[Golang] Mutual exclusion in the end who do? Channel or mutex?

This is a created article in which the information may have evolved or changed. Channel
– Essentially a MessageQueue
– Very Orthodox implementation of inter-body communication facilities
sync. Mutex/rwmutex/cond/etc
– Do not treat the channel as a balm, the Mutex is still

• Myths
– Use channel for mutual exclusion (normal should let mutex do)
• For example, multiple Goroutine access a set of shared variables
Channel Cost – as a message queue, the channel cost is higher than the Mutex
– Where is the cost?
Channel has a Mutex inside it because it belongs to a shared variable.
There may be Cond inside the channel to wait or wake up the condition
Goroutine
• Assign the CPU and let another goroutine get execution opportunity, this cut
The replacement period is much higher than the cost of the Mutex to check the competitive state (the latter is usually
Just an atomic operation)