From c6712ee2b29a9cb861e34102c5a3a9d43ffaba28 Mon Sep 17 00:00:00 2001
From: Zhao Zhili <zhilizhao@tencent.com>
Date: Wed, 4 Sep 2024 21:50:56 +0800
Subject: [PATCH] make try_initialize_global_cpu_info thread safe

---
 src/cpu.cpp | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/src/cpu.cpp b/src/cpu.cpp
index f9e64a1cc75b..b6a3e37913ee 100644
--- a/src/cpu.cpp
+++ b/src/cpu.cpp
@@ -1932,15 +1932,10 @@ static void initialize_global_cpu_info()
 #endif // defined __ANDROID__ || defined __linux__
 }
 
-static int g_cpu_info_initialized = 0;
-
 static inline void try_initialize_global_cpu_info()
 {
-    if (!g_cpu_info_initialized)
-    {
-        initialize_global_cpu_info();
-        g_cpu_info_initialized = 1;
-    }
+    static ncnn::OnceFlag flag = OnceFlagInit;
+    ncnn::CallOnce(flag, &initialize_global_cpu_info);
 }
 
 namespace ncnn {