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Implements the tickless OS

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This commit is contained in:
Gregory Nutt 2014-08-07 11:39:16 -06:00
parent c275ebef35
commit f140e112e0
3 changed files with 47 additions and 88 deletions
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1
arch/Kconfig
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@ -59,6 +59,7 @@ config ARCH_SH
config ARCH_SIM
bool "Simulation"
select ARCH_HAVE_TICKLESS
---help---
Linux/Cywgin user-mode simulation.

2
arch/sim/src/up_idle.c
View File

@ -1,5 +1,5 @@
/****************************************************************************
* up_idle.c
* arch/sim/src/up_idle.c
*
* Copyright (C) 2007-2009, 2011-2012, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>

132
arch/sim/src/up_tickless.c
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@ -1,5 +1,5 @@
/****************************************************************************
* arch/sim/up_tickless.c
* arch/sim/src/up_tickless.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
@ -41,13 +41,11 @@
*
* void up_timer_initialize(void): Initializes the timer facilities. Called
* early in the intialization sequence (by up_intialize()).
* int up_timer_gettime(FAR struct timespec *tp): Returns the current
* int up_timer_gettime(FAR struct timespec *ts): Returns the current
* time from the platform specific time source.
* int up_timer_cancel(void): Cancels the interval timer.
* int up_timer_start(FAR const struct timespec *tp): Start (or re-starts)
* int up_timer_start(FAR const struct timespec *ts): Start (or re-starts)
* the interval timer.
* int up_timer_resolution(FAR struct timespec *tp): Returns the
* resolution of the interval timer.
*
* The RTOS will provide the following interfaces for use by the platform-
* specific interval timer implementation:
@ -138,17 +136,21 @@ void up_timer_initialize(void)
*
* Description:
* Return the elapsed time since power-up (or, more correctly, since
* up_timer_initialize() was called). This function is functionally equivalent
* to:
* up_timer_initialize() was called). This function is functionally
* equivalent to:
*
* int clock_gettime(clockid_t clockid, FAR struct timespec *tp);
* int clock_gettime(clockid_t clockid, FAR struct timespec *ts);
*
* when clockid is CLOCK_MONOTONIC.
*
* This function provides the basis for reporting the current time and
* also is used to eliminate error build-up from small erros in interval
* time calculations.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* tp - Provides the location in which to return the up-time.
* ts - Provides the location in which to return the up-time.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
@ -162,10 +164,10 @@ void up_timer_initialize(void)
*
****************************************************************************/
int up_timer_gettime(FAR struct timespec *tp)
int up_timer_gettime(FAR struct timespec *ts)
{
tp->tv_sec = g_elapsed_time.tv_sec;
tp->tv_nsec = g_elapsed_time.tv_nsec;
ts->tv_sec = g_elapsed_time.tv_sec;
ts->tv_nsec = g_elapsed_time.tv_nsec;
return OK;
}
@ -173,12 +175,21 @@ int up_timer_gettime(FAR struct timespec *tp)
* Name: up_timer_cancel
*
* Description:
* Cancel the interval timer. up_timer_expiration() will not be called.
* Cancel the interval timer and return the time remaining on the timer.
* These two steps need to be as nearly atomic as possible.
* up_timer_expiration() will not be called unless the timer is restarted
* with up_timer_start().
*
* If, as a race condition, the timer has already expired when this
* function is called, then that pending interrupt must be cleared so
* that up_timer_start() and the remaining time of zero should be
* returned.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* None
* ts - Location to return the remaining time. Zero should be returned
* if the timer is not active.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
@ -192,8 +203,23 @@ int up_timer_gettime(FAR struct timespec *tp)
****************************************************************************/
#ifdef CONFIG_SCHED_TICKLESS
int up_timer_cancel(void)
int up_timer_cancel(FAR struct timespec *ts)
{
/* Return the time remaining on the simulated timer */
if (g_timer_active)
{
ts->tv_sec = g_interval_delay.tv_nsec;
ts->tv_nsec = g_interval_delay.tv_sec;
}
else
{
ts->tv_sec = 0;
ts->tv_nsec = 0;
}
/* Disable and reset the simulated timer */
g_interval_delay.tv_nsec = 0;
g_interval_delay.tv_sec = 0;
g_timer_active = false;
@ -211,7 +237,7 @@ int up_timer_cancel(void)
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* tp - Provides the time interval until up_timer_expiration() is called.
* ts - Provides the time interval until up_timer_expiration() is called.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
@ -225,82 +251,14 @@ int up_timer_cancel(void)
****************************************************************************/
#ifdef CONFIG_SCHED_TICKLESS
int up_timer_start(FAR const struct timespec *tp)
int up_timer_start(FAR const struct timespec *ts)
{
g_interval_delay.tv_nsec = tp->tv_nsec;
g_interval_delay.tv_sec = tp->tv_sec;
g_interval_delay.tv_nsec = ts->tv_nsec;
g_interval_delay.tv_sec = ts->tv_sec;
g_timer_active = true;
}
#endif
/****************************************************************************
* Name: up_timer_remaining
*
* Description:
* Return the time remaining until the next timer expiratino.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* tp - Location to return the remaining time. Zero should be returned
* if the timer is not active.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
* Assumptions:
* May be called from interrupt level handling or from the normal tasking
* level. Interrupts may need to be disabled internally to assure
* non-reentrancy.
*
****************************************************************************/
int up_timer_remaining(FAR struct timespec *tp)
{
if (g_timer_active)
{
tp->tv_sec = g_interval_delay.tv_nsec;
tp->tv_nsec = g_interval_delay.tv_sec;
}
else
{
tp->tv_sec = 0;
tp->tv_nsec = 0;
}
return OK;
}
/****************************************************************************
* Name: up_timer_resolution
*
* Description:
* Returns the resolution of the interval timer. This defines the minimal
* time separation between two events and is used for scheduling and for
* setting up timed events.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* tp - Provides the location in which to return the timer resolution.
*
* Returned Value:
*
* Assumptions:
* May be called from interrupt level handling or from the normal tasking
* level. Interrupts may need to be disabled internally to assure
* non-reentrancy.
*
****************************************************************************/
int up_timer_resolution(FAR struct timespec *tp)
{
tp->tv_sec = TICK_SEC;
tp->tv_nsec = TICK_NSEC;
return 0;
}
/****************************************************************************
* Name: up_timer_update
*