[Go] goroutine scheduling points

Places where Goroutines may yield to others are:

• Channel send and receive operations, if those operations would block.
• The Go statement, although there is no guarantee that new goroutine will be scheduled immediately.
• Blocking syscalls like file and network operations.
• After being stopped for a garbage collection cycle.

reference:

https://dave.cheney.net/2014/06/07/five-things-that-make-go-fast