[code-design]TvServer 之CRunOnce

CRunOnce is mainly described how to create exit thread

class CRunOnce: public IThread{private:    pthread_mutex_t m_mutex;    int m_state;    pthread_t m_thread;    IParams *m_params;    IRunnable *m_runnable;    static void thread_exit(int sig)    {        TvServerService_detachThread();        pthread_exit(0);    }    static void * looper_func(void *p)    {        CRunOnce *r = (CRunOnce*)p;        //assert(r && r->m_runnable);        struct sigaction actions;        memset(&actions, 0, sizeof(actions));         // sigemptyset(&actions.sa_mask);        actions.sa_flags = SA_SIGINFO;         actions.sa_handler = CRunOnce::thread_exit;        sigaction(SIGUSR2,&actions,NULL);        TvServerService_attachThread();        r->m_runnable->Run(r->m_params);        TvServerService_detachThread();        return NULL;    }public:    virtual void Post(IRunnable *r, bool replace, IParams *p, unsigned int after )    {        if(!m_runnable && r)        {            m_runnable = r;            m_params = p;            pthread_mutex_lock(&m_mutex);            if(m_state == RUN_STATE_INIT)            {                m_state = RUN_STATE_RUNNING;                int ret = pthread_create(&m_thread, NULL,                       CRunOnce::looper_func, this);                // pthread_detach(m_thread);            }            //assert(!ret);            pthread_mutex_unlock(&m_mutex);        }    }    CRunOnce()    {        m_mutex = PTHREAD_MUTEX_INITIALIZER;        m_state = RUN_STATE_INIT;        m_runnable = NULL;          m_params = NULL;    }    virtual void Halt(void)    {        bool tohalt=false;        pthread_mutex_lock(&m_mutex);        if(m_state == RUN_STATE_RUNNING)        {            m_state = RUN_STATE_HALTED;            tohalt = true;        }        pthread_mutex_unlock(&m_mutex);        if(tohalt)        {            pthread_kill(m_thread, SIGUSR2);            pthread_join(m_thread,NULL);        }    }    virtual ~CRunOnce()    {        Halt();        if(m_runnable)        {            if(m_params) m_params->Release();            delete m_runnable;        }    }};