+++ /dev/null
-/*
-
- silctimer.h
-
- Author: Pekka Riikonen <priikone@silcnet.org>
-
- Copyright (C) 2007 Pekka Riikonen
-
- 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; version 2 of the License.
-
- 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.
-
-*/
-
-/****h* silcutil/SILC Timer Interface
- *
- * DESCRIPTION
- *
- * SILC Timer interface provides a simple way to measure time intervals.
- * The SILC Timer works with microsecond resolution, depending on platform.
- *
- * EXAMPLE
- *
- * SilcTimerStruct timer;
- *
- * silc_timer_start(&timer);
- * ... time passes ...
- * silc_timer_stop(&timer);
- * silc_timer_value(&timer, &elapsed_sec, &elapsed_usec);
- *
- ***/
-
-#ifndef SILCTIMER_H
-#define SILCTIMER_H
-
-/****s* silcutil/SilcTimerAPI/SilcTimer
- *
- * NAME
- *
- * typedef struct SilcTimerObject *SilcTimer, SilcTimerStruct;
- *
- * DESCRIPTION
- *
- * The timer context. The context is given as argument to all
- * silc_timer_* functions.
- *
- ***/
-typedef struct SilcTimerObject *SilcTimer, SilcTimerStruct;
-
-/****f* silcutil/SilcTimerAPI/silc_timer_start
- *
- * SYNOPSIS
- *
- * SilcBool silc_timer_start(SilcTimer timer);
- *
- * DESCRIPTION
- *
- * Starts the timer. If the timer is already running this will reset
- * the timer and continue.
- *
- * EXAMPLE
- *
- * SilcTimerStruct timer;
- *
- * silc_timer_start(&timer);
- * ... time passes ...
- * silc_timer_stop(&timer);
- * silc_timer_value(&timer, &elapsed_sec, &elapsed_usec);
- *
- ***/
-void silc_timer_start(SilcTimer timer);
-
-/****f* silcutil/SilcTimerAPI/silc_timer_stop
- *
- * SYNOPSIS
- *
- * void silc_timer_stop(SilcTimer timer);
- *
- * DESCRIPTION
- *
- * Stop the timer. The elapsed time can be retrieved by calling the
- * silc_timer_value function.
- *
- ***/
-void silc_timer_stop(SilcTimer timer);
-
-/****f* silcutil/SilcTimerAPI/silc_timer_continue
- *
- * SYNOPSIS
- *
- * void silc_timer_continue(SilcTimer timer);
- *
- * DESCRIPTION
- *
- * Continue stopped timer. If timer is running already this does nothing.
- *
- ***/
-void silc_timer_continue(SilcTimer timer);
-
-/****f* silcutil/SilcTimerAPI/silc_timer_value
- *
- * SYNOPSIS
- *
- * void silc_timer_value(SilcTimer timer,
- * SilcUInt64 *elapsed_time_seconds,
- * SilcUInt32 *elapsed_time_microseconds);
- *
- * DESCRIPTION
- *
- * Returns either the current value or the end value of the timer. If the
- * timer is currently running this returns the currently elapsed time. If
- * the timer is stopped this returns the cumulative elapsed time.
- *
- ***/
-void silc_timer_value(SilcTimer timer,
- SilcUInt64 *elapsed_time_seconds,
- SilcUInt32 *elapsed_time_microseconds);
-
-/****f* silcutil/SilcTimerAPI/silc_timer_value_time
- *
- * SYNOPSIS
- *
- * void silc_timer_value_time(SilcTimer timer, SilcTime ret_time);
- *
- * DESCRIPTION
- *
- * Same as silc_timer_value but returns the elapsed time to `ret_time'
- * SilcTime structure as absolute date and time. This is useful if the
- * returned time needs to be converted into some other format such as
- * time and date strings.
- *
- ***/
-void silc_timer_value_time(SilcTimer timer, SilcTime ret_time);
-
-/****f* silcutil/SilcTimerAPI/silc_timer_start_time
- *
- * SYNOPSIS
- *
- * void silc_timer_start_time(SilcTimer timer, SilcTime ret_start_time);
- *
- * DESCRIPTION
- *
- * Returns the timer's start time into `ret_start_time' SilcTime structure.
- *
- ***/
-void silc_timer_start_time(SilcTimer timer, SilcTime ret_start_time);
-
-/****f* silcutil/SilcTimerAPI/silc_timer_is_running
- *
- * SYNOPSIS
- *
- * SilcBool silc_timer_is_running(SilcTimer timer);
- *
- * DESCRIPTION
- *
- * Returns TRUE if the timer is currently running, FALSE otherwise.
- *
- ***/
-SilcBool silc_timer_is_running(SilcTimer timer);
-
-#include "silctimer_i.h"
-
-/****f* silcutil/SilcTimerAPI/silc_timer_tick
- *
- * SYNOPSIS
- *
- * SilcUInt64 silc_timer_tick(SilcTimer &timer, SilcBool adjust)
- *
- * DESCRIPTION
- *
- * Returns the current CPU tick count. You should call the
- * silc_timer_synchronize before using this function to make sure the
- * overhead of measuring the CPU tick count is not included in the
- * tick count. If the `adjust' is TRUE and the silc_timer_synchronize
- * has been called the returned value is adjusted to be more accurate.
- *
- * EXAMPLES
- *
- * // Synchronize timer for more accurate CPU tick counts
- * silc_timer_synchronize(&timer);
- * start = silc_timer_tick(&timer, FALSE);
- * do_something();
- * stop = silc_timer_tick(&timer, TRUE);
- *
- ***/
-
-static inline
-SilcUInt64 silc_timer_tick(SilcTimer timer, SilcBool adjust)
-{
-#if defined(__GNUC__) || defined(__ICC)
-#if defined(SILC_I486)
- SilcUInt64 x;
- asm volatile ("rdtsc" : "=A" (x));
- return adjust ? x - timer->sync_tdiff : x;
-
-#elif defined(SILC_X86_64)
- SilcUInt64 x;
- SilcUInt32 hi, lo;
- asm volatile ("rdtsc" : "=a" (lo), "=d" (hi));
- x = ((SilcUInt64)lo | ((SilcUInt64)hi << 32));
- return adjust ? x - timer->sync_tdiff : x;
-
-#elif defined(SILC_POWERPC)
- SilcUInt32 hi, lo, tmp;
- asm volatile ("0: \n\t"
- "mftbu %0 \n\t"
- "mftb %1 \n\t"
- "mftbu %2 \n\t"
- "cmpw %2,%0 \n\t"
- "bne 0b \n"
- : "=r" (hi), "=r" (lo), "=r" (tmp));
- x = ((SilcUInt64)lo | ((SilcUInt64)hi << 32));
- return adjust ? x - timer->sync_tdiff : x;
-#endif /* SILC_I486 */
-
-#elif defined(SILC_WIN32)
- __asm rdtsc
-
-#else
- return 0;
-#endif /* __GNUC__ || __ICC */
-}
-
-/****f* silcutil/SilcTimerAPI/silc_timer_synchronize
- *
- * SYNOPSIS
- *
- * void silc_timer_synchronize(SilcTimer timer);
- *
- * DESCRIPTION
- *
- * Synchronizes the `timer'. This call will attempt to synchronize the
- * timer for more accurate results with high resolution timing. Call
- * this before you start using the `timer'.
- *
- * EXAMPLE
- *
- * // Synchronize timer
- * silc_timer_synchronize(&timer);
- * silc_timer_start(&timer);
- * ... time passes ...
- * silc_timer_stop(&timer);
- * silc_timer_value(&timer, &elapsed_sec, &elapsed_usec);
- *
- ***/
-
-static inline
-void silc_timer_synchronize(SilcTimer timer)
-{
- SilcUInt32 tdiff, cumu, i;
- SilcUInt64 t1, t2;
-
- /* Sync normal timer */
- for (i = 0, cumu = 0; i < 5; i++) {
- silc_timer_start(timer);
- silc_timer_stop(timer);
- silc_timer_value(timer, NULL, &tdiff);
- cumu += (int)tdiff;
- }
-
- timer->sync_diff = cumu;
- if (timer->sync_diff > 5)
- timer->sync_diff /= 5;
-
- /* Sync CPU tick count */
- cumu = 0;
- t1 = silc_timer_tick(timer, FALSE);
- t2 = silc_timer_tick(timer, FALSE);
- cumu += (t2 - t1);
- t1 = silc_timer_tick(timer, FALSE);
- t2 = silc_timer_tick(timer, FALSE);
- cumu += (t2 - t1);
- t1 = silc_timer_tick(timer, FALSE);
- t2 = silc_timer_tick(timer, FALSE);
- cumu += (t2 - t1);
-
- timer->sync_tdiff = cumu / 3;
-
- t1 = silc_timer_tick(timer, FALSE);
- t2 = silc_timer_tick(timer, TRUE);
- timer->sync_tdiff += (int)(t2 - t1);
-}
-
-#endif /* SILCTIMER_H */
projects / crypto.git / blobdiff