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- /*-------------------------------------------------------------------------
- *
- * pmsignal.h
- * routines for signaling the postmaster from its child processes
- *
- *
- * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * src/include/storage/pmsignal.h
- *
- *-------------------------------------------------------------------------
- */
- #ifndef PMSIGNAL_H
- #define PMSIGNAL_H
- /*
- * Reasons for signaling the postmaster. We can cope with simultaneous
- * signals for different reasons. If the same reason is signaled multiple
- * times in quick succession, however, the postmaster is likely to observe
- * only one notification of it. This is okay for the present uses.
- */
- typedef enum
- {
- PMSIGNAL_RECOVERY_STARTED, /* recovery has started */
- PMSIGNAL_BEGIN_HOT_STANDBY, /* begin Hot Standby */
- PMSIGNAL_WAKEN_ARCHIVER, /* send a NOTIFY signal to xlog archiver */
- PMSIGNAL_ROTATE_LOGFILE, /* send SIGUSR1 to syslogger to rotate logfile */
- PMSIGNAL_START_AUTOVAC_LAUNCHER, /* start an autovacuum launcher */
- PMSIGNAL_START_AUTOVAC_WORKER, /* start an autovacuum worker */
- PMSIGNAL_BACKGROUND_WORKER_CHANGE, /* background worker state change */
- PMSIGNAL_START_WALRECEIVER, /* start a walreceiver */
- PMSIGNAL_ADVANCE_STATE_MACHINE, /* advance postmaster's state machine */
- NUM_PMSIGNALS /* Must be last value of enum! */
- } PMSignalReason;
- /* PMSignalData is an opaque struct, details known only within pmsignal.c */
- typedef struct PMSignalData PMSignalData;
- /*
- * prototypes for functions in pmsignal.c
- */
- extern Size PMSignalShmemSize(void);
- extern void PMSignalShmemInit(void);
- extern void SendPostmasterSignal(PMSignalReason reason);
- extern bool CheckPostmasterSignal(PMSignalReason reason);
- extern int AssignPostmasterChildSlot(void);
- extern bool ReleasePostmasterChildSlot(int slot);
- extern bool IsPostmasterChildWalSender(int slot);
- extern void MarkPostmasterChildActive(void);
- extern void MarkPostmasterChildInactive(void);
- extern void MarkPostmasterChildWalSender(void);
- extern bool PostmasterIsAlive(void);
- #endif /* PMSIGNAL_H */
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