[svn-r12739] Added Direct I/O driver to VFD. It's only supported by SGI Altix (cobalt). There's a configure

option --enable-direct-vfd/--disable-direct-vfd to enable/disable Direct I/O support.  The default
is enabled.  There's a small test in test/vfd.c.  Another way to test it is to set environment
variable HDF5_DRIVER to "direct" and run "make check" in the test/ directory.  There'll be some
further improvement in the following checkin including allowing user to provide memory boundary
value, file block size, and copying buffer size.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/H5FDdirect.h b/src/H5FDdirect.h
new file mode 100644
index 0000000..25ff3de
--- /dev/null
+++ b/src/H5FDdirect.h
@@ -0,0 +1,47 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
+ * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Programmer:  Raymond Lu <slu@hdfgroup.uiuc.edu>
+ *              Wednesday, 20 September 2006
+ *
+ * Purpose:	The public header file for the direct driver.
+ */
+#ifndef H5FDdirect_H
+#define H5FDdirect_H
+
+#include "H5Ipublic.h"
+
+#ifdef H5_HAVE_DIRECT
+#       define H5FD_DIRECT	(H5FD_direct_init())
+#else
+#       define H5FD_DIRECT      (-1)
+#endif /* H5_HAVE_DIRECT */
+
+#ifdef H5_HAVE_DIRECT
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+H5_DLL hid_t H5FD_direct_init(void);
+H5_DLL void H5FD_direct_term(void);
+H5_DLL herr_t H5Pset_fapl_direct(hid_t fapl_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* H5_HAVE_DIRECT */
+
+#endif