/
pktbuf.go
85 lines (68 loc) · 1.14 KB
/
pktbuf.go
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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package drpcstream
import (
"sync"
)
type packetBuffer struct {
mu sync.Mutex
cond sync.Cond
err error
data []byte
set bool
held bool
}
func (pb *packetBuffer) init() {
pb.cond.L = &pb.mu
}
func (pb *packetBuffer) Close(err error) {
pb.mu.Lock()
defer pb.mu.Unlock()
for pb.held {
pb.cond.Wait()
}
if pb.err == nil {
pb.data = nil
pb.set = false
pb.err = err
pb.cond.Broadcast()
}
}
func (pb *packetBuffer) Put(data []byte) {
pb.mu.Lock()
defer pb.mu.Unlock()
for pb.set && pb.err == nil {
pb.cond.Wait()
}
if pb.err != nil {
return
}
pb.data = data
pb.set = true
pb.held = false
pb.cond.Broadcast()
for pb.set || pb.held {
pb.cond.Wait()
}
}
func (pb *packetBuffer) Get() ([]byte, error) {
pb.mu.Lock()
defer pb.mu.Unlock()
for !pb.set && pb.err == nil {
pb.cond.Wait()
}
if pb.err != nil {
return nil, pb.err
}
pb.held = true
pb.cond.Broadcast()
return pb.data, nil
}
func (pb *packetBuffer) Done() {
pb.mu.Lock()
defer pb.mu.Unlock()
pb.data = nil
pb.set = false
pb.held = false
pb.cond.Broadcast()
}