In software engineering, double-checked locking (also known as "double-checked locking optimization") is a software design pattern used to reduce the overhead of acquiring a lock by testing the locking criterion (the "lock hint") before acquiring the lock. Locking occurs only if the locking criterion check indicates that locking is required. The pattern, when implemented in some language/hardware combinations, can be unsafe. At times, it can be considered an anti-pattern. It is typically used to reduce locking overhead when implementing "lazy initialization" in a multi-threaded environment, especially as part of the Singleton pattern. Lazy initialization avoids initializing a value until the first time it is accessed. (Wikipedia).
Combination Locks - Intro to Algorithms
This video is part of an online course, Intro to Algorithms. Check out the course here: https://www.udacity.com/course/cs215.
From playlist Introduction to Algorithms
Counting: Find the Number of Lock Combinations
This video explains how to determine the number of lock combinations are possible.
From playlist Counting (Discrete Math)
Samsung Galaxy S5 customization - set up lock screen
In this video we teach you how to set up the Samsung Galaxy S5 lock screen to provide some security for your phone.
From playlist Technology
Make A Combination Lock - Intro to Algorithms
This video is part of an online course, Intro to Algorithms. Check out the course here: https://www.udacity.com/course/cs215.
From playlist Introduction to Algorithms
Latches and Flip-Flops 2 - The Gated SR Latch
This is the second in a series of computer science videos about latches and flip-flops. These bi-stable combinations of logic gates form the basis of computer memory, counters, shift registers, and more. In particular, this video covers the gated set-reset latch. It begins by reviewing
From playlist Latches and Flip-Flops
This LOCK is NOT What it Seems!! - Solving the CHALLENGING Lock Puzzle!
B Lock Puzzle: http://bit.ly/2Fx8urh Today I'm attempting to solve the infamous B Lock puzzle by Boaz Feldman. This lock puzzle is very difficult and can be used as an actual lock! The secret to opening is contained within the lock and key. Enjoy! OTHER LOCK PUZZLE VIDEO: https://www.you
From playlist Puzzles!
Excel Magic Trick 1467: COUNTIFS or SUMPRODUCT for Complex Counting Formula? (3 Examples)
Excel Magic Trick 1467: Count Open Projects by Day and Project Code, Including Empty Cells Download Files: https://people.highline.edu/mgirvin/YouTubeExcelIsFun/EMT1466-1467.xlsx Entire page with all Excel Files for All Videos: http://people.highline.edu/mgirvin/excelisfun.htm Learn about
From playlist Excel COUNTIF Function Formula Tricks
Excel Magic Trick 1444: Logical Formulas: Count & Extract Customer Names for 8 Sales Coupon Groups
Download File: https://excelisfun.net/files/EMT1444-1445.xlsx See how to use Excel Formulas to analyze a group of customers who have been given coupons to three stores. Our goal is to count how many customers used coupons in one of eight coupon groups (all combinations of the three store c
From playlist Excel Data Analysis Tricks
Excel Magic Trick 1400 Part 2: Conditionally Format Row with Complex Criteria (3 More Examples)
Download Files: https://excelisfun.net/files/EMT1400%20Part%202.xlsx https://excelisfun.net/files/EMT1400%20Part%202-Timing.xlsm See 3 formula solutions for how to Conditionally Format the row in an Enrollment Table when the following conditions are met: 1) Enrollment less than 15, 2) t
From playlist Excel Conditional Formatting Tricks
Imagine a combination lock with three wheels. The wheels are labelled with the numbers 1, 2, 3. Turn the wheels and numbers increase, until 3 turns back to 1. You may only turn the first two wheels together or the last two wheels together. Starting from the combination 333 what series of m
From playlist My Maths Videos
Slaying Excel Dragons Book #27 IF function (12 Examples), AND OR functions, Nesting IFs
Download files: https://people.highline.edu/mgirvin/ExcelIsFun.htm Learn Excel from beginning to end. Complete Lessons about Excel. This video series accompanies the published book, Slaying Excel Dragons, ISBN 9781615470006 Chapter 5: IF Function Pages 248 - 268 Topics: 1. IF Function 2. L
From playlist Slaying Excel Dragon Videos: Comprehensive Excel 2010 Lessons. (53 Videos)
Bitcoin Q&A: Locking Scripts and Transaction Verification
Explain the locking and unlocking scripts in transactions. How are transaction signatures verified by nodes and miners? What happens to unconfirmed transactions from orphaned blocks? Do non-mining nodes get a reward? These questions are from the third and fourth sessions of MOOC 12, which
From playlist Bitcoin Q&A
Spring toggle mechanism enables to reach end positions of a lever quickly and holds it there firmly. The pink double crank represents action from outside.
From playlist Mechanisms
Excel Magic Trick 1134: IF or VLOOKUP function for Assigning Categories w/ Excel Formula 8 Examples
Download Excel Start File: https://people.highline.edu/mgirvin/YouTubeExcelIsFun/EMT1134.xlsb Download Excel File: http://people.highline.edu/mgirvin/ExcelIsFun.htm See how to assign product and sales categories using various methods: Overview 1) (00:44 min) Overview (01:30 min) IF and Ha
From playlist Excel Series: Magic Tricks (6th 200 videos)
Excel Magic Trick 1063: Pull Student Grades From Many Sheets onto Summary Table Excel Grade Book
Download Excel Start File: https://people.highline.edu/mgirvin/YouTubeExcelIsFun/EMT1063Start.xlsx https://people.highline.edu/mgirvin/YouTubeExcelIsFun/EMT1063Answer.xlsx Download Excel File: http://people.highline.edu/mgirvin/ExcelIsFun.htm See this multiple step project to create this
From playlist Excel Series: Magic Tricks (6th 200 videos)
Excel Magic Trick 862: Count Numbers In Column, But Only If Number Is Not Repeated In Row
Download Excel Start File: https://people.highline.edu/mgirvin/YouTubeExcelIsFun/EMT862.xlsx Download from: http://people.highline.edu/mgirvin/ExcelIsFun.htm Create: 1. Helper column using AND function and the "not comparative operator" to check to see if numbers in row are all not the
From playlist Excel Series: Magic Tricks (5th 200 videos)
Excel for Accountants: Formulas, Functions & Formatting to Build Account Templates (37 Examples)
Download File: Start File: https://people.highline.edu/mgirvin/YouTubeExcelIsFun/WAATP2017TacomaAccountingExcelConferenceStart.xlsx Finished File: https://people.highline.edu/mgirvin/YouTubeExcelIsFun/WAATP2017TacomaAccountingExcelConferenceFinished.xlsx Entire page with all Excel Files fo
From playlist Excel Accounting Playlist Of Videos
Excel Basics 13: IF Function Made Easy! IS Functions Too! 14 Epic Examples!!
Highline College Busn 216 Class: Computer Applications taught by Michael Girvin. Download Excel Start & Finished File: https://people.highline.edu/mgirvin/AllClasses/216v2016/Content/04Excel/EB13-IF-FunctionAnd-IS-Functions.xlsm Download Full Written Notes: https://people.highline.edu/mgir
From playlist Excel Formulas - Basics and Beyond
How to Lock and Protect Individual Cells in Excel + Bonus Tips for Quick Setup
Sign up for our Excel webinar, times added weekly: https://www.excelcampus.com/blueprint-registration/ In this video I explain how to lock & protect individual cells or ranges for editing. This is useful when you only want users to be able to edit specific cells and protect other cells t
From playlist Excel Formulas