1 files changed, 0 insertions, 59 deletions
diff --git a/libgo/go/cmd/go/internal/sumweb/cache.go b/libgo/go/cmd/go/internal/sumweb/cache.go
deleted file mode 100644
index a8117a71b78..00000000000
--- a/libgo/go/cmd/go/internal/sumweb/cache.go
+++ /dev/null
@@ -1,59 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Parallel cache.
-// This file is copied from cmd/go/internal/par.
-
-package sumweb
-
-import (
-	"sync"
-	"sync/atomic"
-)
-
-// parCache runs an action once per key and caches the result.
-type parCache struct {
-	m sync.Map
-}
-
-type cacheEntry struct {
-	done   uint32
-	mu     sync.Mutex
-	result interface{}
-}
-
-// Do calls the function f if and only if Do is being called for the first time with this key.
-// No call to Do with a given key returns until the one call to f returns.
-// Do returns the value returned by the one call to f.
-func (c *parCache) Do(key interface{}, f func() interface{}) interface{} {
-	entryIface, ok := c.m.Load(key)
-	if !ok {
-		entryIface, _ = c.m.LoadOrStore(key, new(cacheEntry))
-	}
-	e := entryIface.(*cacheEntry)
-	if atomic.LoadUint32(&e.done) == 0 {
-		e.mu.Lock()
-		if atomic.LoadUint32(&e.done) == 0 {
-			e.result = f()
-			atomic.StoreUint32(&e.done, 1)
-		}
-		e.mu.Unlock()
-	}
-	return e.result
-}
-
-// Get returns the cached result associated with key.
-// It returns nil if there is no such result.
-// If the result for key is being computed, Get does not wait for the computation to finish.
-func (c *parCache) Get(key interface{}) interface{} {
-	entryIface, ok := c.m.Load(key)
-	if !ok {
-		return nil
-	}
-	e := entryIface.(*cacheEntry)
-	if atomic.LoadUint32(&e.done) == 0 {
-		return nil
-	}
-	return e.result
-}