From 4e744043a35eeb77da8125308b416abcc8668263 Mon Sep 17 00:00:00 2001
From: nxtstep <codewithadriaan@gmail.com>
Date: Fri, 16 Nov 2018 17:26:52 +0100
Subject: [PATCH] Make sure mutexes are being freed accordingly

---
 runtime/Swift/Sources/Antlr4/misc/utils/Mutex.swift | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/runtime/Swift/Sources/Antlr4/misc/utils/Mutex.swift b/runtime/Swift/Sources/Antlr4/misc/utils/Mutex.swift
index 70c3ab9df..5be0c28a8 100644
--- a/runtime/Swift/Sources/Antlr4/misc/utils/Mutex.swift
+++ b/runtime/Swift/Sources/Antlr4/misc/utils/Mutex.swift
@@ -35,4 +35,8 @@ class Mutex {
         return try closure()
     }
 
+    deinit {
+        // free the mutex resource
+        pthread_mutex_destroy(&mutex)
+    }
 }