nuttx/arch/sim/src/up_idle.c

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/****************************************************************************
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* arch/sim/src/up_idle.c
*
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* Copyright (C) 2007-2009, 2011-2012, 2014, 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <pthread.h>
#include <time.h>
#include <nuttx/arch.h>
#ifdef CONFIG_PM
# include <nuttx/power/pm.h>
#endif
#ifdef CONFIG_SMP
# include <nuttx/spinlock.h>
#endif
#include "up_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define PM_IDLE_DOMAIN 0 /* Revisit */
/****************************************************************************
* Private Data
****************************************************************************/
#ifdef CONFIG_SIM_X11FB
static int g_x11refresh = 0;
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#if defined(CONFIG_SIM_WALLTIME) || defined(CONFIG_SIM_X11FB)
extern int up_hostusleep(unsigned int usec);
#ifdef CONFIG_SIM_X11FB
extern void up_x11update(void);
#endif
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_idle
*
* Description:
* up_idle() is the logic that will be executed when their
* is no other ready-to-run task. This is processor idle
* time and will continue until some interrupt occurs to
* cause a context switch from the idle task.
*
* Processing in this state may be processor-specific. e.g.,
* this is where power management operations might be
* performed.
*
****************************************************************************/
void up_idle(void)
{
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#ifdef CONFIG_SMP
/* In the SMP configuration, only one CPU should do these operations. It
* should not matter which, however.
*/
static volatile spinlock_t lock SP_SECTION = SP_UNLOCKED;
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/* The one that gets the lock is the one that executes the IDLE operations */
if (up_testset(&lock) != SP_UNLOCKED)
{
/* We didn't get it... Give other pthreads/CPUs a shot and try again
* later.
*/
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pthread_yield();
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return;
}
#endif
#ifdef CONFIG_SCHED_TICKLESS
/* Driver the simulated interval timer */
up_timer_update();
#else
/* If the system is idle, then process "fake" timer interrupts.
* Hopefully, something will wake up.
*/
sched_process_timer();
#endif
#if defined(CONFIG_DEV_CONSOLE) && !defined(CONFIG_SIM_UART_DATAPOST)
/* Handle UART data availability */
if (g_uart_data_available)
{
g_uart_data_available = 0;
simuart_post();
}
#endif
#if defined(CONFIG_NET_ETHERNET) && defined(CONFIG_SIM_NETDEV)
/* Run the network if enabled */
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netdriver_loop();
#endif
#ifdef CONFIG_PM
/* Fake some power management stuff for testing purposes */
{
static enum pm_state_e state = PM_NORMAL;
enum pm_state_e newstate;
newstate = pm_checkstate(PM_IDLE_DOMAIN);
if (newstate != state)
{
if (pm_changestate(PM_IDLE_DOMAIN, newstate) == OK)
{
state = newstate;
}
}
}
#endif
#if defined(CONFIG_SIM_WALLTIME) || defined(CONFIG_SIM_X11FB)
/* Wait a bit so that the sched_process_timer() is called close to the
* correct rate.
*/
(void)up_hostusleep(1000000 / CLK_TCK);
/* Handle X11-related events */
#ifdef CONFIG_SIM_X11FB
if (g_x11initialized)
{
#if defined(CONFIG_SIM_TOUCHSCREEN) || defined(CONFIG_SIM_AJOYSTICK)
/* Drive the X11 event loop */
if (g_eventloop)
{
up_x11events();
}
#endif
/* Update the display periodically */
g_x11refresh += 1000000 / CLK_TCK;
if (g_x11refresh > 500000)
{
up_x11update();
}
}
#endif
#endif
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#ifdef CONFIG_SMP
/* Release the spinlock */
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lock = SP_UNLOCKED;
/* Give other pthreads/CPUs a shot */
pthread_yield();
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#endif
}