/
timeoutlimit.go
59 lines (51 loc) · 965 Bytes
/
timeoutlimit.go
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/*
Author:ydy
Date:
Desc:
*/
package syncx
import (
"errors"
"time"
)
// ErrTimeout is an error that indicates the borrow timeout.
var ErrTimeout = errors.New("borrow timeout")
// A TimeoutLimit is used to borrow with timeouts.
type TimeoutLimit struct {
limit Limit
cond *Cond
}
// NewTimeoutLimit returns a TimeoutLimit.
func NewTimeoutLimit(n int) TimeoutLimit {
return TimeoutLimit{
limit: NewLimit(n),
cond: NewCond(),
}
}
func (m *TimeoutLimit) Borrow(timeout time.Duration) error{
var result = m.TryBorrow()
if result {
return nil
}
var ok bool
for{
timeout,ok = m.cond.WaitWithTimeout(timeout)
if ok && m.TryBorrow(){
return nil
}
if timeout <0 {
return ErrTimeout
}
}
}
func (m *TimeoutLimit) TryBorrow() bool{
return m.limit.TryBorrrow()
}
func (m *TimeoutLimit) Return() error{
err := m.limit.Return()
if err != nil{
return err
}
m.cond.Signal()
return nil
}