src/lock.h

   1 /* vim:tw=78:ts=8:sw=4:set ft=c:  */
   2 /*
   3     Copyright (C) 2006-2009 Ben Kibbey <bjk@luxsci.net>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02110-1301  USA
  18 */
  19 #ifndef LOCK_H
  20 #define LOCK_H
  21
  22 #include <pth.h>
  23 #include <assert.h>
  24 #include <errno.h>
  25 #include "cache.h"
  26
  27 #ifdef DEBUG
  28 #define MUTEX_LOCK_DEBUG(m) \
  29     log_write("%s(%i): %s(): LOCK %p", __FILE__, __LINE__, __FUNCTION__, m);
  30 #define MUTEX_UNLOCK_DEBUG(m) \
  31     log_write("%s(%i): %s(): UNLOCK %p", __FILE__, __LINE__, __FUNCTION__, m);
  32 #else
  33 #define MUTEX_LOCK_DEBUG(m)
  34 #define MUTEX_UNLOCK_DEBUG(m)
  35 #endif
  36
  37 #define CACHE_LOCK(ctx) MUTEX_LOCK(&cache_mutex)
  38 #define CACHE_UNLOCK MUTEX_UNLOCK(&cache_mutex)
  39
  40 #define MUTEX_LOCK(m) \
  41     MUTEX_LOCK_DEBUG(m) \
  42     if (!pth_mutex_acquire(m, FALSE, NULL)) { \
  43         log_write("%s(%i): %s: LOCK", __FILE__, __LINE__, strerror(errno)); \
  44         assert(0); \
  45     } \
  46
  47 #define MUTEX_UNLOCK(m) \
  48     MUTEX_UNLOCK_DEBUG(m) \
  49     if (!pth_mutex_release(m) && errno != EDEADLK) { \
  50         log_write("%s(%i): %s: UNLOCK", __FILE__, __LINE__, strerror(errno)); \
  51         assert(0); \
  52     }
  53
  54 #define MUTEX_TRYLOCK(ctx, m, rc) \
  55     if (!pth_mutex_acquire(m, TRUE, NULL)) { \
  56         if (errno == EBUSY) { \
  57             if (ctx) {\
  58                 rc = send_status(ctx, STATUS_LOCKED, NULL); \
  59                 if (!rc) { \
  60                     MUTEX_LOCK(m); \
  61                 } \
  62             } \
  63         } \
  64         else { \
  65             log_write("%s(%i): %s: LOCK", __FILE__, __LINE__, __FUNCTION__); \
  66             assert(0); \
  67         } \
  68     } \
  69     else { \
  70         MUTEX_LOCK_DEBUG(m) \
  71     }
  72
  73 #endif