/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *  (C) 2003 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"

/*
static char MTEST_Descrip[] = "Test of send cancel (failure) calls";
*/

int main( int argc, char *argv[] )
{
    int errs = 0;
    int rank, size, source, dest;
    MPI_Comm      comm;
    MPI_Status    status;
    MPI_Request   req;
    static int bufsizes[4] = { 1, 100, 10000, 1000000 };
    char *buf;
    int  cs, flag, n;

    MTest_Init( &argc, &argv );

    comm = MPI_COMM_WORLD;
    MPI_Comm_rank( comm, &rank );
    MPI_Comm_size( comm, &size );

    source = 0;
    dest   = size - 1;

    MTestPrintfMsg( 1, "Starting scancel test\n" );

    for (cs=0; cs<4; cs++) {
	n = bufsizes[cs];
	buf = (char *)malloc( n );
	if (!buf) {
	    fprintf( stderr, "Unable to allocate %d bytes\n", n );
	    MPI_Abort( MPI_COMM_WORLD, 1 );
            exit(1);
	}

	if (rank == source) {
	    MTestPrintfMsg( 1, "(%d) About to create isend and cancel\n",cs );
	    MPI_Isend( buf, n, MPI_CHAR, dest, cs+n+1, comm, &req );
	    MPI_Barrier( comm );
	    MPI_Cancel( &req );
	    MPI_Wait( &req, &status );
	    MTestPrintfMsg( 1, "Completed wait on isend\n" );
	    MPI_Test_cancelled( &status, &flag );
	    if (flag) {
		errs ++;
		printf( "Cancelled a matched Isend request (msg size = %d)!\n",
			n );
		fflush(stdout);
	    }
	    else
	    {
		n = 0;
	    }
	    /* Send the size, zero for not cancelled (success) */
	    MPI_Send( &n, 1, MPI_INT, dest, 123, comm );
	}
	else if (rank == dest)
	{
	    MPI_Recv( buf, n, MPI_CHAR, source, cs+n+1, comm, &status );
	    MPI_Barrier( comm );
	    MPI_Recv( &n, 1, MPI_INT, source, 123, comm, &status );
	}
	else {
	    MPI_Barrier( comm );
	}

	MPI_Barrier( comm );
	free( buf );
    }

    MTest_Finalize( errs );
    MPI_Finalize();
    return 0;
}
