Download link for 2.6.2 release

[goredo.git] / tgt.go

diff --git a/tgt.go b/tgt.go
index 3fa14a0cb142b67d403a437dd87e7f42b727c100..a8525ed426aa2aa374959b18a8ca3a1e507f2753 100644 (file)
--- a/tgt.go
+++ b/tgt.go
@@ -1,11 +1,30 @@
+// goredo -- djb's redo implementation on pure Go
+// Copyright (C) 2020-2024 Sergey Matveev <stargrave@stargrave.org>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 3 of the License.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 package main
 
 import (
        "path"
        "path/filepath"
+       "sync"
 )
 
-var TgtCache = make(map[string]*Tgt)
+var (
+       TgtCache  = make(map[string]*Tgt)
+       TgtCacheM sync.RWMutex
+)
 
 func mustAbs(pth string) string {
        pth, err := filepath.Abs(pth)
@@ -43,10 +62,11 @@ type Tgt struct {
 
 func NewTgt(tgt string) *Tgt {
        a := mustAbs(tgt)
-       if TgtCache != nil {
-               if t := TgtCache[a]; t != nil {
-                       return t
-               }
+       TgtCacheM.RLock()
+       cached := TgtCache[a]
+       TgtCacheM.RUnlock()
+       if cached != nil {
+               return cached
        }
        h, t := pathSplit(a)
        res := Tgt{
@@ -54,9 +74,9 @@ func NewTgt(tgt string) *Tgt {
                rel: mustRel(Cwd, a),
                dep: path.Join(h, RedoDir, t+DepSuffix),
        }
-       if TgtCache != nil {
-               TgtCache[a] = &res
-       }
+       TgtCacheM.Lock()
+       TgtCache[a] = &res
+       TgtCacheM.Unlock()
        return &res
 }