1 files changed, 62 insertions, 0 deletions
diff --git a/src/include/access/rmgr.h b/src/include/access/rmgr.h
new file mode 100644
index 0000000..3b6a497
--- /dev/null
+++ b/src/include/access/rmgr.h
@@ -0,0 +1,62 @@
+/*
+ * rmgr.h
+ *
+ * Resource managers definition
+ *
+ * src/include/access/rmgr.h
+ */
+#ifndef RMGR_H
+#define RMGR_H
+
+typedef uint8 RmgrId;
+
+/*
+ * Built-in resource managers
+ *
+ * The actual numerical values for each rmgr ID are defined by the order
+ * of entries in rmgrlist.h.
+ *
+ * Note: RM_MAX_ID must fit in RmgrId; widening that type will affect the XLOG
+ * file format.
+ */
+#define PG_RMGR(symname,name,redo,desc,identify,startup,cleanup,mask,decode) \
+	symname,
+
+typedef enum RmgrIds
+{
+#include "access/rmgrlist.h"
+	RM_NEXT_ID
+}			RmgrIds;
+
+#undef PG_RMGR
+
+#define RM_MAX_ID			UINT8_MAX
+#define RM_MAX_BUILTIN_ID	(RM_NEXT_ID - 1)
+#define RM_MIN_CUSTOM_ID	128
+#define RM_MAX_CUSTOM_ID	UINT8_MAX
+#define RM_N_IDS			(UINT8_MAX + 1)
+#define RM_N_BUILTIN_IDS	(RM_MAX_BUILTIN_ID + 1)
+#define RM_N_CUSTOM_IDS		(RM_MAX_CUSTOM_ID - RM_MIN_CUSTOM_ID + 1)
+
+static inline bool
+RmgrIdIsBuiltin(int rmid)
+{
+	return rmid <= RM_MAX_BUILTIN_ID;
+}
+
+static inline bool
+RmgrIdIsCustom(int rmid)
+{
+	return rmid >= RM_MIN_CUSTOM_ID && rmid <= RM_MAX_CUSTOM_ID;
+}
+
+#define RmgrIdIsValid(rmid) (RmgrIdIsBuiltin((rmid)) || RmgrIdIsCustom((rmid)))
+
+/*
+ * RmgrId to use for extensions that require an RmgrId, but are still in
+ * development and have not reserved their own unique RmgrId yet. See:
+ * https://wiki.postgresql.org/wiki/CustomWALResourceManagers
+ */
+#define RM_EXPERIMENTAL_ID		128
+
+#endif							/* RMGR_H */