Re: [Plplot-general] Plotting from multithreaded environment

[Arjen M. <Arj...@de...>]

Hi Sergei,



I took example x00 and turned it into a multithreaded version. It worked as you would expect - the picture is drawn correctly in the separate thread, no problems there. It would seem that there is more to it than "merely" a multithreaded environment.



Could you try this code and see what happens in your environment?



Regards,



Arjen

----
// Simple demo of a 2D line plot.
//
// Copyright (C) 2011  Alan W. Irwin
//
// This file is part of PLplot.
//
// PLplot is free software; you can redistribute it and/or modify
// it under the terms of the GNU Library General Public License as published
// by the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// PLplot 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 Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public License
// along with PLplot; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
//

#include <pthread.h>
#include "plcdemos.h"
#define NSIZE    101

typedef struct {
    PLFLT *x;
    PLFLT *y;
} thread_data;

void *thread_start( void *arg ) {

    thread_data *pdata = arg;
    plline( NSIZE, pdata->x, pdata->y );
    return NULL;
}

int
main( int argc, const char *argv[] )
{
    PLFLT x[NSIZE], y[NSIZE];
    PLFLT xmin = 0., xmax = 1., ymin = 0., ymax = 100.;
    int   i;

    pthread_t tid;
    thread_data data;
    void        *res;

    // Prepare data to be plotted.
    for ( i = 0; i < NSIZE; i++ )
    {
        x[i] = (PLFLT) ( i ) / (PLFLT) ( NSIZE - 1 );
        y[i] = ymax * x[i] * x[i];
    }

    // Parse and process command line arguments
    plparseopts( &argc, argv, PL_PARSE_FULL );

    // Initialize plplot
    plinit();

    // Create a labelled box to hold the plot.
    plenv( xmin, xmax, ymin, ymax, 0, 0 );
    pllab( "x", "y=100 x#u2#d", "Simple PLplot demo of a 2D line plot" );

    // Plot the data that was prepared above.
    data.x = x;
    data.y = y;

    pthread_create( &tid, NULL, thread_start, &data );
    //plline( NSIZE, x, y );

    // Close PLplot library
    pthread_join( tid, &res );

    plend();

    exit( 0 );
}



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