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55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
/*
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* Minio Client (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Package yielder relinquishes control to other go routines more
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// frequently in the middle of busy I/O activity
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package yielder
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import (
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"io"
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"runtime"
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)
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// NewReader returns an initialized yielding proxy reader.
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func NewReader(reader io.Reader) *Reader {
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return &Reader{reader, true}
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}
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// Reader implements io.Reader compatible scheduler.
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type Reader struct {
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io.Reader
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enabled bool
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}
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// Read yields CPU to other go routines. Useful in making low-priority I/O routines.
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func (r Reader) Read(p []byte) (n int, err error) {
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if r.enabled {
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runtime.Gosched()
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}
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n, err = r.Reader.Read(p)
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return
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}
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// Enable turns on the yielder.
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func (r *Reader) Enable() {
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r.enabled = true
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}
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// Disable turns off the yielder.
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func (r *Reader) Disable() {
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r.enabled = false
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}
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