llvmbot wrote:

<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-lldb

Author: Felipe de Azevedo Piovezan (felipepiovezan)

<details>
<summary>Changes</summary>

The UpdateRegisterContext method can be called from multiple threads.

---
Full diff: https://github.com/llvm/llvm-project/pull/134469.diff


2 Files Affected:

- (modified) 
lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.cpp (+2) 
- (modified) lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.h 
(+2) 


``````````diff
diff --git 
a/lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.cpp 
b/lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.cpp
index 75438550ce914..29927e3b5e4ed 100644
--- a/lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.cpp
+++ b/lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.cpp
@@ -25,6 +25,8 @@ RegisterContextThreadMemory::RegisterContextThreadMemory(
 RegisterContextThreadMemory::~RegisterContextThreadMemory() = default;
 
 void RegisterContextThreadMemory::UpdateRegisterContext() {
+  std::lock_guard<std::mutex> lock(m_update_register_ctx_lock);
+
   ThreadSP thread_sp(m_thread_wp.lock());
   if (thread_sp) {
     ProcessSP process_sp(thread_sp->GetProcess());
diff --git a/lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.h 
b/lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.h
index 23f675508cf38..1df32bbc1f057 100644
--- a/lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.h
+++ b/lldb/source/Plugins/Process/Utility/RegisterContextThreadMemory.h
@@ -99,6 +99,8 @@ class RegisterContextThreadMemory : public 
lldb_private::RegisterContext {
   RegisterContextThreadMemory(const RegisterContextThreadMemory &) = delete;
   const RegisterContextThreadMemory &
   operator=(const RegisterContextThreadMemory &) = delete;
+
+  std::mutex m_update_register_ctx_lock;
 };
 
 } // namespace lldb_private

``````````

</details>


https://github.com/llvm/llvm-project/pull/134469
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