
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@@ -54,5 +54,6 @@ extern int SendProcSignal(pid_t pid, ProcSignalReason reason,
BackendId backendId);
extern void procsignal_sigusr1_handler(SIGNAL_ARGS);
extern bool set_latch_on_sigusr1;
#endif /* PROCSIGNAL_H */