Essentially, goroutine is a coroutine. The difference is that Golang encapsulates and processes goroutine scheduling in many aspects such as runtime and system calls. When encountering long-term execution or system calls. (Recommended learning: go)
will actively transfer the CPU (P) of the current goroutine so that other goroutines can be scheduled and executed. That is, Golang supports coroutines from the language level. .
One of the major features of Golang is that it natively supports coroutines from the language level. You can create a coroutine by adding the go keyword in front of a function or method.
Comparison of other aspects
Memory consumption
Each goroutine (coroutine) occupies memory by default There are far fewer threads than Java and C.
goroutine: 2KB
Thread: 8MB
Thread and goroutine switching scheduling overhead
Thread/goroutine switching overhead, Goroutine is far smaller than threads
Threads: involve mode switching (switching from user mode to kernel mode), 16 registers, PC, SP... and other register refreshes, etc.
goroutine: only three register value modifications - PC/SP/DX.
We know that coroutine (coroutine) is a lightweight thread implementation in the Go language. Managed by the Go runtime.
Add the go keyword before a function call, and the call will be executed concurrently in a new goroutine. When the called function returns, this goroutine also ends automatically. It should be noted that if this function has a return value, the return value will be discarded.
First look at the following program code:
func Add(x, y int) {
z := x + y
fmt.Println(z)
}
func main() {
for i:=0; i<10; i++ {
go Add(i, i)
}
}When you execute the above code, you will find that nothing is printed on the screen and the program exits.
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