Goroutines, channels, select, sync package, WaitGroup, context and common concurrency patterns in Go.
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- What is a goroutine?
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A lightweight thread of execution managed by the Go runtime, cheaper than OS threads- What keyword launches a goroutine?
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go- What happens to all goroutines when main() exits?
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They are terminated immediately, regardless of whether they finished- How many goroutines can a Go program typically handle?
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Thousands to millions, depending on memory and system resources- Goroutines are scheduled by which Go runtime component?
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The scheduler, which multiplexes goroutines onto OS threads- What is a channel?
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A typed conduit for sending and receiving values between goroutines- Syntax to create an unbuffered channel of int
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make(chan int)- Syntax to create a buffered channel of string with capacity 5
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make(chan string, 5)- Syntax to send value x to channel c
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c <- x- Syntax to receive from channel c into variable v
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v := <-c- How to check if a value received from channel c is from a closed channel?
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v, ok := <-c; ok is false if the channel is closed- What happens when you send to a closed channel?
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panic- What value is returned when receiving from a closed channel?
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The zero value of the channel type- Syntax to close a channel c
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close(c)- How to iterate over values sent to channel c until it closes?
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for v := range c { ... }
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