结束线程时不释放对象为什么会出问题?

hubei_1218

pthread_mutex_t      _Mutex;
pthread_cond_t      _Condition;

class ThreadResource
{
        public :
                ThreadResource() { cout<<"ThreadResource ctor"<<endl;}
                ~ThreadResource() { cout<<"ThreadResource dtor"<<endl;}
               
                void showMessage(const string& str) { cout<<"ThreadResource "<<str<<endl; }
};

void * child1(void *arg)
{
        cout<<"child1 begin running!!!"<<pthread_self()<<endl;
        pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) ;
        pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
        pthread_mutex_lock   ( &_Mutex );
        cout<<"child 1 get lock"<<endl;
         while(true)
         {
                 sleep(2);
          cout<<"child 1 working ..."<<endl;
        }
          pthread_mutex_unlock   ( &_Mutex );
         pthread_exit(0);
}

void * child2(void *arg)
{
        cout<<"child2 begin running!!! "<<pthread_self()<<endl;
        pthread_detach(pthread_self());
        pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) ;
        pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
        ThreadResource * res = new ThreadResource;
//        char * buf = new char[1000];
        while(true)
          ;
}

int main(void)
{
   pthread_t tid1,tid2;
   int iCancelRet = 0;
   cout<<"EINVAL = "<<EINVAL<<endl;
   pthread_mutex_init( &_Mutex, NULL );
   pthread_cond_init(&_Condition, NULL);
   
   pthread_create(&tid1,NULL,child1,NULL);
   sleep(2);
   pthread_create(&tid2,NULL,child2,NULL);
   
   iCancelRet = pthread_cancel(tid2);
   cout<<"iCancelRet="<<iCancelRet<<endl;
//  cout<<"join result 2 = "<<pthread_join(tid2,NULL)<<endl;
   cout<<"join thread 1 now"<<endl;
   cout<<"EDEADLK="<<EDEADLK<<endl;
   cout<<"join result 1 = "<<pthread_join(tid1,NULL)<<endl;
   cout<<"join thread 1 ok"<<endl;
   pthread_cond_destroy(&_Condition);
   pthread_mutex_destroy( &_Mutex );
   
return 0;
}
代码如上,问题是这样的:
如果child2 中 ThreadResource * res = new ThreadResource;不被注释的话,主程序运行到cout<<"join result 1 = "<<pthread_join(tid1,NULL)<<endl;就会core掉,但是如果child2 中 char * buf = new char[1000];不被注释,ThreadResource * res = new ThreadResource;被注释的时候就不会core.区别仅仅是一个是复杂类型的对象,另一个是简单类型.为什么????

hubei_1218

没有人知道?

linternt

您既然调用了pthread_detach(pthread_self());
那您这个线程退出时就应该释放线程的私有数据，否则可能造成内存丢失，至于为什么char*为什么不会CORE，这应该是编译器做的不同处理吧。