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proc.go
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proc.go
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package gokrazy
import "sync"
type statusCode int32
const (
Stopped statusCode = iota // Process not running
Running // Process was started and is very likely still running
Stopping // Process is being stopped, but it might still be running
)
type processState struct {
lock sync.Mutex
statusChange *sync.Cond
status statusCode
}
func NewProcessState() *processState {
p := &processState{}
p.statusChange = sync.NewCond(&p.lock)
return p
}
func (p *processState) Get() statusCode {
p.lock.Lock()
defer p.lock.Unlock()
return p.status
}
func (p *processState) Set(status statusCode) {
p.lock.Lock()
defer p.lock.Unlock()
if p.status == Stopped && status == Stopping {
// Not a valid state transition. Ignore it.
return
}
p.status = status
p.statusChange.Broadcast()
}
func (p *processState) WaitTill(status statusCode) {
p.lock.Lock()
defer p.lock.Unlock()
for p.status != status {
p.statusChange.Wait()
}
}