+++ /dev/null
-/* This file is part of the Linux Trace Toolkit trace reading library
- * Copyright (C) 2003-2004 Michel Dagenais
- * 2005 Mathieu Desnoyers
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License Version 2.1 as published by the Free Software Foundation.
- *
- * 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 Lesser General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
-#ifndef LTT_TIME_H
-#define LTT_TIME_H
-
-#include <glib.h>
-#include <lttv/compiler.h>
-#include <math.h>
-
-typedef struct _LttTime {
- unsigned long tv_sec;
- unsigned long tv_nsec;
-} LttTime;
-
-
-#define NANOSECONDS_PER_SECOND 1000000000
-
-/* We give the DIV and MUL constants so we can always multiply, for a
- * division as well as a multiplication of NANOSECONDS_PER_SECOND */
-/* 2^30/1.07374182400631629848 = 1000000000.0 */
-#define DOUBLE_SHIFT_CONST_DIV 1.07374182400631629848
-#define DOUBLE_SHIFT 30
-
-/* 2^30*0.93132257461547851562 = 1000000000.0000000000 */
-#define DOUBLE_SHIFT_CONST_MUL 0.93132257461547851562
-
-
-/* 1953125 * 2^9 = NANOSECONDS_PER_SECOND */
-#define LTT_TIME_UINT_SHIFT_CONST 1953125
-#define LTT_TIME_UINT_SHIFT 9
-
-
-static const LttTime ltt_time_zero = { 0, 0 };
-
-static const LttTime ltt_time_one = { 0, 1 };
-
-static const LttTime ltt_time_infinite = { G_MAXUINT, NANOSECONDS_PER_SECOND };
-
-static inline LttTime ltt_time_sub(LttTime t1, LttTime t2)
-{
- LttTime res;
- res.tv_sec = t1.tv_sec - t2.tv_sec;
- res.tv_nsec = t1.tv_nsec - t2.tv_nsec;
- /* unlikely : given equal chance to be anywhere in t1.tv_nsec, and
- * higher probability of low value for t2.tv_sec, we will habitually
- * not wrap.
- */
- if(unlikely(t1.tv_nsec < t2.tv_nsec)) {
- res.tv_sec--;
- res.tv_nsec += NANOSECONDS_PER_SECOND;
- }
- return res;
-}
-
-
-static inline LttTime ltt_time_add(LttTime t1, LttTime t2)
-{
- LttTime res;
- res.tv_nsec = t1.tv_nsec + t2.tv_nsec;
- res.tv_sec = t1.tv_sec + t2.tv_sec;
- /* unlikely : given equal chance to be anywhere in t1.tv_nsec, and
- * higher probability of low value for t2.tv_sec, we will habitually
- * not wrap.
- */
- if(unlikely(res.tv_nsec >= NANOSECONDS_PER_SECOND)) {
- res.tv_sec++;
- res.tv_nsec -= NANOSECONDS_PER_SECOND;
- }
- return res;
-}
-
-/* Fastest comparison : t1 > t2 */
-static inline int ltt_time_compare(LttTime t1, LttTime t2)
-{
- int ret=0;
- if(likely(t1.tv_sec > t2.tv_sec)) ret = 1;
- else if(unlikely(t1.tv_sec < t2.tv_sec)) ret = -1;
- else if(likely(t1.tv_nsec > t2.tv_nsec)) ret = 1;
- else if(unlikely(t1.tv_nsec < t2.tv_nsec)) ret = -1;
-
- return ret;
-}
-
-#define LTT_TIME_MIN(a,b) ((ltt_time_compare((a),(b)) < 0) ? (a) : (b))
-#define LTT_TIME_MAX(a,b) ((ltt_time_compare((a),(b)) > 0) ? (a) : (b))
-
-#define MAX_TV_SEC_TO_DOUBLE 0x7FFFFF
-static inline double ltt_time_to_double(LttTime t1)
-{
- /* We lose precision if tv_sec is > than (2^23)-1
- *
- * Max values that fits in a double (53 bits precision on normalised
- * mantissa):
- * tv_nsec : NANOSECONDS_PER_SECONDS : 2^30
- *
- * So we have 53-30 = 23 bits left for tv_sec.
- * */
-#ifdef EXTRA_CHECK
- g_assert(t1.tv_sec <= MAX_TV_SEC_TO_DOUBLE);
- if(t1.tv_sec > MAX_TV_SEC_TO_DOUBLE)
- g_warning("Precision loss in conversion LttTime to double");
-#endif //EXTRA_CHECK
- return ((double)((guint64)t1.tv_sec<<DOUBLE_SHIFT)
- * (double)DOUBLE_SHIFT_CONST_MUL)
- + (double)t1.tv_nsec;
-}
-
-
-static inline LttTime ltt_time_from_double(double t1)
-{
- /* We lose precision if tv_sec is > than (2^23)-1
- *
- * Max values that fits in a double (53 bits precision on normalised
- * mantissa):
- * tv_nsec : NANOSECONDS_PER_SECONDS : 2^30
- *
- * So we have 53-30 = 23 bits left for tv_sec.
- * */
-#ifdef EXTRA_CHECK
- g_assert(t1 <= MAX_TV_SEC_TO_DOUBLE);
- if(t1 > MAX_TV_SEC_TO_DOUBLE)
- g_warning("Conversion from non precise double to LttTime");
-#endif //EXTRA_CHECK
- LttTime res;
- //res.tv_sec = t1/(double)NANOSECONDS_PER_SECOND;
- res.tv_sec = (guint64)(t1 * DOUBLE_SHIFT_CONST_DIV) >> DOUBLE_SHIFT;
- res.tv_nsec = (t1 - (((guint64)res.tv_sec<<LTT_TIME_UINT_SHIFT))
- * LTT_TIME_UINT_SHIFT_CONST);
- return res;
-}
-
-/* Use ltt_time_to_double and ltt_time_from_double to check for lack
- * of precision.
- */
-static inline LttTime ltt_time_mul(LttTime t1, double d)
-{
- LttTime res;
-
- double time_double = ltt_time_to_double(t1);
-
- time_double = time_double * d;
-
- res = ltt_time_from_double(time_double);
-
- return res;
-
-#if 0
- /* What is that ? (Mathieu) */
- if(f == 0.0){
- res.tv_sec = 0;
- res.tv_nsec = 0;
- }else{
- double d;
- d = 1.0/f;
- sec = t1.tv_sec / (double)d;
- res.tv_sec = sec;
- res.tv_nsec = t1.tv_nsec / (double)d + (sec - res.tv_sec) *
- NANOSECONDS_PER_SECOND;
- res.tv_sec += res.tv_nsec / NANOSECONDS_PER_SECOND;
- res.tv_nsec %= NANOSECONDS_PER_SECOND;
- }
- return res;
-#endif //0
-}
-
-
-/* Use ltt_time_to_double and ltt_time_from_double to check for lack
- * of precision.
- */
-static inline LttTime ltt_time_div(LttTime t1, double d)
-{
- LttTime res;
-
- double time_double = ltt_time_to_double(t1);
-
- time_double = time_double / d;
-
- res = ltt_time_from_double(time_double);
-
- return res;
-
-
-#if 0
- double sec;
- LttTime res;
-
- sec = t1.tv_sec / (double)f;
- res.tv_sec = sec;
- res.tv_nsec = t1.tv_nsec / (double)f + (sec - res.tv_sec) *
- NANOSECONDS_PER_SECOND;
- res.tv_sec += res.tv_nsec / NANOSECONDS_PER_SECOND;
- res.tv_nsec %= NANOSECONDS_PER_SECOND;
- return res;
-#endif //0
-}
-
-
-static inline guint64 ltt_time_to_uint64(LttTime t1)
-{
- return (((guint64)t1.tv_sec*LTT_TIME_UINT_SHIFT_CONST) << LTT_TIME_UINT_SHIFT)
- + (guint64)t1.tv_nsec;
-}
-
-
-#define MAX_TV_SEC_TO_UINT64 0x3FFFFFFFFFFFFFFFULL
-
-/* The likely branch is with sec != 0, because most events in a bloc
- * will be over 1s from the block start. (see tracefile.c)
- */
-static inline LttTime ltt_time_from_uint64(guint64 t1)
-{
- /* We lose precision if tv_sec is > than (2^62)-1
- * */
-#ifdef EXTRA_CHECK
- g_assert(t1 <= MAX_TV_SEC_TO_UINT64);
- if(t1 > MAX_TV_SEC_TO_UINT64)
- g_warning("Conversion from uint64 to non precise LttTime");
-#endif //EXTRA_CHECK
- LttTime res;
- //if(unlikely(t1 >= NANOSECONDS_PER_SECOND)) {
- if(likely(t1>>LTT_TIME_UINT_SHIFT >= LTT_TIME_UINT_SHIFT_CONST)) {
- //res.tv_sec = t1/NANOSECONDS_PER_SECOND;
- res.tv_sec = (t1>>LTT_TIME_UINT_SHIFT)
- /LTT_TIME_UINT_SHIFT_CONST; // acceleration
- res.tv_nsec = (t1 - res.tv_sec*NANOSECONDS_PER_SECOND);
- } else {
- res.tv_sec = 0;
- res.tv_nsec = (guint32)t1;
- }
- return res;
-}
-
-#endif // LTT_TIME_H
projects / lttv.git / blobdiff