This is xnu-12377.1.9. See this file in:
/*
 * Copyright (c) 2025 Apple Inc. All rights reserved.
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 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
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 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
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#pragma once

#include "fibers.h"

#define FIBERS_CONDITION_ALL (-1)

typedef struct fibers_condition fibers_condition_t;

struct fibers_condition {
	struct fibers_queue wait_queue;
};

extern void fibers_condition_wakeup_one(fibers_condition_t *cond);
extern int fibers_condition_wakeup_some(fibers_condition_t *cond, int num_fibers, void (*callback)(void*, fiber_t), void *arg);
extern void fibers_condition_wait(fibers_condition_t *cond);
extern void fibers_condition_destroy(fibers_condition_t *cond);
extern fiber_t fibers_condition_identify(fibers_condition_t *cond);
extern bool fibers_condition_wakeup_identified(fibers_condition_t *cond, fiber_t target);