1 files changed, 31 insertions, 0 deletions
diff --git a/src/include/utils/lockwaitpolicy.h b/src/include/utils/lockwaitpolicy.h
new file mode 100644
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+++ b/src/include/utils/lockwaitpolicy.h
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+/*-------------------------------------------------------------------------
+ * lockwaitpolicy.h
+ *	  Header file for LockWaitPolicy enum.
+ *
+ * Copyright (c) 2014, PostgreSQL Global Development Group
+ *
+ * src/include/utils/lockwaitpolicy.h
+ *-------------------------------------------------------------------------
+ */
+#ifndef LOCKWAITPOLICY_H
+#define LOCKWAITPOLICY_H
+
+/*
+ * This enum controls how to deal with rows being locked by FOR UPDATE/SHARE
+ * clauses (i.e., NOWAIT and SKIP LOCKED clauses).  The ordering here is
+ * important, because the highest numerical value takes precedence when a
+ * RTE is specified multiple ways.  See applyLockingClause.
+ */
+typedef enum
+{
+	/* Wait for the lock to become available (default behavior) */
+	LockWaitBlock,
+
+	/* Skip rows that can't be locked (SKIP LOCKED) */
+	LockWaitSkip,
+
+	/* Raise an error if a row cannot be locked (NOWAIT) */
+	LockWaitError
+} LockWaitPolicy;
+
+#endif   /* LOCKWAITPOLICY_H */