From 39aa10d82d6187d5cc33859b0bf8b96e5c7569e7 Mon Sep 17 00:00:00 2001
From: jzmaddock <jzmaddock@gmail.com>
Date: Wed, 31 Dec 2014 19:31:20 +0000
Subject: [PATCH] Fix for: https://github.com/boostorg/regex/pull/9

---
 src/fileiter.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/fileiter.cpp b/src/fileiter.cpp
index 780a12f1..5f65127f 100644
--- a/src/fileiter.cpp
+++ b/src/fileiter.cpp
@@ -267,14 +267,15 @@ void mapfile::lock(pointer* node)const
            read_size = std::fread(*node + sizeof(int), _size % buf_size, 1, hfile); 
         else
            read_size = std::fread(*node + sizeof(int), buf_size, 1, hfile);
-#ifndef BOOST_NO_EXCEPTIONS 
         if((read_size == 0) || (std::ferror(hfile)))
         { 
+#ifndef BOOST_NO_EXCEPTIONS 
+           unlock(node);
            throw std::runtime_error("Unable to read file."); 
-        } 
 #else 
-        BOOST_REGEX_NOEH_ASSERT((0 == std::ferror(hfile)) && (read_size != 0)); 
+           BOOST_REGEX_NOEH_ASSERT((0 == std::ferror(hfile)) && (read_size != 0)); 
 #endif 
+        } 
       }
       else
       {