From 0b7f50a76cdf3febc95fd5d24c220f9f2b4063e7 Mon Sep 17 00:00:00 2001 From: CoprDistGit Date: Thu, 26 Oct 2023 07:13:04 +0000 Subject: automatic import of glibc --- ...ng-__random-for-single-threaded-scenarios.patch | 44 ++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 0001-Optimizing-__random-for-single-threaded-scenarios.patch (limited to '0001-Optimizing-__random-for-single-threaded-scenarios.patch') diff --git a/0001-Optimizing-__random-for-single-threaded-scenarios.patch b/0001-Optimizing-__random-for-single-threaded-scenarios.patch new file mode 100644 index 0000000..cbc113e --- /dev/null +++ b/0001-Optimizing-__random-for-single-threaded-scenarios.patch @@ -0,0 +1,44 @@ +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 + -- cgit v1.2.3