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57 lines
1.6 KiB
Objective-C
57 lines
1.6 KiB
Objective-C
//
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// ASRecursiveUnfairLock.h
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// Texture
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//
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// Copyright (c) 2018-present, Pinterest, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <Foundation/Foundation.h>
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#import <AsyncDisplayKit/ASBaseDefines.h>
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#import <pthread/pthread.h>
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#import <os/lock.h>
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// Don't import C-only header if we're in a C++ file
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#ifndef __cplusplus
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#import <stdatomic.h>
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#endif
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// Note: We don't use ATOMIC_VAR_INIT here because C++ compilers don't like it,
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// and it literally does absolutely nothing.
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#define AS_RECURSIVE_UNFAIR_LOCK_INIT ((ASRecursiveUnfairLock){ OS_UNFAIR_LOCK_INIT, NULL, 0})
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NS_ASSUME_NONNULL_BEGIN
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OS_UNFAIR_LOCK_AVAILABILITY
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typedef struct {
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os_unfair_lock _lock;
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_Atomic(pthread_t) _thread; // Write-protected by lock
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int _count; // Protected by lock
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} ASRecursiveUnfairLock;
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/**
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* Lock, blocking if needed.
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*/
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AS_EXTERN OS_UNFAIR_LOCK_AVAILABILITY
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void ASRecursiveUnfairLockLock(ASRecursiveUnfairLock *l);
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/**
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* Try to lock without blocking. Returns whether we took the lock.
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*/
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AS_EXTERN OS_UNFAIR_LOCK_AVAILABILITY
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BOOL ASRecursiveUnfairLockTryLock(ASRecursiveUnfairLock *l);
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/**
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* Unlock. Calling this on a thread that does not own
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* the lock will result in an assertion failure, and undefined
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* behavior if foundation assertions are disabled.
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*/
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AS_EXTERN OS_UNFAIR_LOCK_AVAILABILITY
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void ASRecursiveUnfairLockUnlock(ASRecursiveUnfairLock *l);
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NS_ASSUME_NONNULL_END
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