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pg_include/storage/pmsignal.h

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+/*-------------------------------------------------------------------------
+ *
+ * pmsignal.h
+ *	  routines for signaling the postmaster from its child processes
+ *
+ *
+ * Portions Copyright (c) 1996-2012, 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_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 */