Fix races in the log module by using syncmap (#1421)
This commit is contained in:
parent
5d6b71fdbb
commit
93c25c9a35
5 changed files with 455 additions and 26 deletions
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@ -12,6 +12,8 @@ import (
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"runtime"
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"strings"
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"sync"
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"golang.org/x/sync/syncmap"
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)
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var (
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@ -42,10 +44,11 @@ func NewLogger(bufLen int64, mode, config string) {
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// DelLogger removes loggers that are for the given mode
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func DelLogger(mode string) error {
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for _, l := range loggers {
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if _, ok := l.outputs[mode]; ok {
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if _, ok := l.outputs.Load(mode); ok {
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return l.DelLogger(mode)
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}
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}
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Trace("Log adapter %s not found, no need to delete", mode)
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return nil
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}
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@ -177,16 +180,15 @@ type Logger struct {
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lock sync.Mutex
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level int
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msg chan *logMsg
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outputs map[string]LoggerInterface
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outputs syncmap.Map
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quit chan bool
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}
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// newLogger initializes and returns a new logger.
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func newLogger(buffer int64) *Logger {
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l := &Logger{
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msg: make(chan *logMsg, buffer),
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outputs: make(map[string]LoggerInterface),
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quit: make(chan bool),
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msg: make(chan *logMsg, buffer),
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quit: make(chan bool),
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}
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go l.StartLogger()
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return l
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@ -194,14 +196,12 @@ func newLogger(buffer int64) *Logger {
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// SetLogger sets new logger instance with given logger adapter and config.
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func (l *Logger) SetLogger(adapter string, config string) error {
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l.lock.Lock()
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defer l.lock.Unlock()
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if log, ok := adapters[adapter]; ok {
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lg := log()
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if err := lg.Init(config); err != nil {
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return err
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}
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l.outputs[adapter] = lg
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l.outputs.Store(adapter, lg)
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l.adapter = adapter
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} else {
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panic("log: unknown adapter \"" + adapter + "\" (forgotten register?)")
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@ -211,11 +211,9 @@ func (l *Logger) SetLogger(adapter string, config string) error {
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// DelLogger removes a logger adapter instance.
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func (l *Logger) DelLogger(adapter string) error {
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l.lock.Lock()
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defer l.lock.Unlock()
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if lg, ok := l.outputs[adapter]; ok {
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lg.Destroy()
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delete(l.outputs, adapter)
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if lg, ok := l.outputs.Load(adapter); ok {
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lg.(LoggerInterface).Destroy()
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l.outputs.Delete(adapter)
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} else {
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panic("log: unknown adapter \"" + adapter + "\" (forgotten register?)")
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}
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@ -264,11 +262,12 @@ func (l *Logger) StartLogger() {
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for {
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select {
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case bm := <-l.msg:
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for _, l := range l.outputs {
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if err := l.WriteMsg(bm.msg, bm.skip, bm.level); err != nil {
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l.outputs.Range(func(k, v interface{}) bool {
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if err := v.(LoggerInterface).WriteMsg(bm.msg, bm.skip, bm.level); err != nil {
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fmt.Println("ERROR, unable to WriteMsg:", err)
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}
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}
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return true
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})
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case <-l.quit:
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return
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}
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@ -277,9 +276,10 @@ func (l *Logger) StartLogger() {
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// Flush flushes all chan data.
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func (l *Logger) Flush() {
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for _, l := range l.outputs {
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l.Flush()
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}
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l.outputs.Range(func(k, v interface{}) bool {
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v.(LoggerInterface).Flush()
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return true
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})
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}
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// Close closes logger, flush all chan data and destroy all adapter instances.
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@ -288,19 +288,21 @@ func (l *Logger) Close() {
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for {
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if len(l.msg) > 0 {
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bm := <-l.msg
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for _, l := range l.outputs {
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if err := l.WriteMsg(bm.msg, bm.skip, bm.level); err != nil {
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l.outputs.Range(func(k, v interface{}) bool {
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if err := v.(LoggerInterface).WriteMsg(bm.msg, bm.skip, bm.level); err != nil {
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fmt.Println("ERROR, unable to WriteMsg:", err)
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}
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}
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return true
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})
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} else {
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break
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}
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}
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for _, l := range l.outputs {
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l.Flush()
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l.Destroy()
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}
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l.outputs.Range(func(k, v interface{}) bool {
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v.(LoggerInterface).Flush()
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v.(LoggerInterface).Destroy()
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return true
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})
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}
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// Trace records trace log
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27
vendor/golang.org/x/sync/LICENSE
generated
vendored
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27
vendor/golang.org/x/sync/LICENSE
generated
vendored
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@ -0,0 +1,27 @@
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Copyright (c) 2009 The Go Authors. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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22
vendor/golang.org/x/sync/PATENTS
generated
vendored
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22
vendor/golang.org/x/sync/PATENTS
generated
vendored
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@ -0,0 +1,22 @@
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Additional IP Rights Grant (Patents)
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"This implementation" means the copyrightable works distributed by
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Google as part of the Go project.
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Google hereby grants to You a perpetual, worldwide, non-exclusive,
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no-charge, royalty-free, irrevocable (except as stated in this section)
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patent license to make, have made, use, offer to sell, sell, import,
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transfer and otherwise run, modify and propagate the contents of this
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implementation of Go, where such license applies only to those patent
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claims, both currently owned or controlled by Google and acquired in
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the future, licensable by Google that are necessarily infringed by this
|
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implementation of Go. This grant does not include claims that would be
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infringed only as a consequence of further modification of this
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implementation. If you or your agent or exclusive licensee institute or
|
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order or agree to the institution of patent litigation against any
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entity (including a cross-claim or counterclaim in a lawsuit) alleging
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that this implementation of Go or any code incorporated within this
|
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implementation of Go constitutes direct or contributory patent
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infringement, or inducement of patent infringement, then any patent
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rights granted to you under this License for this implementation of Go
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shall terminate as of the date such litigation is filed.
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372
vendor/golang.org/x/sync/syncmap/map.go
generated
vendored
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372
vendor/golang.org/x/sync/syncmap/map.go
generated
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@ -0,0 +1,372 @@
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package syncmap provides a concurrent map implementation.
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// It is a prototype for a proposed addition to the sync package
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// in the standard library.
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// (https://golang.org/issue/18177)
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package syncmap
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import (
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"sync"
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"sync/atomic"
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"unsafe"
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)
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// Map is a concurrent map with amortized-constant-time loads, stores, and deletes.
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// It is safe for multiple goroutines to call a Map's methods concurrently.
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//
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// The zero Map is valid and empty.
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//
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// A Map must not be copied after first use.
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type Map struct {
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mu sync.Mutex
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// read contains the portion of the map's contents that are safe for
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// concurrent access (with or without mu held).
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//
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// The read field itself is always safe to load, but must only be stored with
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// mu held.
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//
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// Entries stored in read may be updated concurrently without mu, but updating
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// a previously-expunged entry requires that the entry be copied to the dirty
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// map and unexpunged with mu held.
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read atomic.Value // readOnly
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// dirty contains the portion of the map's contents that require mu to be
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// held. To ensure that the dirty map can be promoted to the read map quickly,
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// it also includes all of the non-expunged entries in the read map.
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//
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// Expunged entries are not stored in the dirty map. An expunged entry in the
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// clean map must be unexpunged and added to the dirty map before a new value
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// can be stored to it.
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//
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// If the dirty map is nil, the next write to the map will initialize it by
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// making a shallow copy of the clean map, omitting stale entries.
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dirty map[interface{}]*entry
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// misses counts the number of loads since the read map was last updated that
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// needed to lock mu to determine whether the key was present.
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//
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// Once enough misses have occurred to cover the cost of copying the dirty
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// map, the dirty map will be promoted to the read map (in the unamended
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// state) and the next store to the map will make a new dirty copy.
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misses int
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}
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// readOnly is an immutable struct stored atomically in the Map.read field.
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type readOnly struct {
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m map[interface{}]*entry
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amended bool // true if the dirty map contains some key not in m.
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}
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// expunged is an arbitrary pointer that marks entries which have been deleted
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// from the dirty map.
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var expunged = unsafe.Pointer(new(interface{}))
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// An entry is a slot in the map corresponding to a particular key.
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type entry struct {
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// p points to the interface{} value stored for the entry.
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//
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// If p == nil, the entry has been deleted and m.dirty == nil.
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//
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// If p == expunged, the entry has been deleted, m.dirty != nil, and the entry
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// is missing from m.dirty.
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//
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// Otherwise, the entry is valid and recorded in m.read.m[key] and, if m.dirty
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// != nil, in m.dirty[key].
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//
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// An entry can be deleted by atomic replacement with nil: when m.dirty is
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// next created, it will atomically replace nil with expunged and leave
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// m.dirty[key] unset.
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//
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// An entry's associated value can be updated by atomic replacement, provided
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// p != expunged. If p == expunged, an entry's associated value can be updated
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// only after first setting m.dirty[key] = e so that lookups using the dirty
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// map find the entry.
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p unsafe.Pointer // *interface{}
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}
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func newEntry(i interface{}) *entry {
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return &entry{p: unsafe.Pointer(&i)}
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}
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// Load returns the value stored in the map for a key, or nil if no
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// value is present.
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// The ok result indicates whether value was found in the map.
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func (m *Map) Load(key interface{}) (value interface{}, ok bool) {
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read, _ := m.read.Load().(readOnly)
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e, ok := read.m[key]
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if !ok && read.amended {
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m.mu.Lock()
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// Avoid reporting a spurious miss if m.dirty got promoted while we were
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// blocked on m.mu. (If further loads of the same key will not miss, it's
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// not worth copying the dirty map for this key.)
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read, _ = m.read.Load().(readOnly)
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e, ok = read.m[key]
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if !ok && read.amended {
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e, ok = m.dirty[key]
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// Regardless of whether the entry was present, record a miss: this key
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// will take the slow path until the dirty map is promoted to the read
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// map.
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m.missLocked()
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}
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m.mu.Unlock()
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}
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if !ok {
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return nil, false
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}
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return e.load()
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}
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func (e *entry) load() (value interface{}, ok bool) {
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p := atomic.LoadPointer(&e.p)
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if p == nil || p == expunged {
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return nil, false
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}
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return *(*interface{})(p), true
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}
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// Store sets the value for a key.
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func (m *Map) Store(key, value interface{}) {
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read, _ := m.read.Load().(readOnly)
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if e, ok := read.m[key]; ok && e.tryStore(&value) {
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return
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}
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m.mu.Lock()
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read, _ = m.read.Load().(readOnly)
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if e, ok := read.m[key]; ok {
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if e.unexpungeLocked() {
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// The entry was previously expunged, which implies that there is a
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// non-nil dirty map and this entry is not in it.
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m.dirty[key] = e
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}
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e.storeLocked(&value)
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} else if e, ok := m.dirty[key]; ok {
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e.storeLocked(&value)
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} else {
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if !read.amended {
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// We're adding the first new key to the dirty map.
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// Make sure it is allocated and mark the read-only map as incomplete.
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m.dirtyLocked()
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m.read.Store(readOnly{m: read.m, amended: true})
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}
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m.dirty[key] = newEntry(value)
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}
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m.mu.Unlock()
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}
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// tryStore stores a value if the entry has not been expunged.
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//
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// If the entry is expunged, tryStore returns false and leaves the entry
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// unchanged.
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func (e *entry) tryStore(i *interface{}) bool {
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p := atomic.LoadPointer(&e.p)
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if p == expunged {
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return false
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}
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for {
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if atomic.CompareAndSwapPointer(&e.p, p, unsafe.Pointer(i)) {
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return true
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}
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p = atomic.LoadPointer(&e.p)
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if p == expunged {
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return false
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}
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}
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}
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// unexpungeLocked ensures that the entry is not marked as expunged.
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//
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// If the entry was previously expunged, it must be added to the dirty map
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// before m.mu is unlocked.
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func (e *entry) unexpungeLocked() (wasExpunged bool) {
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return atomic.CompareAndSwapPointer(&e.p, expunged, nil)
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}
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// storeLocked unconditionally stores a value to the entry.
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//
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// The entry must be known not to be expunged.
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func (e *entry) storeLocked(i *interface{}) {
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atomic.StorePointer(&e.p, unsafe.Pointer(i))
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}
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// LoadOrStore returns the existing value for the key if present.
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// Otherwise, it stores and returns the given value.
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// The loaded result is true if the value was loaded, false if stored.
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func (m *Map) LoadOrStore(key, value interface{}) (actual interface{}, loaded bool) {
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// Avoid locking if it's a clean hit.
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read, _ := m.read.Load().(readOnly)
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if e, ok := read.m[key]; ok {
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actual, loaded, ok := e.tryLoadOrStore(value)
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if ok {
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return actual, loaded
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}
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}
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m.mu.Lock()
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read, _ = m.read.Load().(readOnly)
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if e, ok := read.m[key]; ok {
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if e.unexpungeLocked() {
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m.dirty[key] = e
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}
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actual, loaded, _ = e.tryLoadOrStore(value)
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} else if e, ok := m.dirty[key]; ok {
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actual, loaded, _ = e.tryLoadOrStore(value)
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m.missLocked()
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} else {
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if !read.amended {
|
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// We're adding the first new key to the dirty map.
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// Make sure it is allocated and mark the read-only map as incomplete.
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m.dirtyLocked()
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m.read.Store(readOnly{m: read.m, amended: true})
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}
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m.dirty[key] = newEntry(value)
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actual, loaded = value, false
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}
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m.mu.Unlock()
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return actual, loaded
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}
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// tryLoadOrStore atomically loads or stores a value if the entry is not
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// expunged.
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//
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// If the entry is expunged, tryLoadOrStore leaves the entry unchanged and
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// returns with ok==false.
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func (e *entry) tryLoadOrStore(i interface{}) (actual interface{}, loaded, ok bool) {
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p := atomic.LoadPointer(&e.p)
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if p == expunged {
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return nil, false, false
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}
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if p != nil {
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return *(*interface{})(p), true, true
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}
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|
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// Copy the interface after the first load to make this method more amenable
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// to escape analysis: if we hit the "load" path or the entry is expunged, we
|
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// shouldn't bother heap-allocating.
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ic := i
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for {
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if atomic.CompareAndSwapPointer(&e.p, nil, unsafe.Pointer(&ic)) {
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return i, false, true
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}
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p = atomic.LoadPointer(&e.p)
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if p == expunged {
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return nil, false, false
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}
|
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if p != nil {
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return *(*interface{})(p), true, true
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}
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}
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}
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// Delete deletes the value for a key.
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func (m *Map) Delete(key interface{}) {
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read, _ := m.read.Load().(readOnly)
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e, ok := read.m[key]
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if !ok && read.amended {
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m.mu.Lock()
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read, _ = m.read.Load().(readOnly)
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e, ok = read.m[key]
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if !ok && read.amended {
|
||||
delete(m.dirty, key)
|
||||
}
|
||||
m.mu.Unlock()
|
||||
}
|
||||
if ok {
|
||||
e.delete()
|
||||
}
|
||||
}
|
||||
|
||||
func (e *entry) delete() (hadValue bool) {
|
||||
for {
|
||||
p := atomic.LoadPointer(&e.p)
|
||||
if p == nil || p == expunged {
|
||||
return false
|
||||
}
|
||||
if atomic.CompareAndSwapPointer(&e.p, p, nil) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Range calls f sequentially for each key and value present in the map.
|
||||
// If f returns false, range stops the iteration.
|
||||
//
|
||||
// Range does not necessarily correspond to any consistent snapshot of the Map's
|
||||
// contents: no key will be visited more than once, but if the value for any key
|
||||
// is stored or deleted concurrently, Range may reflect any mapping for that key
|
||||
// from any point during the Range call.
|
||||
//
|
||||
// Range may be O(N) with the number of elements in the map even if f returns
|
||||
// false after a constant number of calls.
|
||||
func (m *Map) Range(f func(key, value interface{}) bool) {
|
||||
// We need to be able to iterate over all of the keys that were already
|
||||
// present at the start of the call to Range.
|
||||
// If read.amended is false, then read.m satisfies that property without
|
||||
// requiring us to hold m.mu for a long time.
|
||||
read, _ := m.read.Load().(readOnly)
|
||||
if read.amended {
|
||||
// m.dirty contains keys not in read.m. Fortunately, Range is already O(N)
|
||||
// (assuming the caller does not break out early), so a call to Range
|
||||
// amortizes an entire copy of the map: we can promote the dirty copy
|
||||
// immediately!
|
||||
m.mu.Lock()
|
||||
read, _ = m.read.Load().(readOnly)
|
||||
if read.amended {
|
||||
read = readOnly{m: m.dirty}
|
||||
m.read.Store(read)
|
||||
m.dirty = nil
|
||||
m.misses = 0
|
||||
}
|
||||
m.mu.Unlock()
|
||||
}
|
||||
|
||||
for k, e := range read.m {
|
||||
v, ok := e.load()
|
||||
if !ok {
|
||||
continue
|
||||
}
|
||||
if !f(k, v) {
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Map) missLocked() {
|
||||
m.misses++
|
||||
if m.misses < len(m.dirty) {
|
||||
return
|
||||
}
|
||||
m.read.Store(readOnly{m: m.dirty})
|
||||
m.dirty = nil
|
||||
m.misses = 0
|
||||
}
|
||||
|
||||
func (m *Map) dirtyLocked() {
|
||||
if m.dirty != nil {
|
||||
return
|
||||
}
|
||||
|
||||
read, _ := m.read.Load().(readOnly)
|
||||
m.dirty = make(map[interface{}]*entry, len(read.m))
|
||||
for k, e := range read.m {
|
||||
if !e.tryExpungeLocked() {
|
||||
m.dirty[k] = e
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (e *entry) tryExpungeLocked() (isExpunged bool) {
|
||||
p := atomic.LoadPointer(&e.p)
|
||||
for p == nil {
|
||||
if atomic.CompareAndSwapPointer(&e.p, nil, expunged) {
|
||||
return true
|
||||
}
|
||||
p = atomic.LoadPointer(&e.p)
|
||||
}
|
||||
return p == expunged
|
||||
}
|
6
vendor/vendor.json
vendored
6
vendor/vendor.json
vendored
|
@ -1266,6 +1266,12 @@
|
|||
"revision": "569280fa63be4e201b975e5411e30a92178f0118",
|
||||
"revisionTime": "2016-11-03T00:14:07Z"
|
||||
},
|
||||
{
|
||||
"checksumSHA1": "4TEYFKrAUuwBMqExjQBsnf/CgjQ=",
|
||||
"path": "golang.org/x/sync/syncmap",
|
||||
"revision": "5a06fca2c336a4b2b2fcb45702e8c47621b2aa2c",
|
||||
"revisionTime": "2017-03-17T17:13:11Z"
|
||||
},
|
||||
{
|
||||
"checksumSHA1": "8fD/im5Kwvy3JgmxulDTambmE8w=",
|
||||
"path": "golang.org/x/sys/unix",
|
||||
|
|
Reference in a new issue