X-Git-Url: http://git.tuebingen.mpg.de/?p=osl.git;a=blobdiff_plain;f=osl_core.h;h=1220a09eac1a9aa7cd59742828d8c7c4ca865c9d;hp=3359aa782a2e2cc8232dc12b6fa339885b5f4e11;hb=7517d207f55baf6955184ea0f24ae38b068861a6;hpb=2dba3a38dcfe721842404f01e9b2adb59c302604

diff --git a/osl_core.h b/osl_core.h
index 3359aa7..1220a09 100644
--- a/osl_core.h
+++ b/osl_core.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2007-2008 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2007-2009 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -190,9 +190,27 @@ _static_inline_ size_t index_column_description_size(const char *name)
 	return MIN_IDX_COLUMN_DESCRIPTION_SIZE + strlen(name) - 1;
 }
 
+/*
+ * The version used by this instance of the library. Written to the index of
+ * newly created tables.
+ */
 #define CURRENT_TABLE_VERSION 1
+
+/*
+ * The lowest library version that is able to use tables of version
+ * CURRENT_TABLE_VERSION. Also written to the index of new tables. If
+ * compat_version(table) > current_version(lib) the table can not be opened.
+ */
+#define COMPAT_TABLE_VERSION 0
+
+/*
+ * The lowest table version this library understands. On open, if
+ * current_version(table) < min_version(lib) the osl_open_table() call
+ * fails.
+ */
 #define MIN_TABLE_VERSION 1
-#define MAX_TABLE_VERSION 1
+
+
 /** An index header must be at least that many bytes long. */
 #define MIN_INDEX_HEADER_SIZE(num_cols) (MIN_IDX_COLUMN_DESCRIPTION_SIZE \
 	* num_cols + IDX_COLUMN_DESCRIPTIONS)