multithreading

问题 I am trying to get 1 millisecond delay but i am getting 15 times higher.I have also tried with windows Sleep(1) function which was also giving me the same result. why am i not getting exact millisecond delay? Where as it works with 1 second delay. #include <iostream> #include <Windows.h> #include <thread> #include <chrono> void counter1(); auto main() -> int { std::thread p(&counter1); p.join(); return 0; } void counter1() { int nStep = 0; const int STEP = 1000; auto start = std::chrono::high

问题 Hi When i use following code: myManualResetEvent.Dispose(); Compiler gives this error: 'System.Threading.WaitHandle.Dispose(bool)' is inaccessible due to its protection level. howevr following line works fine: ((IDisposable)myManualResetEvent).Dispose(); is it the correct way to dispose or at runtime it might crash in some scenerios. Thanks. 回答1: The designers of the .NET Base Class Library decided to implement the Dispose method using explicit interface implementation: private void

问题 I have three methods on my project annotated with @Scheduled, being one of them a cron expression and the other two are fixed delay. The annotations look like: Method 1: @Scheduled(fixedDelay = 20000) @Async protected void checkBrokenEngines() { Method 2: @Scheduled(fixedRate = 20000) @Async public void checkAvailableTasks() throws Exception { Method 3: @Scheduled(cron = "0 0 2 * * ?") protected void deleteOldData() { Previously I had a problem that when the checkBrokenEngines and

问题 I have three methods on my project annotated with @Scheduled, being one of them a cron expression and the other two are fixed delay. The annotations look like: Method 1: @Scheduled(fixedDelay = 20000) @Async protected void checkBrokenEngines() { Method 2: @Scheduled(fixedRate = 20000) @Async public void checkAvailableTasks() throws Exception { Method 3: @Scheduled(cron = "0 0 2 * * ?") protected void deleteOldData() { Previously I had a problem that when the checkBrokenEngines and

问题 This thread I have written has three try catches. The first is a try with resources to set up an ObjectOutputStream. The second recieves information from another on whether authentication has succeeded or failed. On success it should establish a map utilised in communication and on failure the thread is returned from. Likewise if an Interrupt or IOException occurs in this phase, the thread is returned from. Only in the eventuality of successful authentication as far as I can see should the

问题 I have read somewhere that every threads have its own copy of shared states, even if I'm using synchronized or locks for modifying the variables, what guarantees that the changed state will be flushed into the main memory rather than in thread's own cache memory. I know volatile guarantees and justifies the above scenario, even I know synchronized justifies too. How does synchronized guarantees that changing the value is happening in the main memory rather than thread cache memory. Ex Thread

问题 I am running function that takes time to finish. The user has a choice to stop this function/event. Is there an easy way to stop the thread or loop? class ThreadsGenerator: MAX_WORKERS = 5 def __init__(self): self._executor = ThreadPoolExecutor(max_workers=self.MAX_WORKERS) self.loop = None self.future = None def execute_function(self, function_to_execute, *args): self.loop = asyncio.get_event_loop() self.future = self.loop.run_in_executor(self._executor, function_to_execute, *args) return

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 . Improve this question I have a list of running tasks with the same CancellationTokenSource . I want the current thread to wait until all the tasks complete or until the tasks were cancelled. Task.WaitAll(tasks.ToArray(), searchCencellationTokenSource.Token); System.Console

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 . Improve this question I have a list of running tasks with the same CancellationTokenSource . I want the current thread to wait until all the tasks complete or until the tasks were cancelled. Task.WaitAll(tasks.ToArray(), searchCencellationTokenSource.Token); System.Console

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 . Improve this question I have a list of running tasks with the same CancellationTokenSource . I want the current thread to wait until all the tasks complete or until the tasks were cancelled. Task.WaitAll(tasks.ToArray(), searchCencellationTokenSource.Token); System.Console