Adding upstream version 8.4.4.upstream/8.4.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 110 insertions, 0 deletions

diff --git a/pceplib/pcep_timers_event_loop.c b/pceplib/pcep_timers_event_loop.c
new file mode 100644
index 0000000..8984496
--- /dev/null
+++ b/pceplib/pcep_timers_event_loop.c
@@ -0,0 +1,110 @@
+/*
+ * This file is part of the PCEPlib, a PCEP protocol library.
+ *
+ * Copyright (C) 2020 Volta Networks https://voltanet.io/
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * Author : Brady Johnson <brady@voltanet.io>
+ *
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <errno.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/select.h>
+
+#include "pcep_timers_event_loop.h"
+#include "pcep_timer_internals.h"
+#include "pcep_utils_ordered_list.h"
+#include "pcep_utils_logging.h"
+#include "pcep_utils_memory.h"
+
+/* For each expired timer: remove the timer from the list, call the
+ * expire_handler, and free the timer. */
+void walk_and_process_timers(pcep_timers_context *timers_context)
+{
+	pthread_mutex_lock(&timers_context->timer_list_lock);
+
+	bool keep_walking = true;
+	ordered_list_node *timer_node = timers_context->timer_list->head;
+	time_t now = time(NULL);
+	pcep_timer *timer_data;
+
+	/* the timers are sorted by expire_time, so we will only
+	 * remove the top node each time through the loop */
+	while (timer_node != NULL && keep_walking) {
+		timer_data = (pcep_timer *)timer_node->data;
+		if (timer_data->expire_time <= now) {
+			timer_node = timer_node->next_node;
+			ordered_list_remove_first_node(
+				timers_context->timer_list);
+			/* call the timer expired handler */
+			timers_context->expire_handler(timer_data->data,
+						       timer_data->timer_id);
+			pceplib_free(PCEPLIB_INFRA, timer_data);
+		} else {
+			keep_walking = false;
+		}
+	}
+
+	pthread_mutex_unlock(&timers_context->timer_list_lock);
+}
+
+
+/* pcep_timers::initialize() will create a thread and invoke this method */
+void *event_loop(void *context)
+{
+	if (context == NULL) {
+		pcep_log(
+			LOG_WARNING,
+			"%s: pcep_timers_event_loop cannot start event_loop with NULL data",
+			__func__);
+		return NULL;
+	}
+
+	pcep_log(LOG_NOTICE, "%s: [%ld-%ld] Starting timers_event_loop thread",
+		 __func__, time(NULL), pthread_self());
+
+	pcep_timers_context *timers_context = (pcep_timers_context *)context;
+	struct timeval timer;
+	int retval;
+
+	while (timers_context->active) {
+		/* check the timers every half second */
+		timer.tv_sec = 0;
+		timer.tv_usec = 500000;
+
+		do {
+			/* if the select() call gets interrupted, select() will
+			 * set the remaining time in timer, so we need to call
+			 * it again.
+			 */
+			retval = select(0, NULL, NULL, NULL, &timer);
+		} while (retval != 0 && errno == EINTR);
+
+		walk_and_process_timers(timers_context);
+	}
+
+	pcep_log(LOG_WARNING, "%s: [%ld-%ld] Finished timers_event_loop thread",
+		 __func__, time(NULL), pthread_self());
+
+	return NULL;
+}