4.3BSD - /usr/ingres/source/h/lock.h

   1: /*
   2: **  LOCK.H -- Concurency structs and global variables
   3: **
   4: **	Version:
   5: **		@(#)lock.h	8.1	12/31/84
   6: */
   7: 
   8: # ifndef KEYSIZE
   9: 
  10: 
  11: # define    M_SHARE     2
  12: # define    M_EXCL      1
  13: # define    T_CS        0
  14: # define    T_PAGE      1
  15: # define    T_REL       2
  16: # define    T_DB        3
  17: # define    A_RTN       1
  18: # define    A_SLP       2
  19: # define    A_RLS1      3
  20: # define    A_RLSA      4
  21: # define    KEYSIZE     12
  22: struct lockreq
  23: {
  24:     char    lract;          /* requested action
  25: 					 *	=1 request lock,err return
  26: 					 *	=2 request lock,sleep
  27: 					 *	=3 release lock
  28: 					 *	=release all locks for pid
  29: 					 */
  30:     char    lrtype;         /* type of lock:
  31: 					 *   =0, critical section lock
  32: 					 *   =1, page lock
  33: 					 *   =2, logical lock
  34: 					 *   =3, data base lock
  35: 					 */
  36:     char    lrmod;          /* mode of lock
  37: 					 *	=1 exclusive lock
  38: 					 *	=2 shared lock
  39: 					*/
  40:                     /* key for the lock */
  41:     char    dbnode[4];      /* inode of data base */
  42:     char    lrel[4];        /* relation tid */
  43:     char    lpage[4];       /* page address		*/
  44: };
  45: 
  46: extern char Acclock;        /* locks enabled flag */
  47: extern int  Alockdes;       /* file descriptor for lock device*/
  48: extern int  Lockrel;        /* lock relations flag*/
  49: 
  50: 
  51: # endif KEYSIZE

Defined struct's

Defined macros