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30 lines
449 B
Go
30 lines
449 B
Go
package sync
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import "sync"
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type guard struct {
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mu sync.Mutex
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taken map[string]struct{}
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}
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func newGuard() *guard {
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return &guard{
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taken: make(map[string]struct{}),
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}
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}
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func (g *guard) TryTake(id string) bool {
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g.mu.Lock()
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defer g.mu.Unlock()
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if _, exists := g.taken[id]; exists {
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return false
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}
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g.taken[id] = struct{}{}
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return true
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}
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func (g *guard) Release(id string) {
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g.mu.Lock()
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defer g.mu.Unlock()
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delete(g.taken, id)
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}
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