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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
279da1e3 DH |
2 | #pragma once |
3 | ||
4 | /*** | |
5 | This file is part of systemd. | |
6 | ||
7 | Copyright 2014 David Herrmann <dh.herrmann@gmail.com> | |
279da1e3 DH |
8 | ***/ |
9 | ||
11c3a366 TA |
10 | #include <stdbool.h> |
11 | #include <stdint.h> | |
279da1e3 DH |
12 | #include <sys/types.h> |
13 | ||
14 | #include "macro.h" | |
279da1e3 DH |
15 | |
16 | /* See source file for an API description. */ | |
17 | ||
18 | typedef struct Barrier Barrier; | |
19 | ||
20 | enum { | |
21 | BARRIER_SINGLE = 1LL, | |
22 | BARRIER_ABORTION = INT64_MAX, | |
23 | ||
24 | /* bias values to store state; keep @WE < @THEY < @I */ | |
25 | BARRIER_BIAS = INT64_MIN, | |
26 | BARRIER_WE_ABORTED = BARRIER_BIAS + 1LL, | |
27 | BARRIER_THEY_ABORTED = BARRIER_BIAS + 2LL, | |
28 | BARRIER_I_ABORTED = BARRIER_BIAS + 3LL, | |
29 | }; | |
30 | ||
31 | enum { | |
32 | BARRIER_PARENT, | |
33 | BARRIER_CHILD, | |
34 | }; | |
35 | ||
36 | struct Barrier { | |
37 | int me; | |
38 | int them; | |
39 | int pipe[2]; | |
40 | int64_t barriers; | |
41 | }; | |
42 | ||
7566e267 ZJS |
43 | #define BARRIER_NULL {-1, -1, {-1, -1}, 0} |
44 | ||
45 | int barrier_create(Barrier *obj); | |
279da1e3 DH |
46 | void barrier_destroy(Barrier *b); |
47 | ||
fc808616 DH |
48 | DEFINE_TRIVIAL_CLEANUP_FUNC(Barrier*, barrier_destroy); |
49 | ||
279da1e3 DH |
50 | void barrier_set_role(Barrier *b, unsigned int role); |
51 | ||
52 | bool barrier_place(Barrier *b); | |
53 | bool barrier_abort(Barrier *b); | |
54 | ||
55 | bool barrier_wait_next(Barrier *b); | |
56 | bool barrier_wait_abortion(Barrier *b); | |
57 | bool barrier_sync_next(Barrier *b); | |
58 | bool barrier_sync(Barrier *b); | |
59 | ||
60 | static inline bool barrier_i_aborted(Barrier *b) { | |
3742095b | 61 | return IN_SET(b->barriers, BARRIER_I_ABORTED, BARRIER_WE_ABORTED); |
279da1e3 DH |
62 | } |
63 | ||
64 | static inline bool barrier_they_aborted(Barrier *b) { | |
3742095b | 65 | return IN_SET(b->barriers, BARRIER_THEY_ABORTED, BARRIER_WE_ABORTED); |
279da1e3 DH |
66 | } |
67 | ||
68 | static inline bool barrier_we_aborted(Barrier *b) { | |
69 | return b->barriers == BARRIER_WE_ABORTED; | |
70 | } | |
71 | ||
72 | static inline bool barrier_is_aborted(Barrier *b) { | |
d29ad81e ZJS |
73 | return IN_SET(b->barriers, |
74 | BARRIER_I_ABORTED, BARRIER_THEY_ABORTED, BARRIER_WE_ABORTED); | |
279da1e3 DH |
75 | } |
76 | ||
77 | static inline bool barrier_place_and_sync(Barrier *b) { | |
dc751688 | 78 | (void) barrier_place(b); |
279da1e3 DH |
79 | return barrier_sync(b); |
80 | } |