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Fix race condition in DefaultOnWidthChanged #198

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Fix race condition in DefaultOnWidthChanged #198

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4 changes: 4 additions & 0 deletions utils_unix.go
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
//go:build darwin || dragonfly || freebsd || (linux && !appengine) || netbsd || openbsd || solaris
// +build darwin dragonfly freebsd linux,!appengine netbsd openbsd solaris

package readline
Expand Down Expand Up @@ -60,11 +61,14 @@ func GetStdin() int {
// -----------------------------------------------------------------------------

var (
widthChangeMutex sync.Mutex
widthChange sync.Once
widthChangeCallback func()
)

func DefaultOnWidthChanged(f func()) {
widthChangeMutex.Lock()
defer widthChangeMutex.Unlock()
widthChangeCallback = f
widthChange.Do(func() {
ch := make(chan os.Signal, 1)
Expand Down