Go channel simple notes

go The channel of is used for goroutine Communication and data synchronization between , yes go One of the more important types in

nil passageway ：

not used make For initialization chan The default value is nil, Read / write in nil The channel will permanently block the current process , close nil Channel meeting panic

No buffer channel ：

Use make If the number of channels is not specified when initializing them, they are unbuffered channels , Both reading and writing must be operated at the same time to prevent blocking , When there is reading but no writing , Read will block , When there is writing but no reading , Writing will block

There are buffer channels ：

Use make When initializing channels, the specified number is buffered channels , When the buffer is not full , Writing will not block , Otherwise blocking ; When there is data in the buffer , Reading will not block , Otherwise blocking

Closed channel ：

Use close(ch) After closing the channel , Reading this channel will immediately return the zero value of this channel type , Writing to a closed channel will panic

When using channels , Attention should be paid to the problem that the cooperation process cannot exit due to the blockage of the operation channel , This leads to memory leaks