src/include/storage/pmsignal.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * pmsignal.h
   4  *        routines for signaling the postmaster from its child processes
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * $PostgreSQL$
  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_PASSWORD_CHANGE,       /* pg_auth file has changed */
  26         PMSIGNAL_WAKEN_ARCHIVER,        /* send a NOTIFY signal to xlog archiver */
  27         PMSIGNAL_ROTATE_LOGFILE,        /* send SIGUSR1 to syslogger to rotate logfile */
  28         PMSIGNAL_START_AUTOVAC_LAUNCHER,        /* start an autovacuum launcher */
  29         PMSIGNAL_START_AUTOVAC_WORKER,          /* start an autovacuum worker */
  30
  31         NUM_PMSIGNALS                           /* Must be last value of enum! */
  32 } PMSignalReason;
  33
  34 /*
  35  * prototypes for functions in pmsignal.c
  36  */
  37 extern void PMSignalInit(void);
  38 extern void SendPostmasterSignal(PMSignalReason reason);
  39 extern bool CheckPostmasterSignal(PMSignalReason reason);
  40 extern bool PostmasterIsAlive(bool amDirectChild);
  41
  42 #endif   /* PMSIGNAL_H */