multithreading

问题 I get this error on my UNIX server, when running my java server: Exception in thread "Thread-0" java.lang.OutOfMemoryError: unable to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start(Thread.java:640) at [... where ever I launch a new Thread ...] It happens everytime I have about 600 threads running. I have set up this variable on the server: $> ulimit -s 128 What looks strange to me is the result of this command, which I ran when the bug occured the

问题 I have tested the performance of slim reader/writer lock under windows 7 using the codefrom Windows Via C/C++ . The result surprised me that the exclusive lock out performance the shared one. Here are the code and the result. unsigned int __stdcall slim_reader_writer_exclusive(void *arg) { //SRWLOCK srwLock; //InitializeSRWLock(&srwLock); for (int i = 0; i < 1000000; ++i) { AcquireSRWLockExclusive(&srwLock); g_value = 0; ReleaseSRWLockExclusive(&srwLock); } _endthreadex(0); return 0; }

问题 I am trying to code a problem in Java where I have to execute a bunch of tasks. Problem Execute a job which consists of multiple tasks and those tasks have dependencies among them. A job will have a list of tasks and each such task will further have a list of successor tasks (Each successor task will have its own successor tasks - you can see the recursive nature here). Each successor task can start its execution if - It is configured to be executed on partial execution of its predecessor

问题 The following code runs into future timeouts (in Scala 2.x and Dotty, -Xcheckinit or -Ycheck-init does not help here) because of cyclic object initialization. In complex projects these cycles usually are hidden very well. Is there any possiblity of getting help from the compiler or at least at runtime? How do you prevent this from happening in a multithreaded environment? import scala.concurrent.Future import scala.concurrent._ import scala.concurrent.duration._ import scala.concurrent

问题 I am a bean for TaskScheduler and TaskExecutor as following: @Bean public TaskScheduler taskScheduler() { ThreadPoolTaskScheduler s = new ThreadPoolTaskScheduler(); s.setThreadNamePrefix("Task-Scheduler-"); s.setPoolSize(10); s.setRemoveOnCancelPolicy(true); return s; } @Bean public TaskExecutor taskExecutor() { ThreadPoolTaskExecutor e = new ThreadPoolTaskExecutor(); e.setThreadNamePrefix("Task-Executor-"); e.setMaxPoolSize(10); e.setCorePoolSize(10); return e; } Is it possible to share the

问题 OK... Looks like WinForms and Threading in the same program is something that I can't master easily. I'm trying to make a custom Numeric Up Down out of two picture boxes (used a buttons) and a text box. Yes, I can use the default NumericUpDown form, but I want to make a different looking one. I have tried to do that with timers (System.Windows.Forms.Timer). The problem is that when one timer meets "Thread.Sleep(int)", the whole program "falls to sleep". I tried with threads. Some types of

问题 I created one thread in my main program, thread execution has to stop once the main program will terminate. I am using reader.join(); to terminate the thread execution. But it is not stopping the execution. I tried with below-mentioned code, I am using thread.join(); function, but it is failed to terminate a thread. And after the main program also my thread is kept executing. #include <algorithm> #include <array> #include <atomic> #include <mutex> #include <queue> #include <cstdint> #include

问题 I created one thread in my main program, thread execution has to stop once the main program will terminate. I am using reader.join(); to terminate the thread execution. But it is not stopping the execution. I tried with below-mentioned code, I am using thread.join(); function, but it is failed to terminate a thread. And after the main program also my thread is kept executing. #include <algorithm> #include <array> #include <atomic> #include <mutex> #include <queue> #include <cstdint> #include

问题 I need a thread local variable, ideally stored in a struct which currently stores most of my program's global state. The first way I can see to do this is to use the thread_local! macro, however I would like to keep this thread local within my state struct. The second way I can see to achieve this is to have a HashMap<Thread,MyThreadLocalData> or similar between threads and the value of my thread local variable(s). I would then have a getter which uses thread::current to lookup the

问题 Here is my script. When I run it in a shell it just hangs indefinitely whereas I would expect it to terminate cleanly. import logging from logging import StreamHandler import pymsteams import queue import threading import atexit class TeamsHandler(StreamHandler): def __init__(self, channel_url): super().__init__() self.channel_url = channel_url self.queue = queue.Queue() self.thread = threading.Thread(target=self._worker) self.thread.start() atexit.register(self.queue.put, None) def _worker