interrupt | 易学教程

Interrupts and exceptions

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I've seen several question on here about exceptions , and some of them hint at interrupts as exceptions , but none make the connection clear. What is an interrupt? What is an exception? (please explain what exceptions are for each language you know, as there are some differences) When is an exception an interrupt and vice-versa? An interupt is a CPU signal generated by hardware, or specific CPU instructions. These cause interupt handlers to be executed. Things such as I/O signals from I/O hardware generate interupts. An exception can be thought of as a software-version of an interupt, that

Future.cancel() method is not working

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问题 The code that I have creates a Callable instance and using ExecutorService a new thread is being created. I want to kill this thread after certain amount of time if the thread is not done with its execution. After going through the jdk documentation I've realized that Future.cancel() method can be used to stop the execution of the thread, but to my dismay its not working. Of course future.get() method is sending an interrupt to the Thread after the stipulated time (in my case its 2 seconds)

Who interrupts my thread?

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问题 I understand what an InterruptedException does and why it is thrown. However in my application I get it when waiting for SwingUtilities.invokeAndWait() on a thread that is only known by my application, and my application never calls Thread.interrupt() on any thread, also it never passes the reference of the thread on to anyone. So my question is: Who interrupts my thread? Is there any way to tell? Is there a reason why the InterruptedException doesn't contain the name of the Thread that

Does the finally block execute if the thread running the function is interrupted?

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问题 If I have a function with a try/finally section, and the thread running it is interrupted while in the try block, will the finally block execute before the interruption actually occurs? 回答1: According to the Java Tutorials, "if the thread executing the try or catch code is interrupted or killed, the finally block may not execute even though the application as a whole continues." Here's the full passage: The finally block always executes when the try block exits. This ensures that the finally

Does calling Thread.interrupt() before a Thread.join() cause the join() to throw an InterruptedException immediately?

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问题 Basically, what the question title says. Thread t = new Thread(someRunnable); t.start(); t.interrupt(); t.join(); //does an InterruptedException get thrown immediately here? From my own tests, it seems to, but just wanted to be sure. I'm guessing Thread.join() checks the interrupted status of the thread before doing its "wait" routine? 回答1: interrupt() interrupts the thread you interrupted, not the thread doing the interrupting. c.f. Thread.currentThread().interrupt(); t.join(); // will throw

Enabling floating point interrupts on Mac OS X Intel

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On Linux, feenableexcept and fedisableexcept can be used to control the generation of SIGFPE interrupts on floating point exceptions. How can I do this on Mac OS X Intel? Inline assembly for enabling floating point interrupts is provided in http://developer.apple.com/documentation/Performance/Conceptual/Mac_OSX_Numerics/Mac_OSX_Numerics.pdf , pp. 7-15, but only for PowerPC assembly. Exceptions for sse can be enabled using _MM_SET_EXCEPTION_MASK from xmmintrin.h . For example, to enable invalid (nan) exceptions, do #include <xmmintrin.h> ... _MM_SET_EXCEPTION_MASK(_MM_GET_EXCEPTION_MASK() & ~

Uninterruptable process in Windows(or Linux)?

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Is there any way to make a program that cannot be interrupted (an uninterrupted program)? By that, I mean a process that can't be terminated by any signal, kill command, or any other key combinations in any System: Linux, windows etc. First, I am interested to know whether it's possible or not. And if yes, upto what extend it is possible? I mostly write code in C, C++, and python; but I don't know any of such command(s) available in these programming languages. Is it possible with assembly language, & how ? Or in high level language c with embedded assembly code(inline assembly)? I know some

C# read only Serial port when data comes

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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 = ComWindow.txtbCom.Text + Environment.NewLine + Schnittstelle.ReadExisting(); ComWindow.txtbCom

Real-time interrupts in Python

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问题 I have a Python 2.7 program running an infinite while loop and I want to incorporate a timer interrupt. What I aim to do is to set off a timer at some point in the loop, and when 5 seconds have elapsed I want the code to branch to a specific part of the while loop. What I have been doing so far is the following: in each iteration of the while loop I am checking how much time has elapsed when I reach that point in the code using time.clock() and if the difference exceeds 5 I run the chunk of

What is the difference between Trap and Interrupt?

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What is the difference between Trap and Interrupt? If the terminology is different for different systems, then what do they mean on x86? 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, the code expects the trap to happen and relies on this fact. An interrupt is something generated by the