55 lines
1.3 KiB
Objective-C
55 lines
1.3 KiB
Objective-C
/*
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* Copyright 2017 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "FAtomicNumber.h"
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@interface FAtomicNumber() {
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unsigned long number;
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}
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@property (nonatomic, strong) NSLock* lock;
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@end
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@implementation FAtomicNumber
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@synthesize lock;
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- (id)init
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{
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self = [super init];
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if (self) {
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number = 1;
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self.lock = [[NSLock alloc] init];
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}
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return self;
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}
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- (NSNumber *) getAndIncrement {
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NSNumber* result;
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// See: http://developer.apple.com/library/ios/#DOCUMENTATION/Cocoa/Conceptual/Multithreading/ThreadSafety/ThreadSafety.html#//apple_ref/doc/uid/10000057i-CH8-SW14 to improve, etc.
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[self.lock lock];
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result = [NSNumber numberWithUnsignedLong:number];
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number = number + 1;
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[self.lock unlock];
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return result;
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}
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@end
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