Postgres95 1.01 Distribution - Virgin Sources

src/backend/utils/mcxt.h

@@ -0,0 +1,56 @@
+/*-------------------------------------------------------------------------
+ *
+ * mcxt.h--
+ *    POSTGRES memory context definitions.
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: mcxt.h,v 1.1.1.1 1996/07/09 06:22:02 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef	MCXT_H
+#define MCXT_H
+
+#include "c.h"
+
+#include "nodes/memnodes.h"
+#include "nodes/nodes.h"
+
+extern MemoryContext	CurrentMemoryContext;
+extern MemoryContext	TopMemoryContext;
+
+
+/*
+ * MaxAllocSize --
+ *	Arbitrary limit on size of allocations.
+ *
+ * Note:
+ *	There is no guarantee that allocations smaller than MaxAllocSize
+ *	will succeed.  Allocation requests larger than MaxAllocSize will
+ *	be summarily denied.
+ *
+ *	This value should not be referenced except in one place in the code.
+ *
+ * XXX This should be defined in a file of tunable constants.
+ */
+#define MaxAllocSize	(0xfffffff)	/* 16G - 1 */
+
+/*
+ * prototypes for functions in mcxt.c
+ */
+extern void EnableMemoryContext(bool on);
+extern Pointer MemoryContextAlloc(MemoryContext context, Size size);
+extern Pointer MemoryContextRealloc(MemoryContext context,
+				    Pointer pointer,
+				    Size size);
+extern void MemoryContextFree(MemoryContext context, Pointer pointer);
+extern char *MemoryContextGetName(MemoryContext context);
+extern Size PointerGetAllocSize(Pointer pointer);
+extern MemoryContext MemoryContextSwitchTo(MemoryContext context);
+extern GlobalMemory CreateGlobalMemory(char *name);
+extern void GlobalMemoryDestroy(GlobalMemory context);
+
+
+#endif	/* MCXT_H */