keychain/ckks/CKKSCondition.m

   1 /*
   2  * Copyright (c) 2017 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #import "keychain/ckks/CKKSCondition.h"
  25
  26 @interface CKKSCondition ()
  27 @property dispatch_semaphore_t semaphore;
  28 @end
  29
  30 @implementation CKKSCondition
  31
  32 -(instancetype)init
  33 {
  34     if((self = [super init])) {
  35         _semaphore = dispatch_semaphore_create(0);
  36     }
  37     return self;
  38 }
  39
  40 -(void)fulfill {
  41     dispatch_semaphore_signal(self.semaphore);
  42 }
  43
  44 -(long)wait:(uint64_t)timeout {
  45     long result = dispatch_semaphore_wait(self.semaphore, dispatch_time(DISPATCH_TIME_NOW, timeout));
  46
  47     // If we received a go-ahead from the semaphore, replace the signal
  48     if(0 == result) {
  49         dispatch_semaphore_signal(self.semaphore);
  50     }
  51
  52     return result;
  53 }
  54
  55 @end
  56