src/cache.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 CACHE_H
  20 #define CACHE_H
  21
  22 #include <pthread.h>
  23
  24 #ifdef DEBUG
  25 #define CACHE_LOCK_DEBUG        log_write(N_("%s(%i): LOCK tid=%p"), __FUNCTION__, __LINE__, pthread_self());
  26 #define CACHE_UNLOCK_DEBUG      log_write(N_("%s(%i): UNLOCK tid=%p"), __FUNCTION__, __LINE__, pthread_self());
  27 #else
  28 #define CACHE_LOCK_DEBUG
  29 #define CACHE_UNLOCK_DEBUG
  30 #endif
  31
  32 #define CACHE_TRYLOCK(ctx)      if (pthread_mutex_trylock(&cache_mutex) == EBUSY) {\
  33                                     log_write(N_("%s(%i): cache mutex LOCKED"), __FUNCTION__, __LINE__); \
  34                                     if (ctx) \
  35                                         send_status(ctx, STATUS_LOCKED, NULL); \
  36                                     pthread_mutex_lock(&cache_mutex); \
  37                                 }
  38
  39 #define CACHE_LOCK(ctx)         CACHE_LOCK_DEBUG CACHE_TRYLOCK(ctx)
  40 #define CACHE_UNLOCK            CACHE_UNLOCK_DEBUG pthread_mutex_unlock(&cache_mutex)
  41
  42 typedef struct {
  43     guchar filename[16];        /* MD5 hash. */
  44     guchar key[32];             /* SHA256/AES256/gcrykeysize */
  45     glong timeout;              /* adjust_cache_time_thread(). */
  46     glong reset;                /* To reset .timeout. */
  47     pthread_mutex_t *mutex;     /* Not related to cache_mutex. */
  48     gint refcount;              /* The number of associated clients. */
  49 } file_cache_t;
  50
  51 GSList *key_cache;
  52 pthread_mutex_t cache_mutex;
  53
  54 void cache_adjust_timer(void);
  55 gboolean cache_set_timeout(const guchar *md5filename, glong timeout);
  56 gboolean cache_reset_timeout(const guchar *md5filename, glong timeout);
  57 gboolean cache_iscached(const guchar *md5filename);
  58 gboolean cache_clear(const guchar *md5filename, gint which);
  59 gboolean cache_add_file(const guchar *md5file, const guchar *shakey);
  60 gboolean cache_get_key(const guchar *md5file, guchar *shakey);
  61 gboolean cache_update_key(const guchar *md5filename, const guchar *shakey);
  62 gint cache_file_count(void);
  63 gboolean cache_has_file(const guchar *md5file);
  64 void send_status_all(status_msg_t which);
  65 gboolean cache_get_mutex(const guchar *md5filename, pthread_mutex_t **result);
  66 gboolean cache_decr_refcount(const guchar *md5filename);
  67 gboolean cache_incr_refcount(const guchar *md5filename);
  68 void cache_free();
  69
  70 #endif