usermode/library/mtm/src/mode/pwb-common/locks.h

00001 /*
00002     Copyright (C) 2011 Computer Sciences Department, 
00003     University of Wisconsin -- Madison
00004 
00005     ----------------------------------------------------------------------
00006 
00007     This file is part of Mnemosyne: Lightweight Persistent Memory, 
00008     originally developed at the University of Wisconsin -- Madison.
00009 
00010     Mnemosyne was originally developed primarily by Haris Volos
00011     with contributions from Andres Jaan Tack.
00012 
00013     ----------------------------------------------------------------------
00014 
00015     Mnemosyne is free software; you can redistribute it and/or
00016     modify it under the terms of the GNU General Public License
00017     as published by the Free Software Foundation, version 2
00018     of the License.
00019  
00020     Mnemosyne is distributed in the hope that it will be useful,
00021     but WITHOUT ANY WARRANTY; without even the implied warranty of
00022     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00023     GNU General Public License for more details.
00024 
00025     You should have received a copy of the GNU General Public License
00026     along with this program; if not, write to the Free Software
00027     Foundation, Inc., 51 Franklin Street, Fifth Floor, 
00028     Boston, MA  02110-1301, USA.
00029 
00030 ### END HEADER ###
00031 */
00032 
00033 #ifndef _PWB_LOCKS_H
00034 #define _PWB_LOCKS_H
00035 
00036 #undef VERSION_MAX
00037 #undef LOCK_GET_TIMESTAMP
00038 #undef LOCK_SET_TIMESTAMP
00039 
00040 #define VERSION_MAX                     (~(mtm_word_t)0 >> 1)
00041 
00042 #define LOCK_GET_TIMESTAMP(l)           (l >> 1)         /* Logical shift (unsigned) */
00043 #define LOCK_SET_TIMESTAMP(t)           (t << 1)         /* OWNED bit not set */
00044 
00045 #endif /* _PWB_LOCKS_H */

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