> > I have two processes P1 and P2 sharing a same > TFile: P1 regularely updates it > and P2 reads it when it is updated. > > How can P2 know that P1 has updated the TFile? > Windows NT system notifies the process by sending a special message when some file has been changed. The process may provide some action in turn. ( See: FindFirstChangeNotification / FindNextChangeNotification WIN32 API ) I guess there is an UNIX equivalent as well otherwise one has to watch things him/herself, for example via ROOT message mechanism. Valery
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