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[client] added 1ms delay loop for incoming polling support

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Geoffrey McRae 2017-12-06 17:33:52 +11:00
parent c26842cb60
commit a1f574ff2f
4 changed files with 96 additions and 0 deletions
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1
client/Makefile
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@ -13,6 +13,7 @@ BUILD ?= .build
BIN ?= bin
OBJS = main.o \
delay.o \
spice/spice.o \
ivshmem/ivshmem.o \
renderers/basic.o \

70
client/delay.c Normal file
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@ -0,0 +1,70 @@
/*
Looking Glass - KVM FrameRelay (KVMFR) Client
Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
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., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "delay.h"
#include <SDL2/SDL.h>
#include "debug.h"
static unsigned int delay_loop_count = 0;
void delay()
{
unsigned char j;
for(unsigned int i = 0; i < delay_loop_count; ++i)
{
j = 0;
while(--j)
asm("");
}
}
void delay_calibrate()
{
// initialize the poll limit to a sane value
for(int start = SDL_GetTicks(); SDL_GetTicks() - start < 10; ++delay_loop_count) {}
DEBUG_INFO("Init : %u", delay_loop_count);
// the following loop must produce 20 concurrent valid results to ensure a valid calculation
int okCount = 0;
while(okCount < 20)
{
// time the final loop and calculate the remaining time
unsigned int ticks = SDL_GetTicks();
delay();
int remain = 10 - (SDL_GetTicks() - ticks);
// if the remaining time is within 2ms, accept it (Linux is not a RTOS)
if (remain > -2 && remain < 2)
{
++okCount;
continue;
}
// the delay is out of spec, adjust the limit
okCount = 0;
DEBUG_INFO("Diff : %c%d ms", remain > 0 ? '-' : '+', abs(remain));
delay_loop_count += ceil(((double)delay_loop_count / 10.0) * remain);
}
DEBUG_INFO("Final: %u", delay_loop_count);
// scale the limit for a 1ms delay
delay_loop_count = ceil((double)delay_loop_count / 10.0);
}

22
client/delay.h Normal file
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@ -0,0 +1,22 @@
/*
Looking Glass - KVM FrameRelay (KVMFR) Client
Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
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., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#pragma once
void delay_calibrate();
void delay();

3
client/main.c
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@ -34,6 +34,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
#include <GL/glu.h>
#include "debug.h"
#include "delay.h"
#include "memcpySSE.h"
#include "KVMFR.h"
#include "ivshmem/ivshmem.h"
@ -641,6 +642,8 @@ int run()
state.scaleX = 1.0f;
state.scaleY = 1.0f;
delay_calibrate();
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
DEBUG_ERROR("SDL_Init Failed");