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https://github.com/apache/nuttx.git
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ouyangxiangzhen
a518c28add
The hrtimer is designed to replace the wdog timer in future, so it should have the callback function in its API. The evaluation results showed there is no any performance degradation since the CPU pipeline can hide the latency. This commit also decoupled the rb-tree implementation with the pending state checking. Signed-off-by: ouyangxiangzhen <ouyangxiangzhen@xiaomi.com>
115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
/****************************************************************************
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* sched/hrtimer/hrtimer_start.c
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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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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****************************************************************************/
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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 <nuttx/arch.h>
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#include <nuttx/clock.h>
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#include <errno.h>
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#include "hrtimer/hrtimer.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: hrtimer_start
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*
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* Description:
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* Start a high-resolution timer to expire after a specified duration
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* in nanoseconds, either as an absolute or relative time.
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*
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* Input Parameters:
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* hrtimer - Pointer to the hrtimer structure.
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* func - Expiration callback function.
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* expired - Expiration time in nanoseconds. Interpretation
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* depends on mode.
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* mode - Timer mode (HRTIMER_MODE_ABS or HRTIMER_MODE_REL).
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*
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* Returned Value:
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* OK (0) on success, or a negated errno value on failure.
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*
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* Assumptions/Notes:
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* - This function disables interrupts briefly via spinlock to safely
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* insert the timer into the RB-tree.
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* - Absolute mode sets the timer to expire at the given absolute time.
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* - Relative mode sets the timer to expire after 'ns'
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* nanoseconds from the current time.
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****************************************************************************/
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int hrtimer_start(FAR hrtimer_t *hrtimer, hrtimer_entry_t func,
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uint64_t expired,
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enum hrtimer_mode_e mode)
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{
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irqstate_t flags;
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int ret = OK;
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DEBUGASSERT(hrtimer != NULL);
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/* Protect RB-tree manipulation with spinlock and disable interrupts */
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flags = spin_lock_irqsave(&g_hrtimer_spinlock);
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if (hrtimer_is_armed(hrtimer))
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{
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hrtimer_remove(hrtimer);
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}
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hrtimer->func = func;
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/* Compute absolute expiration time */
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if (mode == HRTIMER_MODE_ABS)
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{
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hrtimer->expired = expired;
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}
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else
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{
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hrtimer->expired = hrtimer_gettime() + expired;
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}
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/* Ensure expiration time does not overflow */
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DEBUGASSERT(hrtimer->expired >= expired);
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/* Insert the timer into the RB-tree */
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hrtimer_insert(hrtimer);
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/* If the inserted timer is now the earliest, start hardware timer */
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if (hrtimer_is_first(hrtimer))
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{
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ret = hrtimer_starttimer(hrtimer->expired);
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}
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/* Release spinlock and restore interrupts */
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spin_unlock_irqrestore(&g_hrtimer_spinlock, flags);
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return ret;
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}
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