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authorQuincey Koziol <koziol@hdfgroup.org>1997-07-30 21:17:56 (GMT)
committerQuincey Koziol <koziol@hdfgroup.org>1997-07-30 21:17:56 (GMT)
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+/*-------------------------------------------------------------------------
+ * Copyright (C) 1997 National Center for Supercomputing Applications.
+ * All rights reserved.
+ *
+ *-------------------------------------------------------------------------
+ *
+ * Created: H5ACprivate.h
+ * Jul 9 1997
+ * Robb Matzke <robb@maya.nuance.com>
+ *
+ * Purpose: Constants and typedefs available to the rest of the
+ * library.
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef _H5ACprivate_H
+#define _H5ACprivate_H
+
+#include "H5ACproto.h" /*public prototypes */
+#include "H5Fprivate.h" /*for private hdf5_file_t definition */
+
+/*
+ * Class methods pertaining to caching. Each type of cached object will
+ * have a constant variable with permanent life-span that describes how
+ * to cache the object. That variable will be of type H5AC_class_t and
+ * have the following required fields...
+ *
+ * LOAD: Loads an object from disk to memory. The function
+ * should allocate some data structure and return it.
+ *
+ * FLUSH: Writes some data structure back to disk. It would be
+ * wise for the data structure to include dirty flags to
+ * indicate whether it really needs to be written. This
+ * function is also responsible for freeing memory allocated
+ * by the LOAD method if the DEST argument is non-zero.
+ */
+typedef struct H5AC_class_t {
+ void *(*load)(hdf5_file_t*, off_t addr, const void *udata);
+ herr_t (*flush)(hdf5_file_t*, hbool_t dest, off_t addr, void *thing);
+} H5AC_class_t;
+
+/*
+ * A cache has a certain number of entries. Objects are mapped into a
+ * cache entry by hashing the object's file address. Each file has its
+ * own cache, an array of slots.
+ */
+#define H5AC_NSLOTS 1033 /*prime number tend to work best */
+
+typedef struct H5AC_cache_t {
+ const H5AC_class_t *type; /*type of object stored here */
+ off_t addr; /*file address for object */
+ void *thing; /*the thing which is cached */
+} H5AC_cache_t;
+
+/*
+ * Library prototypes.
+ */
+herr_t H5AC_dest (hdf5_file_t *f);
+void *H5AC_find (hdf5_file_t *f, const H5AC_class_t *type, off_t addr,
+ const void *udata);
+herr_t H5AC_flush (hdf5_file_t *f, const H5AC_class_t *type, off_t addr,
+ hbool_t destroy);
+herr_t H5AC_new (hdf5_file_t *f);
+herr_t H5AC_rename (hdf5_file_t *f, const H5AC_class_t *type,
+ off_t old, off_t new);
+herr_t H5AC_set (hdf5_file_t *f, const H5AC_class_t *type, off_t addr,
+ void *thing);
+
+#endif /* !_H5ACprivate_H */