Go - mutual exclusion
Ex. Binary semaphore Race Condition Semaphore Ex. sync.Mutex Mutex.Unlock happens before Mutex.Lock Every Lock needs Unlock, can use defe...
Recent Posts
Go - prevent race condition
Prevent race condition Initialize variables when package initialization phase, it will happen before main function. And don't modify those variables a...
Go - Cancel Job by close channel
Close a channel to broadcast cancellation No way to know a channel is closed or not, so need another channel to indicate a channel is closed This exa...
Go - Select Channel
Declare select { case <- ch: ... case x := <- ch2: &...
Go - parallel iteration
Inner goroutine can send event to outer goroutine by channel Ex. Pass value to inner routine function Declare a variable in inner goroutine function, ...
Go - buffered channel
Declare a queue: ch := make(chan int, 3) Block send when full, block receive when empty Get capacity: cap(ch) Get currently buffered: len(ch) ...
Go - unidirectional channel
Send only: chan<- int Receive only: <-chan int Violation will compile error Only channel used to send msg need to be closed, so to cl...
Go - pipelines
Ex. Make 3 channels and chan together, print in fmt.Println(<-channel) There is no way to check is a channel closed Close pipeline safely. Check rece...
Go - unbuffered channel
Unbuffered channel causes sender and receiver synchronized, called synchronized channel "When a value is sent on an unbuffered channel, the receipt of ...
Go - channel - basic
Declare ch := make(chan int) // unbuffered, send will be blocked until receive was called ch := make(chan int, 0) // unbuffered, send will be b...
Go - goroutine
Run f() in another goroutine: go f() To produce a race condition issue, can make for loop larger
Go - Type Switch
switch x.(type) { case: 。。 default:..} No fallthrough is allowed Reuse assert type result. switch x := x.(type) {...} Can combine more than one t...
Go - Type Assertion
X.(T) X is interface, T is concrete type. When T is a concrete type, it assert dynamic type of X is identical to T. Result is the dynamic value wi...
Go - Interface value
Real type of an interface variable is decided dynamatically Need be careful when comparing interface, panic will occur when real type is not comparable ...
Go - Interface Satisfaction - 2
When a type value assign to a variable, it can call method declared with type value and pointer When a type pointer assign to a variable, it can call...
Go - Interface Satisfaction - 1
A function declared with type (not a pointer), can call method by type value. Can use (&t) to call method by address as well When a function d...
Go - Interface Embedding
Declare embedding interface No problem if two interfaces have same method
Go - Interface Contracts
Don't need implement interface, only method is enough Compile error if signature is wrong, Although don't need declare "implements", but sti...
Go - encapsulation
Access control: upper case ecported to diiferent package It means the unit of encapsulation is package Difference Ex. type A int, can’t be encapsul...