Don't allow two threads to create/use the section list before it has been fully populated.

<rdar://problem/16937203>

llvm-svn: 211043

1 files changed, 3 insertions, 0 deletions

diff --git a/lldb/source/Symbol/ObjectFile.cpp b/lldb/source/Symbol/ObjectFile.cpp
index 35a2ffa145b..962ae0083e8 100644
--- a/lldb/source/Symbol/ObjectFile.cpp
+++ b/lldb/source/Symbol/ObjectFile.cpp
@@ -605,7 +605,10 @@ ObjectFile::GetSectionList()
     {
         ModuleSP module_sp(GetModule());
         if (module_sp)
+        {
+            lldb_private::Mutex::Locker locker(module_sp->GetMutex());
             CreateSections(*module_sp->GetUnifiedSectionList());
+        }
     }
     return m_sections_ap.get();
 }