Programmer Think

background We are uploading files today. After uploading files, we need to compare whether the hash values of uploaded files and local files are consistent. For the upload client, the hash value of the file can be calculated separately in advance, and then compared with the hash value returned by the server after successful upload. But obvious ...

Dead Lock refers to two or more computing units (processes, threads or coroutines) that are waiting for the other party to stop execution to obtain system resources, but none of them exits in advance. The deadlock example code is as follows: public class DeadLockExample { public static void main(String[] args) { Object lockA = ne ...

"Let's go Golang" let Xie Cheng kill himself In this blog post, we discuss Go's cooperation process and kill his own cooperation process. Here we need to use runtime Goexit(). Let's start with the runtime Goexit() and its usage package main import ( "fmt" "runtime" "time" ) func task051() { defer fmt.Println("Here you go") ...

​ Go set type In this article, we learned slice and how to use it. Next, we introduce the principle of slice and learn the underlying design. Array array Before talking about slice, let's introduce arrays. Arrays exist in almost all programming languages, and Go is no exception. So why does Go language design slice in addition to array? Let's ...

Author: Regan YueSource: Hang Seng LIGHT cloud communityUltra fine! A case of Zookeeper electionToday, let's take you to the case of realizing election with Zookeeper to help you better learn Zookeeper.6, Determine whether to connect Zookeeperfunc (electionManager *ElectionManager) isConnected() bool { if electionManager.ZKClientConn == nil ...

Golang type assertion and type conversion 1. Type assertion Type assertions are used to check whether the value held by the interface type variable implements the desired interface or specific type. The syntax of type assertions is as follows: PrimaryExpression.(Type) PrimaryExpression must be a variable of interface type, which can be ...

Mutex (mutex) details: mutex is a value type that implements the locker interface, so you need to pay attention to parameter transmission when using it. Its bottom layer is nested with linux semaphores. Each operation is actually a PV operation type Mutex struct { state int32 sema uint32 } Semaphore interpretation By operating se ...

Goroutine 1, Concurrent Concurrent programming shows that the program is composed of several independent active units. In today's Internet, a web server may process thousands of requests at a time. While tablet computers and mobile phones render the user interface, the back end also synchronously calculates and processes network requests.In g ...

Write in front go build, go run, go install, go get are the most frequently used commands by go language developers in their daily work or study, These commands can help us compile programs, run programs, install programs and obtain code packages. However, when executing these commands, have you thought about how to organize our source files i ...

Typical Go file layoutpackage clauseAny import statementActual code// Each Go file starts with a package clause, which means that all the remaining code in the file belongs to the "main" package package main // Go files almost always have one or more import statements import "fmt" // When the program runs, first run the "main&q ...