mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 23:50:19 +00:00
1d621ab172
This adds support for FUTEX_WAKE_OP, FUTEX_WAIT_BITSET, FUTEX_WAKE_BITSET, FUTEX_REQUEUE, and FUTEX_CMP_REQUEUE, as well well as global and private futex and absolute/relative timeouts against the appropriate clock. This also changes the implementation so that kernel resources are only used when a thread is blocked on a futex. Global futexes are implemented as offsets in VMObjects, so that different processes can share a futex against the same VMObject despite potentially being mapped at different virtual addresses.
112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/HashTable.h>
|
|
#include <AK/InlineLinkedList.h>
|
|
#include <AK/RefCounted.h>
|
|
#include <AK/RefPtr.h>
|
|
#include <AK/Vector.h>
|
|
#include <AK/Weakable.h>
|
|
#include <Kernel/Lock.h>
|
|
|
|
namespace Kernel {
|
|
|
|
class Inode;
|
|
class PhysicalPage;
|
|
|
|
class VMObjectDeletedHandler {
|
|
public:
|
|
virtual ~VMObjectDeletedHandler() { }
|
|
virtual void vmobject_deleted(VMObject&) = 0;
|
|
};
|
|
|
|
class VMObject : public RefCounted<VMObject>
|
|
, public Weakable<VMObject>
|
|
, public InlineLinkedListNode<VMObject> {
|
|
friend class MemoryManager;
|
|
friend class Region;
|
|
|
|
public:
|
|
virtual ~VMObject();
|
|
|
|
virtual RefPtr<VMObject> clone() = 0;
|
|
|
|
virtual bool is_anonymous() const { return false; }
|
|
virtual bool is_inode() const { return false; }
|
|
virtual bool is_shared_inode() const { return false; }
|
|
virtual bool is_private_inode() const { return false; }
|
|
virtual bool is_contiguous() const { return false; }
|
|
|
|
size_t page_count() const { return m_physical_pages.size(); }
|
|
const Vector<RefPtr<PhysicalPage>>& physical_pages() const { return m_physical_pages; }
|
|
Vector<RefPtr<PhysicalPage>>& physical_pages() { return m_physical_pages; }
|
|
|
|
size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
|
|
|
|
virtual const char* class_name() const = 0;
|
|
|
|
// For InlineLinkedListNode
|
|
VMObject* m_next { nullptr };
|
|
VMObject* m_prev { nullptr };
|
|
|
|
ALWAYS_INLINE void ref_region() { m_regions_count++; }
|
|
ALWAYS_INLINE void unref_region() { m_regions_count--; }
|
|
ALWAYS_INLINE bool is_shared_by_multiple_regions() const { return m_regions_count > 1; }
|
|
|
|
void register_on_deleted_handler(VMObjectDeletedHandler& handler)
|
|
{
|
|
m_on_deleted.set(&handler);
|
|
}
|
|
void unregister_on_deleted_handler(VMObjectDeletedHandler& handler)
|
|
{
|
|
m_on_deleted.remove(&handler);
|
|
}
|
|
|
|
protected:
|
|
explicit VMObject(size_t);
|
|
explicit VMObject(const VMObject&);
|
|
|
|
template<typename Callback>
|
|
void for_each_region(Callback);
|
|
|
|
Vector<RefPtr<PhysicalPage>> m_physical_pages;
|
|
Lock m_paging_lock { "VMObject" };
|
|
|
|
mutable SpinLock<u8> m_lock;
|
|
|
|
private:
|
|
VMObject& operator=(const VMObject&) = delete;
|
|
VMObject& operator=(VMObject&&) = delete;
|
|
VMObject(VMObject&&) = delete;
|
|
|
|
Atomic<u32, AK::MemoryOrder::memory_order_relaxed> m_regions_count { 0 };
|
|
HashTable<VMObjectDeletedHandler*> m_on_deleted;
|
|
SpinLock<u8> m_on_deleted_lock;
|
|
};
|
|
|
|
}
|