multithreading

问题 My python script need to change one object lcd_p1 every time the function wait_thread_v1 is call every second by a thread t1, but how do this? I don't know how to access this object inside the function? Anyone can help? vazao1 = 12 global pulses_v1 pulses_v1 = 0 GPIO.setmode(GPIO.BCM) GPIO.setup(vazao1, GPIO.IN) class Window(QWidget): def __init__(self): super().__init__() self.setGeometry(50, 50, 640, 480) self.setWindowTitle("Programa") self.initUI() def initUI(self): self.lcd_v1 =

问题 My python script need to change one object lcd_p1 every time the function wait_thread_v1 is call every second by a thread t1, but how do this? I don't know how to access this object inside the function? Anyone can help? vazao1 = 12 global pulses_v1 pulses_v1 = 0 GPIO.setmode(GPIO.BCM) GPIO.setup(vazao1, GPIO.IN) class Window(QWidget): def __init__(self): super().__init__() self.setGeometry(50, 50, 640, 480) self.setWindowTitle("Programa") self.initUI() def initUI(self): self.lcd_v1 =

问题 My python script need to change one object lcd_p1 every time the function wait_thread_v1 is call every second by a thread t1, but how do this? I don't know how to access this object inside the function? Anyone can help? vazao1 = 12 global pulses_v1 pulses_v1 = 0 GPIO.setmode(GPIO.BCM) GPIO.setup(vazao1, GPIO.IN) class Window(QWidget): def __init__(self): super().__init__() self.setGeometry(50, 50, 640, 480) self.setWindowTitle("Programa") self.initUI() def initUI(self): self.lcd_v1 =

问题 There are two functions in epoll: epoll_ctl epoll_wait Are they thread-safe when I use the same epoll_fd? What will happen if one thread calls epoll_wait and others call epoll_ctl at the same time? 回答1: It is thread-safe, but there isn't much documentation that explicitly states that - see http://linux.derkeiler.com/Mailing-Lists/Kernel/2006-03/msg00084.html BTW, you can also have multiple threads waiting on a single epoll_fd, but in that case it can get a bit tricky (i.e. you might want to

问题 There are two functions in epoll: epoll_ctl epoll_wait Are they thread-safe when I use the same epoll_fd? What will happen if one thread calls epoll_wait and others call epoll_ctl at the same time? 回答1: It is thread-safe, but there isn't much documentation that explicitly states that - see http://linux.derkeiler.com/Mailing-Lists/Kernel/2006-03/msg00084.html BTW, you can also have multiple threads waiting on a single epoll_fd, but in that case it can get a bit tricky (i.e. you might want to

问题 I want to use multiprocessing.Pool, but multiprocessing.Pool can't abort a task after a timeout. I found solution and some modify it. from multiprocessing import util, Pool, TimeoutError from multiprocessing.dummy import Pool as ThreadPool import threading import sys from functools import partial import time def worker(y): print("worker sleep {} sec, thread: {}".format(y, threading.current_thread())) start = time.time() while True: if time.time() - start >= y: break time.sleep(0.5) # show

问题 This question already has answers here : Events and multithreading once again (2 answers) C# Events and Thread Safety (15 answers) Is C#'s null-conditional delegate invocation thread safe? (3 answers) Is C# 6 ?. (Elvis op) thread safe? If so, how? (2 answers) c# ?. conditional operator (3 answers) Closed 13 days ago . The documentation says that PropertyChanged?.Invoke(…) is thread safe, because it is equivalent to this: var handler = this.PropertyChanged; if (handler != null) { handler(…); }

问题 Let me describe what I am trying to achieve. I am programming in C#. I have a function (method) DoCalculations(). I want to call this DoCalculations() method recursively. However, in C# I get exception as unhandled exception System.StackOverflow. So, I am trying to run DoCalculations() method on a back ground thread. On FORM LOAD event. I have done following:- Thread objThread = new Thread(new ThreadStart(DoCalculations)); On START BUTTON CLICK event. I am starting the Thread as follows.

问题 Let me describe what I am trying to achieve. I am programming in C#. I have a function (method) DoCalculations(). I want to call this DoCalculations() method recursively. However, in C# I get exception as unhandled exception System.StackOverflow. So, I am trying to run DoCalculations() method on a back ground thread. On FORM LOAD event. I have done following:- Thread objThread = new Thread(new ThreadStart(DoCalculations)); On START BUTTON CLICK event. I am starting the Thread as follows.

问题 How to know that EDT is blocked (not visually but by inspecting the thread itself)? is there a way? I'm on the way to my final university task for graduation that have bunch of charts , but have little knowledge of Swing EDT (Java generally). have look at this piece: SwingUtilities.invokeLater(new Runnable() { public void run() { // task here } }); If we do some tasks that modify gui component on the block (including calling another Thread) , is that already the correct approach? And since