lib/util/smb_threads.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client library implementation (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 /*
  21  * This code is based in the ideas in openssl
  22  * but somewhat simpler and expended to include
  23  * thread local storage.
  24  */
  25
  26 #include "includes.h"
  27
  28 /*********************************************************
  29  Functions to vector the locking primitives used internally
  30  by libsmbclient.
  31 *********************************************************/
  32
  33 const struct smb_thread_functions *global_tfp;
  34
  35 /*********************************************************
  36  Dynamic lock array.
  37 *********************************************************/
  38
  39 void **global_lock_array;
  40
  41 /*********************************************************
  42  Function to set the locking primitives used by libsmbclient.
  43 *********************************************************/
  44
  45 int smb_thread_set_functions(const struct smb_thread_functions *tf)
  46 {
  47         int i;
  48
  49         global_tfp = tf;
  50
  51 #if defined(PARANOID_MALLOC_CHECKER)
  52 #ifdef malloc
  53 #undef malloc
  54 #endif
  55 #endif
  56
  57         /* Here we initialize any static locks we're using. */
  58         global_lock_array = (void **)malloc(sizeof(void *) *NUM_GLOBAL_LOCKS);
  59
  60 #if defined(PARANOID_MALLOC_CHECKER)
  61 #define malloc(s) __ERROR_DONT_USE_MALLOC_DIRECTLY
  62 #endif
  63
  64         if (global_lock_array == NULL) {
  65                 return ENOMEM;
  66         }
  67
  68         for (i = 0; i < NUM_GLOBAL_LOCKS; i++) {
  69                 char *name = NULL;
  70                 if (asprintf(&name, "global_lock_%d", i) == -1) {
  71                         SAFE_FREE(global_lock_array);
  72                         return ENOMEM;
  73                 }
  74                 if (global_tfp->create_mutex(name,
  75                                 &global_lock_array[i],
  76                                 __location__)) {
  77                         smb_panic("smb_thread_set_functions: create mutexes failed");
  78                 }
  79                 SAFE_FREE(name);
  80         }
  81
  82         return 0;
  83 }
  84
  85 #if 0
  86 /* Test. - pthread implementations. */
  87 #include <pthread.h>
  88
  89 #ifdef malloc
  90 #undef malloc
  91 #endif
  92
  93 SMB_THREADS_DEF_PTHREAD_IMPLEMENTATION(tf);
  94
  95 void *pkey = NULL;
  96
  97 /* Test function. */
  98 int test_threads(void)
  99 {
 100         int ret;
 101         void *plock = NULL;
 102         smb_thread_set_functions(&tf);
 103
 104         if ((ret = SMB_THREAD_CREATE_TLS_ONCE("test_tls", pkey)) != 0) {
 105                 printf("Create tls once error: %d\n", ret);
 106         }
 107         if ((ret = SMB_THREAD_CREATE_MUTEX("test", plock)) != 0) {
 108                 printf("Create lock error: %d\n", ret);
 109         }
 110         if ((ret = SMB_THREAD_LOCK(plock, SMB_THREAD_LOCK)) != 0) {
 111                 printf("lock error: %d\n", ret);
 112         }
 113         if ((SMB_THREAD_LOCK(plock, SMB_THREAD_UNLOCK)) != 0) {
 114                 printf("unlock error: %d\n", ret);
 115         }
 116         SMB_THREAD_DESTROY_MUTEX(plock);
 117         SMB_THREAD_DESTROY_TLS_ONCE(pkey);
 118
 119         return 0;
 120 }
 121 #endif