From 8820f6e922d3332d0fdd035b504897503d4cdf3a Mon Sep 17 00:00:00 2001
From: David Sherret <dsherret@users.noreply.github.com>
Date: Tue, 11 Apr 2023 18:10:51 -0400
Subject: fix(npm): do not "npm install" when npm specifier happens to match
 package.json entry (#18660)

---
 cli/util/mod.rs  |  1 +
 cli/util/sync.rs | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 cli/util/sync.rs

(limited to 'cli/util')

diff --git a/cli/util/mod.rs b/cli/util/mod.rs
index c3133cc10..61511679f 100644
--- a/cli/util/mod.rs
+++ b/cli/util/mod.rs
@@ -11,6 +11,7 @@ pub mod fs;
 pub mod logger;
 pub mod path;
 pub mod progress_bar;
+pub mod sync;
 pub mod text_encoding;
 pub mod time;
 pub mod unix;
diff --git a/cli/util/sync.rs b/cli/util/sync.rs
new file mode 100644
index 000000000..6d136abc1
--- /dev/null
+++ b/cli/util/sync.rs
@@ -0,0 +1,35 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+use std::sync::atomic::AtomicBool;
+use std::sync::atomic::Ordering;
+
+/// Simplifies the use of an atomic boolean as a flag.
+#[derive(Debug, Default)]
+pub struct AtomicFlag(AtomicBool);
+
+impl AtomicFlag {
+  /// Raises the flag returning if the raise was successful.
+  pub fn raise(&self) -> bool {
+    !self.0.swap(true, Ordering::SeqCst)
+  }
+
+  /// Gets if the flag is raised.
+  pub fn is_raised(&self) -> bool {
+    self.0.load(Ordering::SeqCst)
+  }
+}
+
+#[cfg(test)]
+mod test {
+  use super::AtomicFlag;
+
+  #[test]
+  fn atomic_flag_raises() {
+    let flag = AtomicFlag::default();
+    assert!(!flag.is_raised()); // false by default
+    assert!(flag.raise());
+    assert!(flag.is_raised());
+    assert!(!flag.raise());
+    assert!(flag.is_raised());
+  }
+}
-- 
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