From 9cdc3aab3eae55be30003cb486f290f3ee3df3a8 Mon Sep 17 00:00:00 2001
From: Paul Kirth <paulkirth@google.com>
Date: Mon, 14 Apr 2025 17:27:03 -0700
Subject: [PATCH] [clang-doc] Use SmartMutex when visiting the AST (#135514)

The SmartMutex will allow us to have a cheap mutex implementation when
using the Standalone executor, since it's single threaded. Performance
should be about the same for AllTUs executor.
---
 clang-tools-extra/clang-doc/Mapper.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/clang-tools-extra/clang-doc/Mapper.cpp b/clang-tools-extra/clang-doc/Mapper.cpp
index 6c90db03424c..022e3b12d82b 100644
--- a/clang-tools-extra/clang-doc/Mapper.cpp
+++ b/clang-tools-extra/clang-doc/Mapper.cpp
@@ -19,7 +19,7 @@ namespace clang {
 namespace doc {
 
 static llvm::StringSet<> USRVisited;
-static llvm::sys::Mutex USRVisitedGuard;
+static llvm::sys::SmartMutex<true> USRVisitedGuard;
 
 template <typename T> bool isTypedefAnonRecord(const T *D) {
   if (const auto *C = dyn_cast<CXXRecordDecl>(D)) {
@@ -48,7 +48,7 @@ bool MapASTVisitor::mapDecl(const T *D, bool IsDefinition) {
     return true;
   // Prevent Visiting USR twice
   {
-    std::lock_guard<llvm::sys::Mutex> Guard(USRVisitedGuard);
+    llvm::sys::SmartScopedLock<true> Guard(USRVisitedGuard);
     StringRef Visited = USR.str();
     if (USRVisited.count(Visited) && !isTypedefAnonRecord<T>(D))
       return true;