1 /*-------------------------------------------------------------------------
4 * routines for signaling the postmaster from its child processes
7 * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
8 * Portions Copyright (c) 1994, Regents of the University of California
10 * $PostgreSQL: pgsql/src/include/storage/pmsignal.h,v 1.26 2009/08/29 19:26:52 tgl Exp $
12 *-------------------------------------------------------------------------
18 * Reasons for signaling the postmaster. We can cope with simultaneous
19 * signals for different reasons. If the same reason is signaled multiple
20 * times in quick succession, however, the postmaster is likely to observe
21 * only one notification of it. This is okay for the present uses.
25 PMSIGNAL_RECOVERY_STARTED, /* recovery has started */
26 PMSIGNAL_RECOVERY_CONSISTENT, /* recovery has reached consistent
28 PMSIGNAL_WAKEN_ARCHIVER, /* send a NOTIFY signal to xlog archiver */
29 PMSIGNAL_ROTATE_LOGFILE, /* send SIGUSR1 to syslogger to rotate logfile */
30 PMSIGNAL_START_AUTOVAC_LAUNCHER, /* start an autovacuum launcher */
31 PMSIGNAL_START_AUTOVAC_WORKER, /* start an autovacuum worker */
33 NUM_PMSIGNALS /* Must be last value of enum! */
36 /* PMSignalData is an opaque struct, details known only within pmsignal.c */
37 typedef struct PMSignalData PMSignalData;
40 * prototypes for functions in pmsignal.c
42 extern Size PMSignalShmemSize(void);
43 extern void PMSignalShmemInit(void);
44 extern void SendPostmasterSignal(PMSignalReason reason);
45 extern bool CheckPostmasterSignal(PMSignalReason reason);
46 extern int AssignPostmasterChildSlot(void);
47 extern bool ReleasePostmasterChildSlot(int slot);
48 extern void MarkPostmasterChildActive(void);
49 extern void MarkPostmasterChildInactive(void);
50 extern bool PostmasterIsAlive(bool amDirectChild);
52 #endif /* PMSIGNAL_H */