interrupt | 易学教程

C# read only Serial port when data comes

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问题 I want read my serial port but only when data comes(I want not polling). This is how I do it. Schnittstelle = new SerialPort("COM3"); Schnittstelle.BaudRate = 115200; Schnittstelle.DataBits = 8; Schnittstelle.StopBits = StopBits.Two; .... And then I start a thread beginn = new Thread(readCom); beginn.Start(); and in my readCom I'm reading continuous (polling :( ) private void readCom() { try { while (Schnittstelle.IsOpen) { Dispatcher.BeginInvoke(new Action(() => { ComWindow.txtbCom.Text =

What is the difference between Trap and Interrupt?

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问题 What is the difference between Trap and Interrupt? If the terminology is different for different systems, then what do they mean on x86? 回答1: A trap is an exception in a user process. It's caused by division by zero or invalid memory access. It's also the usual way to invoke a kernel routine (a system call) because those run with a higher priority than user code. Handling is synchronous (so the user code is suspended and continues afterwards). In a sense they are "active" - most of the time,

prevent linux thread from being interrupted by scheduler

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问题 How do you tell the thread scheduler in linux to not interrupt your thread for any reason? I am programming in user mode. Does simply locking a mutex acomplish this? I want to prevent other threads in my process from being scheduled when a certain function is executing. They would block and I would be wasting cpu cycles with context switches. I want any thread executing the function to be able to finish executing without interruption even if the threads' timeslice is exceeded. 回答1: How do you

I don't understand how to use Interrupt 21, AH=0ah

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问题 My information is coming from here. The assignment asks for a program that reads in no more than 20 characters, converts those characters to upper case, and then prints the input as capitals. I have no idea how to access the input from int21/AH=0ah. I really can\'t ask a more precise question unless I understand what is linked above. Can someone explain? Also, I\'m using TASM if that makes any difference. Also, I\'m testing this on freedos. UPDATE1: Alright, thanks to your help, I believe I

Why invoke Thread.currentThread.interrupt() in a catch InterruptException block?

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Why invoke the method Thread.currentThread.interrupt() in the catch block? Péter Török This is done to keep state . When you catch the InterruptException and swallow it, you essentially prevent any higher level methods/thread groups from noticing the interrupt. Which may cause problems. By calling Thread.currentThread().interrupt() , you set the interrupt flag of the thread, so higher level interrupt handlers will notice it and can handle it appropriately. Java Concurrency in Practice discusses this in more detail in Chapter 7.1.3: Responding to Interruption . Its rule is: Only code that

How to interrupt a BlockingQueue which is blocking on take()?

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问题 I have a class that takes objects from a BlockingQueue and processes them by calling take() in a continuous loop. At some point I know that no more objects will be added to the queue. How do I interrupt the take() method so that it stops blocking? Here\'s the class that processes the objects: public class MyObjHandler implements Runnable { private final BlockingQueue<MyObj> queue; public class MyObjHandler(BlockingQueue queue) { this.queue = queue; } public void run() { try { while (true) {

How can I interrupt a ServerSocket accept() method?

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In my main thread I have a while(listening) loop which calls accept() on my ServerSocket object, then starts a new client thread and adds it to a Collection when a new client is accepted. I also have an Admin thread which I want to use to issue commands, like 'exit', which will cause all the client threads to be shut down, shut itself down, and shut down the main thread, by turning listening to false. However, the accept() call in the while(listening) loop blocks, and there doesn't seem to be any way to interrupt it, so the while condition cannot be checked again and the program cannot exit!

Why invoke Thread.currentThread.interrupt() in a catch InterruptException block?

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问题 Why invoke the method Thread.currentThread.interrupt() in the catch block? 回答1: This is done to keep state . When you catch the InterruptException and swallow it, you essentially prevent any higher level methods/thread groups from noticing the interrupt. Which may cause problems. By calling Thread.currentThread().interrupt() , you set the interrupt flag of the thread, so higher level interrupt handlers will notice it and can handle it appropriately. Java Concurrency in Practice discusses this

How do you kill a Thread in Java?

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问题 How do you kill a java.lang.Thread in Java? 回答1: See this thread by Sun on why they deprecated Thread.stop(). It goes into detail about why this was a bad method and what should be done to safely stop threads in general. The way they recommend is to use a shared variable as a flag which asks the background thread to stop. This variable can then be set by a different object requesting the thread terminate. 回答2: Generally you don't.. You ask it to interrupt whatever it is doing using Thread