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55 lines
2 KiB
C
55 lines
2 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) 1996-2011, 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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* src/include/storage/pmsignal.h
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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_RECOVERY_STARTED, /* recovery has started */
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PMSIGNAL_BEGIN_HOT_STANDBY, /* begin Hot Standby */
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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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PMSIGNAL_START_WALRECEIVER, /* start a walreceiver */
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PMSIGNAL_ADVANCE_STATE_MACHINE, /* advance postmaster's state machine */
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NUM_PMSIGNALS /* Must be last value of enum! */
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} PMSignalReason;
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/* PMSignalData is an opaque struct, details known only within pmsignal.c */
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typedef struct PMSignalData PMSignalData;
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/*
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* prototypes for functions in pmsignal.c
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*/
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extern Size PMSignalShmemSize(void);
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extern void PMSignalShmemInit(void);
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extern void SendPostmasterSignal(PMSignalReason reason);
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extern bool CheckPostmasterSignal(PMSignalReason reason);
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extern int AssignPostmasterChildSlot(void);
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extern bool ReleasePostmasterChildSlot(int slot);
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extern bool IsPostmasterChildWalSender(int slot);
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extern void MarkPostmasterChildActive(void);
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extern void MarkPostmasterChildInactive(void);
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extern void MarkPostmasterChildWalSender(void);
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extern bool PostmasterIsAlive(bool amDirectChild);
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#endif /* PMSIGNAL_H */
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