lib/util/mutex.h

   1 #ifndef _MUTEX_H_
   2 #define _MUTEX_H_
   3 /*
   4    Unix SMB/CIFS implementation.
   5    Samba mutex functions
   6    Copyright (C) Andrew Tridgell 2003
   7    Copyright (C) James J Myers 2003
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /**
  24  * @file
  25  * @brief Mutex operations
  26  */
  27
  28 struct mutex_ops;
  29
  30 /* To add a new read/write lock, add it to enum rwlock_id
  31  */
  32 enum rwlock_id { RWLOCK_SMBD,           /* global smbd lock */
  33
  34                 RWLOCK_MAX /* this MUST be kept last */
  35 };
  36
  37 #define MUTEX_LOCK_BY_ID(mutex_index) smb_mutex_lock_by_id(mutex_index, #mutex_index)
  38 #define MUTEX_UNLOCK_BY_ID(mutex_index) smb_mutex_unlock_by_id(mutex_index, #mutex_index)
  39 #define MUTEX_INIT(mutex, name) smb_mutex_init(mutex, #name)
  40 #define MUTEX_DESTROY(mutex, name) smb_mutex_destroy(mutex, #name)
  41 #define MUTEX_LOCK(mutex, name) smb_mutex_lock(mutex, #name)
  42 #define MUTEX_UNLOCK(mutex, name) smb_mutex_unlock(mutex, #name)
  43
  44 #define RWLOCK_INIT(rwlock, name) smb_rwlock_init(rwlock, #name)
  45 #define RWLOCK_DESTROY(rwlock, name) smb_rwlock_destroy(rwlock, #name)
  46 #define RWLOCK_LOCK_WRITE(rwlock, name) smb_rwlock_lock_write(rwlock, #name)
  47 #define RWLOCK_LOCK_READ(rwlock, name) smb_rwlock_lock_read(rwlock, #name)
  48 #define RWLOCK_UNLOCK(rwlock, name) smb_rwlock_unlock(rwlock, #name)
  49
  50
  51
  52 /* this null typedef ensures we get the types right and avoids the
  53    pitfalls of void* */
  54 typedef struct smb_mutex {
  55         void *mutex;
  56 } smb_mutex_t;
  57 typedef struct {
  58         void *rwlock;
  59 } smb_rwlock_t;
  60
  61 /* the mutex model operations structure - contains function pointers to
  62    the model-specific implementations of each operation */
  63 struct mutex_ops {
  64         int (*mutex_init)(smb_mutex_t *mutex, const char *name);
  65         int (*mutex_lock)(smb_mutex_t *mutex, const char *name);
  66         int (*mutex_unlock)(smb_mutex_t *mutex, const char *name);
  67         int (*mutex_destroy)(smb_mutex_t *mutex, const char *name);
  68         int (*rwlock_init)(smb_rwlock_t *rwlock, const char *name);
  69         int (*rwlock_lock_write)(smb_rwlock_t *rwlock, const char *name);
  70         int (*rwlock_lock_read)(smb_rwlock_t *rwlock, const char *name);
  71         int (*rwlock_unlock)(smb_rwlock_t *rwlock, const char *name);
  72         int (*rwlock_destroy)(smb_rwlock_t *rwlock, const char *name);
  73 };
  74
  75 #endif /* endif _MUTEX_H_ */