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48 lines
708 B
Go
48 lines
708 B
Go
// package chainlock implements a mutex whose Lock and Unlock
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// methods return the lock itself, to enable chaining.
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//
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// Intended Usage
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//
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// defer s.lock().unlock()
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// // drop lock while waiting for wait group
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// func() {
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// defer a.l.Unlock().Lock()
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// fssesDone.Wait()
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// }()
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//
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package chainlock
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import "sync"
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type L struct {
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mtx sync.Mutex
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}
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func New() *L {
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return &L{}
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}
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func (l *L) Lock() *L {
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l.mtx.Lock()
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return l
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}
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func (l *L) Unlock() *L {
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l.mtx.Unlock()
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return l
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}
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func (l *L) NewCond() *sync.Cond {
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return sync.NewCond(&l.mtx)
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}
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func (l *L) DropWhile(f func()) {
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defer l.Unlock().Lock()
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f()
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}
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func (l *L) HoldWhile(f func()) {
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defer l.Lock().Unlock()
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f()
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}
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