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dac48484ce
This commit updated the comments. Signed-off-by: ouyangxiangzhen <ouyangxiangzhen@xiaomi.com>
99 lines
3 KiB
C
99 lines
3 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_absolute
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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.
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*
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* Input Parameters:
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* hrtimer - Pointer to the hrtimer.
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* func - Expiration callback function.
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* expired - Expiration time in nanoseconds.
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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:
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* - hrtimer is not NULL and func is not NULL.
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*
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****************************************************************************/
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int hrtimer_start_absolute(FAR hrtimer_t *hrtimer, hrtimer_entry_t func,
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uint64_t expired)
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{
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irqstate_t flags;
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bool reprogram = false;
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int ret = OK;
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DEBUGASSERT(hrtimer != NULL && func != NULL);
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/* Acquire the lock and seize the ownership of the hrtimer queue. */
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flags = write_seqlock_irqsave(&g_hrtimer_lock);
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/* Ensure no running core can write the hrtimer. */
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hrtimer_cancel_running(hrtimer);
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if (hrtimer_is_pending(hrtimer))
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{
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reprogram = hrtimer_remove(hrtimer);
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}
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hrtimer->func = func;
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hrtimer->expired = expired;
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/* Insert the timer into the hrtimer queue. */
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reprogram |= hrtimer_insert(hrtimer);
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/* If the inserted timer is now the earliest, start hardware timer */
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if (reprogram)
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{
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hrtimer_reprogram(hrtimer->expired);
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}
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/* Release the lock and give up the ownership of the hrtimer queue. */
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write_sequnlock_irqrestore(&g_hrtimer_lock, flags);
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return ret;
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}
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