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Course Elementary 13053

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

CSS Online Manual

Course Elementary 81531

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

SVG Tutorial

Course Elementary 12624

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

AngularJS Chinese Reference Manual

Course Elementary 24069

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Go language tutorial manual

Course Elementary 26834

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.

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java - Write lock degradation problem in read-write lock

When the write lock is downgraded, the thread that has currently acquired the write lock is required to hold the write lock, then acquire the read lock, and then release the write lock. So why is it required to hold the write lock? ? In the above picture, it is mentioned that "then the current thread cannot sense the data update of thread T". How to understand this. If thread T obtains...

2017-06-12 09:24:17

Laravel cache lock already locked?

TLDR: How to check if a Laravel atomic lock is locked without locking it and checking the return value of the $lock->get() call? I have multiple Laravel commands executed through the scheduler. A command is not scheduled and if it is running, no other commands should be run. So I introduced atomic cache lock from Laravel like this: privatefunctioncheckSetupRunning(){$lock=Cache::store('locks')->

2024-03-27 13:28:19

java lock-free concurrency

Is the ratio of lock-free and locked in the following code better? I use jmeter to make 20 requests per second. Most of the output of the sleep operation in test() of the lock-free code is very different from 500 milliseconds, while the output of the locked code is basically 500 milliseconds with a difference of 1 or 2 milliseconds. This problem Very weird.... {...

2017-05-17 10:01:02

mysql optimization - mysql innodb and myisam lock

Will innodb insert be locked? If it's locked, what's the point? In innodb, update and delete will implicitly add exclusive locks, update table set... where id in (1,2,3,4); Is the exclusive lock added directly to these four records, or is it added sequentially according to the id? Lock, modify, co...

2017-05-24 11:34:38

Confused about the exclusive lock of PHP file lock?

flock.php <?php {code...} if (flock($fp,LOCK_EX)){ {code...} } ?>flock2.php <?php {code...} if (flock ($fp,LOCK_EX)){ {code...} } ?>Doubt: Why is the file locked with an exclusive lock in flock.php file, but not...

2017-05-16 13:15:13

MoreQ&A

To `notify_one()`: Lock or Not to Lock?

Course Introduction：Unlocking the Mystery behind Conditions: Lock or Not to Lock for notify_one()The Question:To ensure efficient thread coordination,...

2024-11-13 comment 0 388

Context-menu-Lock

Course Introduction：bylickilabs / Context-menu-Lock Disable the right-click Context Menu in your HTML code Context-menu-Lock Disable the right-click lock in your HTML code ✅HT

2024-12-07 comment 0 566

R-Lock vs Lock in Python

Course Introduction：Python's threading module offers two crucial synchronization tools: Lock and RLock, both designed to control access to shared resources in multithreaded applications. However, their functionalities differ significantly. 1. Lock (threading.Lock) Me

2025-01-24 comment 0 911

How to Acquire a Lock with a Deadline in Go?

Course Introduction：Acquiring Lock with Deadline in GoIn Go, the sync.Mutex type only provides Lock() and Unlock() methods. For scenarios where a lock acquisition...

2024-10-29 comment 0 678

How to Troubleshoot MySQL's 'Lock wait timeout exceeded' Error?

Course Introduction：How to debug Lock wait timeout exceeded on MySQL?When a query attempts to access a database and encounters a lock, it may result in the Lock wait...

2025-01-03 comment 0 997

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