Tests: Add a benchmark for the timer

tests/CMakeLists.txt

@@ -127,6 +127,10 @@ add_executable(check_securechannel check_securechannel.c $<TARGET_OBJECTS:open62
 target_link_libraries(check_securechannel ${LIBS})
 add_test_valgrind(securechannel ${TESTS_BINARY_DIR}/check_securechannel)
 
+add_executable(check_timer check_timer.c $<TARGET_OBJECTS:open62541-object> $<TARGET_OBJECTS:open62541-testplugins>)
+target_link_libraries(check_timer ${LIBS})
+add_test_valgrind(timer ${TESTS_BINARY_DIR}/check_timer)
+
 # Test Server
 
 add_executable(check_accesscontrol server/check_accesscontrol.c $<TARGET_OBJECTS:open62541-object> $<TARGET_OBJECTS:open62541-testplugins>)

tests/check_timer.c

@@ -0,0 +1,73 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public 
+ * License, v. 2.0. If a copy of the MPL was not distributed with this 
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ua_timer.h"
+#include "check.h"
+
+#include <time.h>
+#include <stdio.h>
+
+#define N_EVENTS 10000
+
+size_t count = 0;
+
+static void
+timerCallback(void *application, void *data) {
+    count++;
+}
+
+static void
+executionCallback(void *executionApplication, UA_ApplicationCallback cb,
+                  void *callbackApplication, void *data) {
+    cb(callbackApplication, data);
+}
+
+/* Create empty events with different callback intervals */
+static void
+createEvents(UA_Timer *t, UA_UInt32 events) {
+    for(size_t i = 0; i < events; i++) {
+        UA_Double interval = (UA_Double)i+1;
+        UA_StatusCode retval =
+            UA_Timer_addRepeatedCallback(t, timerCallback, NULL, NULL, interval, NULL);
+        ck_assert_int_eq(retval, UA_STATUSCODE_GOOD);
+    }
+}
+
+START_TEST(benchmarkTimer) {
+    UA_Timer timer;
+    UA_Timer_init(&timer);
+    createEvents(&timer, N_EVENTS);
+
+    clock_t begin = clock();
+    UA_DateTime now = 0;
+    for(size_t i = 0; i < 1000; i++) {
+        UA_DateTime next = UA_Timer_process(&timer, now, executionCallback, NULL);
+        /* At least 100 msec distance between _process */
+        now = next + (UA_DATETIME_MSEC * 100);
+        if(next > now)
+            now = next;
+    }
+
+    clock_t finish = clock();
+    double time_spent = (double)(finish - begin) / CLOCKS_PER_SEC;
+    printf("duration was %f s\n", time_spent);
+    printf("%lu callbacks\n", count);
+
+    UA_Timer_deleteMembers(&timer);
+} END_TEST
+
+int main(void) {
+    Suite *s  = suite_create("Test Event Timer");
+    TCase *tc = tcase_create("test cases");
+    tcase_add_test(tc, benchmarkTimer);
+    suite_add_tcase(s, tc);
+
+    SRunner *sr = srunner_create(s);
+    srunner_set_fork_status(sr, CK_NOFORK);
+    srunner_run_all (sr, CK_NORMAL);
+    int number_failed = srunner_ntests_failed(sr);
+    srunner_free(sr);
+
+    return (number_failed == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
+}