cocos2dx学习笔记（多线程）

多线程的实现：

PthreadTest.h

#ifndef __MTNotificationQueue_h
#define __MTNotificationQueue_h

#include "cocos2d.h"
#include 
#include"pthread\pthread.h"
USING_NS_CC;
using namespace std;
//线程安全的消息队列
class MTNotificationQueue : public CCObject 
{  
	//队列对象
	static MTNotificationQueue * mInstance;

 	class CGarbo
 	{
 		public:
 			~CGarbo()
 			{
 				if (MTNotificationQueue::mInstance)
 					delete MTNotificationQueue::mInstance;
					mInstance = NULL;
 			}
 	};
 
 	static CGarbo Garbo; 

    typedef struct  
    {  
        string name;  
        CCObject* object;  
    } NotificationArgs;  
     //消息队列
     vector notifications;   
    MTNotificationQueue(void);  
 
public:  
    static MTNotificationQueue* sharedNotificationQueue();  
    void postNotifications(float dt);  
    ~MTNotificationQueue(void);  
    void postNotification(const char* name, CCObject* object);  
};  

#endif

PthreadTest.cpp

#include "PthreadTest.h"
//互斥锁，全局唯一
pthread_mutex_t sharedNotificationQueueLock;
//管理互斥锁的生命周期
class LifeManager_PThreadMutex  
{  
    pthread_mutex_t* mutex;  
 
public:  
    LifeManager_PThreadMutex(pthread_mutex_t* mut) : mutex(mut)  
    {  
		//初始化
        pthread_mutex_init(mutex, NULL);  
    }  
 
    ~LifeManager_PThreadMutex()  
    {  
		//销毁
        pthread_mutex_destroy(mutex);  
    }  
}__LifeManager_sharedNotificationQueueLock(&sharedNotificationQueueLock);  
//生命周期锁类，管理锁开关
class LifeCircleMutexLocker  
{  
    pthread_mutex_t* mutex;  
 
public:  
    LifeCircleMutexLocker(pthread_mutex_t* aMutex) : mutex(aMutex)  
    {  
		//上锁
        pthread_mutex_lock(mutex);  
    }  
    ~LifeCircleMutexLocker(){  
		//解锁
        pthread_mutex_unlock(mutex);  
    }  
};  
 
#define LifeCircleMutexLock(mutex) LifeCircleMutexLocker __locker__(mutex) 




MTNotificationQueue* MTNotificationQueue::mInstance = NULL;

MTNotificationQueue::MTNotificationQueue(void)
{
}

MTNotificationQueue::~MTNotificationQueue(void)
{
}
//消息队列的单例
MTNotificationQueue* MTNotificationQueue::sharedNotificationQueue()
{
	if (!mInstance) 
	{
		mInstance = new MTNotificationQueue();
	}

	return mInstance;
}
//消息队列的处理
void MTNotificationQueue::postNotifications(float dt)  
{  
    LifeCircleMutexLock(&sharedNotificationQueueLock);  
 
	for(uint16_t i = 0; i < notifications.size(); i++) {  
        NotificationArgs &arg = notifications[i];  
//    void postNotification(const char *name);
//       发送一个消息 
        CCNotificationCenter::sharedNotificationCenter()-> 
            postNotification(arg.name.c_str(), arg.object);  
    }  
    notifications.clear();  
}  
//单个消息加入
void MTNotificationQueue::postNotification(const char* name, CCObject* object)  
{  
    LifeCircleMutexLock(&sharedNotificationQueueLock);  
 
    NotificationArgs arg;  
    arg.name = name;  
 
    if(object != NULL)  
		arg.object = object;   //object->copy();
    else  
        arg.object = NULL;  
 
    notifications.push_back(arg);  
}  

BackgroundLayer.cpp

#include "BackgroundLayer.h"
#include "User.h"
#include"PthreadTest.h"
USING_NS_CC;

CCScene* BackgroundLayer::scene()
{
    // 'scene' is an autorelease object
    CCScene *scene = CCScene::create();
    
    // 'layer' is an autorelease object
    BackgroundLayer *layer = BackgroundLayer::create();

    // add layer as a child to scene
    scene->addChild(layer);

    // return the scene
    return scene;
}

// on "init" you need to initialize your instance

CCImage *bgImage;
void* loadImages(void* arg)  
{  
    bgImage = new CCImage();  
    bgImage->initWithImageFileThreadSafe("HelloWorld.png");  
 // 发送一个已经完成加载的消息
    MTNotificationQueue::sharedNotificationQueue()-> 
        postNotification("loadImageFinish", NULL);  
 
    return NULL;  
} 
void BackgroundLayer::loadImageFinish(CCObject* sender)  
{  
    CCSize winSize = CCDirector::sharedDirector()->getWinSize();  
	//加载图片
    CCTexture2D* texture = CCTextureCache::sharedTextureCache()-> 
        addUIImage(bgImage, "HelloWorld.png");  
	//释放bgImage内存，因为bgImage为进程间的共享数据
    bgImage->release();  
 
	CCSprite* bg = CCSprite::createWithTexture(texture);  
    CCSize size = bg->getContentSize();  
    bg->setPosition(ccp(winSize.width / 2, winSize.height / 2));  
 
    float f = max(winSize.width/size.width,winSize.height/size.height);  
    bg->setScale(f);  
 
    this->addChild(bg);  
}  
bool BackgroundLayer::init()  
{  
//启动消息队列定时器，使postNotifications每帧都被调用
 CCDirector::sharedDirector()->getScheduler()->scheduleSelector( 
	 schedule_selector(MTNotificationQueue::postNotifications), 
             MTNotificationQueue::sharedNotificationQueue(), 
                1.0 / 60.0, 
                   false);

    bool bRet = false;  
    do {  
        CC_BREAK_IF(! CCLayer::init());  
//注册消息 
//		void addObserver(CCObject *target,  //接收消息的对象  
//    SEL_CallFuncO selector,         //响应消息的函数  
//    const char *name,               //待接收的消息  
//    CCObject *obj);                 //指定消息的发送者，目前暂时为无用参数  
    CCNotificationCenter::sharedNotificationCenter()->addObserver(  
            this,  
            callfuncO_selector(BackgroundLayer::loadImageFinish),  
            "loadImageFinish",  
            NULL);  
 
        pthread_t tid;  
// 创建线程，loadImages为入口指针
        pthread_create(&tid, NULL, &loadImages, NULL);  
 
        bRet = true;  
    } while (0);  
 
   return bRet;  
}