init

db_include/commands/async.h

@@ -0,0 +1,54 @@
+/*-------------------------------------------------------------------------
+ *
+ * async.h
+ *	  Asynchronous notification: NOTIFY, LISTEN, UNLISTEN
+ *
+ * Portions Copyright (c) 1996-2021, 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>
+
+/*
+ * The number of SLRU page buffers we use for the notification queue.
+ */
+#define NUM_NOTIFY_BUFFERS	8
+
+extern bool Trace_notify;
+extern 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);
+extern void ProcessCompletedNotifies(void);
+
+/* signal handler for inbound notifies (PROCSIG_NOTIFY_INTERRUPT) */
+extern void HandleNotifyInterrupt(void);
+
+/* process interrupts */
+extern void ProcessNotifyInterrupt(bool flush);
+
+#endif							/* ASYNC_H */