src/timestamp.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public License
   4  * as published by the Free Software Foundation; either version 2
   5  * of the License, or (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  15  *
  16  * See the COPYING file for license information.
  17  *
  18  * Guillaume Chazarain <guichaz@yahoo.fr>
  19  */
  20
  21 /********************************************
  22  * Timestamps for important data structures *
  23  ********************************************/
  24
  25 #include "gliv.h"
  26 #include "timestamp.h"
  27
  28 /* By maintaining our clock we have an instruction level precision. */
  29 static DECLARE_TIMESTAMP(global_clock);
  30 G_LOCK_DEFINE_STATIC(global_clock);
  31
  32 void touch(timestamp_t * ts)
  33 {
  34     G_LOCK(global_clock);
  35     *ts = ++global_clock;
  36     G_UNLOCK(global_clock);
  37 }
  38
  39 void reset_timestamp(timestamp_t * ts)
  40 {
  41     *ts = 0;
  42 }
  43
  44 gboolean up_to_date(timestamp_t ts, timestamp_t req)
  45 {
  46     return req && ts > req;
  47 }