Go Atomic count

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By atomic counting, the same numeric value can be added and reduced in multi-threaded cases, which is generally used for state synchronization.
Look at the code first:

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Package Main Import"FMT" Import"Time" Import"Sync/atomic" Import"Runtime" Func Main() { //define an integer var opsUInt64 = 0 //Use 50 threads to accumulate values for OPS forI:= 0;I< -;I++ { Go func() { for { //Add 1 per time Atomic.AddUint64(&Ops,1) //This function is used for time slice switching //Can be understood as the premium version of time. Sleep () //Avoid the previous for loop to put the CPU time slice in one thread, so that other threads do not have the opportunity to execute Runtime.gosched() } }() } //Stop for one second, the top 50 threads have 1 seconds of execution time Time.Sleep( Time.Second) //Get Results Opsfinal:=Atomic.LoadUint64(&Ops) Fmt.Println("Ops:",Opsfinal) }

The printing results are similar:
ops:40200

If you do not use an atomic count, using the OPS =ops+1 directly results in a multi-threaded count that is inaccurate.
Open go source in the atomic package, you can see the relevant algorithms are written in assembly language. So the atomic count performs very efficiently.

This entry was posted on October 6, 2015. belongs to the Go language category. The author is Baiyuxiong.

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