A src/util/timer.c

@@ -0,0 +1,67 @@ 
+/**************************************************************************
+*
+* Copyright (C) 2009 Andreas.Fink (Andreas.Fink85@gmail.com)
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License version 2
+* as published by the Free Software Foundation.
+*
+* 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, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+**************************************************************************/
+
+#include <sys/timerfd.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "timer.h"
+
+GSList* timer_list = 0;
+
+int install_timer(int value_sec, int value_nsec, int interval_sec, int interval_nsec, void (*_callback)())
+{
+	if ( value_sec < 0 || interval_sec < 0 )
+		return -1;
+
+	int timer_fd;
+	struct itimerspec timer;
+	timer.it_value = (struct timespec){ .tv_sec=value_sec, .tv_nsec=value_nsec };
+	timer.it_interval = (struct timespec){ .tv_sec=interval_sec, .tv_nsec=interval_nsec };
+	timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
+	timerfd_settime(timer_fd, 0, &timer, 0);
+	struct timer* t = malloc(sizeof(struct timer));
+	t->id=timer_fd;
+	t->_callback = _callback;
+	timer_list = g_slist_prepend(timer_list, t);
+	return timer_fd;
+}
+
+
+void reset_timer(int id, int value_sec, int value_nsec, int interval_sec, int interval_nsec)
+{
+	struct itimerspec timer;
+	timer.it_value = (struct timespec){ .tv_sec=value_sec, .tv_nsec=value_nsec };
+	timer.it_interval = (struct timespec){ .tv_sec=interval_sec, .tv_nsec=interval_nsec };
+	timerfd_settime(id, 0, &timer, 0);
+}
+
+
+void uninstall_timer(int id)
+{
+	close(id);
+	GSList* timer_iter = timer_list;
+	while (timer_iter) {
+		struct timer* t = timer_iter->data;
+		if (t->id == id) {
+			timer_list = g_slist_remove(timer_list, t);
+			free(t);
+			return;
+		}
+		timer_iter = timer_iter->next;
+	}
+}

A src/util/timer.h

@@ -0,0 +1,48 @@ 
+/**************************************************************************
+*
+* Copyright (C) 2009 Andreas.Fink (Andreas.Fink85@gmail.com)
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License version 2
+* as published by the Free Software Foundation.
+*
+* 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, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+**************************************************************************/
+
+
+#ifndef TIMER_H
+#define TIMER_H
+
+#include <glib.h>
+
+extern GSList* timer_list;
+
+
+struct timer {
+	int id;
+	void (*_callback)();
+};
+
+
+// timer functions
+/** installs a timer with the first timeout 'value_sec' and then a periodic timeout with interval_sec
+	* '_callback' is the callback function when the timer reaches the timeout.
+	* If 'value_sec' == 0 then the timer is disabled (but not uninstalled)
+	* If 'interval_sec' == 0 the timer is a single shot timer, ie. no periodic timeout occur
+	* returns the 'id' of the timer, which is needed for uninstalling the timer **/
+int install_timer(int value_sec, int value_nsec, int interval_sec, int interval_nsec, void (*_callback)());
+
+/** resets a timer to the new values. If 'id' does not exist nothing happens.
+	* If value_sec == 0 the timer is stopped **/
+void reset_timer(int id, int value_sec, int value_nsec, int interval_sec, int interval_nsec);
+
+/** uninstalls a timer with the given 'id'. If no timer is installed with this id nothing happens **/
+void uninstall_timer(int id);
+
+#endif // TIMER_H