Objective-C实现生产者消费者问题
生产者-消费者问题是一个经典的多线程问题，它涉及两个或多个线程之间的协作。生产者负责生成数据并将其放入缓冲区，而消费者则从缓冲区中取出数据进行处理。在Objective-C中，我们可以使用NSCondition来实现这一问题。
实现思路
为了确保生产者不会在缓冲区满时继续生产，消费者在缓冲区空时不会继续消费，我们需要使用同步机制。在Objective-C中，NSCondition是一个强大的工具，可以帮助我们实现这一点。
#import <Foundation/Foundation.h>
#define BUFFER_SIZE 5
@interface ProducerConsumerViewController : NSViewController
{ NSCondition *condition; NSMutableArray *buffer; NSOperationQueue *queue; }@implementation ProducerConsumerViewController
-
(void)viewDidLoad)
{ [super viewDidLoad]; self.buffer = [NSMutableArray new]; self.queue = [NSOperationQueue new]; self.condition = [NSCondition new]; } -
(void *)producerThread:(NSThread *)thread
{ while (true) { [self.condition wait]; if ([self.buffer count] < BUFFER_SIZE) { [self.buffer addObject:[NSDate new]]; } else { // 缓冲区已满，生产者暂停 sleep(1); } } } -
(void *)consumerThread:(NSThread *)thread
{ while (true) { [self.condition wait]; if ([self.buffer count] > 0) { [self.buffer removeObjectAtIndex:0]; } else { // 缓冲区为空，消费者暂停 sleep(1); } } } -
(void)startThreads
{ [self.queue addExecutionThreadWithName:@"生产者" target:self selector:@selector(producerThread:)]; [self.queue addExecutionThreadWithName:@"消费者" target:self selector:@selector(consumerThread:)]; } -
(void)stopThreads
{ [self.queue cancelAllOperations]; }
