interrupt

问题 I've read (and studied) about Interrupt Handling. What I always fail to understand, is how do we know where to return to (PC / IP) from the Interrupt Handler. As I understand it: An Interrupt is caused by a device (say the keyboard) The relevant handler is called - under the running process. That is, no context switch to the OS is performed. The Interrupt Handler finishes, and passes control back to the running application. The process depicted above, which is my understanding of Interrupt

问题 My scenario is as follows: I am implementing a server that must timeout or produce a response within the specified timeout period for each request. Thus each request is ensured a response from the server's point of view (the response, of course, might not reach the client due to transport layer failure, etc...). In order to implement the above semantics, each request spawns a thread (actually retrieves an available one from a thread pool) and awaits its response via a notify on a sync object.

问题 Is it possible to use a class method as the Interrupt Service Routine? I have an ISR written and working in C using a function: static void interrupt far ISR(...) {} I've tried in C++ to create a method (prototype): void interrupt far ISR(...); Then the implementation: #pragma interrupt void interrupt far MyClass::ISR(...) { ... } But I get all sorts of errors when I try to use this with 'setvect': setvect(muint16Vector, &ISR); I'm trying to write a class to service a serial port, the ISR

问题 here is a test case. try: targ = raw_input("Please enter target: ") except KeyboardInterrupt: print "Cancelled" print targ My output is as follows when I press ctrl+c- NameError: name 'targ' is not defined My intention is for the output to be "Cancelled". Any thoughts to as why this happens when I attempt to catch a KeyboardInterrupt during raw_input? Thanks! 回答1: In above code, when exception raised, targ is not defined. You should print only when exception is not raised. try: targ = raw

问题 Assume that the gpio X can be exported in sysfs as an input pin, after doing that a directory called gpioX will be created into /sys/class/gpio/. gpioX/ contains few file such as "value" which represents the current state of the gpio X (high or low). What happens (in kernel space) when the signal applied to the pin X changes its state (for example from low to high)? I mean, before the transition gpioX/value contains "low", but after that it will contain "high" value. How is this file updated

问题 I have a quick question which apparently isn't said online from what I've read: I know millis() on an Arduino doesn't change during a custom interrupt, but does the associated timer still counts in the background ? My program is time-sensitive and I would like to know if I should increase its value (how?) each time one of my interrupts is handled so that the main program's clock doesn't drift. Thanks in advance, Regards, Mister Mystère 回答1: The CPU-internal timer will count even when

问题 In main , I give the user the ability to enter a command to stop the application: while( run_processes && cin >> command_line_input ){ I'd also like to stop the application elsewhere by setting run_processes = false; . However, when I set run_processes to false , the above loop doesn't stop without the user entering input. How can I properly interrupt the loop without the user entering input? 回答1: It is not possible to interrupt std::cin in a portable way. You could however resolve to non

问题 I would like to use interrupts with GPIO on userspace using sysfs. I use these commands : [root@at91]:gpio109 > echo 109 > export [root@at91]:gpio109 > cd gpio109/ [root@at91]:gpio109 > ll -rw-r--r-- 1 root 0 4096 Jan 1 00:17 direction drwxr-xr-x 2 root 0 0 Jan 1 00:17 power lrwxrwxrwx 1 root 0 0 Jan 1 00:17 subsystem -> ../../gpio -rw-r--r-- 1 root 0 4096 Jan 1 00:17 uevent -rw-r--r-- 1 root 0 4096 Jan 1 00:17 value The gpio works well but I can't use interrupts. I read everywhere i must

问题 I want to manage a list of Futures objects returned by my TaskExecutor. I've something like this List<Future<String>> list void process(ProcessThis processThis) { for ( ...) { Future<String> future = taskExecutor.submit(processThis); list.add(future) } } void removeFutures() { for(Future future : list) { assert future.cancel(true); } ProcessThis is a task that implements Callable< String> and checks for Thread.interrupted() status public String call() { while (true) { if (Thread.interrupted()

问题 Let us suppose that I have a thread that consumes items produced by another thread. Its run method is as follows, with inQueue being a BlockingQueue boolean shutdown = false; while (!shutdown) { try { WorkItem w = inQueue.take(); w.consume(); } catch (InterruptedException e) { shutdown = true; } } Furthermore, a different thread will signal that there are no more work items by interrupting this running thread. Will take() throw an interrupted exception if it does not need to block to retrieve