mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-23 22:27:38 -05:00
57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
// Copyright 2015 Light Code Labs, LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddytls
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import (
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"fmt"
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"sync"
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)
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var _ Locker = &syncLock{}
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type syncLock struct {
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nameLocks map[string]*sync.WaitGroup
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nameLocksMu sync.Mutex
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}
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// TryLock attempts to get a lock for name, otherwise it returns
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// a Waiter value to wait until the other process is finished.
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func (s *syncLock) TryLock(name string) (Waiter, error) {
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s.nameLocksMu.Lock()
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defer s.nameLocksMu.Unlock()
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wg, ok := s.nameLocks[name]
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if ok {
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// lock already obtained, let caller wait on it
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return wg, nil
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}
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// caller gets lock
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wg = new(sync.WaitGroup)
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wg.Add(1)
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s.nameLocks[name] = wg
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return nil, nil
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}
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// Unlock unlocks name.
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func (s *syncLock) Unlock(name string) error {
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s.nameLocksMu.Lock()
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defer s.nameLocksMu.Unlock()
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wg, ok := s.nameLocks[name]
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if !ok {
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return fmt.Errorf("FileStorage: no lock to release for %s", name)
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}
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wg.Done()
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delete(s.nameLocks, name)
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return nil
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}
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