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// Copyright 2025 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package osutil
import (
"fmt"
)
type Semaphore struct {
ch chan struct{}
}
func NewSemaphore(count int) *Semaphore {
s := &Semaphore{
ch: make(chan struct{}, count),
}
for i := 0; i < count; i++ {
s.Signal()
}
return s
}
func (s *Semaphore) Wait() {
<-s.ch
}
func (s *Semaphore) WaitC() <-chan struct{} {
return s.ch
}
func (s *Semaphore) Available() int {
return len(s.ch)
}
func (s *Semaphore) Signal() {
if av := s.Available(); av == cap(s.ch) {
// Not super reliable, but let it be here just in case.
panic(fmt.Sprintf("semaphore capacity (%v) is exceeded (%v)", cap(s.ch), av))
}
s.ch <- struct{}{}
}
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