+// 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)
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{
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
}