common/mpls_refcnt.h

   1
   2 /*
   3  *  Copyright (C) James R. Leu 2002
   4  *  jleu@mindspring.com
   5  *
   6  *  This software is covered under the LGPL, for more
   7  *  info check out http://www.gnu.org/copyleft/lgpl.html
   8  */
   9
  10 #ifndef _MPLS_REFCNT_H_
  11 #define _MPLS_REFCNT_H_
  12
  13 #include "mpls_assert.h"
  14
  15 #define MPLS_REFCNT_FIELD  uint32_t     _refcnt
  16
  17 #define MPLS_REFCNT_VALUE(obj) (obj)?((obj)->_refcnt):(-1)
  18
  19 #define MPLS_REFCNT_INIT(obj,count) {           \
  20   (obj)->_refcnt = count;                       \
  21 }
  22
  23 #define MPLS_REFCNT_HOLD(obj) {                 \
  24   if((obj) != NULL) {                           \
  25     (obj)->_refcnt++;                           \
  26   }                                             \
  27 }
  28
  29 #define MPLS_REFCNT_RELEASE(obj,dstry) {                \
  30   if((obj) != NULL) {                           \
  31     (obj)->_refcnt--;                           \
  32     if((obj)->_refcnt <= 0) {                   \
  33       dstry(obj);                               \
  34       obj = NULL;                               \
  35     }                                           \
  36   }                                             \
  37 }
  38
  39 #define MPLS_REFCNT_ASSERT(obj,count) {         \
  40   if((obj) != NULL) {                           \
  41     MPLS_ASSERT((obj)->_refcnt == count);       \
  42   }                                             \
  43 }
  44
  45 #define MPLS_REFCNT_PTR_TYPE  uint32_t*
  46 #define MPLS_REFCNT_PTR(obj) (((obj) != NULL)?(&((obj)->_refcnt)):(NULL))
  47
  48 #define MPLS_REFCNT_PTR_HOLD(ptr) {             \
  49   if((ptr) != NULL) {                           \
  50     ((*(ptr))++);                               \
  51   }                                             \
  52 }
  53 #define MPLS_REFCNT_PTR_RELEASE(ptr) {          \
  54   if((ptr) != NULL) {                           \
  55     ((*(ptr))--);                               \
  56   }                                             \
  57 }
  58
  59 #endif