gs_wait.cpp

Go to the documentation of this file.

/******************************************************************************/
/*                                                                            */
/*    gs_wait.cpp                                                             */
/*    source code that implements the function of                             */
/*    waiting for a GridSolve job to complete                                 */
/*                                                                            */
/*    Copyright (C)                                                           */
/*    Innovative Computing Laboratory (ICL)                                   */
/*    Univesity of Tennessee, Knoxville                                       */
/*                                                                            */
/*    Feburary 22, 2007                                                       */
/******************************************************************************/


#include <oct.h>
#include <stdio.h>
#include <stdlib.h>
#include "grpc.h"
#include "gs_oct.h"


DEFUN_DLD (gs_wait, args, nargout, "Octave client for GridSolve") {
    octave_value_list retvals;      //return value
    octave_value_list bad_retval;   //bad return value
    grpc_function_handle_t *handle; //GridRPC function handle
    grpc_error_t status;            //GridRPC status/error code
    grpc_sessionid_t req_id;        //GridRPC non-blocking call session id


    //meaningless return value for error condition
    //or those calls that do not make grpc function call
    for (int i = 0; i < nargout; i++) {
        bad_retval(i) = Matrix(0, 0);
    }

    //number of input arguments
    int nargin = args.length();

    if (nargin <= 0) {
        fprintf(stderr, "No input service name found. Aborted.\n");
        return bad_retval;
    }

    if (nargin > 1) {
        fprintf(stderr, "Exactly one argument (session id) is expected. Aborted.\n");
        return bad_retval;
    }

    //otherwise, the input is correct

    //initialize the GridSolve environment
    status = grpc_initialize(NULL);
    if (status != GRPC_NO_ERROR && status != GRPC_ALREADY_INITIALIZED) {
        fprintf(stderr, "%s\n", grpc_error_string(status));
        return bad_retval;
    }
        
    req_id = args(0).int_value();

    //get the GRPC handle
    status = grpc_get_handle(&handle, req_id);
    if (status != GRPC_NO_ERROR) {
        fprintf(stderr, "Failed to get the GRPC handle. Aborted.\n");
        return bad_retval;
    }

    status = grpc_wait(req_id);
    if (status != GRPC_NO_ERROR) {
        fprintf(stderr, "%s\n", grpc_error_string(status));
        return bad_retval;
    }

    //the job completed

    retvals = octave_value_list();

    //convert object back
    if (convert_output_objects(handle->problem_desc, retvals) < 0) {
        fprintf(stderr, "Failed to convert output arguments. Aborted.\n");
        grpc_function_handle_destruct(handle);
        if (handle != NULL) free(handle);
        grpc_finalize();
        return bad_retval;
    }

    //finalize and clean up
    grpc_function_handle_destruct(handle);
    if (handle != NULL) free(handle);
    grpc_finalize();

    return retvals;
}