wait

I can find many examples regarding wait_queue_head . It works as a signal, create a wait_queue_head , someone can sleep using it until someother kicks it up. But I can not find a good example of using wait_queue itself, supposedly very related to it. Could someone gives example, or under the hood of them? From Linux Device Drivers : The wait_queue_head_t type is a fairly simple structure, defined in <linux/wait.h> . It contains only a lock variable and a linked list of sleeping processes. The individual data items in the list are of type wait_queue_t , and the list is the generic list defined

How do I get PowerShell to wait until the Invoke-Item call has finished? I'm invoking a non-executable item, so I need to use Invoke-Item to open it. Unfortunately you can't by using the Invoke-Item Commandlet directly. This command let has a void return type and no options that allow for a wait. The best option available is to define your own function which wraps the Process API like so function Invoke-Command() { param ( [string]$program = $(throw "Please specify a program" ), [string]$argumentString = "", [switch]$waitForExit ) $psi = new-object "Diagnostics.ProcessStartInfo" $psi.FileName

I have a question about the following code. This is an example found on this page , not my code. The parent process forks 2 child processes, each of them counting to 200 then exiting. What I don't understand is why aren't the children printing their messages immediately after they are forked and they allow their father to enter waiting status? Also, how is the wait system call returning the pid of the child that finishes first? pid = wait(&status); #include <stdio.h> #include <string.h> #include <sys/types.h> #define MAX_COUNT 200 #define BUF_SIZE 100 void ChildProcess(char [], char []); /*

I have an app that needs to wait for some unknown amount of time. It must wait until several data fields are finished being populated by a server. The server's API provides me a way to request data, easy enough... The server's API also provides a way to receive my data back, one field at a time. It does not tell me when all of the fields are finished being populated. What is the most efficient way to wait until my request is finished being processed by the server? Here's some pseudocode: public class ServerRequestMethods { public void requestData(); } public interface ServerDeliveryMethods {

This is my first question, so hopefully I will give enough details. I have the following code in 4 pages on a website: $(document).ready(function() { $('#page_loading').slideDown(500); }); jQuery(window).load(function () { setTimeout(function() {$('#page_loading').slideUp(500);}, 1500); }); What I am I trying to achieve: When browsing thorough the 4 pages, have the #page_loading div slide down only if the page takes more than 2 seconds to load. If the pages takes less than 2 seconds to load (was visited before and most of the images are cached) then the loading div won't show up. At this point

1.wait () 和notify () 的涉及初衷是为了解决线程之间通讯的问题，他们都是java.lang.Object的三个方法。Java通过内建的等待机制来允许线程在等待信号的时候变为非运行状态。 2.为了调用wait()或者notify()，线程必须先获得那个对象的锁。 3.一旦线程调用了wait()方法，它就释放了所持有的监视器对象上的锁。这将允许其他线程也可以调用wait()或者notify()。 4.并发工具优先于wait()和notify()使用，如果使用wait()和notify()，务必确保是从while循环内部调用wait，以防止虚假唤醒。 来源： oschina 链接： https://my.oschina.net/u/203921/blog/135472