sleep | 易学教程

How to sleep or delay the thread in Haskell?

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问题 This really shouldn't be so difficult to find an answer to, but alas I don't... I want to delay the next execution step in a do block. I have found the functions delay , sleep , nanosleep and usleep . And also this question, that doesn't cover how to use any of these, however: Sleep in Haskell. I am getting the same error for all of these, so probably I am doing something wrong fundamentally: Variable not in scope: delay :: Integer -> IO a0 This is my test snippet: main = do { putStrLn "line

Python sys.stdout.flush() doesn't work

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问题 The following code is supposed to print from 1 to 10 with 1 second intervals in between, however it is waiting for 10 seconds before actually printing anything and then it prints it all at once. How can I unbuffer the output? import sys import time for count in range(10) : sys.stdout.write(str(count)) sys.stdout.flush() time.sleep(1) 回答1: Found the problem import sys import time for count in range(10) : sys.stdout.write("\b%s" % count) sys.stdout.flush() time.sleep(.1) Don't know why python

sleep与yield异同

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sleep：是Thread类的一个静态方法，该方法会让当前正在执行的线程暂停执行，从而将执行机会让给其他线程执行。sleep(long mills)参数指定当前线程暂停执行的时间，经过这段阻塞时间后，该线程会进入就绪状态，等候线程调度器的调度。sleep方法声明抛出了InterruptedException异常，所以调用sleep方法时要么在方法开始处抛出异常要么使用try{}..catch{}块进行捕获。 yield方法只会给优先级相同或更高优先级的线程执行机会。yield不会将线程转入阻塞状态，只是强制当前线程进入就绪状态。因此完全有可能某个线程调用yield方法暂停后，立即又获得处理器资源被执行。yield方法没有声明抛出任何异常。 sleep比yield方法有更好的可移植性，通常，不要依靠yield控制并发线程的执行。 code： sleep public class SleepDemo extends Thread { public SleepDemo(String name) { super(name); } public void run() { for(int i=0;i<50;i++) { System.out.println(getName()+"----"+i); if(i==20) { try { Thread.sleep(1000*10); }

wait()和sleep的区别

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sleep就是正在执行的线程主动让出cpu让其他线程执行，等到sleep()指定的时间之后，cpu会回到这个线程上继续执行。如果当前线程进入了同步锁，sleep方法并不会释放同步锁，这样会导致其他被同步锁挡住的线程也无法执行。 wait()是指一个已经进入了同步锁的线程，让自己暂时让出同步锁，让其他线程打得到此同步锁继续运行，只有线程调用了notify方法，才会解除调用了wait()方法的线程。让线程去竞争同步锁继续向下执行。大概就是说：sleep()睡觉，睡到一定时间后自己就会醒了。如果它睡觉之前拿着钥匙的，它不会丢给别人，会等到睡醒了之后继续用，后面需要钥匙的人就不能进去有锁的房间。 wait() 等待。等待的时候会把钥匙丢出去，让需要这把钥匙的人拿着这个钥匙继续向下执行，但是需要有人去叫醒他,就是调用nofity() 方法，才会解除这个线程的等待，继续行下执行。来源： oschina 链接： https://my.oschina.net/u/210432/blog/112762

Alternatives to Wakelocks?

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来源： https://stackoverflow.com/questions/17940075/alternatives-to-wakelocks

Alternatives to Wakelocks?

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来源： https://stackoverflow.com/questions/17940075/alternatives-to-wakelocks

Wake Windows PC from sleep in Python 2.7

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问题 I have a script that will put the system to sleep in the middle of it. Is there any way to make that script wake the system up and then continue running? I have read many round-about ways of doing so by Wake on LAN or using Task Scheduler. I am looking for something that would wake it up after a set period of time or after a specific piece of my script is finished. I will need to this to work for Windows 7, 8.1, and 10. Anyone know of a way to wake from sleep while still running a script? 回答1

Wake Windows PC from sleep in Python 2.7

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Does time.sleep() stop all executions?

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问题 In my complex python program, when it's running, I have a piece of code that executes every 3 seconds that prints the program's progress as the percentage of the execution that's finished like so: while len(dequeueingFinishedList)!=10: print(str(len(masterListCSV_RowsListFinished)/float(len(masterListCSV_RowsList))*100) + "% done.") time.sleep(3) Is the time.sleep() function going to slow down my program? I read the that sleep function suspends execution. If it is slowing down my program, is

Does time.sleep() stop all executions?

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