wangchdo commented on code in PR #17489: URL: https://github.com/apache/nuttx/pull/17489#discussion_r2621579377
########## sched/hrtimer/hrtimer.h: ########## @@ -0,0 +1,172 @@ +/**************************************************************************** + * sched/hrtimer/hrtimer.h + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +#ifndef __SCHED_HRTIMER_HRTIMER_H +#define __SCHED_HRTIMER_HRTIMER_H + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <nuttx/arch.h> +#include <nuttx/clock.h> +#include <nuttx/hrtimer.h> + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/* Red-Black tree containing all active high-resolution timers */ + +extern struct hrtimer_tree_s g_activetree; + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/* Red-black tree head for managing active hrtimers */ + +RB_HEAD(hrtimer_tree_s, hrtimer_node_s); + +/**************************************************************************** + * Public Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Name: hrtimer_process + * + * Description: + * Called from the timer interrupt handler to process expired + * high-resolution timers. If a timer has expired, its callback + * function will be executed in the context of the timer interrupt. + * + * Input Parameters: + * now - The current time (nsecs). + * + * Returned Value: + * None + ****************************************************************************/ + +void hrtimer_process(uint64_t now); + +/**************************************************************************** + * Inline Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: hrtimer_gettime + * + * Description: + * Get the current high-resolution time in nanoseconds. + * + * Returned Value: + * Current time in nanoseconds. + ****************************************************************************/ + +static inline_function +uint64_t hrtimer_gettime(void) +{ + struct timespec ts; + + /* Get current time from platform-specific timer */ + + clock_systime_timespec(&ts); + + /* Convert timespec to nanoseconds */ + + return clock_time2nsec(&ts); +} + +/**************************************************************************** + * Name: hrtimer_starttimer + * + * Description: + * Start the hardware timer to expire at a specified nanosecond time. + * Converts the nanosecond time to timespec and calls the platform-specific + * timer start function. + * + * Input Parameters: + * ns - Expiration time in nanoseconds. + * + * Returned Value: + * OK (0) on success, negated errno on failure. + ****************************************************************************/ + +static inline_function +int hrtimer_starttimer(uint64_t ns) Review Comment: Done However, I want to emphasize once again that the hrtimer is designed to provide nanosecond-resolution timing. It is not related to the tickless or non-tickless concepts, which apply to the scheduler or watchdog (wdog) ticks. The hrtimer is a separate module, independent of scheduler ticks like wdog, and it uses its own dedicated instance to provide high-resolution timing. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
