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+/*
+ * iperf, Copyright (c) 2014, The Regents of the University of
+ * California, through Lawrence Berkeley National Laboratory (subject
+ * to receipt of any required approvals from the U.S. Dept. of
+ * Energy).  All rights reserved.
+ *
+ * If you have questions about your rights to use or distribute this
+ * software, please contact Berkeley Lab's Technology Transfer
+ * Department at TTD@lbl.gov.
+ *
+ * NOTICE.  This software is owned by the U.S. Department of Energy.
+ * As such, the U.S. Government has been granted for itself and others
+ * acting on its behalf a paid-up, nonexclusive, irrevocable,
+ * worldwide license in the Software to reproduce, prepare derivative
+ * works, and perform publicly and display publicly.  Beginning five
+ * (5) years after the date permission to assert copyright is obtained
+ * from the U.S. Department of Energy, and subject to any subsequent
+ * five (5) year renewals, the U.S. Government is granted for itself
+ * and others acting on its behalf a paid-up, nonexclusive,
+ * irrevocable, worldwide license in the Software to reproduce,
+ * prepare derivative works, distribute copies to the public, perform
+ * publicly and display publicly, and to permit others to do so.
+ *
+ * This code is distributed under a BSD style license, see the LICENSE
+ * file for complete information.
+ *
+ * Based on timers.h by Jef Poskanzer. Used with permission.
+ */
+
+#ifndef __TIMER_H
+#define __TIMER_H
+
+#include <time.h>
+#include <sys/time.h>
+
+#include "iperf_time.h"
+
+/* TimerClientData is an opaque value that tags along with a timer.  The
+** client can use it for whatever, and it gets passed to the callback when
+** the timer triggers.
+*/
+typedef union
+{
+    void* p;
+    int i;
+    long l;
+} TimerClientData;
+
+extern TimerClientData JunkClientData;	/* for use when you don't care */
+
+/* The TimerProc gets called when the timer expires.  It gets passed
+** the TimerClientData associated with the timer, and a iperf_time in case
+** it wants to schedule another timer.
+*/
+typedef void TimerProc( TimerClientData client_data, struct iperf_time* nowP );
+
+/* The Timer struct. */
+typedef struct TimerStruct
+{
+    TimerProc* timer_proc;
+    TimerClientData client_data;
+    int64_t usecs;
+    int periodic;
+    struct iperf_time time;
+    struct TimerStruct* prev;
+    struct TimerStruct* next;
+    int hash;
+} Timer;
+
+/* Set up a timer, either periodic or one-shot. Returns (Timer*) 0 on errors. */
+extern Timer* tmr_create(
+    struct iperf_time* nowP, TimerProc* timer_proc, TimerClientData client_data,
+    int64_t usecs, int periodic );
+
+/* Returns a timeout indicating how long until the next timer triggers.  You
+** can just put the call to this routine right in your select().  Returns
+** (struct timeval*) 0 if no timers are pending.
+*/
+extern struct timeval* tmr_timeout( struct iperf_time* nowP ) /* __attribute__((hot)) */;
+
+/* Run the list of timers. Your main program needs to call this every so often,
+** or as indicated by tmr_timeout().
+*/
+extern void tmr_run( struct iperf_time* nowP ) /* __attribute__((hot)) */;
+
+/* Reset the clock on a timer, to current time plus the original timeout. */
+extern void tmr_reset( struct iperf_time* nowP, Timer* timer );
+
+/* Deschedule a timer.  Note that non-periodic timers are automatically
+** descheduled when they run, so you don't have to call this on them.
+*/
+extern void tmr_cancel( Timer* timer );
+
+/* Clean up the timers package, freeing any unused storage. */
+extern void tmr_cleanup( void );
+
+/* Cancel all timers and free storage, usually in preparation for exiting. */
+extern void tmr_destroy( void );
+
+#endif /* __TIMER_H */