From 7a7746701df54decb4763ff2813bb9897a178ccf Mon Sep 17 00:00:00 2001
From: tobi <31960611+tsmethurst@users.noreply.github.com>
Date: Fri, 9 Feb 2024 12:38:51 +0100
Subject: [chore] Move `DoOnce` func wrapper to util (#2613)

---
 internal/util/sync.go | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 internal/util/sync.go

(limited to 'internal/util/sync.go')

diff --git a/internal/util/sync.go b/internal/util/sync.go
new file mode 100644
index 000000000..ea232fd56
--- /dev/null
+++ b/internal/util/sync.go
@@ -0,0 +1,29 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// 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 Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package util
+
+// DoOnce wraps a function to only perform it once.
+func DoOnce(fn func()) func() {
+	var once int32
+	return func() {
+		if once == 0 {
+			fn()
+			once = 1
+		}
+	}
+}
-- 
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