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Kernel: Support F_SETLKW in fcntl

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Idan Horowitz 2022-07-14 02:17:01 +03:00 • committed by Andreas Kling
parent 9db10887a1
commit 3a80b25ed6
7 changed files with 133 additions and 29 deletions
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38
Kernel/Thread.h
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@ -283,7 +283,8 @@ public:
Routing,
Sleep,
Signal,
Wait
Wait,
Flock
};
virtual ~Blocker();
virtual StringView state_string() const = 0;
@ -788,6 +789,41 @@ public:
bool m_finalized { false };
};
class FlockBlocker final : public Blocker {
public:
FlockBlocker(NonnullRefPtr<Inode>, flock const&);
virtual StringView state_string() const override { return "Locking File"sv; }
virtual Type blocker_type() const override { return Type::Flock; }
virtual void will_unblock_immediately_without_blocking(UnblockImmediatelyReason) override;
virtual bool setup_blocker() override;
bool try_unblock(bool from_add_blocker);
private:
NonnullRefPtr<Inode> m_inode;
flock const& m_flock;
bool m_did_unblock { false };
};
class FlockBlockerSet final : public BlockerSet {
public:
void unblock_all_blockers_whose_conditions_are_met()
{
BlockerSet::unblock_all_blockers_whose_conditions_are_met([&](auto& b, void*, bool&) {
VERIFY(b.blocker_type() == Blocker::Type::Flock);
auto& blocker = static_cast<Thread::FlockBlocker&>(b);
return blocker.try_unblock(false);
});
}
private:
bool should_add_blocker(Blocker& b, void*) override
{
VERIFY(b.blocker_type() == Blocker::Type::Flock);
auto& blocker = static_cast<Thread::FlockBlocker&>(b);
return !blocker.try_unblock(true);
}
};
template<typename AddBlockerHandler>
ErrorOr<void> try_join(AddBlockerHandler add_blocker)
{