split 'libosmocore' from openbsc codebase

This library is intended to collect all generic/common funcitionality
of all Osmocom.org projects, including OpenBSC but also OsmocomBB

The library currently includes the following modules:

bitvec, comp128, gsm_utils, msgb, select, signal, statistics, talloc, timer,
tlv_parse, linuxlist

msgb allocation error debugging had to be temporarily disabled as it depends on
'debug.c' functionality which at the moment remains in OpenBSC

libosmocore/include/osmocore/timer.h

@@ -0,0 +1,72 @@
+/*
+ * (C) 2008, 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * All Rights Reserved
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef TIMER_H
+#define TIMER_H
+
+#include <sys/time.h>
+
+#include "linuxlist.h"
+
+/**
+ * Timer management:
+ *      - Create a struct timer_list
+ *      - Fill out timeout and use add_timer or
+ *        use schedule_timer to schedule a timer in
+ *        x seconds and microseconds from now...
+ *      - Use del_timer to remove the timer
+ *
+ *  Internally:
+ *      - We hook into select.c to give a timeval of the
+ *        nearest timer. On already passed timers we give
+ *        it a 0 to immediately fire after the select
+ *      - update_timers will call the callbacks and remove
+ *        the timers.
+ *
+ */
+struct timer_list {
+	struct llist_head entry;
+	struct timeval timeout;
+	unsigned int active  : 1;
+	unsigned int handled : 1;
+	unsigned int in_list : 1;
+
+	void (*cb)(void*);
+	void *data;
+};
+
+/**
+ * timer management
+ */
+void bsc_add_timer(struct timer_list *timer);
+void bsc_schedule_timer(struct timer_list *timer, int seconds, int microseconds);
+void bsc_del_timer(struct timer_list *timer);
+int bsc_timer_pending(struct timer_list *timer);
+
+
+/**
+ * internal timer list management
+ */
+struct timeval *bsc_nearest_timer();
+void bsc_prepare_timers();
+int bsc_update_timers();
+int bsc_timer_check(void);
+
+#endif