fix: possible concurrent errors

.vscode/launch.json

@@ -0,0 +1,26 @@
+{
+    // 使用 IntelliSense 了解相关属性。 
+    // 悬停以查看现有属性的描述。
+    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+    {
+        "name": "Launch",
+        "type": "cppdbg",
+        "request": "launch",
+        "program": "${workspaceFolder}/build/simple-http-server",
+        "args": [],
+        "stopAtEntry": false,
+        "cwd": "${workspaceFolder}/build",
+        "environment": [
+            {
+                "name": "DYLD_FALLBACK_LIBRARY_PATH",
+                "value": "/usr/local/lib"
+            }
+        ],
+        "externalConsole": false,
+        "MIMode": "lldb",
+        "preLaunchTask": "Build Debug"
+    }
+    ]
+}

.vscode/tasks.json

@@ -0,0 +1,20 @@
+{
+    "tasks": [
+        {
+            "type": "shell",
+            "label": "Build Debug",
+            "command": "cmake -DCMAKE_BUILD_TYPE=Debug .. && make",
+            "options": {
+                "cwd": "${workspaceFolder}/build"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        }
+    ],
+    "version": "2.0.0"
+}