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moby--moby/libcontainerd/pausemonitor_unix.go

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// +build !windows
package libcontainerd
import (
"sync"
)
// pauseMonitor is helper to get notifications from pause state changes.
type pauseMonitor struct {
sync.Mutex
waiters map[string][]chan struct{}
}
func (m *pauseMonitor) handle(t string) {
m.Lock()
defer m.Unlock()
if m.waiters == nil {
return
}
q, ok := m.waiters[t]
if !ok {
return
}
if len(q) > 0 {
close(q[0])
m.waiters[t] = q[1:]
}
}
func (m *pauseMonitor) append(t string, waiter chan struct{}) {
m.Lock()
defer m.Unlock()
if m.waiters == nil {
m.waiters = make(map[string][]chan struct{})
}
_, ok := m.waiters[t]
if !ok {
m.waiters[t] = make([]chan struct{}, 0)
}
m.waiters[t] = append(m.waiters[t], waiter)
}