mirror of
https://github.com/netbirdio/netbird.git
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9ba067391f
- Remove WaitGroup, make SemaphoreGroup a pure semaphore - Make Add() return error instead of silently failing on context cancel - Remove context parameter from Done() to prevent slot leaks - Fix missing Done() call in conn.go error path
34 lines
722 B
Go
34 lines
722 B
Go
package semaphoregroup
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import (
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"context"
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)
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// SemaphoreGroup is a custom type that combines sync.WaitGroup and a semaphore.
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type SemaphoreGroup struct {
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semaphore chan struct{}
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}
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// NewSemaphoreGroup creates a new SemaphoreGroup with the specified semaphore limit.
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func NewSemaphoreGroup(limit int) *SemaphoreGroup {
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return &SemaphoreGroup{
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semaphore: make(chan struct{}, limit),
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}
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}
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// Add acquire a slot
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func (sg *SemaphoreGroup) Add(ctx context.Context) error {
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// Acquire semaphore slot
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select {
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case <-ctx.Done():
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return ctx.Err()
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case sg.semaphore <- struct{}{}:
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return nil
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}
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}
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// Done releases a slot. Must be called after a successful Add.
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func (sg *SemaphoreGroup) Done() {
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<-sg.semaphore
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}
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