sleep

The windows form I am working on subscribes to Microsoft.Win32.SystemEvents.PowerModeChanged and on Suspend it runs the Close() method on the form. On Resume it runs the Run() function like it would on initial load. The problem is that when the computer is woken from sleep mode the PowerModeChanged event is triggered on a worker thread named ".Net SystemEvents" and when Run() is called it recreates the form on this worker thread instead of the main thread. This form is a project I inherited from another developer and I am new to windows form programming. I am wondering if there is a better way

1.join(long)方法的源码 首先看join()源码： public final void join() throws InterruptedException { join(0); } 从源码中可以看出，join()直接调用了join(long)方法，join(long)源码如下： public final synchronized void join(long millis) throws InterruptedException { long base = System.currentTimeMillis(); long now = 0; if (millis < 0) { throw new IllegalArgumentException("timeout value is negative"); } if (millis == 0) { while (isAlive()) { wait(0); } } else { while (isAlive()) { long delay = millis - now; if (delay <= 0) { break; } wait(delay); now = System.currentTimeMillis() - base; } } } 通过阅读源码可以看出，是通过不断轮询的方式去观察线程是否还是活动线程 join(0

I have the following use case: My current thread needs to do operation1 , waits some amount of time to coordinate with others and afterwards needs to do operation2 . In between the waiting, APCs might need to be processed by that thread because of file system events, which add another operation1 to some queue to be processed later after operation2 is finished by the current thread. Something simple like the following: while (true) { processOperation1; SleepEx(..., true); processOperation2; } The important thing is that between operation1 and operation2 at least the specified amount of time to

I have a python script that is running in the background with pythonw. If I close my laptop, it goes into sleep mode. and when I open my laptop, my program has little functionality and freezes after a couple of seconds. Is there any way that my script can tell if my computer is going into sleep mode, so that it can lie dormant and restart when I re-open my laptop? You can catch WM_POWERBROADCAST window message with PBT_APMQUERYSUSPEND event inside it. To catch this message inside Python program, you can create new invisible window and make separate thread repeatedly calling GetMessage() . In

I was checking out clock() on cplusplus.com . Their example involves making the process wait for a second and then output a line, in a loop until 10 seconds have ellapsed. I need to do something similar in the homework assignment I'm working on. What I was wondering was this: if I just send my program into a loop, isn't that using system resources to just spin me around? In this case, wouldn't a system call be better? Thanks for your help! Yes, using a system call or library function like sleep() is much better. That clock() example is just meant to just show how to correctly call the function

A third-party library provides a function I need to call every 100ms. Setting up a timer to do that works very well as long as my app is on foreground. When my app is on background timer works for a while but after a about a minute timer is called only after 10 second delay. The same happened when I created a separate thread with usleep-function. Is there any way I can keep timer running while my app is on background? Use beginActivityWithOptions:reason: to disable app nap for your application. You should try and re-architect to avoid these sorts of frequent timers, especially when your