mirror of https://github.com/ecmwf/eccodes.git
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/*
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* Copyright 2005-2017 ECMWF.
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*
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* This software is licensed under the terms of the Apache Licence Version 2.0
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* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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*
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* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <pthread.h>
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#include <string.h>
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#include <assert.h>
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#include "grib_api.h"
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#define NUM_THREADS 8
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#define FILES_PER_ITERATION 10
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char* INPUT_FILE = NULL;
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void do_stuff(void *data);
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/* Structure for passing data to threads */
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struct v
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{
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int number;
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//char *data; /* column */
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};
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void *runner(void *ptr); /* the thread function */
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int main(int argc, char **argv)
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{
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int i;
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int thread_counter = 0;
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pthread_t workers[NUM_THREADS];
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INPUT_FILE = argv[1];
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/* We have to create M * N worker threads */
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for (i = 0; i < NUM_THREADS; i++) {
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struct v *data = (struct v *) malloc(sizeof(struct v));
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data->number = i;
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//data->data = NULL;
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/* Now we will create the thread passing it data as a paramater*/
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pthread_create(&workers[thread_counter], NULL, runner, data);
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thread_counter++;
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}
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/* Waiting for threads to complete */
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for (i = 0; i < NUM_THREADS; i++)
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{
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pthread_join(workers[i], NULL);
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}
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return 0;
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}
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void *runner(void *ptr)
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{
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do_stuff(ptr);
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pthread_exit(0);
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}
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int encode_file(char *template_file, char *output_file)
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{
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FILE *in = NULL;
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FILE *out = NULL;
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grib_handle *source_handle = NULL;
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const void *buffer = NULL;
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int err = 0;
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in = fopen(template_file,"r"); assert(in);
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out = fopen(output_file,"w"); assert(out);
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while ((source_handle = grib_handle_new_from_file(0, in, &err))!=NULL)
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{
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size_t size=0, values_len=0;
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int i;
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double *values = NULL;
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long count;
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double d,e;
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grib_handle *clone_handle = grib_handle_clone(source_handle);
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assert(clone_handle);
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GRIB_CHECK(grib_get_size(clone_handle, "values", &values_len),0);
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values = (double*)malloc(values_len*sizeof(double));
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d=10e-8;
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e=d;
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count=1;
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for (i=0;i<values_len;i++) {
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if (count>100) {e*=10; count=1;}
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values[i]=d;
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d+=e;
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count++;
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}
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GRIB_CHECK(grib_set_long(clone_handle,"bitsPerValue",16),0);
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GRIB_CHECK(grib_set_double_array(clone_handle,"values",values,values_len),0);
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/* get the coded message in a buffer */
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GRIB_CHECK(grib_get_message(clone_handle,&buffer,&size),0);
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/* write the buffer to a file */
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if(fwrite(buffer,1,size,out) != size) {
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perror(output_file);
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return 1;
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}
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grib_handle_delete(clone_handle);
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grib_handle_delete(source_handle);
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free(values);
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}
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fclose(out);
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fclose(in);
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return 0;
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}
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void do_stuff(void *ptr)
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{
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/* Casting paramater to struct v pointer */
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struct v *data = ptr;
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char output_file[50];
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for (int i=0; i<FILES_PER_ITERATION;i++) {
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sprintf(output_file,"temp.grib_encode_pthreads.out_%d-%d.grib",data->number,i);
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encode_file(INPUT_FILE,output_file);
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}
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}
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