src/cache.h

   1 /* vim:tw=78:ts=8:sw=4:set ft=c:  */
   2 /*
   3     Copyright (C) 2006-2007 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  02111-1307  USA
  18 */
  19 #ifndef CACHE_H
  20 #define CACHE_H
  21
  22 #include <pth.h>
  23
  24 #ifdef DEBUG
  25 #define CACHE_LOCK_DEBUG        log_write(N_("LOCK %s tid=%p"), __FUNCTION__, pth_self());
  26 #define CACHE_UNLOCK_DEBUG      log_write(N_("UNLOCK %s tid=%p"), __FUNCTION__, pth_self());
  27 #else
  28 #define CACHE_LOCK_DEBUG
  29 #define CACHE_UNLOCK_DEBUG
  30 #endif
  31
  32 #define CACHE_TRYLOCK(ctx, ev)  if (pth_mutex_acquire(&cache_mutex, TRUE, ev) == FALSE) {\
  33                                     if (errno == EBUSY) { \
  34                                         log_write(N_("%s(): cache mutex LOCKED"), __FUNCTION__); \
  35                                         if (ctx) \
  36                                             assuan_write_status(ctx, "LOCKED", N_("Waiting for lock")); \
  37                                         pth_mutex_acquire(&cache_mutex, FALSE, ev); \
  38                                     } \
  39                                     else \
  40                                         log_write("%s(%i): %s", __FUNCTION__, __LINE__, strerror(errno)); \
  41                                 }
  42
  43 #define CACHE_LOCK(ctx, ev)     CACHE_LOCK_DEBUG CACHE_TRYLOCK(ctx, ev)
  44 #define CACHE_UNLOCK            CACHE_UNLOCK_DEBUG pth_mutex_release(&cache_mutex)
  45
  46 typedef struct {
  47     guchar filename[16];        // MD5
  48     guchar key[32];             // SHA256/AES256/gcrykeysize
  49     gboolean used;
  50     glong timeout;
  51     glong reset;
  52 } file_cache_t;
  53
  54 void *key_cache;
  55 glong cache_size;
  56 pth_mutex_t cache_mutex;
  57
  58 void cache_adjust_timer(void);
  59 gboolean cache_set_timeout(const guchar *md5filename, glong timeout);
  60 gboolean cache_reset_timeout(const guchar *md5filename, glong timeout);
  61 gboolean cache_iscached(const guchar *md5filename);
  62 gboolean cache_clear(const guchar *md5filename, gint which);
  63 gboolean cache_add_file(const guchar *md5file, const guchar *shakey);
  64 gboolean cache_get_key(const guchar *md5file, guchar *shakey);
  65 gboolean cache_update_key(const guchar *md5filename, const guchar *shakey);
  66 gint cache_file_count(void);
  67 gboolean cache_has_file(const guchar *md5file);
  68 void send_cache_status_all(void);
  69
  70 #endif