1 /*------------------------------------------------------------------------- 2 * 3 * pmsignal.h 4 * routines for signaling the postmaster from its child processes 5 * 6 * 7 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group 8 * Portions Copyright (c) 1994, Regents of the University of California 9 * 10 * src/include/storage/pmsignal.h 11 * 12 *------------------------------------------------------------------------- 13 */ 14 #ifndef PMSIGNAL_H 15 #define PMSIGNAL_H 16 17 /* 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. 22 */ 23 typedef enum 24 { 25 PMSIGNAL_RECOVERY_STARTED, /* recovery has started */ 26 PMSIGNAL_BEGIN_HOT_STANDBY, /* begin Hot Standby */ 27 PMSIGNAL_WAKEN_ARCHIVER, /* send a NOTIFY signal to xlog archiver */ 28 PMSIGNAL_ROTATE_LOGFILE, /* send SIGUSR1 to syslogger to rotate logfile */ 29 PMSIGNAL_START_AUTOVAC_LAUNCHER, /* start an autovacuum launcher */ 30 PMSIGNAL_START_AUTOVAC_WORKER, /* start an autovacuum worker */ 31 PMSIGNAL_BACKGROUND_WORKER_CHANGE, /* background worker state change */ 32 PMSIGNAL_START_WALRECEIVER, /* start a walreceiver */ 33 PMSIGNAL_ADVANCE_STATE_MACHINE, /* advance postmaster's state machine */ 34 35 NUM_PMSIGNALS /* Must be last value of enum! */ 36 } PMSignalReason; 37 38 /* PMSignalData is an opaque struct, details known only within pmsignal.c */ 39 typedef struct PMSignalData PMSignalData; 40 41 /* 42 * prototypes for functions in pmsignal.c 43 */ 44 extern Size PMSignalShmemSize(void); 45 extern void PMSignalShmemInit(void); 46 extern void SendPostmasterSignal(PMSignalReason reason); 47 extern bool CheckPostmasterSignal(PMSignalReason reason); 48 extern int AssignPostmasterChildSlot(void); 49 extern bool ReleasePostmasterChildSlot(int slot); 50 extern bool IsPostmasterChildWalSender(int slot); 51 extern void MarkPostmasterChildActive(void); 52 extern void MarkPostmasterChildInactive(void); 53 extern void MarkPostmasterChildWalSender(void); 54 extern bool PostmasterIsAlive(void); 55 56 #endif /* PMSIGNAL_H */ 57