lib/util/smb_threads.h

   1 /*
   2         Unix SMB/CIFS implementation.
   3         SMB thread interface functions.
   4         Copyright (C) Jeremy Allison, 2009.
   5
   6         This program is free software; you can redistribute it and/or modify
   7         it under the terms of the GNU General Public License as published by
   8         the Free Software Foundation; either version 3 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14         GNU General Public License for more details.
  15
  16         You should have received a copy of the GNU General Public License
  17         along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef _smb_threads_h_
  21 #define _smb_threads_h_
  22
  23 typedef bool smb_thread_once_t;
  24 #define SMB_THREAD_ONCE_INIT false
  25 #define SMB_THREAD_ONCE_IS_INITIALIZED(val) ((val) == true)
  26 #define SMB_THREAD_ONCE_INITIALIZE(val) ((val) = true)
  27
  28 enum smb_thread_lock_type {
  29         SMB_THREAD_LOCK = 1,
  30         SMB_THREAD_UNLOCK
  31 };
  32
  33 struct smb_thread_functions {
  34         /* Mutex and tls functions. */
  35         int (*create_mutex)(const char *lockname,
  36                         void **pplock,
  37                         const char *location);
  38         void (*destroy_mutex)(void *plock,
  39                         const char *location);
  40         int (*lock_mutex)(void *plock,
  41                           int lock_type,
  42                           const char *location);
  43
  44         /* Thread local storage. */
  45         int (*create_tls)(const char *keyname,
  46                         void **ppkey,
  47                         const char *location);
  48         void (*destroy_tls)(void **pkey,
  49                         const char *location);
  50         int (*set_tls)(void *pkey, const void *pval, const char *location);
  51         void *(*get_tls)(void *pkey, const char *location);
  52 };
  53
  54 int smb_thread_set_functions(const struct smb_thread_functions *tf);
  55 void smb_thread_once(smb_thread_once_t *ponce, void (*init_fn)(void));
  56
  57 extern const struct smb_thread_functions *global_tfp;
  58
  59 /* Define the pthread version of the functions. */
  60
  61 #define SMB_THREADS_DEF_PTHREAD_IMPLEMENTATION(tf) \
  62  \
  63 static int smb_create_mutex_pthread(const char *lockname, void **pplock, const char *location) \
  64 { \
  65         pthread_mutex_t *pmut = (pthread_mutex_t *)malloc(sizeof(pthread_mutex_t)); \
  66         if (!pmut) { \
  67                 return ENOMEM; \
  68         } \
  69         pthread_mutex_init(pmut, NULL); \
  70         *pplock = (void *)pmut; \
  71         return 0; \
  72 } \
  73  \
  74 static void smb_destroy_mutex_pthread(void *plock, const char *location) \
  75 { \
  76         pthread_mutex_destroy((pthread_mutex_t *)plock); \
  77         free(plock); \
  78 } \
  79  \
  80 static int smb_lock_pthread(void *plock, int lock_type, const char *location) \
  81 { \
  82         if (lock_type == SMB_THREAD_UNLOCK) { \
  83                 return pthread_mutex_unlock((pthread_mutex_t *)plock); \
  84         } else { \
  85                 return pthread_mutex_lock((pthread_mutex_t *)plock); \
  86         } \
  87 } \
  88  \
  89 static int smb_create_tls_pthread(const char *keyname, void **ppkey, const char *location) \
  90 { \
  91         int ret; \
  92         pthread_key_t *pkey; \
  93         pkey = (pthread_key_t *)malloc(sizeof(pthread_key_t)); \
  94         if (!pkey) { \
  95                 return ENOMEM; \
  96         } \
  97         ret = pthread_key_create(pkey, NULL); \
  98         if (ret) { \
  99                 free(pkey); \
 100                 return ret; \
 101         } \
 102         *ppkey = (void *)pkey; \
 103         return 0; \
 104 } \
 105  \
 106 static void smb_destroy_tls_pthread(void **ppkey, const char *location) \
 107 { \
 108         if (*ppkey) { \
 109                 pthread_key_delete(*(pthread_key_t *)ppkey); \
 110                 free(*ppkey); \
 111                 *ppkey = NULL; \
 112         } \
 113 } \
 114  \
 115 static int smb_set_tls_pthread(void *pkey, const void *pval, const char *location) \
 116 { \
 117         return pthread_setspecific(*(pthread_key_t *)pkey, pval); \
 118 } \
 119  \
 120 static void *smb_get_tls_pthread(void *pkey, const char *location) \
 121 { \
 122         return pthread_getspecific(*(pthread_key_t *)pkey); \
 123 } \
 124  \
 125 static const struct smb_thread_functions (tf) = { \
 126                         smb_create_mutex_pthread, \
 127                         smb_destroy_mutex_pthread, \
 128                         smb_lock_pthread, \
 129                         smb_create_tls_pthread, \
 130                         smb_destroy_tls_pthread, \
 131                         smb_set_tls_pthread, \
 132                         smb_get_tls_pthread }
 133
 134 #endif