eccodes/examples/C/bufr_pthreads.c

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/*
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* Copyright 2005-2017 ECMWF.
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*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
*
* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <pthread.h>
#include "eccodes.h"
#define NUM_THREADS 3
/*static int DBL_EQUAL(double d1, double d2, double tolerance)
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{
return fabs(d1-d2) <= tolerance;
}*/
static void* process_bufr(void* arg)
{
FILE* fin = (FILE*)arg;
int err = 0;
codes_handle* h = NULL;
long numSubsets = 0;
size_t size = 0, i=0;
double* dValues = NULL;
/* Each thread gets a different message handle */
h = codes_handle_new_from_file(NULL, fin, PRODUCT_BUFR, &err);
assert(h);
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CODES_CHECK(codes_get_long(h,"numberOfSubsets", &numSubsets),0);
/*printf("numberOfSubsets=%ld\n", numSubsets);*/
assert( numSubsets == 1 ); /* Specific test for this BUFR file */
CODES_CHECK(codes_set_long(h, "unpack", 1),0);
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dValues = (double*)malloc(numSubsets*sizeof(double));
assert(dValues);
size = numSubsets;
CODES_CHECK(codes_get_double_array(h, "latitude", dValues, &size), 0);
for(i=0; i<size; ++i) {
/*printf("lat[%lu]=%g\n", i, dValues[i]);*/
/* Specific test for latitudes in this BUFR file */
assert( dValues[0] < 79 && dValues[0] > 70 );
}
free(dValues);
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pthread_exit(NULL);
}
int main(int argc, char** argv)
{
pthread_t thread1, thread2, thread3;
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int err = 0;
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FILE* fin = 0;
codes_handle* h1 = 0;
codes_handle* h2 = 0;
fin = fopen("../../data/bufr/syno_multi.bufr", "r");
assert(fin);
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err = pthread_create(&thread1, NULL, process_bufr, (void *)fin);
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assert(!err);
err = pthread_create(&thread2, NULL, process_bufr, (void *)fin);
assert(!err);
err = pthread_create(&thread3, NULL, process_bufr, (void *)fin);
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assert(!err);
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pthread_join(thread1, NULL);
pthread_join(thread2, NULL);
pthread_join(thread3, NULL);
fclose(fin);
codes_handle_delete(h1);
codes_handle_delete(h2);
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return 0;
}