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/* Copyright (C) 2023 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 "contrib/atomic.h"
#include "knot/server/dthreads.h"
#define THREADS 16
#define CYCLES1 100000
#define CYCLES2 2000000
#define UPPER 0xffffffff00000000
#define LOWER 0x00000000ffffffff
static volatile knot_atomic_uint64_t counter_add = 0;
static volatile knot_atomic_uint64_t counter_sub = 0;
static volatile knot_atomic_uint64_t atomic_var;
static int errors_set_get = 0;
static int thread_add(struct dthread *thread)
{
for (int i = 0; i < CYCLES1; i++) {
ATOMIC_ADD(counter_add, 7);
ATOMIC_SUB(counter_sub, 7);
}
return 0;
}
static int thread_set(struct dthread *thread)
{
u_int64_t val = (dt_get_id(thread) % 2) ? UPPER : LOWER;
for (int i = 0; i < CYCLES2; i++) {
ATOMIC_SET(atomic_var, val);
volatile u_int64_t read = ATOMIC_GET(atomic_var);
if (read != UPPER && read != LOWER) {
// Non-atomic counter, won't be accurate!
// However, it's sufficient for fault detection.
errors_set_get++;
}
}
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
// Test for atomicity of ATOMIC_ADD and ATOMIC_SUB.
dt_unit_t *unit = dt_create(THREADS, thread_add, NULL, NULL);
dt_start(unit);
dt_join(unit);
dt_delete(&unit);
is_int(THREADS * CYCLES1 * 7, counter_add, "atomicity of ATOMIC_ADD");
is_int(THREADS * CYCLES1 * 7, -counter_sub, "atomicity of ATOMIC_SUB");
// Test for atomicity of ATOMIC_SET and ATOMIC_GET.
unit = dt_create(THREADS, thread_set, NULL, NULL);
dt_start(unit);
dt_join(unit);
dt_delete(&unit);
is_int(0, errors_set_get, "atomicity of ATOMIC_SET / ATOMIC_GET");
return 0;
}
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