wait

Program gets halted: wait() and notify()

由 ぃ、小莉子 提交于 2019-12-08 03:31:07
问题 I am trying to achieve this: Created two different threads, one prints odd numbers, one prints even numbers. Once one thread prints a number, it has to wait for the other thread and so on, that is one-after-other. To achieve this, i am using synchronized block along with wait() and notify(). I am creating a class whose's object will be used to pass to synchronized block in both the threads. Here is the code: --> This is used object which will be passed to synchronized block. package com.vipin

Is wait(1) in a non-blocking while(true)-loop more efficient than using wait() and notify()?

由 跟風遠走 提交于 2019-12-08 03:16:24
Does a while(true) Java loop together with wait(1) use more or less resources than a blocking loop with wait() and notify() ? And do the CPU cores have some special (hardware) implementations to allow wait(1) ? If yes, are there any limitations while working with such non-blocking loops? An example: while(true){ wait(1); //do the job here... } (Just a note: Without the wait(1) a core would go radical 100% in a while(true) loop...) As to the original question of why while (true); takes up more CPU than while (true) { wait(1); } , consider: a modern CPU can perform billions of instructions per

Difference between driver.manage.wait(long timeout) and Explicit wait

由 两盒软妹~` 提交于 2019-12-08 00:00:00
问题 Could anyone say the difference use of the : driver.manage().wait(long timeout) and WebDriverWait wait = new WebDriverWait(driver, WAIT_IN_SECONDS) (EXPLICIT WAIT) to understand my future reference. Please pardon me the questions is silly for new bee of my self in automation. Is it the simple form of the explicit wait? 回答1: driver.manage.wait(long timeout) driver.manage.wait(long timeout) is actually the java.lang.Object.wait() method is from the java.lang.Object Class which causes the

WebDriver Wait '.until(ExpectedConditions.elementToBeClickable' only works when i add Thread.sleep(500) to the Code?

由 对着背影说爱祢 提交于 2019-12-07 15:53:45
问题 I'm trying to click on a button which is visible on a page by using webdriver wait but webdriver is only able to click on the button once I add a Thread.sleep to the code. I have also checked the button to see whether its visible (True) before I execute my code and it in turn returns = true . //Button Visiblity check: List<WebElement> signOutList = driver.findElements(.xpath(".//*[starts-with(@id,'fulfillment-time-type-section-')]/div[2]//button")); Assert.assertTrue(signOutList.size() > 0);

How to run a fixed number of processes in a loop?

由 半世苍凉 提交于 2019-12-07 15:15:36
问题 I have a script like this: #!/bin/bash for i=1 to 200000 do create input file run ./java done I need to run a number (8 or 16) of processes (java) at the same time and I don't know how. I know that wait could help but it should be running 8 processes all the time and not wait for the first 8 to finish before starting the other 8. 回答1: bash 4.3 added a useful new flag to the wait command, -n , which causes wait to block until any single background job, not just the members of a given subset

Wait for all processes with a certain name to finish (in bash)

由 血红的双手。 提交于 2019-12-07 15:00:31
问题 I would like to wait in linux (Ubuntu 11.10) for a load of processes to finish. Each of these processes has a different pid but the same name. Is it possible to do this? EDIT: Perhaps I should specify that I don't necessarily know what the pid are, just the process name. EDIT: Thanks for the answers; Kevin's seems to do what I want. However, it doesn't work in the specific application I have, so I've posted a more detailed follow-up question here. 回答1: wait $(pgrep programName) Ought to do it

Selenium - don't wait until all elements are presented

由 天大地大妈咪最大 提交于 2019-12-07 13:29:00
问题 Selenium by default is waiting for all elements to be loaded. Is there any way for waiting for a specific element and then to proceed on? On my test, selenium is waiting with the wait() function for a page to be loaded. sometimes, some images couldn't be loaded from a remote server, while all others element on the page loaded successfully. How can I ask Selenium to ignore waiting all elements except a specific one? 回答1: Selenium works on a copy of the page's source so it try to wait until the

What if Implicit and Explicit wait, both are used in Framework [duplicate]

由 半世苍凉 提交于 2019-12-07 12:27:22
问题 This question already has answers here : Combining implicit wait and explicit wait together results in unexpected wait times (2 answers) Closed 5 years ago . I understand both waits and use of it. But one thing that I could not figure out is : If I put implicit wait for 5 seconds at top and then use explicit wait for an element. Then how selenium will behave. Tried but could not get satisfactory answer on net. 回答1: First understand the concepts of Explicit and Implicit wait Implicit Wait: An

Spurious wakeups on windows. Is it possible?

由 青春壹個敷衍的年華 提交于 2019-12-07 11:40:51
问题 I recently learned "Spurious wakeups" Any people say that this problem possible only for some types of Linux PC. I use windows. I wrote test for Spurious wakeups. I got result that it is possible. But I want to show this test for you. Maybe I made mistake somewhere. my initial variant: import java.util.Random; import java.util.concurrent.*; import java.util.concurrent.atomic.AtomicInteger; public class TestSpuriousWakeups { static final int MAX_THREADS = 600; static final Object mutex = new

perl background process

由 陌路散爱 提交于 2019-12-07 10:23:13
问题 I am trying to run a background process in perl. I create a child process, which is used to call another perl script. I want to run few lines of code parallely with this child process. And after the child process is done.I want to print a line of code. Main script #!/usr/bin/perl $|=1; print "before the child process\n"; my $pid = fork(); if (defined $pid) { system("perl testing.pl"); } print "before wait command\n"; wait(); print "after 20 secs of waiting\n"; testing.pl #!/usr/bin/perl print
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