multithreading

问题 I am trying to change a language at a UWP app so that the my x:uid objects related and my ResourceLoader based objects would change. I am using, as recommended at other Q&A : ApplicationLanguages.PrimaryLanguageOverride = newLanguage; Windows.ApplicationModel.Resources.Core.ResourceContext.GetForCurrentView().Reset(); Windows.ApplicationModel.Resources.Core.ResourceContext.GetForViewIndependentUse().Reset(); Frame.Navigate(this.GetType()); However, everything that is controlled directly by

问题 I have a C extension that is called from my multithreaded Python application. I use a static variable i somewhere in a C function, and I have a few i++ statements later on that can be run from different Python threads (that variable is only used in my C code though, I don't yield it to Python). For some reason I haven't met any race condition so far, but I wonder if it's just luck... I don't have any thread-related C code (no Py_BEGIN_ALLOW_THREADS or anything). I know that the GIL only

问题 My understanding of threads with respect to an NSManagedObjectContext is that it can only execute core data fetch requests, deletes, etc., on the thread from which it was created. Is there any way to check to see what thread an NSManagedObjectContext was created on, or if at a particular point of execution the current thread is that of a particular NSManagedObjectContext ? Thanks! 回答1: My understanding of threads with respect to an NSManagedObjectContext is that it can only execute core data

问题 Would it be possible to implement a custom Thread class in Java (using JNI) in a safe / correct way? Suppose I write my own NewThread class, with a native start() method, which forks the execution, calls run() in the forked thread and returns... Is that possible? Would the JVM complain? Is it "legal" according to the specs? Would this break anything, like, in the memory-model? Does it depend on the particular JVM? 回答1: Your questions is answered in the Java Native Interface Programmer's Guide

问题 I use ThreadPool.QueueUserWorkItem for creating a thread on Windows CE (I use .NET Framework 3.5). Sometimes the thread waits for something and starts too late. In the QueueUserWorkItem documentation it says that the delegate will be executed "when a thread pool thread becomes available". Is there a way to force the ThreadPool to execute my delegate immediately? Would Thread.Start() be a solution for this? Thank you! 回答1: First off, QueueUserWorkItem doesn't create a thread, it merely places

问题 We are currently using for compression the GZipOutputStream class of ICsharpCode.SharpZipLib library. We do it from a single thread. I want to split my input data stream into chunks and compress them in parallel. I'm worried though that this library may have some statics inside which will be overwritten from multiple threads and therefore corrupt the resulting stream. Any thoughts will be appreciated. 回答1: It is standard practice to make sure all static members are thread-safe when coding

问题 I searched online but in vain. info thread provides all the threads the are currently alive in the process attached with gdb. I want to know if it is possible for gdb to show a thread tree i.e. parent child relationship between the listed threads. Why do I want to know that?: Amongst a dozen threads, one of the thread is waiting on join_all() of its child threads. If I can understand on which threads is the main thread waiting on, I can debug better. Metadata: gdb version 7.7 回答1: I don't

问题 I searched online but in vain. info thread provides all the threads the are currently alive in the process attached with gdb. I want to know if it is possible for gdb to show a thread tree i.e. parent child relationship between the listed threads. Why do I want to know that?: Amongst a dozen threads, one of the thread is waiting on join_all() of its child threads. If I can understand on which threads is the main thread waiting on, I can debug better. Metadata: gdb version 7.7 回答1: I don't

问题 My first question on SO, but I've lurked for a long time now so you'll have to forgive me if I've broken any rules or posted a rubbish question. I'm trying to get a better understanding of threading and I decided to test MRI and see how it performs in general. Given the following code (and output), why are the threaded operations so much slower than the non-threaded variant? code class Benchmarker def self.go puts '----------Benchmark Start----------' start_t = Time.now yield end_t = Time.now

问题 I'm writing a little crawler that should fetch a URL multiple times, I want all of the threads to run at the same time (simultaneously). I've written a little piece of code that should do that. import thread from urllib2 import Request, urlopen, URLError, HTTPError def getPAGE(FetchAddress): attempts = 0 while attempts < 2: req = Request(FetchAddress, None) try: response = urlopen(req, timeout = 8) #fetching the url print "fetched url %s" % FetchAddress except HTTPError, e: print 'The server