sema: Semaphores for Go

Author & Version

Author: Tylor Arndt 0.95 RC - API may change. (Bug reports and PRs are welcome)

Features

Semaphore variants provided are:

• Binary semaphores
• Counting semaphores
• Counting semaphores with timeout support
• Context support was recently added

All written in pure Go.

Implementations

Previously there was a sync.Cond based implemenation that was removed with Go runtime performance improvements rendered it overly complex for a small performance gain over the channel-based implemenation.

Getting Started

In sema.go you will find the three default constructors and related core interfaces.

	func NewSemaphore() Semaphore {...}
	func NewCountingSema(count uint) CountingSema {...}
	func NewTimeoutSema(count uint, defaultTimeout time.Duration) TimeoutCountingSema {...}

The Semaphore interface is extended from being binary to counting by CountingSema which in turn is enhanced with time-out support in its TimeoutCountingSema variant.