Ticket #3335: once.hpp.patch

boost/thread/pthread/once.hpp

@@ -58 +58 @@
                 if(flag.epoch==uninitialized_flag)
                 {
                     flag.epoch=being_initialized;
+#ifndef BOOST_NO_EXCEPTIONS
                     try
+#endif
                     {
                         pthread::pthread_mutex_scoped_unlock relocker(&detail::once_epoch_mutex);
                         f();
                     }
+#ifndef BOOST_NO_EXCEPTIONS
                     catch(...)
                     {
                         flag.epoch=uninitialized_flag;
                         BOOST_VERIFY(!pthread_cond_broadcast(&detail::once_epoch_cv));
                         throw;
                     }
+#endif
                     flag.epoch=--detail::once_global_epoch;
                     BOOST_VERIFY(!pthread_cond_broadcast(&detail::once_epoch_cv));
                 }