1 files changed, 78 insertions, 0 deletions
diff --git a/tests/contrib/test_spinlock.c b/tests/contrib/test_spinlock.c
new file mode 100644
index 0000000..0d5122b
--- /dev/null
+++ b/tests/contrib/test_spinlock.c
@@ -0,0 +1,78 @@
+/*  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;
+}