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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899// SPDX-License-Identifier: GPL-2.0-or-later/* * Generic Timer-queue * * Manages a simple queue of timers, ordered by expiration time. * Uses rbtrees for quick list adds and expiration. * * NOTE: All of the following functions need to be serialized * to avoid races. No locking is done by this library code. */
#include <linux/bug.h>#include <linux/timerqueue.h>#include <linux/rbtree.h>#include <linux/export.h>
#define __node_2_tq(_n) \ rb_entry((_n), struct timerqueue_node, node)
static inline bool __timerqueue_less(struct rb_node *a, const struct rb_node *b){ return __node_2_tq(a)->expires < __node_2_tq(b)->expires;}
/** * timerqueue_add - Adds timer to timerqueue. * * @head: head of timerqueue * @node: timer node to be added * * Adds the timer node to the timerqueue, sorted by the node's expires * value. Returns true if the newly added timer is the first expiring timer in * the queue. */bool timerqueue_add(struct timerqueue_head *head, struct timerqueue_node *node){ /* Make sure we don't add nodes that are already added */ WARN_ON_ONCE(!RB_EMPTY_NODE(&node->node));
return rb_add_cached(&node->node, &head->rb_root, __timerqueue_less);}EXPORT_SYMBOL_GPL(timerqueue_add);
/** * timerqueue_del - Removes a timer from the timerqueue. * * @head: head of timerqueue * @node: timer node to be removed * * Removes the timer node from the timerqueue. Returns true if the queue is * not empty after the remove. */bool timerqueue_del(struct timerqueue_head *head, struct timerqueue_node *node){ WARN_ON_ONCE(RB_EMPTY_NODE(&node->node));
rb_erase_cached(&node->node, &head->rb_root); RB_CLEAR_NODE(&node->node);
return !RB_EMPTY_ROOT(&head->rb_root.rb_root);}EXPORT_SYMBOL_GPL(timerqueue_del);
/** * timerqueue_iterate_next - Returns the timer after the provided timer * * @node: Pointer to a timer. * * Provides the timer that is after the given node. This is used, when * necessary, to iterate through the list of timers in a timer list * without modifying the list. */struct timerqueue_node *timerqueue_iterate_next(struct timerqueue_node *node){ struct rb_node *next;
if (!node) return NULL; next = rb_next(&node->node); if (!next) return NULL; return container_of(next, struct timerqueue_node, node);}EXPORT_SYMBOL_GPL(timerqueue_iterate_next);
#define __node_2_tq_linked(_n) \ container_of(rb_entry((_n), struct rb_node_linked, node), struct timerqueue_linked_node, node)
static __always_inline bool __tq_linked_less(struct rb_node *a, const struct rb_node *b){ return __node_2_tq_linked(a)->expires < __node_2_tq_linked(b)->expires;}
bool timerqueue_linked_add(struct timerqueue_linked_head *head, struct timerqueue_linked_node *node){ return rb_add_linked(&node->node, &head->rb_root, __tq_linked_less);}EXPORT_SYMBOL_GPL(timerqueue_linked_add);