From f54e1ddea12343991b402abf28be2b94ffbac2c5 Mon Sep 17 00:00:00 2001 From: Tian Tao Date: Tue, 11 Jul 2023 08:42:56 +0800 Subject: [PATCH] Optimizing __random for single-threaded scenarios The __random function does not need to be locked by __libc_lock_lock and unlocked by __libc_lock_unlock in a single-threaded scenario, so we can remove these locks in a single-threaded scenario to improve performance. Signed-off-by: Tian Tao --- stdlib/random.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/stdlib/random.c b/stdlib/random.c index 62f22fac8d..9035df8d18 100644 --- a/stdlib/random.c +++ b/stdlib/random.c @@ -288,11 +288,19 @@ __random (void) { int32_t retval; - __libc_lock_lock (lock); + if (__libc_single_threaded) { - (void) __random_r (&unsafe_state, &retval); + (void) __random_r (&unsafe_state, &retval); - __libc_lock_unlock (lock); + } else { + + __libc_lock_lock (lock); + + (void) __random_r (&unsafe_state, &retval); + + __libc_lock_unlock (lock); + + } return retval; } -- 2.33.0