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diff --git a/pceplib/pcep_timer_internals.h b/pceplib/pcep_timer_internals.h
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+/*
+ * 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 General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * Author : Brady Johnson <brady@voltanet.io>
+ *
+ */
+
+/*
+ *  Timer definitions to be used internally by the pcep_timers library.
+ */
+
+#ifndef PCEPTIMERINTERNALS_H_
+#define PCEPTIMERINTERNALS_H_
+
+#include <stdint.h>
+#include <pthread.h>
+
+#include "pcep_utils_ordered_list.h"
+
+/* Function pointer to be called when timers expire.
+ * Parameters:
+ *    void *data - passed into create_timer
+ *    int timer_id - the timer_id returned by create_timer
+ */
+typedef void (*timer_expire_handler)(void *, int);
+
+/* Function pointer when an external timer infrastructure is used */
+typedef void (*ext_timer_create)(void *infra_data, void **timer, int seconds,
+				 void *data);
+typedef void (*ext_timer_cancel)(void **timer);
+typedef int (*ext_pthread_create_callback)(pthread_t *pthread_id,
+					   const pthread_attr_t *attr,
+					   void *(*start_routine)(void *),
+					   void *data, const char *thread_name);
+
+typedef struct pcep_timer_ {
+	time_t expire_time;
+	uint16_t sleep_seconds;
+	int timer_id;
+	void *data;
+	void *external_timer;
+
+} pcep_timer;
+
+typedef struct pcep_timers_context_ {
+	ordered_list_handle *timer_list;
+	bool active;
+	timer_expire_handler expire_handler;
+	pthread_t event_loop_thread;
+	pthread_mutex_t timer_list_lock;
+	void *external_timer_infra_data;
+	ext_timer_create timer_create_func;
+	ext_timer_cancel timer_cancel_func;
+
+} pcep_timers_context;
+
+/* functions implemented in pcep_timers_loop.c */
+void *event_loop(void *context);
+
+
+#endif /* PCEPTIMERINTERNALS_H_ */