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Kernel: Some futex improvements
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.
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7581b64705
commit
1d621ab172
23 changed files with 928 additions and 63 deletions
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@ -26,6 +26,7 @@
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#pragma once
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#include <AK/HashTable.h>
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#include <AK/InlineLinkedList.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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@ -38,6 +39,12 @@ namespace Kernel {
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class Inode;
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class PhysicalPage;
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class VMObjectDeletedHandler {
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public:
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virtual ~VMObjectDeletedHandler() { }
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virtual void vmobject_deleted(VMObject&) = 0;
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};
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class VMObject : public RefCounted<VMObject>
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, public Weakable<VMObject>
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, public InlineLinkedListNode<VMObject> {
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@ -71,6 +78,15 @@ public:
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ALWAYS_INLINE void unref_region() { m_regions_count--; }
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ALWAYS_INLINE bool is_shared_by_multiple_regions() const { return m_regions_count > 1; }
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void register_on_deleted_handler(VMObjectDeletedHandler& handler)
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{
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m_on_deleted.set(&handler);
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}
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void unregister_on_deleted_handler(VMObjectDeletedHandler& handler)
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{
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m_on_deleted.remove(&handler);
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}
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protected:
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explicit VMObject(size_t);
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explicit VMObject(const VMObject&);
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@ -89,6 +105,8 @@ private:
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VMObject(VMObject&&) = delete;
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Atomic<u32, AK::MemoryOrder::memory_order_relaxed> m_regions_count { 0 };
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HashTable<VMObjectDeletedHandler*> m_on_deleted;
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SpinLock<u8> m_on_deleted_lock;
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};
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}
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