1 files changed, 21 insertions, 0 deletions
diff --git a/src/cmd/internal/pathcache/lookpath.go b/src/cmd/internal/pathcache/lookpath.go
new file mode 100644
index 0000000000..5d1875af53
--- /dev/null
+++ b/src/cmd/internal/pathcache/lookpath.go
@@ -0,0 +1,21 @@
+// Copyright 2023 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.
+
+package pathcache
+
+import (
+	"cmd/internal/par"
+	"os/exec"
+)
+
+var lookPathCache par.ErrCache[string, string]
+
+// LookPath wraps exec.LookPath and caches the result
+// which can be called by multiple Goroutines at the same time.
+func LookPath(file string) (path string, err error) {
+	return lookPathCache.Do(file,
+		func() (string, error) {
+			return exec.LookPath(file)
+		})
+}