MGR: If LOCKFILE doesn't already exist, core client isn't running so skip further testing

svn path=/trunk/boinc/; revision=18420

checkin_notes

@@ -5666,3 +5666,11 @@ David  14 June 2009
 
     html/user/
         forum_get_data.php
+
+Charlie 14 June 2009
+    - MGR: If LOCKFILE doesn't already exist, core client isn't running so skip 
+        further testing.  This avoids a very rare possible race condition and is 
+        more efficient.
+
+    clientgui/
+        BOINCClientManager.cpp

clientgui/BOINCClientManager.cpp

@@ -144,11 +144,13 @@ bool CBOINCClientManager::IsBOINCCoreRunning() {
     static FILE_LOCK file_lock;
     
     sprintf(path, "%s/%s", (char *)wxGetApp().GetDataDirectory().char_str(), LOCK_FILE_NAME);
+    if (boinc_file_exists(path) {   // If there is no lock file, core is not running
         if (file_lock.lock(path)) {
             running = true;
         } else {
             file_lock.unlock(path);
         }
+    }
 #endif
     wxLogTrace(wxT("Function Status"), wxT("CBOINCClientManager::IsBOINCCoreRunning - Returning '%d'"), (int)running);
     wxLogTrace(wxT("Function Start/End"), wxT("CBOINCClientManager::IsBOINCCoreRunning - Function End"));