pmsignal.h 2.1 KB

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  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. * Reasons for signaling the postmaster. We can cope with simultaneous
  18. * signals for different reasons. If the same reason is signaled multiple
  19. * times in quick succession, however, the postmaster is likely to observe
  20. * only one notification of it. This is okay for the present uses.
  21. */
  22. typedef enum
  23. {
  24. PMSIGNAL_RECOVERY_STARTED, /* recovery has started */
  25. PMSIGNAL_BEGIN_HOT_STANDBY, /* begin Hot Standby */
  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. PMSIGNAL_BACKGROUND_WORKER_CHANGE, /* background worker state change */
  31. PMSIGNAL_START_WALRECEIVER, /* start a walreceiver */
  32. PMSIGNAL_ADVANCE_STATE_MACHINE, /* advance postmaster's state machine */
  33. NUM_PMSIGNALS /* Must be last value of enum! */
  34. } PMSignalReason;
  35. /* PMSignalData is an opaque struct, details known only within pmsignal.c */
  36. typedef struct PMSignalData PMSignalData;
  37. /*
  38. * prototypes for functions in pmsignal.c
  39. */
  40. extern Size PMSignalShmemSize(void);
  41. extern void PMSignalShmemInit(void);
  42. extern void SendPostmasterSignal(PMSignalReason reason);
  43. extern bool CheckPostmasterSignal(PMSignalReason reason);
  44. extern int AssignPostmasterChildSlot(void);
  45. extern bool ReleasePostmasterChildSlot(int slot);
  46. extern bool IsPostmasterChildWalSender(int slot);
  47. extern void MarkPostmasterChildActive(void);
  48. extern void MarkPostmasterChildInactive(void);
  49. extern void MarkPostmasterChildWalSender(void);
  50. extern bool PostmasterIsAlive(void);
  51. #endif /* PMSIGNAL_H */