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54adf5979c
In the current NuttX kernel implementation, there is no function
to represent pure scheduler ticks.
The existing clock_systime_ticks() cannot serve this purpose,
because it keeps increasing even when the scheduler is not running.
This happens since the returned value reflects real hardware time:
as long as the timer or alarm hardware is active,
clock_systime_ticks() will continuously increase.
This patch introduces two new functions that provide access to
scheduler ticks — a counter that only increases when the scheduler
itself is running.
Signed-off-by: Chengdong Wang wangchengdong@lixiang.com
100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/****************************************************************************
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* sched/clock/clock.h
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __SCHED_CLOCK_CLOCK_H
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#define __SCHED_CLOCK_CLOCK_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <nuttx/clock.h>
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#include <nuttx/compiler.h>
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#include <nuttx/spinlock_type.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* 32-bit mask for 64-bit timer values */
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#define TIMER_MASK32 0x00000000ffffffff
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/* Configuration ************************************************************/
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/* If CONFIG_SYSTEM_TIME64 is selected and the CPU supports long long types,
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* then a 64-bit system time will be used.
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*/
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#ifndef CONFIG_HAVE_LONG_LONG
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# undef CONFIG_SYSTEM_TIME64
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#endif
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#if !defined(__HAVE_KERNEL_GLOBALS)
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/* The system clock exists (CONFIG_SCHED_TICKLESS), but it not prototyped
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* globally in include/nuttx/clock.h.
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*/
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extern volatile clock_t g_system_ticks;
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#endif
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#ifndef CONFIG_CLOCK_TIMEKEEPING
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extern struct timespec g_basetime;
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extern spinlock_t g_basetime_lock;
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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int clock_basetime(FAR struct timespec *tp);
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void clock_initialize(void);
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void clock_increase_sched_ticks(clock_t ticks);
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clock_t clock_get_sched_ticks(void);
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/****************************************************************************
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* perf_init
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****************************************************************************/
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void perf_init(void);
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#ifdef CONFIG_SCHED_CPULOAD_SYSCLK
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void cpuload_init(void);
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#endif
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#endif /* __SCHED_CLOCK_CLOCK_H */
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