Fix: waiter: futex wait: handle spurious futex wakeups
[lttng-tools.git] / src / common / waiter.hpp
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287a512f 1/*
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2 * Copyright (C) 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
287a512f 4 *
ab5be9fa 5 * SPDX-License-Identifier: LGPL-2.1-only
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6 *
7 * This code is originally adapted from userspace-rcu's urcu-wait.h
8 */
9
10#ifndef LTTNG_WAITER_H
11#define LTTNG_WAITER_H
12
13#define _LGPL_SOURCE
14
15#include <stdint.h>
16#include <urcu/wfstack.h>
17#include <stdbool.h>
c9e313bc 18#include "macros.hpp"
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19
20struct lttng_waiter {
21 struct cds_wfs_node wait_queue_node;
22 int32_t state;
23};
24
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25void lttng_waiter_init(struct lttng_waiter *waiter);
26
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27void lttng_waiter_wait(struct lttng_waiter *waiter);
28
29/*
30 * lttng_waiter_wake_up must only be called by a single waker.
31 * It is invalid for multiple "wake" operations to be invoked
32 * on a single waiter without re-initializing it before.
33 */
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34void lttng_waiter_wake_up(struct lttng_waiter *waiter);
35
36#endif /* LTTNG_WAITER_H */
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