From e6b5f8b941ca21bc3d6ff4667fbbd7fd553f76c8 Mon Sep 17 00:00:00 2001
From: hongweipeng <hongweichen8888@sina.com>
Date: Tue, 7 May 2024 15:21:22 +0800
Subject: [PATCH] Fix memory leak in TlsRandomNumberGenerator() constructor
 #2660

---
 sdk/src/common/random.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sdk/src/common/random.cc b/sdk/src/common/random.cc
index 77b88cfa2a..e1c4d818c9 100644
--- a/sdk/src/common/random.cc
+++ b/sdk/src/common/random.cc
@@ -7,6 +7,7 @@
 
 #include <cstring>
 #include <random>
+#include <mutex>
 
 OPENTELEMETRY_BEGIN_NAMESPACE
 namespace sdk
@@ -20,13 +21,16 @@ namespace common
 //     https://github.com/opentracing-contrib/nginx-opentracing/issues/52
 namespace
 {
+static std::once_flag once;
 class TlsRandomNumberGenerator
 {
 public:
   TlsRandomNumberGenerator() noexcept
   {
     Seed();
-    platform::AtFork(nullptr, nullptr, OnFork);
+    std::call_once(once, [](){
+      platform::AtFork(nullptr, nullptr, OnFork);
+    });
   }
 
   static FastRandomNumberGenerator &engine() noexcept { return engine_; }