db2/lock/lock_conflict.c

   1 /*-
   2  * See the file LICENSE for redistribution information.
   3  *
   4  * Copyright (c) 1996, 1997, 1998
   5  *      Sleepycat Software.  All rights reserved.
   6  */
   7
   8 #include "config.h"
   9
  10 #ifndef lint
  11 static const char sccsid[] = "@(#)lock_conflict.c       10.3 (Sleepycat) 4/10/98";
  12 #endif /* not lint */
  13
  14 #ifndef NO_SYSTEM_INCLUDES
  15 #include <sys/types.h>
  16 #endif
  17
  18 #include "db_int.h"
  19
  20 /*
  21  * The conflict arrays are set up such that the row is the lock you
  22  * are holding and the column is the lock that is desired.
  23  */
  24 const u_int8_t db_rw_conflicts[] = {
  25         /*              N   R   W */
  26         /*   N */       0,  0,  0,
  27         /*   R */       0,  0,  1,
  28         /*   W */       0,  1,  1
  29 };
  30
  31 const u_int8_t db_riw_conflicts[] = {
  32         /*              N       S       X       IS      IX      SIX */
  33         /*   N */       0,      0,      0,      0,      0,      0,
  34         /*   S */       0,      0,      1,      0,      1,      1,
  35         /*   X */       1,      1,      1,      1,      1,      1,
  36         /*  IS */       0,      0,      1,      0,      0,      0,
  37         /*  IX */       0,      1,      1,      0,      0,      0,
  38         /* SIX */       0,      1,      1,      0,      0,      0
  39 };