From 71a782b64125b2dc1d9ecdf62aec934df55c53be Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Sat, 1 Oct 2022 13:43:47 +0200
Subject: [PATCH] unix: simplify atomic op in uv_tty_reset_mode() (#3773)

Compare-and-exchange is only useful in a loop. Replace it with a simple
exchange.
---
 src/unix/tty.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/unix/tty.c b/src/unix/tty.c
index a5bad72f..4c220e56 100644
--- a/src/unix/tty.c
+++ b/src/unix/tty.c
@@ -447,13 +447,11 @@ uv_handle_type uv_guess_handle(uv_file file) {
  */
 int uv_tty_reset_mode(void) {
   int saved_errno;
-  int expected;
   int err;
 
   saved_errno = errno;
 
-  expected = 0;
-  if (!atomic_compare_exchange_strong(&termios_spinlock, &expected, 1))
+  if (atomic_exchange(&termios_spinlock, 1))
     return UV_EBUSY;  /* In uv_tty_set_mode(). */
 
   err = 0;