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continuously, and requests vacuum runs of "autovacuum workers" to postmaster. The workers do the actual vacuum work. This allows for future improvements, like allowing multiple autovacuum jobs running in parallel. For now, the code keeps the original behavior of having a single autovac process at any time by sleeping until the previous worker has finished.
44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* pmsignal.h
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* routines for signaling the postmaster from its child processes
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*
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*
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/storage/pmsignal.h,v 1.17 2007/02/15 23:23:23 alvherre Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PMSIGNAL_H
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#define PMSIGNAL_H
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/*
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* Reasons for signaling the postmaster. We can cope with simultaneous
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* signals for different reasons. If the same reason is signaled multiple
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* times in quick succession, however, the postmaster is likely to observe
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* only one notification of it. This is okay for the present uses.
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*/
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typedef enum
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{
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PMSIGNAL_PASSWORD_CHANGE, /* pg_auth file has changed */
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PMSIGNAL_WAKEN_CHILDREN, /* send a SIGUSR1 signal to all backends */
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PMSIGNAL_WAKEN_ARCHIVER, /* send a NOTIFY signal to xlog archiver */
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PMSIGNAL_ROTATE_LOGFILE, /* send SIGUSR1 to syslogger to rotate logfile */
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PMSIGNAL_START_AUTOVAC_LAUNCHER, /* start an autovacuum launcher */
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PMSIGNAL_START_AUTOVAC_WORKER, /* start an autovacuum worker */
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NUM_PMSIGNALS /* Must be last value of enum! */
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} PMSignalReason;
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/*
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* prototypes for functions in pmsignal.c
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*/
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extern void PMSignalInit(void);
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extern void SendPostmasterSignal(PMSignalReason reason);
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extern bool CheckPostmasterSignal(PMSignalReason reason);
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extern bool PostmasterIsAlive(bool amDirectChild);
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#endif /* PMSIGNAL_H */
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