multithreading

问题 This is my code that works. I wouldn't have to do this if it weren't task based async, but using Monitor.Enter/Exit results in this problem Object synchronization method was called from an unsynchronized block of code. Exception on Mutex.Release() People have mentioned using AutoResetEvent, and SemaphoreSlim, but I'm not quite sure which pattern fits. private bool fakelock; internal async Task<byte[][]> ExchangeCore(byte[][] apdus) { if (apdus == null || apdus.Length == 0) return null; List

问题 C#, WPF, Helix Toolkit. I am trying to generate a bitmap from a HelixViewport3D and have encountered a few problems. The first problem is that I cannot find a way to render off-screen. There are a few references to this online (e.g. here) and as far as I can see it does not have a built-in solution. As a somewhat sub-optimal workaround I have proceeded to render to the screen where the user can see it, with the intention of creating a bitmap from that rendered image. I now have the problem

问题 I do something in a thread. But sometimes I don't want to wait till all pings are finished. How can I cancel a thread? Can you show me please the code? Private Sub Start_Button_Click(sender As Object, e As EventArgs) Handles Start_Button.Click DoSomething() End Sub Private Sub Cancel_Button_Click(sender As Object, e As EventArgs) Handles Cancel_Button.Click THRD.Cancel '<-- Thread cancel!??!??? End Sub Sub DoSomething() Dim THRD As New Thread(Sub() Dim IPArea As String = "192.168.1." Dim

问题 This is my code that works. I wouldn't have to do this if it weren't task based async, but using Monitor.Enter/Exit results in this problem Object synchronization method was called from an unsynchronized block of code. Exception on Mutex.Release() People have mentioned using AutoResetEvent, and SemaphoreSlim, but I'm not quite sure which pattern fits. private bool fakelock; internal async Task<byte[][]> ExchangeCore(byte[][] apdus) { if (apdus == null || apdus.Length == 0) return null; List

问题 I am building an ASP.NET (.NET Framework) application in C# I am making API calls to a backend service called "LinuxDocker" and I am trying to limit the number of 12 concurrent calls to it from the ASP.NET application. Here is the code I wrote: private static Semaphore LinuxDockerSemaphore = new Semaphore(12, 12); public static SemaphoreWaiter WaitForLinuxDocker(int timeoutMS = -1) { return new SemaphoreWaiter(LinuxDockerSemaphore, timeoutMS); } public class SemaphoreWaiter : IDisposable {

问题 I have been trying to improve computation times on a project by splitting the work into tasks/threads and it has not been working out very well. So I decided to make a simple test project to see if I can get it working in a very simple case and this also is not working out as I expected it to. What I have attempted to do is: do a task X times in one thread - check the time taken. do a task X / Y times in Y threads - check the time taken. So if 1 thread takes T seconds to do 100'000'000

问题 I had looked at the documentaion. And there was an example from multiprocessing import Pool def f(x): return x*x if __name__ == '__main__': with Pool(5) as p: print(p.map(f, [1, 2, 3])) The problem is: it is not working. I run this code in Jupiter Notebook cell. And this the cell doesn't raise any exception. But Jupiter's terminal does. And it says: AttributeError: Can't get attribute 'f' on <module '__main__' (built-in)> As written here the problem may be because I don't use __name__ == '_

问题 I'm using Spring boot for the application. There is a particular controller when called, makes a couple of independent requests using OkHttpClient. I am using a thread pool of 200 threads to make these calls. It works absolutely fine in the local environment. However, when deployed to cloud foundry, it shows up an error as follows. I have reduced the number of threads to 100 but the problem still remains. These are the memory settings in my CF instance - Instance Memory Limit 8192 MB Memory

问题 I am new to Spring-Boot and trying to create DefaultMessageListenerContainer so I can use the weblogic workmanager and run several message listeners in multithreaded fashion. Can someone please provide some example. So far, I found the below solution but how do I implement this in Spring-Boot? <bean class="org.springframework.jms.listener.SimpleMessageListenerContainer"> <property name="connectionFactory" ref="connectionFactory"/> <property name="destination" ref="destination"/> <property

问题 I have a Test Engine that executes multiple tests, until all tests have been executed. Each test object has an Execute and Resume method. These methods return a status: Waiting for reply from COM port Waiting for button click from User Testing completed. In the GUI, the User starts the Test Engine by clicking a button. In other words, the click event for the button calls the Test Engine's start method. Next, a test may send a message through the COM port and must suspend until a message is