synchronization

问题 I need to be able to check if the local OneDrive folder is in sync/up to date. Can I check this by looking at any of the file/folder properties(in C# code) Without using any of One Drive APIs? 回答1: I was stuck with that and tought to check the main folder Icon. EDITED The point is to extract the synced folder icon and get the overlay CLSID. You first need a class to extract the info you need : using System; using System.Collections.Generic; using System.Drawing; using System.IO; using System

问题 What's the difference between InterlockedCompareExchangeRelease() and InterlockedCompareExchangeAcquire() ? When I try to learn the synchronization functions with WIN32 API, I find there are two functions named differently but seems to do the same thing: LONG __cdecl InterlockedCompareExchangeRelease( __inout LONG volatile *Destination, __in LONG Exchange, __in LONG Comparand ); and LONG __cdecl InterlockedCompareExchangeAcquire( __inout LONG volatile *Destination, __in LONG Exchange, __in

问题 Is there a way to tell, for a Java object, which Thread (or null) currently owns its monitor? Or at least a way to tell if the current thread owns it? 回答1: I've found out some answers myself. To test if the current thread holds the monitor, Thread.holdsLock exists! if (!Thread.holdsLock(data)) { throw new RuntimeException(); // complain } This is really fast (sub-microsecond) and has been available since 1.4. To test in general, which thread (or thread ID) holds the lock, it's possible to do

问题 I am running test but I want to run 2 functions at the same time. I have a camera and I am telling it to move via suds, I am then logging into the camera via SSH to check the speed the camera is set to. When I check the speed the camera has stopped so no speed is available. Is there a way I can get these functions to run at the same time to test the speed of the camera. Sample code is below: class VerifyPan(TestAbsoluteMove): def runTest(self): self.dest.PanTilt._x=350 # Runs soap move

问题 This question already has answers here : Is it possible to have multiple core data “databases” on one iOS app? (2 answers) Closed 6 years ago . I am working on an ipad app where I am dealing with core data. The data managed by the app can be categorised into two categories. The first kind of data is specific to that device only or app only. whereas the other category of data needs synching among various device having the same app. so in the scenario, I got a thought to have two model file in

问题 As a C++ programmer becoming more familiar with Java, it's a little odd to me to see language level support for locking on arbitrary objects without any kind of declaration that the object supports such locking. Creating mutexes for every object seems like a heavy cost to be automatically opted into. Besides memory usage, mutexes are an OS limited resource on some platforms. You could spin lock if mutexes aren't available but the performance characteristics of that are significantly different

问题 Here is the scenario. 2 web servers in two separate locations having two mysql databases with identical tables. The data within the tables is also expected to be identical in real time. Here is the problem. if a user in either location simultaneously enters a new record into identical tables, as illustrated in the two first tables below, where the third record in each table has been entered simultaneously by the different people. The data in the tables is no longer identical. Which is the

问题 It seems that the company that I work for is always struggling with our customers’ server environments . Specifically, we almost always encounter problems with testing servers and production servers, and the fact that they always seem to be configured differently. When we test the applications that we develop, the testing servers behave in one way, and thus we tweak and configure our applications to fit that particular behavior. But when we install the same application on the production

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . The more I read the more confused I become... I would have thought it trivial to find a formally correct mpsc queue implemented in c++. Every time I find another stab at it, further research seems to suggest there are issues such as ABA or other subtle race conditions. Many talk

问题 I have developed a generic producer-consumer queue which pulses by Monitor in the following way: the enqueue : public void EnqueueTask(T task) { _workerQueue.Enqueue(task); Monitor.Pulse(_locker); } the dequeue: private T Dequeue() { T dequeueItem; if (_workerQueue.Count > 0) { _workerQueue.TryDequeue(out dequeueItem); if(dequeueItem!=null) return dequeueItem; } while (_workerQueue.Count == 0) { Monitor.Wait(_locker); } _workerQueue.TryDequeue(out dequeueItem); return dequeueItem; } the wait