#import "MutextConditionLock.h"

#import <pthread.h>

@interface MutextConditionLock()

@property(nonatomic, assign) pthread_mutex_t mutex; //锁

@property(nonatomic, assign) pthread_cond_t cond; //条件

@property(nonatomic, strong) NSMutableArray *data;

@implementation MutextConditionLock

-(void)__initMutexLock:(pthread_mutex_t *)mutex {

}

-(instancetype)init {

self = [super init];

if (self) {

//初始化属性

pthread_mutexattr_t mutexattr;

pthread_mutexattr_init(&mutexattr);

//设置属性

pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_NORMAL); //普通锁

//销毁属性

pthread_mutexattr_destroy(&mutexattr);

//初始化锁

pthread_mutex_init(&_mutex, &mutexattr);

//初始化条件

//条件属性也可以传NULL

//pthread_condattr_t condattr;

pthread_cond_init(&_cond, NULL);

}

return self;

}

-(void)otherTest {

[[[NSThread alloc]initWithTarget:self selector:@selector(__remove) object:nil] start];

sleep(2.0);

[[[NSThread alloc]initWithTarget:self selector:@selector(__add) object:nil] start];

}

-(void)__add {

//加锁

pthread_mutex_lock(&_mutex);

[self.data addObject:@"1"];

NSLog(@"add 添加元素");

//唤醒因为pthread_cond_wait而等待的线程，代码会继续向下走

pthread_cond_signal(&_cond);

//解锁

pthread_mutex_unlock(&_mutex);

}

-(void)__remove{

//加锁

pthread_mutex_lock(&_mutex);

if (self.data.count == 0) {

// 如果没有数据可以删除，那么线程就会在这个地方睡觉等待，并且会放开这把锁；

// 等待这个条件被放开(pthread_cond_signal)后会重新加锁

pthread_cond_wait(&_cond, &_mutex);

}

[self.data removeLastObject];

NSLog(@"remove 删除元素");

//解锁

pthread_mutex_unlock(&_mutex);

}

-(void)dealloc {

//销毁锁

pthread_mutex_destroy(&_mutex);

//销毁条件

pthread_cond_destroy(&_cond);

}