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287a512f JG |
1 | /* |
2 | * Copyright (C) 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | * 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public License | |
15 | * along with this program; if not, write to the Free Software Foundation, | |
16 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | * | |
18 | * This code is originally adapted from userspace-rcu's urcu-wait.h | |
19 | */ | |
20 | ||
21 | #ifndef LTTNG_WAITER_H | |
22 | #define LTTNG_WAITER_H | |
23 | ||
24 | #define _LGPL_SOURCE | |
25 | ||
26 | #include <stdint.h> | |
27 | #include <urcu/wfstack.h> | |
28 | #include <stdbool.h> | |
29 | #include "macros.h" | |
30 | ||
31 | struct lttng_waiter { | |
32 | struct cds_wfs_node wait_queue_node; | |
33 | int32_t state; | |
34 | }; | |
35 | ||
36 | LTTNG_HIDDEN | |
37 | void lttng_waiter_init(struct lttng_waiter *waiter); | |
38 | ||
39 | LTTNG_HIDDEN | |
40 | void lttng_waiter_wait(struct lttng_waiter *waiter); | |
41 | ||
42 | /* | |
43 | * lttng_waiter_wake_up must only be called by a single waker. | |
44 | * It is invalid for multiple "wake" operations to be invoked | |
45 | * on a single waiter without re-initializing it before. | |
46 | */ | |
47 | LTTNG_HIDDEN | |
48 | void lttng_waiter_wake_up(struct lttng_waiter *waiter); | |
49 | ||
50 | #endif /* LTTNG_WAITER_H */ |