75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include "macro.h"
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/* See source file for an API description. */
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typedef struct Barrier Barrier;
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enum {
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BARRIER_SINGLE = 1LL,
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BARRIER_ABORTION = INT64_MAX,
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/* bias values to store state; keep @WE < @THEY < @I */
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BARRIER_BIAS = INT64_MIN,
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BARRIER_WE_ABORTED = BARRIER_BIAS + 1LL,
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BARRIER_THEY_ABORTED = BARRIER_BIAS + 2LL,
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BARRIER_I_ABORTED = BARRIER_BIAS + 3LL,
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};
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enum {
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BARRIER_PARENT,
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BARRIER_CHILD,
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};
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struct Barrier {
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int me;
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int them;
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int pipe[2];
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int64_t barriers;
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};
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#define BARRIER_NULL {-1, -1, {-1, -1}, 0}
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int barrier_create(Barrier *obj);
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void barrier_destroy(Barrier *b);
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DEFINE_TRIVIAL_CLEANUP_FUNC(Barrier*, barrier_destroy);
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void barrier_set_role(Barrier *b, unsigned role);
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bool barrier_place(Barrier *b);
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bool barrier_abort(Barrier *b);
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bool barrier_wait_next(Barrier *b);
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bool barrier_wait_abortion(Barrier *b);
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bool barrier_sync_next(Barrier *b);
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bool barrier_sync(Barrier *b);
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static inline bool barrier_i_aborted(Barrier *b) {
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return IN_SET(b->barriers, BARRIER_I_ABORTED, BARRIER_WE_ABORTED);
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}
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static inline bool barrier_they_aborted(Barrier *b) {
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return IN_SET(b->barriers, BARRIER_THEY_ABORTED, BARRIER_WE_ABORTED);
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}
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static inline bool barrier_we_aborted(Barrier *b) {
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return b->barriers == BARRIER_WE_ABORTED;
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}
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static inline bool barrier_is_aborted(Barrier *b) {
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return IN_SET(b->barriers,
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BARRIER_I_ABORTED, BARRIER_THEY_ABORTED, BARRIER_WE_ABORTED);
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}
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static inline bool barrier_place_and_sync(Barrier *b) {
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(void) barrier_place(b);
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return barrier_sync(b);
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}
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