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eo/src/paradisEO/comm/messages/from/eoHeaderMessFrom.h

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+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+// "eoHeaderMessFrom.h"
+
+// (c) OPAC Team, LIFL, 2002
+
+/* This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+   
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+   
+   Contact: cahon@lifl.fr
+*/
+
+#ifndef eoHeaderMessFrom_h
+#define eoHeaderMessFrom_h
+
+#include <string>
+#include <mpi.h>
+
+template <class EOT> class eoLocalListener ;
+
+/**
+   A header is an identifier for the kind of
+   message to be then received ...
+*/
+
+template <class EOT> class eoHeaderMessFrom : public string {
+  
+public :
+  
+  /**
+     Second constructor. On contrary, the header is
+     waited for and built from the local listener.
+     It comes before a message.
+  */
+  
+  eoHeaderMessFrom (eoLocalListener <EOT> & loc_listen) :
+    comm (MPI :: COMM_WORLD) {
+    
+    MPI :: Status stat ;
+    comm.Probe (loc_listen.number (), 0, stat) ; // Blocking
+    int len = stat.Get_count (MPI :: CHAR) ;
+    char buff [len] ; // Temp. buffer
+    comm.Recv (buff, len, MPI :: CHAR, loc_listen.number (), 0) ;
+    assign (buff) ;
+  }
+  
+private :
+  
+  MPI :: Comm & comm ; // Communicator
+  
+} ;
+
+#endif
+