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include/linux/rcuwait.h
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/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_RCUWAIT_H_ #define _LINUX_RCUWAIT_H_ #include <linux/rcupdate.h> /* * rcuwait provides a way of blocking and waking up a single |
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* task in an rcu-safe manner. |
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* |
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* The only time @task is non-nil is when a user is blocked (or * checking if it needs to) on a condition, and reset as soon as we * know that the condition has succeeded and are awoken. |
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*/ struct rcuwait { |
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struct task_struct __rcu *task; |
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}; #define __RCUWAIT_INITIALIZER(name) \ { .task = NULL, } static inline void rcuwait_init(struct rcuwait *w) { w->task = NULL; } extern void rcuwait_wake_up(struct rcuwait *w); /* * The caller is responsible for locking around rcuwait_wait_event(), * such that writes to @task are properly serialized. */ #define rcuwait_wait_event(w, condition) \ ({ \ |
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rcu_assign_pointer((w)->task, current); \ for (;;) { \ /* \ * Implicit barrier (A) pairs with (B) in \ |
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* rcuwait_wake_up(). \ |
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*/ \ set_current_state(TASK_UNINTERRUPTIBLE); \ if (condition) \ break; \ \ schedule(); \ } \ \ WRITE_ONCE((w)->task, NULL); \ __set_current_state(TASK_RUNNING); \ }) #endif /* _LINUX_RCUWAIT_H_ */ |