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 enum smb_thread_lock_type {
  24         SMB_THREAD_LOCK = 1,
  25         SMB_THREAD_UNLOCK
  26 };
  27
  28 struct smb_thread_functions {
  29         /* Mutex and tls functions. */
  30         int (*create_mutex)(const char *lockname,
  31                         void **pplock,
  32                         const char *location);
  33         void (*destroy_mutex)(void *plock,
  34                         const char *location);
  35         int (*lock_mutex)(void *plock, enum smb_thread_lock_type lock_type,
  36                         const char *location);
  37
  38         /* Thread local storage. */
  39         int (*create_tls_once)(const char *keyname,
  40                         void **ppkey,
  41                         const char *location);
  42         void (*destroy_tls_once)(void **pkey,
  43                         const char *location);
  44         int (*set_tls)(void *pkey, const void *pval, const char *location);
  45         void *(*get_tls)(void *pkey, const char *location);
  46 };
  47
  48 extern const struct smb_thread_functions *global_tfp;
  49
  50 /* Define the pthread version of the functions. */
  51
  52 #define SMB_THREADS_DEF_PTHREAD_IMPLEMENTATION(tf) \
  53  \
  54 static int smb_create_mutex_pthread(const char *lockname, void **pplock, const char *location) \
  55 { \
  56         pthread_mutex_t *pmut = (pthread_mutex_t *)malloc(sizeof(pthread_mutex_t)); \
  57         if (!pmut) { \
  58                 return ENOMEM; \
  59         } \
  60         pthread_mutex_init(pmut, NULL); \
  61         *pplock = (void *)pmut; \
  62         return 0; \
  63 } \
  64  \
  65 static void smb_destroy_mutex_pthread(void *plock, const char *location) \
  66 { \
  67         pthread_mutex_destroy((pthread_mutex_t *)plock); \
  68         free(plock); \
  69 } \
  70  \
  71 static int smb_lock_pthread(void *plock, enum smb_thread_lock_type lock_type, const char *location) \
  72 { \
  73         if (lock_type == SMB_THREAD_UNLOCK) { \
  74                 return pthread_mutex_unlock((pthread_mutex_t *)plock); \
  75         } else { \
  76                 return pthread_mutex_lock((pthread_mutex_t *)plock); \
  77         } \
  78 } \
  79  \
  80 static pthread_mutex_t create_tls_mutex = PTHREAD_MUTEX_INITIALIZER; \
  81  \
  82 static int smb_create_tls_once_pthread(const char *keyname, void **ppkey, const char *location) \
  83 { \
  84         int ret; \
  85         pthread_key_t *pkey; \
  86         ret = pthread_mutex_lock(&create_tls_mutex); \
  87         if (ret) { \
  88                 return ret; \
  89         } \
  90         if (*ppkey) { \
  91                 pthread_mutex_unlock(&create_tls_mutex); \
  92                 return 0; \
  93         } \
  94         pkey = (pthread_key_t *)malloc(sizeof(pthread_key_t)); \
  95         if (!pkey) { \
  96                 pthread_mutex_unlock(&create_tls_mutex); \
  97                 return ENOMEM; \
  98         } \
  99         ret = pthread_key_create(pkey, NULL); \
 100         if (ret) { \
 101                 free(pkey); \
 102                 pthread_mutex_unlock(&create_tls_mutex); \
 103                 return ret; \
 104         } \
 105         *ppkey = (void *)pkey; \
 106         pthread_mutex_unlock(&create_tls_mutex); \
 107         return 0; \
 108 } \
 109  \
 110 static void smb_destroy_tls_once_pthread(void **ppkey, const char *location) \
 111 { \
 112         pthread_mutex_lock(&create_tls_mutex); \
 113         if (*ppkey) { \
 114                 pthread_key_delete(*(pthread_key_t *)ppkey); \
 115                 free(*ppkey); \
 116                 *ppkey = NULL; \
 117         } \
 118         pthread_mutex_unlock(&create_tls_mutex); \
 119 } \
 120  \
 121 static int smb_set_tls_pthread(void *pkey, const void *pval, const char *location) \
 122 { \
 123         return pthread_setspecific(*(pthread_key_t *)pkey, pval); \
 124 } \
 125  \
 126 static void *smb_get_tls_pthread(void *pkey, const char *location) \
 127 { \
 128         return pthread_getspecific(*(pthread_key_t *)pkey); \
 129 } \
 130  \
 131 static const struct smb_thread_functions (tf) = { \
 132                         smb_create_mutex_pthread, \
 133                         smb_destroy_mutex_pthread, \
 134                         smb_lock_pthread, \
 135                         smb_create_tls_once_pthread, \
 136                         smb_destroy_tls_once_pthread, \
 137                         smb_set_tls_pthread, \
 138                         smb_get_tls_pthread }
 139
 140 #endif