Brother Lian Blockchain training share go language-write concurrency considerations

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The go language is primarily used as a server-side development, targeting the development of "large software", suitable for many programmers to develop large-scale software together, and the development cycle of long-term support for cloud computing network services. The go language enables programmers to develop quickly, and it makes it easier for programmers to maintain and modify the software as it grows. It combines the efficiency of a traditional compiled language with the ease of use and expression of a scripting language.

Some points to note when writing go language concurrency:

1. Golang 1.2 version Goroutine runtime. Gomaxprocs if it is not defined, the default is 1, from 1.5 to the default is Runtime.cpunum (), go to the bottom is actually gomaxprocs threads and then concurrency. But concurrency is also every goroutine run, not real concurrent polling, so you have to let Goroutine join polling schedule runtime. Gosched (), to ensure that all goroutine go hand in hand, take the following procedure as an example, if you do not join the polling schedule, because the Say function goroutine is a dead loop, so will never be a context switch, also led to never output the world, The main thread will always occupy the CPU time slice.

Package Main

Import (

"FMT"

"Runtime"

)

Func say (s string) {

For I: = 0; I < 5; i++ {

Runtime. Gosched ()//Let the goroutine of this function perform a go polling schedule

Fmt. PRINTLN (s)

}

}

Func Main () {

Go Say ("World")

Say ("Hello")

}

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