thread-safety

问题 I recently wrote up a simple Twitter app for Android to learn the ropes of the Twitter API and OAuth. The app's main activity simply asks for a username to follow. It then calls another activity which handles the OAuth & Twitter API calls. It redirects the user to an authorization page, which then returns to the app after the user finishes. It used to work just fine, but now for some reason when I call webview.loadUrl(authorizationURL), NOTHING happens. I never changed anything that would

问题 I have a task that would benefit from the Thread Pool design pattern (many small tasks to be performed in parallel). I initially implemented a naive thread pool from scratch, with n Runnables all pulling work units from the same ConcurrentLinkedQueue until the queue is empty, then terminating. I then decided "hey, let's try the Executor in Java, because that is probably better-tested and more reliable than my naively designed system." Problem: in my implementation, each thread persisted until

问题 even after creating new object of unmarshaller every time, threads are getting blocked Please help "http-80-3" daemon prio=10 tid=0x000000004fabe800 nid=0x7147 waiting for monitor entry [0x0000000042401000] java.lang.Thread.State: BLOCKED (on object monitor) at java.util.zip.ZipFile$ZipFileInputStream.read(ZipFile.java:457) - waiting to lock <0x00000000c02cce20> (a sun.net.www.protocol.jar.URLJarFile) at java.util.zip.ZipFile$ZipFileInputStream.read(ZipFile.java:475) at java.io

问题 I know how to atomically write a value in x86 ASM. But how do I read one? The LOCK prefix can't be used with mov. To increase a value, I am doing: lock inc dword ptr Counter How do I read Counter in a thread-safe way? 回答1: I'm not an assembly expert, but word-sized (on x86, 32-bit) reads/writes should be atomic already. The reason you need to lock the increment is because that's both a read AND a write. 回答2: As I explain to you in this post: Accesses to cacheable memory that are split across

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: BackgroundWorker vs background Thread When should I consider managing threads on my own as opposed to using the BackgroundWorker? I know managing threads on your own can be difficult and can lead to problems, is there a direct benefit of managing them on your own? 回答1: You will find an answer to this question at: BackgroundWorker vs background Thread 来源： https://stackoverflow.com/questions/5195733/when-to-use

问题 Here is a nice article describing thread safety of random numbers:Getting random numbers in a thread-safe way But I'm stuck with the "RandomGen2" example: public static class RandomGen2 { private static Random _global = new Random(); [ThreadStatic] private static Random _local; public static int Next() { Random inst = _local; if (inst == null) { int seed; lock (_global) seed = _global.Next(); _local = inst = new Random(seed); } return inst.Next(); } } Why is the thread static field copied to

问题 I have a multi-threaded application which parses some text and it needs to use English Culture Info for parsing numbers from this text. So, i do not want to create EngCulture everytime i call the parsing function. Currently i am passing EngCulture as a parameter but i am not happy with this. I want to define the EngCulture as a static member so it will be shared by threads. Msdn documentation says that "Any public static (Shared in Visual Basic) members of this type are thread safe. Any

问题 While trying to solve a previously asked SO question of mine, I've find that even without my threads, the problem occurs. what I have now , is a really simple single-threaded code , that calls - NetServerEnum() . when returned, it calls NetApiBufferFree() and return from main, which supposed to end the process. at that point, my thread truly ends, but the process won't exit , as there are 4 threads opened (not by me): 1 * ntdll.dll!TplsTimerSet+0x7c0 (stack is at ntdll.dll

问题 I have a situation in my project where i have connect to multiple server and listen for events. Whenever a event received from the server, Handler should add the event to the common queue for processing. All connections should add received events to the queue. foreach(var item in collection) { Connection c = new connection(item); c.start(); c.EventReceived+=new EventHandler(myHandler); list.add(c); } protected void myHandler(eventArgs) { //add it to the concurrent queue } Here i doubt that

问题 New to python and trying to understand multi-threading. Here's an example from python documentation on Queue For the heck of my life, I don't understand how this example is working. In the worker() function, there's an infinite loop. How does the worker know when to get out of the loop? There seems to be no breaking condition. And what exactly is the join doing at the end? Shouldn't I be joining the threads instead? def worker(): while True: item = q.get() do_work(item) q.task_done() q =