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https://github.com/apache/nuttx.git
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ouyangxiangzhen
b2fadb8529
On 32-bit platform with 64-bit pointer, read/write to the `g_hrtimer_running` is not atomic, we should protect it with the seqcount to ensure the value we read is correct. Signed-off-by: ouyangxiangzhen <ouyangxiangzhen@xiaomi.com>
100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
/****************************************************************************
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* sched/hrtimer/hrtimer_initialize.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, 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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include "hrtimer/hrtimer.h"
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* Array of pointers to currently running high-resolution timers
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* for each CPU in SMP configurations. Index corresponds to CPU ID.
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*/
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#ifdef CONFIG_SMP
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uintptr_t g_hrtimer_running[CONFIG_SMP_NCPUS];
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#endif
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/* Global spinlock protecting the high-resolution timer subsystem.
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*
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* This spinlock serializes access to the hrtimer container and
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* protects timer state transitions. It must be held whenever the
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* timer container is modified.
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*/
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seqcount_t g_hrtimer_lock = SEQLOCK_INITIALIZER;
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/* Container for all active high-resolution timers.
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*
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* When CONFIG_HRTIMER_TREE is enabled, timers are stored in a container.
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* When disabled, timers are stored in a linked list.
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*
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* The container is ordered by absolute expiration time in
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* both configurations.
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*/
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#ifdef CONFIG_HRTIMER_TREE
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/* Red-black tree for hrtimer storage (requires CONFIG_HRTIMER_TREE) */
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struct hrtimer_tree_s g_hrtimer_tree = RB_INITIALIZER(g_hrtimer_tree);
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#else
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/* Linked list for hrtimer storage (fallback when tree is disabled) */
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struct list_node g_hrtimer_list = LIST_INITIAL_VALUE(g_hrtimer_list);
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: RB_GENERATE
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*
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* Description:
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* Instantiate the container helper functions for the hrtimer
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* subsystem.
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*
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* This macro generates the static inline functions required to
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* manipulate the hrtimer container, including insertion,
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* removal, and lookup operations.
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*
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* Note: This is only compiled when CONFIG_HRTIMER_TREE is enabled.
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*
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* Assumptions/Notes:
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* - The tree key is the absolute expiration time stored in
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* hrtimer_node_s and compared via hrtimer_compare().
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* - All accesses to the tree must be serialized using
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* g_hrtimer_lock.
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* - These generated functions are used internally by the hrtimer
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* core (e.g., hrtimer_start(), hrtimer_cancel(), and expire paths).
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****************************************************************************/
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#ifdef CONFIG_HRTIMER_TREE
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RB_GENERATE(hrtimer_tree_s, hrtimer_node_s, entry, hrtimer_compare);
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#endif
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