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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.
This commit is contained in:
Tom 2020-12-21 23:21:58 -07:00 committed by Andreas Kling
parent 7581b64705
commit 1d621ab172
23 changed files with 928 additions and 63 deletions

View file

@ -192,6 +192,11 @@ public:
return m_offset_in_vmobject;
}
size_t offset_in_vmobject_from_vaddr(VirtualAddress vaddr) const
{
return m_offset_in_vmobject + vaddr.get() - this->vaddr().get();
}
size_t amount_resident() const;
size_t amount_shared() const;
size_t amount_dirty() const;