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Commit1a8aa64

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Setup SIGUSR1 procsignal_sigusr1_handler handler.
This is normally automatically done when a bgworker declares theBGWORKER_BACKEND_DATABASE_CONNECTION flag, but our bgworker doesn't connect todatabases, even though it calls InitPostgres, which will still initialize a newbacckend and thus participate to the ProcSignal infrastructure.This wasn't a problem until recently, but now that DROP DATABASE relies onPROCSIG_BARRIER to work on Windows (see commit4eb2176318d0561846c1f9fb3c68bede799d640f) we need to respond to ProcSignalnotifications.
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‎collector.c

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@@ -339,8 +339,16 @@ collector_main(Datum main_arg)
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* any equivalent of the backend's command-read loop, where interrupts can
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* be processed immediately, so make sure ImmediateInterruptOK is turned
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* off.
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*
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* We also want to respond to the ProcSignal notifications. This is done
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* in the upstream provided procsignal_sigusr1_handler, which is
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* automatically used if a bgworker connects to a database. But since our
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* worker doesn't connect to any database even though it calls
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* InitPostgres, which will still initializze a new backend and thus
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* partitipate to the ProcSignal infrastructure.
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*/
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pqsignal(SIGTERM,handle_sigterm);
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pqsignal(SIGUSR1,procsignal_sigusr1_handler);
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BackgroundWorkerUnblockSignals();
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#ifPG_VERSION_NUM >=110000
@@ -379,6 +387,9 @@ collector_main(Datum main_arg)
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boolwrite_history,
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write_profile;
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/* We need an explicit call for at least ProcSignal notifications. */
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CHECK_FOR_INTERRUPTS();
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/* Wait calculate time to next sample for history or profile */
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current_ts=GetCurrentTimestamp();
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