Prevent double-sends from quick double-button-clicks

git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@174 1a98c847-1fd6-4fd8-948a-caf3550aa51b

ui.cpp

@@ -1928,6 +1928,9 @@ void CSendDialog::OnButtonPaste(wxCommandEvent& event)
 }
 
 void CSendDialog::OnButtonSend(wxCommandEvent& event)
+{
+    static CCriticalSection cs_sendlock;
+    TRY_CRITICAL_BLOCK(cs_sendlock)
     {
         CWalletTx wtx;
         string strAddress = (string)m_textCtrlAddress->GetValue();
@@ -1993,6 +1996,7 @@ void CSendDialog::OnButtonSend(wxCommandEvent& event)
 
         EndModal(true);
     }
+}
 
 void CSendDialog::OnButtonCancel(wxCommandEvent& event)
 {