Refactor

vendor/github.com/yudai/umutex/LICENSE

@@ -1,21 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) 2015 Iwasaki Yudai
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.

vendor/github.com/yudai/umutex/README.md

@@ -1,53 +0,0 @@
-# Unblocking Mutex
-
-This simple package provides unblocking mutexes for those who don't want to write many `select` clauses or get confused by numerous channels.
-
-## Usage Example
-
-```go
-package main
-
-import (
-	"fmt"
-	"github.com/yudai/umutex"
-)
-
-func main() {
-	// Create mutex
-	mutex := umutex.New()
-
-	// First time, try should succeed
-	if mutex.TryLock() {
-		fmt.Println("SUCCESS")
-	} else {
-		fmt.Println("FAILURE")
-	}
-
-	// Second time, try should fail as it's locked
-	if mutex.TryLock() {
-		fmt.Println("SUCCESS")
-	} else {
-		fmt.Println("FAILURE")
-	}
-
-	// Unclock mutex
-	mutex.Unlock()
-
-	// Third time, try should succeed again
-	if mutex.TryLock() {
-		fmt.Println("SUCCESS")
-	} else {
-		fmt.Println("FAILURE")
-	}
-}
-```
-
-The output is;
-
-```sh
-SUCCESS
-FAILURE
-SUCCESS
-```
-
-`ForceLock()` method is also availale for normal blocking lock.

vendor/github.com/yudai/umutex/umutex.go

@@ -1,38 +0,0 @@
-// Package umutex provides unblocking mutex
-package umutex
-
-// UnblockingMutex represents an unblocking mutex.
-type UnblockingMutex struct {
-	// Raw channel
-	C chan bool
-}
-
-// New returnes a new unblocking mutex instance.
-func New() *UnblockingMutex {
-	return &UnblockingMutex{
-		C: make(chan bool, 1),
-	}
-}
-
-// TryLock tries to lock the mutex.
-// When the mutex is free at the time, the function locks the mutex and return
-// true. Otherwise false will be returned. In the both cases, this function
-// doens't block and return the result immediately.
-func (m UnblockingMutex) TryLock() (result bool) {
-	select {
-	case m.C <- true:
-		return true
-	default:
-		return false
-	}
-}
-
-// Unlock unclocks the mutex.
-func (m UnblockingMutex) Unlock() {
-	<-m.C
-}
-
-// ForceLock surely locks the mutex, however, this function blocks when the mutex is locked at the time.
-func (m UnblockingMutex) ForceLock() {
-	m.C <- false
-}