dist/ipf/lib/mutex_emul.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2003 by Darren Reed.
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  * Id: mutex_emul.c,v 1.2.4.1 2006/06/16 17:21:06 darrenr Exp
   9  */
  10
  11 #include "ipf.h"
  12
  13 #define EMM_MAGIC       0x9d7adba3
  14
  15 void eMmutex_enter(mtx, file, line)
  16 eMmutex_t *mtx;
  17 char *file;
  18 int line;
  19 {
  20         if (mtx->eMm_magic != EMM_MAGIC) {
  21                 fprintf(stderr, "%s:eMmutex_enter(%p): bad magic: %#x\n",
  22                         mtx->eMm_owner, mtx, mtx->eMm_magic);
  23                 abort();
  24         }
  25         if (mtx->eMm_held != 0) {
  26                 fprintf(stderr, "%s:eMmutex_enter(%p): already locked: %d\n",
  27                         mtx->eMm_owner, mtx, mtx->eMm_held);
  28                 abort();
  29         }
  30         mtx->eMm_held++;
  31         mtx->eMm_heldin = file;
  32         mtx->eMm_heldat = line;
  33 }
  34
  35
  36 void eMmutex_exit(mtx)
  37 eMmutex_t *mtx;
  38 {
  39         if (mtx->eMm_magic != EMM_MAGIC) {
  40                 fprintf(stderr, "%s:eMmutex_exit(%p): bad magic: %#x\n",
  41                         mtx->eMm_owner, mtx, mtx->eMm_magic);
  42                 abort();
  43         }
  44         if (mtx->eMm_held != 1) {
  45                 fprintf(stderr, "%s:eMmutex_exit(%p): not locked: %d\n",
  46                         mtx->eMm_owner, mtx, mtx->eMm_held);
  47                 abort();
  48         }
  49         mtx->eMm_held--;
  50         mtx->eMm_heldin = NULL;
  51         mtx->eMm_heldat = 0;
  52 }
  53
  54
  55 void eMmutex_init(mtx, who)
  56 eMmutex_t *mtx;
  57 char *who;
  58 {
  59         if (mtx->eMm_magic == EMM_MAGIC) {      /* safe bet ? */
  60                 fprintf(stderr,
  61                         "%s:eMmutex_init(%p): already initialised?: %#x\n",
  62                         mtx->eMm_owner, mtx, mtx->eMm_magic);
  63                 abort();
  64         }
  65         mtx->eMm_magic = EMM_MAGIC;
  66         mtx->eMm_held = 0;
  67         if (who != NULL)
  68                 mtx->eMm_owner = strdup(who);
  69         else
  70                 mtx->eMm_owner = NULL;
  71 }
  72
  73
  74 void eMmutex_destroy(mtx)
  75 eMmutex_t *mtx;
  76 {
  77         if (mtx->eMm_magic != EMM_MAGIC) {
  78                 fprintf(stderr, "%s:eMmutex_destroy(%p): bad magic: %#x\n",
  79                         mtx->eMm_owner, mtx, mtx->eMm_magic);
  80                 abort();
  81         }
  82         if (mtx->eMm_held != 0) {
  83                 fprintf(stderr, "%s:eMmutex_enter(%p): still locked: %d\n",
  84                         mtx->eMm_owner, mtx, mtx->eMm_held);
  85                 abort();
  86         }
  87         memset(mtx, 0xa5, sizeof(*mtx));
  88 }