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41 lines
641 B
Go
41 lines
641 B
Go
package exit
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import (
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"fmt"
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"sync"
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)
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type MutexMap struct {
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mu sync.Mutex // a separate mutex to protect the map
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m map[string]*sync.Mutex // map from IDs to mutexes
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}
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func NewMutexMap() *MutexMap {
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return &MutexMap{
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m: make(map[string]*sync.Mutex),
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}
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}
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func (mm *MutexMap) Lock(id string) {
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mm.mu.Lock()
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mutex, ok := mm.m[id]
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if !ok {
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mutex = &sync.Mutex{}
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mm.m[id] = mutex
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}
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mm.mu.Unlock()
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mutex.Lock()
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}
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func (mm *MutexMap) Unlock(id string) {
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mm.mu.Lock()
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mutex, ok := mm.m[id]
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mm.mu.Unlock()
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if !ok {
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panic(fmt.Sprintf("tried to unlock mutex for non-existent id %s", id))
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}
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mutex.Unlock()
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}
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