sleep | 易学教程

Network access when the Android phone is asleep

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问题 I'm using a combination of alarm (set with AlarmManager ) and background service to periodically synchronize data in my application. The only problem I have is that when sleep policy terminates Wi-Fi connection the synchronization no longer works. Is there a way to "wake up" the Wi-Fi connection that has been put to sleep? GMail somehow manages to do that because it notifies me about new e-mail even if the phone entered sleep mode. 回答1: [update]You can use a WifiLock to keep WiFi active,

When does Thread.sleep(1000) sleeps less than 1000 milliseconds?

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问题 In this interesting article about falsehoods programmers believe about time, one of them is Thread.sleep(1000) sleeps for >= 1000 milliseconds. When isn't this true? 回答1: According to this (Implementation of the sleep by windows operating system, which is what Thread.sleep will call underneath): If dwMilliseconds is less than the resolution of the system clock, the thread may sleep for less than the specified length of time. If dwMilliseconds is greater than one tick but less than two, the

What else can i do 'sleep' when the sleep() can't work well with alarm?

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问题 There are many documents say "you should avoid using sleep with alarm, since many systems use alarm for the sleep implementation". And actually, I'm suffering with this problem. So does anyone can help me that what else i can do 'sleep' when the sleep() can't work well with alarm? I have already tried 'usleep' of the Time::HiRes module, and select() function. But they didn't work either. 回答1: You can try AnyEvent: use AnyEvent; my $cv = AnyEvent->condvar; my $wait_one_and_a_half_seconds =

PHP sleep() not working

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问题 I'm making a php file that will run an event after five minutes have elapsed. From the docs, it seems like waiting five minutes would only require sleep(300) , but this isn't working. I've tested all the other code, and it works fine until I add the sleep line. <?php /** * Twitter App * bagelBack.php * Takes parameters from $_POST and creates a tweet * RKoutnik, 2012 * Code originally found on http://140dev.com/twitter-api-programming-tutorials/hello-twitter-oauth-php/ */ $name = '@'.$_POST[

Java Thread Sleep and Interrupted Exception

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问题 Why does a sleep thread need a try catch to catch Interrupted Exception? Why does a sleep even emit an Interrupted Exception error? This are the two questions I really wanna find out about in java programming I've been searching through google and i've still haven't found a clear explanation is to why this two things happen. 回答1: 1.- Because a Thread cant complete its normal execution if you Interrupt it, and you need to catch that in order to be prepared to do something. 2.- Because a thread

Does calling sleep() from pthread put thread to sleep or process?

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问题 I saw that there is a question about pthread sleep linux However, when I looked up man page on my linux machine, I see the following. SYNOPSIS #include unsigned int sleep(unsigned int seconds); DESCRIPTION sleep() makes the current process sleep until seconds seconds have elapsed or a signal arrives which is not ignored. So my question is that I would like to know which man page I should follow to put the thread sleep. In addition, if both are true, how can I control that? I can probably

Off screen rendering when laptop shuts screen down?

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问题 I have a lengthy number-crunching process which takes advantage of quite abit of OpenGL off-screen rendering. It all works well but when I leave it to work on its own while I go make a sandwich I would usually find that it crashed while I was away. I was able to determine that the crash occurs very close to the moment The laptop I'm using decides to turn off the screen to conserve energy. The crash itself is well inside the NVIDIA dlls so there is no hope to know what's going on. The obvious

How to make a non-blocking sleep in javascript/jquery?

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问题 How to make a non-blocking sleep in javascript/jquery? 回答1: At the risk of stealing the answer from your commentors, use setTimeout(). For example: var aWhile = 5000; // 5 seconds var doSomethingAfterAWhile = function() { // do something } setTimeout( doSomethingAfterAWhile, aWhile ); 来源： https://stackoverflow.com/questions/7729382/how-to-make-a-non-blocking-sleep-in-javascript-jquery

code for wait_event_interruptible

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Where can I find the code for wait_event_interruptible in Kernel tree. What I can find is wait_event_interruptible is defined as __wait_event_interruptible in . But I am unable to find the code . Please help me out. Consider a process which has gone to sleep by wait_event_interruptible. Suppose if there is an interrupt now and the interrupt handler wakes(wake_up_event_interruptible) up the sleeping process. For the process to wake up successfully should the condition given in wait_event_interruptible be true ? Thanks It's in include/linux/wait.h : #define wait_event_interruptible(wq, condition

what is the iOS sleep function

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问题 I am looking for a function that puts a thread to sleep on iOS for c++ code, or even objective-c code, sleep(0) is not recognized by my compiler Thanks, 回答1: Block for .5 seconds: [NSThread sleepForTimeInterval:.5]; 来源： https://stackoverflow.com/questions/15004712/what-is-the-ios-sleep-function