Concurrency in GoLang

• Go provides very good support for concurrency using Go Routines or channels.
• It takes advantage of efficient memory management strategies and multicore processor architecture for implementing concurrency.

Constructs

Construct	Package	Description	Sample Code
Mutex	sync	We can use a mutex to safely access data across multiple goroutines. - Lock the mutex before accessing counters; unlock it at the end of the function using a defer statement. - sync.RWMutex lets multiple goroutines read simultaneously (via RLock), but still enforces exclusive access for writes (Lock).	type Test struct { mu sync.Mutex } - c.mu.Lock() - defer c.mu.Unlock() - c.counter++
WaitGroup	sync	A WaitGroup waits for a collection of goroutines to finish. The main goroutine calls Add() to set the number of goroutines to wait for.	var wg sync.WaitGroup - wg.Add(1) // Always call wg.Add() before you launch the goroutine that will call wg.Done(). - wg.Done() //Recommended to call WaitGroup.Done() deferred, so it gets called even if the goroutine panics. - wg.Wait() //wg.Wait() will block until wg.Done() is called.
Once	sync	Once is an object that will perform exactly one action.	var once sync.Once - once.Do(func() {singleInstance = new(single)})

References

• Go Concurrency Patterns: Timing out, moving on
• Crack the top 50 Golang interview questions
• Goroutine Leaks - The Forgotten Sender
• Mutex in Golang
• Why is my goroutine not executed?
• A little about Goroutines in Go!