Add mutex for external source document meta-data container.

These get updated from reference parser code (ScAddress, ScRange etc)
which may be run from multiple threads.

Change-Id: I5a1aaa4b51d9b9fb032458eb5e89f0652887184e

1 files changed, 6 insertions, 2 deletions

diff --git a/sc/inc/externalrefmgr.hxx b/sc/inc/externalrefmgr.hxx
index c5a73aea8a7a..6156abb06ac4 100644
--- a/sc/inc/externalrefmgr.hxx
+++ b/sc/inc/externalrefmgr.hxx
@@ -793,8 +793,12 @@ private:
 
     NumFmtMap maNumFormatMap;
 
-    /** original source file index. */
-    ::std::vector<SrcFileData> maSrcFiles;
+    /**
+     * List of external source document meta-data, used to keep track of
+     * external document identifiers.
+     */
+    std::vector<SrcFileData> maSrcFiles;
+    mutable osl::Mutex maMtxSrcFiles;
 
     /** Status whether in reference marking state. See isInReferenceMarking(). */
     bool mbInReferenceMarking:1;