From 6f2f11c3fb1bae29fc5edf3eab0cc02e2f285b7c Mon Sep 17 00:00:00 2001
From: Nathanne Isip <nathanneisip@gmail.com>
Date: Fri, 27 Sep 2024 03:47:55 +0800
Subject: [PATCH] Improved implementation of the visit() function for parallel
 expression.

---
 src/ast/expression/ParallelExpression.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/ast/expression/ParallelExpression.cpp b/src/ast/expression/ParallelExpression.cpp
index d1ec71e..a3b998d 100644
--- a/src/ast/expression/ParallelExpression.cpp
+++ b/src/ast/expression/ParallelExpression.cpp
@@ -22,13 +22,21 @@
 
 #include <functional>
 #include <memory>
+#include <mutex>
 #include <thread>
 
 DynamicObject ParallelExpression::visit(SymbolTable& symbols) {
     std::thread task(
-        [this, expr = std::move(this->expression), sym = &symbols]() mutable {
+        std::bind([
+            this,
+            expr = std::move(this->expression),
+            sym = &symbols
+        ]() mutable {
+            std::mutex mtx;
+            std::scoped_lock<std::mutex> lock(mtx);
+
             expr->visit(*sym);
-        }
+        })
     );
 
     symbols.addParallelism(std::move(task));