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Kernel: Some futex improvements

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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
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7
Kernel/VM/VMObject.cpp
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@ -45,6 +45,13 @@ VMObject::VMObject(size_t size)
VMObject::~VMObject()
{
{
ScopedSpinLock lock(m_on_deleted_lock);
for (auto& it : m_on_deleted)
it->vmobject_deleted(*this);
m_on_deleted.clear();
}
MM.unregister_vmobject(*this);
ASSERT(m_regions_count.load(AK::MemoryOrder::memory_order_relaxed) == 0);
}