init

db_include/replication/walsender.h

@@ -0,0 +1,74 @@
+/*-------------------------------------------------------------------------
+ *
+ * walsender.h
+ *	  Exports from replication/walsender.c.
+ *
+ * Portions Copyright (c) 2010-2021, PostgreSQL Global Development Group
+ *
+ * src/include/replication/walsender.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef _WALSENDER_H
+#define _WALSENDER_H
+
+#include <signal.h>
+
+/*
+ * What to do with a snapshot in create replication slot command.
+ */
+typedef enum
+{
+	CRS_EXPORT_SNAPSHOT,
+	CRS_NOEXPORT_SNAPSHOT,
+	CRS_USE_SNAPSHOT
+} CRSSnapshotAction;
+
+/* global state */
+extern bool am_walsender;
+extern bool am_cascading_walsender;
+extern bool am_db_walsender;
+extern bool wake_wal_senders;
+
+/* user-settable parameters */
+extern int	max_wal_senders;
+extern int	wal_sender_timeout;
+extern bool log_replication_commands;
+
+extern void InitWalSender(void);
+extern bool exec_replication_command(const char *query_string);
+extern void WalSndErrorCleanup(void);
+extern void WalSndResourceCleanup(bool isCommit);
+extern void WalSndSignals(void);
+extern Size WalSndShmemSize(void);
+extern void WalSndShmemInit(void);
+extern void WalSndWakeup(void);
+extern void WalSndInitStopping(void);
+extern void WalSndWaitStopping(void);
+extern void HandleWalSndInitStopping(void);
+extern void WalSndRqstFileReload(void);
+
+/*
+ * Remember that we want to wakeup walsenders later
+ *
+ * This is separated from doing the actual wakeup because the writeout is done
+ * while holding contended locks.
+ */
+#define WalSndWakeupRequest() \
+	do { wake_wal_senders = true; } while (0)
+
+/*
+ * wakeup walsenders if there is work to be done
+ */
+#define WalSndWakeupProcessRequests()		\
+	do										\
+	{										\
+		if (wake_wal_senders)				\
+		{									\
+			wake_wal_senders = false;		\
+			if (max_wal_senders > 0)		\
+				WalSndWakeup();				\
+		}									\
+	} while (0)
+
+#endif							/* _WALSENDER_H */