check_counter.c

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/*
 * check_counter.c - Check that Counter objects work
 *
 * This is a test program for checking Counter objects. It creates some
 * threads that get many counts and check that they are increasing.
 */

#include <limits.h>

#ifndef THREADS
#define THREADS 16
#endif

#ifndef PER_THREAD
#define PER_THREAD (1000)
#endif

#include "gwlib/gwlib.h"

static void check(void *arg) {
    Counter *c;
    long i, this, prev;
    
    c = arg;
    prev = -1;
    for (i = 0; i < PER_THREAD; ++i) {
        this = counter_increase(c);
        if (this < 0)
            panic(0, "counter returned negative");
        if (this < prev)
            panic(0, "counter returned smaller than previous");
        prev = this;
    }
}


int main(void) {
    Counter *c;
    long threads[THREADS];
    long i;
    
    gwlib_init();
    log_set_output_level(GW_INFO);
    c = counter_create();
    for (i = 0; i < THREADS; ++i)
        threads[i] = gwthread_create(check, c);
    for (i = 0; i < THREADS; ++i)
        gwthread_join(threads[i]);
    
    return 0;
}