50 lines
619 B
Go
50 lines
619 B
Go
package solver
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import "sync"
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func newSignaller() *signal {
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return &signal{}
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}
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type signal struct {
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mu sync.Mutex
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ch chan struct{}
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}
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func (s *signal) Wait() chan struct{} {
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s.mu.Lock()
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if s.ch == nil {
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s.ch = make(chan struct{})
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}
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ch := s.ch
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s.mu.Unlock()
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return ch
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}
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func (s *signal) Reset() chan struct{} {
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s.mu.Lock()
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ch := s.ch
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select {
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case <-ch:
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ch = make(chan struct{})
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s.ch = ch
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default:
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}
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s.mu.Unlock()
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return ch
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}
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func (s *signal) Signal() {
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s.mu.Lock()
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if s.ch == nil {
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s.ch = make(chan struct{})
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}
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ch := s.ch
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select {
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case <-ch:
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default:
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close(ch)
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}
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s.mu.Unlock()
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}
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