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/*------------------------------------------------------------------------- * * async.h * Asynchronous notification: NOTIFY, LISTEN, UNLISTEN * * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/commands/async.h * *------------------------------------------------------------------------- */ #ifndef ASYNC_H #define ASYNC_H #include <signal.h> extern PGDLLIMPORT bool Trace_notify; extern PGDLLIMPORT int max_notify_queue_pages; extern PGDLLIMPORT volatile sig_atomic_t notifyInterruptPending; extern Size AsyncShmemSize(void); extern void AsyncShmemInit(void); extern void NotifyMyFrontEnd(const char *channel, const char *payload, int32 srcPid); /* notify-related SQL statements */ extern void Async_Notify(const char *channel, const char *payload); extern void Async_Listen(const char *channel); extern void Async_Unlisten(const char *channel); extern void Async_UnlistenAll(void); /* perform (or cancel) outbound notify processing at transaction commit */ extern void PreCommit_Notify(void); extern void AtCommit_Notify(void); extern void AtAbort_Notify(void); extern void AtSubCommit_Notify(void); extern void AtSubAbort_Notify(void); extern void AtPrepare_Notify(void); /* signal handler for inbound notifies (PROCSIG_NOTIFY_INTERRUPT) */ extern void HandleNotifyInterrupt(void); /* process interrupts */ extern void ProcessNotifyInterrupt(bool flush); /* freeze old transaction IDs in notify queue (called by VACUUM) */ extern void AsyncNotifyFreezeXids(TransactionId newFrozenXid); #endif /* ASYNC_H */