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/* Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <signal.h>
#include <tap/basic.h>
#include "knot/server/dthreads.h"
#include "contrib/spinlock.h"
#define THREADS 8
#define CYCLES 100000
static volatile int counter = 0;
static volatile int tens_counter = 0;
static knot_spin_t spinlock;
static int thread(struct dthread *thread)
{
volatile int i, j, k;
for (i = 0; i < CYCLES; i++) {
knot_spin_lock(&spinlock);
j = counter;
k = tens_counter;
if (++j % 10 == 0) {
k++;
}
tens_counter = k;
counter = j;
knot_spin_unlock(&spinlock);
}
return 0;
}
// Signal handler
static void interrupt_handle(int s)
{
}
int main(int argc, char *argv[])
{
plan_lazy();
// Register service and signal handler
struct sigaction sa;
sa.sa_handler = interrupt_handle;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGALRM, &sa, NULL); // Interrupt
knot_spin_init(&spinlock);
dt_unit_t *unit = dt_create(THREADS, thread, NULL, NULL);
dt_start(unit);
dt_join(unit);
dt_delete(&unit);
knot_spin_destroy(&spinlock);
is_int(THREADS * CYCLES, counter, "spinlock: protected counter one");
is_int(THREADS * CYCLES / 10, tens_counter, "spinlock: protected counter two");
return 0;
}
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