init

pg_include/commands/async.h

@@ -0,0 +1,59 @@
+/*-------------------------------------------------------------------------
+ *
+ * async.h
+ *	  Asynchronous notification: NOTIFY, LISTEN, UNLISTEN
+ *
+ * Portions Copyright (c) 1996-2012, 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 "fmgr.h"
+
+/*
+ * The number of SLRU page buffers we use for the notification queue.
+ */
+#define NUM_ASYNC_BUFFERS	8
+
+extern bool Trace_notify;
+
+extern Size AsyncShmemSize(void);
+extern void AsyncShmemInit(void);
+
+/* 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);
+
+/* notify-related SQL functions */
+extern Datum pg_listening_channels(PG_FUNCTION_ARGS);
+extern Datum pg_notify(PG_FUNCTION_ARGS);
+
+/* 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 AtSubStart_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);
+
+/*
+ * enable/disable processing of inbound notifies directly from signal handler.
+ * The enable routine first performs processing of any inbound notifies that
+ * have occurred since the last disable.
+ */
+extern void EnableNotifyInterrupt(void);
+extern bool DisableNotifyInterrupt(void);
+
+#endif   /* ASYNC_H */