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threaded_main.cpp
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00004 //               Epetra: Linear Algebra Services Package 
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00041 
00042 
00043 // Petra_Comm Test routine
00044 
00045 #include <math.h>
00046 #include <unistd.h>
00047 #include <string.h>
00048 #include <ctype.h>
00049 #include <stdlib.h>
00050 #ifdef PETRA_MPI
00051 #include <mpi.h>
00052 #endif
00053 #include "Petra_Comm.h"
00054 #include "Petra_Time.h"
00055 
00056 int main(int argc, char *argv[]) {
00057 
00058   // Initialize MPI
00059 
00060   MPI_Init(&argc,&argv);
00061   int size, rank; // Number of MPI processes, My process ID
00062 
00063   MPI_Comm_size(MPI_COMM_WORLD, &size);
00064   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
00065   // I'm alive !!!
00066 
00067 
00068 
00069   Petra_Comm & petracomm = *new Petra_Comm( MPI_COMM_WORLD );
00070   int MyPID =  petracomm.MyPID();
00071   int NumProc =  petracomm.NumProc();
00072   cout << "Processor "<<MyPID<<" of " << NumProc << " is alive."<<endl;
00073 
00074   if (NumProc!=2) {
00075     cout << " This special routine only works for 2 processors " << endl;
00076     abort();
00077   }
00078 
00079 
00080   Petra_Comm * other_comm;
00081   MPI_Status status;
00082 
00083   unsigned int icomm = &petracomm;
00084 
00085   if (MyPID==1) cout << "Address of Petra_Comm object on PE 1 = " << &petracomm << endl;
00086 
00087   if (MyPID==0) MPI_Recv((void *) &other_comm, 1, MPI_UNSIGNED, 1, 99, MPI_COMM_WORLD, &status);
00088   else MPI_Send ( (void *) &icomm, 1, MPI_UNSIGNED, 0, 99, MPI_COMM_WORLD);
00089 
00090   if (MyPID==0) cout << "Address of other Petra_Comm object on PE 0 = " << other_comm << endl;
00091   
00092   int otherPID = other_comm->MyPID();
00093 
00094   if (MyPID==0) cout << "Processor "<<MyPID<<" of " << NumProc
00095          << " has a neighbor processor with ID "
00096          << otherPID << " of " << other_comm->NumProc() <<endl;
00097  
00098   delete &petracomm;
00099   MPI_Finalize();
00100 
00101   return 0;
00102 }
00103  
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