mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-04 05:20:30 +00:00
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
/*
|
|
* Copyright (c) 2021, Brian Gianforcaro <bgianf@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/EnumBits.h>
|
|
|
|
namespace Kernel {
|
|
// To catch bugs where locks are taken out of order, we annotate all locks
|
|
// in the kernel with a rank. The rank describes the order in which locks
|
|
// are allowed to be taken. If a lock is acquired, and it is of an incompatible
|
|
// rank with the lock held by the executing thread then the system can detect
|
|
// the lock order violation and respond appropriately (crash with error).
|
|
//
|
|
// A thread holding a lower ranked lock cannot acquire a lock of a greater or equal rank.
|
|
enum class LockRank : int {
|
|
// Special marker for locks which haven't been annotated yet.
|
|
// Note: This should be removed once all locks are annotated.
|
|
None = 0x000,
|
|
|
|
// We need to be able to handle page faults from anywhere, so
|
|
// memory manager locks are our lowest rank lock.
|
|
MemoryManager = 0x001,
|
|
|
|
Interrupts = 0x002,
|
|
|
|
FileSystem = 0x004,
|
|
|
|
Thread = 0x008,
|
|
|
|
// Process locks are the highest rank, as they normally are taken
|
|
// first thing when processing syscalls.
|
|
Process = 0x010,
|
|
};
|
|
|
|
AK_ENUM_BITWISE_OPERATORS(LockRank);
|
|
|
|
void track_lock_acquire(LockRank);
|
|
void track_lock_release(LockRank);
|
|
}
|