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From f54e1ddea12343991b402abf28be2b94ffbac2c5 Mon Sep 17 00:00:00 2001
From: Tian Tao <tiantao6@hisilicon.com>
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 <tiantao6@hisilicon.com>
---
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
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