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      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 #ifdef ENABLE_LOCK_CHECKS
     37 #undef ENABLE_LOCK_CHECKS
     38 #endif
     39 #include "util/locks.h"
     40 
     41 void _ARC4_LOCK(void);
     42 void _ARC4_UNLOCK(void);
     43 
     44 #ifdef THREADS_DISABLED
     45 void _ARC4_LOCK(void)
     46 {
     47 }
     48 
     49 void _ARC4_UNLOCK(void)
     50 {
     51 }
     52 
     53 void _ARC4_LOCK_DESTROY(void)
     54 {
     55 }
     56 #else /* !THREADS_DISABLED */
     57 
     58 static lock_quick_type arc4lock;
     59 static int arc4lockinit = 0;
     60 
     61 void _ARC4_LOCK(void)
     62 {
     63 	if(!arc4lockinit) {
     64 		arc4lockinit = 1;
     65 		lock_quick_init(&arc4lock);
     66 	}
     67 	lock_quick_lock(&arc4lock);
     68 }
     69 
     70 void _ARC4_UNLOCK(void)
     71 {
     72 	lock_quick_unlock(&arc4lock);
     73 }
     74 
     75 void _ARC4_LOCK_DESTROY(void)
     76 {
     77 	if(arc4lockinit) {
     78 		arc4lockinit = 0;
     79 		lock_quick_destroy(&arc4lock);
     80 	}
     81 }
     82 #endif /* THREADS_DISABLED */
     83