C++ SDL_ThreadID函数代码示例

int osd_lock_try(osd_lock *lock)
{
	hidden_mutex_t *mutex = (hidden_mutex_t *) lock;

	LOG(("osd_lock_try"));
	if (mutex->locked && mutex->threadid == SDL_ThreadID())
	{
		/* get the lock */
		SDL_mutexP(mutex->id);
		mutex->locked++;
		mutex->threadid = SDL_ThreadID();
		return 1;
	}
	else if ((mutex->locked == 0))
	{
		/* get the lock */
		mutex->locked++;
		SDL_mutexP(mutex->id);
		mutex->threadid = SDL_ThreadID();
		return 1;
	}
	else
	{
		/* fail */
		return 0;
	}
}

int NetworkThread::ThreadRun(void* /*no_param*/)
{
  MSG_DEBUG("network.thread", "Thread created: %u", SDL_ThreadID());
  ReceiveActions();
  MSG_DEBUG("network.thread", "Thread finished: %u", SDL_ThreadID());
  return 0;
}

//	The evil singelton mechanism.
//
Achievements_System * Achievements_System::get_instance(void)
{
	static Achievements_System as;
	static Uint32 creation_thread = SDL_ThreadID();
	if (SDL_ThreadID() != creation_thread)
		std::cerr << __FUNCTION__ << ": Achievements system called by non-creator thread." << std::endl;
	return &as;
}

static int InternalThreadFunc(void *data)
{
#ifdef __APPLE__
  pthread_once(&keyOnce, MakeTlsKey);
  pthread_setspecific(tlsParamKey, data);

  // Save the Mach port with the handle.
  ((InternalThreadParam* )data)->handle->m_machThreadPort = mach_thread_self();
#else
  pParam = (InternalThreadParam *)data;
#endif

  int nRc = -1;

  // assign termination handler
  struct sigaction action;
  action.sa_handler = handler;
  sigemptyset (&action.sa_mask);
  action.sa_flags = 0;
  //sigaction (SIGABRT, &action, NULL);
  //sigaction (SIGSEGV, &action, NULL);

#ifdef __APPLE__
  void* pool = InitializeAutoReleasePool();
#endif

  try {
     CLog::Log(LOGDEBUG,"Running thread %lu", (unsigned long)SDL_ThreadID());
     nRc = GET_PARAM()->threadFunc(GET_PARAM()->data);
  }
  catch(...) {
    CLog::Log(LOGERROR,"thread 0x%x raised an exception. terminating it.", SDL_ThreadID());
  }

#ifdef __APPLE__
    DestroyAutoReleasePool(pool);
#endif

  if (OwningCriticalSection(g_graphicsContext))
  {
    CLog::Log(LOGERROR,"thread terminated and still owns graphic context. releasing it.");
    ExitCriticalSection(g_graphicsContext);
  }

  SetEvent(GET_PARAM()->handle);
  CloseHandle(GET_PARAM()->handle);
  delete GET_PARAM();
  return nRc;
}

void
SDL_Delay(Uint32 ms)
{
    Uint32 now, then, elapsed;
#if !SDL_THREADS_DISABLED
    int is_event_thread;
    if (riscos_using_threads) {
        is_event_thread = 0;
        if (SDL_EventThreadID()) {
            if (SDL_EventThreadID() == SDL_ThreadID())
                is_event_thread = 1;
        } else if (SDL_ThreadID() == riscos_main_thread)
            is_event_thread = 1;
    } else
        is_event_thread = 1;
#endif

    /*TODO: Next version of Unixlib may allow us to use usleep here */
    /*      for non event threads */

    /* Set the timeout interval - Linux only needs to do this once */
    then = SDL_GetTicks();

    do {
        /* Do background tasks required while sleeping as we are not multithreaded */
#if SDL_THREADS_DISABLED
        RISCOS_BackgroundTasks();
#else
        /* For threaded build only run background tasks in event thread */
        if (is_event_thread)
            RISCOS_BackgroundTasks();
#endif

        /* Calculate the time interval left (in case of interrupt) */
        now = SDL_GetTicks();
        elapsed = (now - then);
        then = now;
        if (elapsed >= ms) {
            break;
        }
        ms -= elapsed;
#if !SDL_THREADS_DISABLED
        /* Need to yield to let other threads have a go */
        if (riscos_using_threads)
            pthread_yield();
#endif

    } while (1);
}

int
main(int argc, char *argv[])
{
    int i;
    int maxproc = 6;

	/* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    /* Load the SDL library */
    if (SDL_Init(0) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s\n", SDL_GetError());
        exit(1);
    }
    atexit(SDL_Quit_Wrapper);

    if ((mutex = SDL_CreateMutex()) == NULL) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create mutex: %s\n", SDL_GetError());
        exit(1);
    }

    mainthread = SDL_ThreadID();
    SDL_Log("Main thread: %lu\n", mainthread);
    atexit(printid);
    for (i = 0; i < maxproc; ++i) {
        char name[64];
        SDL_snprintf(name, sizeof (name), "Worker%d", i);
        if ((threads[i] = SDL_CreateThread(Run, name, NULL)) == NULL)
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread!\n");
    }
    signal(SIGINT, terminate);
    Run(NULL);

    return (0);                 /* Never reached */
}

void SDL_RunThread(void *data)
{
	thread_args *args;
	int (*userfunc)(void *);
	void *userdata;
	int *statusloc;

	/* Perform any system-dependent setup
	   - this function cannot fail, and cannot use SDL_SetError()
	 */
	SDL_SYS_SetupThread();

	/* Get the thread id */
	args = (thread_args *)data;
	args->info->threadid = SDL_ThreadID();

	/* Figure out what function to run */
	userfunc = args->func;
	userdata = args->data;
	statusloc = &args->info->status;

	/* Wake up the parent thread */
	SDL_SemPost(args->wait);

	/* Run the function */
	*statusloc = userfunc(userdata);
}

/* Lock the semaphore */
int SDL_mutexP(SDL_mutex *mutex)
{
#ifdef DISABLE_THREADS
	return 0;
#else
	Uint32 this_thread;

	if ( mutex == NULL ) {
		//SDL_SetError("Passed a NULL mutex"); //maks: no errors
		return -1;
	}

	this_thread = SDL_ThreadID();
	if ( mutex->owner == this_thread ) {
		++mutex->recursive;
	} else {
		/* The order of operations is important.
		   We set the locking thread id after we obtain the lock
		   so unlocks from other threads will fail.
		*/
		SDL_SemWait(mutex->sem);
		mutex->owner = this_thread;
		mutex->recursive = 0;
	}

	return 0;
#endif /* DISABLE_THREADS */
}

/* try Lock the mutex */
int
SDL_TryLockMutex(SDL_mutex * mutex)
{
#if SDL_THREADS_DISABLED
    return 0;
#else
    int retval = 0;
    SDL_threadID this_thread;

    if (mutex == NULL) {
        return SDL_SetError("Passed a NULL mutex");
    }

    this_thread = SDL_ThreadID();
    if (mutex->owner == this_thread) {
        ++mutex->recursive;
    } else {
        /* The order of operations is important.
         We set the locking thread id after we obtain the lock
         so unlocks from other threads will fail.
         */
        retval = SDL_SemWait(mutex->sem);
        if (retval == 0) {
            mutex->owner = this_thread;
            mutex->recursive = 0;
        }
    }

    return retval;
#endif /* SDL_THREADS_DISABLED */
}

void
SDL_SYS_SetupThread(const char *name)
{
    // Make sure a thread ID gets assigned ASAP, for debugging purposes:
    SDL_ThreadID();
    return;
}

int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
{
	pthread_attr_t type;

	/* Set the thread attributes */
	if ( pthread_attr_init(&type) != 0 ) {
		SDL_SetError("Couldn't initialize pthread attributes");
		return(-1);
	}
	pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);

	/* Create the thread and go! */
	if ( pthread_create(&thread->handle, &type, RunThread, args) != 0 ) {
		SDL_SetError("Not enough resources to create thread");
		return(-1);
	}

        if (riscos_using_threads == 0)
        {
           riscos_using_threads = 1;
           riscos_main_thread = SDL_ThreadID();
        }
      
	return(0);
}

HRESULT CDirect3D::LockTexture(void)
{
    // Lock the surface and write the pixels
    static DWORD d3dflags = D3DLOCK_NO_DIRTY_UPDATE;
lock_texture:
    if(GCC_UNLIKELY(!lpTexture || deviceLost)) {
	// Try to reset the device, but only when running main thread
#if D3D_THREAD
	if((SDL_ThreadID() != SDL_GetThreadID(thread)))
#endif
	{
	    Resize3DEnvironment();
	}
	if(GCC_UNLIKELY(!lpTexture || deviceLost)) {
	    LOG_MSG("D3D:Device is lost, locktexture() failed...");
	    return E_FAIL;
	}
	// Success, continue as planned...
    }
    if(GCC_UNLIKELY(lpTexture->LockRect(0, &d3dlr, NULL, d3dflags) != D3D_OK)) {
        if(d3dflags) {
            d3dflags = 0;
            LOG_MSG("D3D:Cannot lock texture, fallback to compatible mode");
            goto lock_texture;
        } else {
            LOG_MSG("D3D:Failed to lock texture!");
	}
        return E_FAIL;
    }

    return S_OK;
}

void SDL_ThreadedTimerCheck(void)
{
	Uint32 now, ms;
	SDL_TimerID t, prev, next;
	SDL_bool removed;

	SDL_mutexP(SDL_timer_mutex);
	list_changed = SDL_FALSE;
	now = SDL_GetTicks();
	for ( prev = NULL, t = SDL_timers; t; t = next ) {
		removed = SDL_FALSE;
		ms = t->interval - SDL_TIMESLICE;
		next = t->next;
		if ( (int)(now - t->last_alarm) > (int)ms ) {
			struct _SDL_TimerID timer;

			if ( (now - t->last_alarm) < t->interval ) {
				t->last_alarm += t->interval;
			} else {
				t->last_alarm = now;
			}
#ifdef DEBUG_TIMERS
			printf("Executing timer %p (thread = %d)\n",
				t, SDL_ThreadID());
#endif
			timer = *t;
			SDL_mutexV(SDL_timer_mutex);
			ms = timer.cb(timer.interval, timer.param);
			SDL_mutexP(SDL_timer_mutex);
			if ( list_changed ) {
				/* Abort, list of timers modified */
				/* FIXME: what if ms was changed? */
				break;
			}
			if ( ms != t->interval ) {
				if ( ms ) {
					t->interval = ROUND_RESOLUTION(ms);
				} else {
					/* Remove timer from the list */
#ifdef DEBUG_TIMERS
					printf("SDL: Removing timer %p\n", t);
#endif
					if ( prev ) {
						prev->next = next;
					} else {
						SDL_timers = next;
					}
					SDL_free(t);
					--SDL_timer_running;
					removed = SDL_TRUE;
				}
			}
		}
		/* Don't update prev if the timer has disappeared */
		if ( ! removed ) {
			prev = t;
		}
	}
	SDL_mutexV(SDL_timer_mutex);
}

int Thread::run_thread(Thread* t) {
    int ret = 0;

    sptr<Thread> sp = t;
    running_threads[SDL_ThreadID()] = sp;
    try {
	ret = sp->run();
    } catch (exception& ex) {
	cout << "Thread " << SDL_ThreadID() << " caught unexpected exception: " << ex.what() << endl;
    }
    t->lock();
    t->running = false;
    t->unlock();
    running_threads.erase(SDL_ThreadID());
    return ret;
}

/* Lock the semaphore */
int SDL_mutexP(SDL_mutex *mutex)
{
#if SDL_THREADS_DISABLED
    return  0;
#else
    Uint32 this_thread;

    if ( mutex == NULL ) {
        SDL_SetError("Passed a NULL mutex");
        return -1;
    }

    this_thread = SDL_ThreadID();
    if ( mutex->owner == this_thread ) {
        ++mutex->recursive;
    } else {
        /* The order of operations is important.
           We set the locking thread id after we obtain the lock
           so unlocks from other threads will fail.
        */
        lock(&mutex->mutex);
        mutex->owner = this_thread;
        mutex->recursive = 0;
    }

    return 0;
#endif /* SDL_THREADS_DISABLED */
}