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First preview release.
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Poul-Henning Kamp
178
time_sim.c
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178
time_sim.c
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/*-
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* Copyright (c) 2014 Poul-Henning Kamp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Simulated timebase
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* ==================
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*
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* Very simple minded: Time advances when TB_Sleep() is called only.
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*
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*/
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include "ntimed.h"
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static struct timestamp st_now;
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static double freq = 0;
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static double freq0 = 0;
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static double adj_offset = 0;
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static double adj_duration = 0;
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static double adj_freq = 0;
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/*
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* This variable is public and represent the amount of time the simulated
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* clock has been tweaked by the TB_Step() and TB_Adjust() functions.
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*
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* This can be used to "(re-)model" previously recorded event series
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* onto the ST timebase.
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*/
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double Time_Sim_delta = 0;
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/**********************************************************************/
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static struct timestamp *
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st_Now(struct timestamp *storage)
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{
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if (storage == NULL)
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ALLOC_OBJ(storage, TIMESTAMP_MAGIC);
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AN(storage);
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*storage = st_now;
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return (storage);
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}
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/**********************************************************************/
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static void
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st_Sleep(double dur)
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{
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TS_Add(&st_now, dur);
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Time_Sim_delta += dur * freq;
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}
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/**********************************************************************/
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static void __match_proto__(tb_step_f)
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st_Step(struct ocx *ocx, double offset)
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{
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Debug(ocx, "SIMSTEP %.3e\n", offset);
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Time_Sim_delta += offset;
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TB_generation++;
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}
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/**********************************************************************/
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static void __match_proto__(tb_adjust_f)
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st_Adjust(struct ocx *ocx, double offset, double duration, double frequency)
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{
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(void)ocx;
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adj_offset = offset;
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adj_duration = floor(duration);
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if (adj_offset > 0.0 && adj_duration == 0.0)
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adj_duration = 1.0;
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adj_freq = frequency;
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}
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/**********************************************************************/
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static enum todo_e __match_proto__(todo_f)
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st_kern_pll(struct ocx *ocx, struct todolist *tdl, void *priv)
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{
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double d;
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(void)ocx;
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AN(tdl);
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AZ(priv);
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freq = freq0 + adj_freq;
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if (adj_duration > 0.0) {
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d = adj_offset / adj_duration;
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freq += d;
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adj_offset -= d;
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adj_duration -= 1.0;
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}
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Put(ocx, OCX_TRACE, "SIMPLL %.3e %.3e %.3e\n",
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adj_freq, adj_offset, adj_duration);
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return (TODO_OK);
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}
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/**********************************************************************
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* Mechanism to artificially bump simulated clock around.
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*/
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struct st_bump {
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unsigned magic;
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#define ST_BUMP_MAGIC 0xc8981be3
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double bfreq;
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double bphase;
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};
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static enum todo_e __match_proto__(todo_f)
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st_kern_bump(struct ocx *ocx, struct todolist *tdl, void *priv)
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{
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struct st_bump *stb;
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(void)ocx;
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(void)tdl;
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CAST_OBJ_NOTNULL(stb, priv, ST_BUMP_MAGIC);
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freq0 += stb->bfreq;
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Time_Sim_delta += stb->bphase;
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FREE_OBJ(stb);
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return (TODO_OK);
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}
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void
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Time_Sim_Bump(struct todolist *tdl, double when, double bfreq, double bphase)
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{
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struct st_bump *stb;
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ALLOC_OBJ(stb, ST_BUMP_MAGIC);
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AN(stb);
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stb->bfreq = bfreq;
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stb->bphase = bphase;
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(void)TODO_ScheduleRel(tdl, st_kern_bump, stb, when, 0.0, "BUMP");
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}
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/**********************************************************************/
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void
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Time_Sim(struct todolist *tdl)
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{
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INIT_OBJ(&st_now, TIMESTAMP_MAGIC);
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TS_Add(&st_now, 1e6);
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TB_Now = st_Now;
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TB_Sleep = st_Sleep;
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TB_Step = st_Step;
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TB_Adjust = st_Adjust;
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(void)TODO_ScheduleRel(tdl, st_kern_pll, NULL, 0.0, 1.0, "SIMPLL");
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}
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