unbound/compat/arc4_lock.c

   1 /* arc4_lock.c - global lock for arc4random
   2 *
   3  * Copyright (c) 2014, NLnet Labs. All rights reserved.
   4  *
   5  * This software is open source.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * Redistributions of source code must retain the above copyright notice,
  12  * this list of conditions and the following disclaimer.
  13  *
  14  * Redistributions in binary form must reproduce the above copyright notice,
  15  * this list of conditions and the following disclaimer in the documentation
  16  * and/or other materials provided with the distribution.
  17  *
  18  * Neither the name of the NLNET LABS nor the names of its contributors may
  19  * be used to endorse or promote products derived from this software without
  20  * specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  28  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  29  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  30  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  31  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  32  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34 #include "config.h"
  35 #define LOCKRET(func) func
  36 #include "util/locks.h"
  37
  38 void _ARC4_LOCK(void);
  39 void _ARC4_UNLOCK(void);
  40
  41 #ifdef THREADS_DISABLED
  42 void _ARC4_LOCK(void)
  43 {
  44 }
  45
  46 void _ARC4_UNLOCK(void)
  47 {
  48 }
  49 #else /* !THREADS_DISABLED */
  50
  51 static lock_quick_t arc4lock;
  52 static int arc4lockinit = 0;
  53
  54 void _ARC4_LOCK(void)
  55 {
  56         if(!arc4lockinit) {
  57                 arc4lockinit = 1;
  58                 lock_quick_init(&arc4lock);
  59         }
  60         lock_quick_lock(&arc4lock);
  61 }
  62
  63 void _ARC4_UNLOCK(void)
  64 {
  65         lock_quick_unlock(&arc4lock);
  66 }
  67 #endif /* THREADS_DISABLED */