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