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db_include/storage/lockdefs.h

@@ -0,0 +1,59 @@
+/*-------------------------------------------------------------------------
+ *
+ * lockdefs.h
+ *	   Frontend exposed parts of postgres' low level lock mechanism
+ *
+ * The split between lockdefs.h and lock.h is not very principled. This file
+ * contains definition that have to (indirectly) be available when included by
+ * FRONTEND code.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/storage/lockdefs.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef LOCKDEFS_H_
+#define LOCKDEFS_H_
+
+/*
+ * LOCKMODE is an integer (1..N) indicating a lock type.  LOCKMASK is a bit
+ * mask indicating a set of held or requested lock types (the bit 1<<mode
+ * corresponds to a particular lock mode).
+ */
+typedef int LOCKMASK;
+typedef int LOCKMODE;
+
+/*
+ * These are the valid values of type LOCKMODE for all the standard lock
+ * methods (both DEFAULT and USER).
+ */
+
+/* NoLock is not a lock mode, but a flag value meaning "don't get a lock" */
+#define NoLock					0
+
+#define AccessShareLock			1	/* SELECT */
+#define RowShareLock			2	/* SELECT FOR UPDATE/FOR SHARE */
+#define RowExclusiveLock		3	/* INSERT, UPDATE, DELETE */
+#define ShareUpdateExclusiveLock 4	/* VACUUM (non-FULL),ANALYZE, CREATE INDEX
+									 * CONCURRENTLY */
+#define ShareLock				5	/* CREATE INDEX (WITHOUT CONCURRENTLY) */
+#define ShareRowExclusiveLock	6	/* like EXCLUSIVE MODE, but allows ROW
+									 * SHARE */
+#define ExclusiveLock			7	/* blocks ROW SHARE/SELECT...FOR UPDATE */
+#define AccessExclusiveLock		8	/* ALTER TABLE, DROP TABLE, VACUUM FULL,
+									 * and unqualified LOCK TABLE */
+
+#define MaxLockMode				8
+
+
+/* WAL representation of an AccessExclusiveLock on a table */
+typedef struct xl_standby_lock
+{
+	TransactionId xid;			/* xid of holder of AccessExclusiveLock */
+	Oid			dbOid;			/* DB containing table */
+	Oid			relOid;			/* OID of table */
+} xl_standby_lock;
+
+#endif							/* LOCKDEFS_H_ */