/*
* Copyright (c) 2025 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* 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.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#pragma once
#include "fibers.h"
#define FIBERS_RWLOCK_ASSERT_SHARED 0x01
#define FIBERS_RWLOCK_ASSERT_EXCLUSIVE 0x02
#define FIBERS_RWLOCK_ASSERT_HELD 0x03
#define FIBERS_RWLOCK_ASSERT_NOTHELD 0x04
#define FIBERS_RWLOCK_ASSERT_NOT_OWNED 0x05
#define FIBERS_RWLOCK_WANT_UPGRADE 0x1
typedef struct fibers_rwlock fibers_rwlock_t;
struct fibers_rwlock {
fiber_t writer_active;
unsigned int reader_count;
unsigned int flags;
struct fibers_queue reader_wait_queue;
struct fibers_queue writer_wait_queue;
};
extern void fibers_rwlock_init(fibers_rwlock_t *rwlock);
extern void fibers_rwlock_rdlock(fibers_rwlock_t *rwlock, bool check_may_yield);
extern void fibers_rwlock_wrlock(fibers_rwlock_t *rwlock, bool check_may_yield);
extern int fibers_rwlock_try_rdlock(fibers_rwlock_t *rwlock);
extern int fibers_rwlock_try_wrlock(fibers_rwlock_t *rwlock);
extern void fibers_rwlock_rdunlock(fibers_rwlock_t *rwlock);
extern void fibers_rwlock_wrunlock(fibers_rwlock_t *rwlock);
extern void fibers_rwlock_unlock(fibers_rwlock_t *rwlock);
extern void fibers_rwlock_destroy(fibers_rwlock_t *rwlock);
extern bool fibers_rwlock_upgrade(fibers_rwlock_t *rwlock);
extern void fibers_rwlock_downgrade(fibers_rwlock_t *rwlock);
extern void fibers_rwlock_assert(fibers_rwlock_t *rwlock, unsigned int type);