如何退出 [NSRunLoop runUntilDate]？

发布于 2024-08-17 07:57:39 字数 996 浏览 6 评论 0原文

我正在编写一个应用程序，它必须与通过 USB 连接的设备进行通信。该应用程序按固定时间轮流从设备发送和接收数据。所有 Rx/Tx 都发生在单独的线程中，否则 UI 将被阻塞。基本结构基本上是这样的。（自动释放池和省略的内容）

-(void)comThread:(id)arg {
  while(state == kIsConnected) {
    // let timers run
    [runLoop runUntilDate:[NSDate distantFuture]];
    // handle data
    if(rxTxState == kRx) {
      // do some stuff to pass data to upper layers
      rxTxState = kTx;
    }
    if(rxTxState == kTx) {
      // do some stuff to send data
      rxTimeoutTimer = [NSTimer scheduledTimer....];
    }
  } 
}

发送数据后，应用程序等待接收数据或触发 rxTimeoutTimer ，这会导致数据包重新传输。 rx 操作之所以有效，是因为底层使用异步系统调用并调用 rx 处理程序，其基本上如下所示。

-(void)receiveData:(NSData*)data{
  [rxQueue addObject:data];
  [rxTimeoutTimer invalidate];  // cancel timeout
}

有没有一种（简单）方法可以使 [runLoop runUntilDate:] 从 receiveData: 退出？ Apple 文档表示，删除所有计时器源并不能保证 RunLoop 退出。我读到了一些关于调用 performSelector:onThread:... 的内容，但它要么不起作用，要么我没有明白这一点。

谢谢。

原文

I am writing an application which has to communicate with a device connected via USB. The app sends and receives data in turns from the device on a fixed timing. All Rx/Tx happens in a separate thread because otherwise the UI would be blocked. The basic structure looks basically like this. (autorelease pools and stuff omitted)

-(void)comThread:(id)arg {
  while(state == kIsConnected) {
    // let timers run
    [runLoop runUntilDate:[NSDate distantFuture]];
    // handle data
    if(rxTxState == kRx) {
      // do some stuff to pass data to upper layers
      rxTxState = kTx;
    }
    if(rxTxState == kTx) {
      // do some stuff to send data
      rxTimeoutTimer = [NSTimer scheduledTimer....];
    }
  } 
}

After sending data, the app waits for either data to be received or the rxTimeoutTimer to fire which leads to retransmission of the packet. The rx-operation works since the underlying layers use async system calls and calls a rx-handler which look basically like this.

-(void)receiveData:(NSData*)data{
  [rxQueue addObject:data];
  [rxTimeoutTimer invalidate];  // cancel timeout
}

Is there an (easy) way to make the [runLoop runUntilDate:] exit from receiveData:? The Apple docs say that removing all timer sources does not guarantee the RunLoop to exit. I read something about calling performSelector:onThread:... but it either did not work or I did not get the point.

Thanks.

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蹲墙角沉默 2024-08-24 07:57:39

CFRunLoopStop([runLoop getCFRunLoop]);

CFRunLoopStop([runLoop getCFRunLoop]);

回复收藏 0 原文

空宴 2024-08-24 07:57:39

标准模式是运行 runloop 一段超时时间（例如 0.5 秒），然后迭代直到任务完成：

while(state == kIsConnected) {
  while(!iterationDone) {
    [runLoop runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.5]];
    //do other stufff
  }
}

-(void)receiveData:(NSData*)data{
  [rxQueue addObject:data];
  [rxTimeoutTimer invalidate];  // cancel timeout
  iterationDone = YES;
}

The standard pattern is to run the runloop for some timeout period (e.g. 0.5 seconds), and then iterate until the task is accomplished:

while(state == kIsConnected) {
  while(!iterationDone) {
    [runLoop runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.5]];
    //do other stufff
  }
}

-(void)receiveData:(NSData*)data{
  [rxQueue addObject:data];
  [rxTimeoutTimer invalidate];  // cancel timeout
  iterationDone = YES;
}

回复收藏 0 原文

热风软妹 2024-08-24 07:57:39

CFRunLoopStop([runLoop getCFRunLoop]);
和
取消执行选择器

对我不起作用，
请参阅我的运行代码 [NSRunLoop currentRunLoop]

timerUpdateLocation = [NSTimer scheduledTimerWithTimeInterval:[time intValue] target:self selector:@selector(startTrackingBg) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timerUpdateLocation forMode:NSRunLoopCommonModes];
[[NSRunLoop currentRunLoop] run];

要停止它，我只需使计时器无效。

[timerUpdateLocation 无效];

CFRunLoopStop([runLoop getCFRunLoop]);
and
CancelPerformSelector

didnot work for me ,
See my Code for running [NSRunLoop currentRunLoop]

timerUpdateLocation = [NSTimer scheduledTimerWithTimeInterval:[time intValue] target:self selector:@selector(startTrackingBg) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timerUpdateLocation forMode:NSRunLoopCommonModes];
[[NSRunLoop currentRunLoop] run];

To Stop it I Just invalidate timer.

[timerUpdateLocation invalidate];

回复收藏 0 原文

余生再见 2024-08-24 07:57:39

这样做就可以退出了。但几秒钟后就会退出。

 -(void)comThread:(id)arg {
      BOOL ret = YES;
      rxTimeoutTimer = [NSTimer scheduledTimer....];
      while(ret) {
        // let timers run
        ret = [runLoop runUntilDate:[NSDate distantFuture]];
      } 
    }
    -(void)receiveData:(NSData*)data{
      [rxQueue addObject:data];
      [rxTimeoutTimer invalidate];  // cancel timeout
      iterationDone = YES;
    }

kennytm 的答案似乎是正确的。

Do like this can exit. but it will exit after a few seconds.

 -(void)comThread:(id)arg {
      BOOL ret = YES;
      rxTimeoutTimer = [NSTimer scheduledTimer....];
      while(ret) {
        // let timers run
        ret = [runLoop runUntilDate:[NSDate distantFuture]];
      } 
    }
    -(void)receiveData:(NSData*)data{
      [rxQueue addObject:data];
      [rxTimeoutTimer invalidate];  // cancel timeout
      iterationDone = YES;
    }

the kennytm's answer seems right.

回复收藏 0 原文

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