1 files changed, 18 insertions, 0 deletions
diff --git a/vcl/unx/source/app/salinst.cxx b/vcl/unx/source/app/salinst.cxx
index 49a9cceb8617..88af0b70ef7e 100644
--- a/vcl/unx/source/app/salinst.cxx
+++ b/vcl/unx/source/app/salinst.cxx
@@ -259,6 +259,24 @@ void X11SalInstance::AcquireYieldMutex( ULONG nCount )
     }
 }
 
+// -----------------------------------------------------------------------
+
+bool X11SalInstance::CheckYieldMutex()
+{
+    bool bRet = true;
+
+    SalYieldMutex* pYieldMutex = mpSalYieldMutex;
+    if ( pYieldMutex->GetThreadId() !=
+         vos::OThread::getCurrentIdentifier() )
+    {
+        bRet = false;
+    }
+
+    return bRet;
+}
+
+// -----------------------------------------------------------------------
+
 void X11SalInstance::Yield( bool bWait, bool bHandleAllCurrentEvents )
 { GetX11SalData()->GetLib()->Yield( bWait, bHandleAllCurrentEvents ); }