cocos2d-x多线程的用法

//TestLayer.h
class CTestLayer :
public CCLayer
{
public:
CTestLayer(void);
~CTestLayer(void);

CREATE_FUNC(CTestLayer);
virtual bool init();

pthread_t sellA_pid,sellB_pid;//线程id
static int tickets;//票数

static void* threadA(void* p);//线程A回调
static void* threadB(void* p);//线程B回调
};
//TestLayer.cpp
#include “TestLayer.h”

int CTestLayer::tickets=100;//初始化票数100
CTestLayer::CTestLayer(void)
{
}
CTestLayer::~CTestLayer(void)
{
}

bool CTestLayer::init()
{
bool bRet=false;
do
{
CC_BREAK_IF(!CCLayer::init());
pthread_create(&sellA_pid,NULL,threadA,0);//创建线程A
pthread_create(&sellB_pid,NULL,threadB,0);//创建线程B

bRet=true;
} while (0);
return bRet;
}

void* CTestLayer::threadA(void* p)
{
while(true)
{
if(tickets>0)
{
CCLog(“A Sell %d”,tickets–);//输出售票，每次减1
}
else {
break;
}
}
return NULL;
}

void* CTestLayer::threadB(void* p)
{
while(true)
{
if (tickets>0)
{
CCLog(“B Sell %d”,tickets–);
}
else
{
break;
}
}
return NULL;
}

代码很简单，不多说了。我们来看一下输出，会发现有很多不可思议的现象出现，因为每个人每次运行的结果都不一样，所以这里不贴结果了，不可思议的现象可能有：

void* CTestLayer::threadA(void* p)
{
while(true)
{
pthread_mutex_lock(&mutex);//加锁
if(tickets>0)
{
Sleep(100);
CCLog(“A Sell %d”,tickets–);
pthread_mutex_unlock(&mutex);//解锁
}
else {
pthread_mutex_unlock(&mutex);//解锁
break;
}
}
return NULL;
}

B Sell 16
A Sell 15
B Sell 14
B Sell 13
B Sell 12
B Sell 11
B Sell 10
B Sell 9
B Sell 8
B Sell 7
B Sell 6
B Sell 5
B Sell 4
B Sell 3
B Sell 2
B Sell 1