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unix: simplify atomic op in uv_tty_reset_mode() (#3773)

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Compare-and-exchange is only useful in a loop. Replace it with a simple
exchange.
This commit is contained in:
Ben Noordhuis 2022-10-01 13:43:47 +02:00 committed by GitHub
parent cdbba74d7a
commit 71a782b641
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1 changed files with 1 additions and 3 deletions
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src/unix/tty.c
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@ -447,13 +447,11 @@ uv_handle_type uv_guess_handle(uv_file file) {
*/ */
int uv_tty_reset_mode(void) { int uv_tty_reset_mode(void) {
int saved_errno; int saved_errno;
int expected;
int err; int err;
saved_errno = errno; saved_errno = errno;
expected = 0; if (atomic_exchange(&termios_spinlock, 1))
if (!atomic_compare_exchange_strong(&termios_spinlock, &expected, 1))
return UV_EBUSY; /* In uv_tty_set_mode(). */ return UV_EBUSY; /* In uv_tty_set_mode(). */
err = 0; err = 0;