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28 lines
522 B
Go
28 lines
522 B
Go
package semaphore
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// Instance is an implementation of semaphore.
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type Instance struct {
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token chan struct{}
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}
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// New create a new Semaphore with n permits.
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func New(n int) *Instance {
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s := &Instance{
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token: make(chan struct{}, n),
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}
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for i := 0; i < n; i++ {
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s.token <- struct{}{}
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}
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return s
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}
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// Wait returns a channel for acquiring a permit.
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func (s *Instance) Wait() <-chan struct{} {
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return s.token
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}
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// Signal releases a permit into the semaphore.
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func (s *Instance) Signal() {
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s.token <- struct{}{}
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}
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