configure: add '-Wundef' to warning flags
[lttng-tools.git] / src / common / waiter.h
1 /*
2 * Copyright (C) 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 *
5 * SPDX-License-Identifier: LGPL-2.1-only
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>
18 #include "macros.h"
19
20 struct lttng_waiter {
21 struct cds_wfs_node wait_queue_node;
22 int32_t state;
23 };
24
25 void lttng_waiter_init(struct lttng_waiter *waiter);
26
27 void 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 */
34 void lttng_waiter_wake_up(struct lttng_waiter *waiter);
35
36 #endif /* LTTNG_WAITER_H */
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