[lldb] Implement ModuleList::Swap

Author: augusto2112

lldb/include/lldb/Core/ModuleList.h

@@ -500,6 +500,9 @@ class ModuleList {
   bool AnyOf(
       std::function<bool(lldb_private::Module &module)> const &callback) const;
 
+  /// Atomically swaps the contents of this module list with \a other.
+  void Swap(ModuleList &other);
+
 protected:
   // Class typedefs.
   typedef std::vector<lldb::ModuleSP>

lldb/source/Core/ModuleList.cpp

@@ -1295,3 +1295,10 @@ bool ModuleList::AnyOf(
 
   return false;
 }
+
+
+void ModuleList::Swap(ModuleList &other) {
+  // scoped_lock locks both mutexes at once.
+  std::scoped_lock lock(m_modules_mutex, other.m_modules_mutex);
+  m_modules.swap(other.m_modules);
+}