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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/shared/barrier.h | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/shared/barrier.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/shared/barrier.h b/src/shared/barrier.h new file mode 100644 index 0000000..b9fc92d --- /dev/null +++ b/src/shared/barrier.h @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <stdbool.h> +#include <stdint.h> +#include <sys/types.h> + +#include "macro.h" + +/* See source file for an API description. */ + +typedef struct Barrier Barrier; + +enum { + BARRIER_SINGLE = 1LL, + BARRIER_ABORTION = INT64_MAX, + + /* bias values to store state; keep @WE < @THEY < @I */ + BARRIER_BIAS = INT64_MIN, + BARRIER_WE_ABORTED = BARRIER_BIAS + 1LL, + BARRIER_THEY_ABORTED = BARRIER_BIAS + 2LL, + BARRIER_I_ABORTED = BARRIER_BIAS + 3LL, +}; + +enum { + BARRIER_PARENT, + BARRIER_CHILD, +}; + +struct Barrier { + int me; + int them; + int pipe[2]; + int64_t barriers; +}; + +#define BARRIER_NULL {-1, -1, {-1, -1}, 0} + +int barrier_create(Barrier *obj); +Barrier* barrier_destroy(Barrier *b); + +DEFINE_TRIVIAL_CLEANUP_FUNC(Barrier*, barrier_destroy); + +void barrier_set_role(Barrier *b, unsigned role); + +bool barrier_place(Barrier *b); +bool barrier_abort(Barrier *b); + +bool barrier_wait_next(Barrier *b); +bool barrier_wait_abortion(Barrier *b); +bool barrier_sync_next(Barrier *b); +bool barrier_sync(Barrier *b); + +static inline bool barrier_i_aborted(Barrier *b) { + return IN_SET(b->barriers, BARRIER_I_ABORTED, BARRIER_WE_ABORTED); +} + +static inline bool barrier_they_aborted(Barrier *b) { + return IN_SET(b->barriers, BARRIER_THEY_ABORTED, BARRIER_WE_ABORTED); +} + +static inline bool barrier_we_aborted(Barrier *b) { + return b->barriers == BARRIER_WE_ABORTED; +} + +static inline bool barrier_is_aborted(Barrier *b) { + return IN_SET(b->barriers, + BARRIER_I_ABORTED, BARRIER_THEY_ABORTED, BARRIER_WE_ABORTED); +} + +static inline bool barrier_place_and_sync(Barrier *b) { + (void) barrier_place(b); + return barrier_sync(b); +} |