Golang waitgroup error
http://geekdaxue.co/read/qiaokate@lpo5kx/nc4es2 WebJul 19, 2024 · It happens because none of your wg.Done () is called, because your foo calls never return. They don't return because there is nothing to read from ch so c <- i is blocked forever. You need to put both wg.Wait () + close (ch) into their own separated goroutine. play.golang.org/p/JbQqVyZPqQ_U – zerkms Jul 19, 2024 at 5:10 3
Golang waitgroup error
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Webgo get-u github. com / golang / mock / gomock; go get-u github. com / golang / mock / mockgen; 二、 一个简单的demo. 假设 DB 是代码中负责与数据库交互的部分(在这里用 map 模拟)，测试用例中不能创建真实的数据库连接。这个时候，如果我们需要测试 GetFromDB 这个函数内部的逻辑，就 ... WebApr 14, 2024 · 前言 本文主要给大家介绍了关于Golang实现TCP连接的双向拷贝的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。 最简单的实 …
WebMar 14, 2024 · var wg sync.WaitGroup 那么，什么是WaitGroup呢？WaitGroup是一个结构，它包含了程序需要等待多少个goroutine的某些信息。它是一个包含你需要等待 … WebFeb 28, 2024 · 3. Fix with a WaitGroup 🔧. To ensure we wait for all workers to complete. WaitGroup has a simple API. Add(int) adds delta, which may be negative, to the …
Web$ go run waitgroups.go Worker 5 starting Worker 3 starting Worker 4 starting Worker 1 starting Worker 2 starting Worker 4 done Worker 1 done Worker 2 done Worker 5 done Worker 3 done The order of workers starting up and finishing is … WebMar 6, 2024 · Solution 1 Go program ends when the main function ends. From the language specification Program execution begins by initializing the main package and then invoking the function main. When that function invocation returns, the program exits. It does not wait for other (non-main) goroutines to complete.
WebDec 18, 2024 · The sync.WaitGroup struct in the sync package is used to wait for a group of goroutines to finish executing, and control is blocked until the group of goroutines finishes executing. Each... freewheel motor bicycle kitsWebApr 4, 2024 · type WaitGroup func (wg *WaitGroup) Add (delta int) func (wg *WaitGroup) Done () func (wg *WaitGroup) Wait () Examples Once Pool WaitGroup Constants This … fashion knitting walking shoes factoriesWebSep 30, 2024 · 1. You can use Context, in the following way: func doWork (ctx context.Context, element Element, wg &sync.WaitGroup) { defer wg.Done () done := … free wheel of fortune game download for pcWebDec 5, 2024 · As you can see, we’ve instantiated a new sync.WaitGroup and then called the .Add(1) method, before attempting to execute our goroutine.. We’ve updated the … fashionlab agencyWebDec 3, 2024 · WaitGroup, provided in the sync package, allows a program to wait for specified goroutines. These are sync mechanisms in Golang that block the execution of … free wheel of fortune game online no downloadWebThe trick to use sync.WaitGroup and chan together is that we wrap: select { case err := <-p.errors: return err default: p.wg.Done () } Together in a for loop: for { select { case err := <-p.errors: return err default: p.wg.Done () } } In this case select will always check for errors and wait if nothing happens :) Share Improve this answer fashion korean clothesWebJun 21, 2016 · Put wg.Add (1) before each go func () line, instead of doing it in a single go with wg.Add (gorutineCt) Put defer wg.Done () at the start of each goroutine enclosure, instead of calling wg.Done () in every exit case. This ensures wg.Done () gets run regardless. Use a closer routine instead of trying to buffer a channel sufficiently: free wheel of fortune game online