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https://github.com/SerenityOS/serenity
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Kernel: Don't register thread as custom data for WaitQueueBlocker
When adding a WaitQueueBlocker to a WaitQueue, it stored the blocked thread in the registration's custom "void* data" slot. This was only used to print the Thread* in some debug logging. Now that Blocker always knows its origin Thread, we can simply add a Blocker::thread() accessor and then get the blocked Thread& from there. No need to register custom data.
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@ -301,6 +301,8 @@ public:
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virtual const BlockTimeout& override_timeout(const BlockTimeout& timeout) { return timeout; }
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virtual bool can_be_interrupted() const { return true; }
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Thread& thread() { return m_thread; }
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enum class UnblockImmediatelyReason {
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UnblockConditionAlreadyMet,
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TimeoutInThePast,
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@ -116,7 +116,7 @@ bool Thread::JoinBlocker::unblock(void* value, bool from_add_blocker)
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Thread::WaitQueueBlocker::WaitQueueBlocker(WaitQueue& wait_queue, StringView block_reason)
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: m_block_reason(block_reason)
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{
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if (!add_to_blocker_set(wait_queue, Thread::current()))
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if (!add_to_blocker_set(wait_queue))
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m_should_block = false;
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}
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@ -10,17 +10,16 @@
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namespace Kernel {
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bool WaitQueue::should_add_blocker(Thread::Blocker& b, void* data)
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bool WaitQueue::should_add_blocker(Thread::Blocker& b, void*)
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{
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VERIFY(data != nullptr); // Thread that is requesting to be blocked
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VERIFY(m_lock.is_locked());
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VERIFY(b.blocker_type() == Thread::Blocker::Type::Queue);
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if (m_wake_requested) {
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m_wake_requested = false;
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: do not block thread {}", this, data);
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: do not block thread {}", this, b.thread());
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return false;
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}
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: should block thread {}", this, data);
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: should block thread {}", this, b.thread());
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return true;
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}
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@ -29,11 +28,10 @@ u32 WaitQueue::wake_one()
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u32 did_wake = 0;
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SpinlockLocker lock(m_lock);
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: wake_one", this);
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bool did_unblock_one = unblock_all_blockers_whose_conditions_are_met_locked([&](Thread::Blocker& b, void* data, bool& stop_iterating) {
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VERIFY(data);
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bool did_unblock_one = unblock_all_blockers_whose_conditions_are_met_locked([&](Thread::Blocker& b, void*, bool& stop_iterating) {
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VERIFY(b.blocker_type() == Thread::Blocker::Type::Queue);
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auto& blocker = static_cast<Thread::WaitQueueBlocker&>(b);
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: wake_one unblocking {}", this, data);
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: wake_one unblocking {}", this, blocker.thread());
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if (blocker.unblock()) {
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stop_iterating = true;
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did_wake = 1;
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@ -54,11 +52,10 @@ u32 WaitQueue::wake_n(u32 wake_count)
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: wake_n({})", this, wake_count);
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u32 did_wake = 0;
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bool did_unblock_some = unblock_all_blockers_whose_conditions_are_met_locked([&](Thread::Blocker& b, void* data, bool& stop_iterating) {
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VERIFY(data);
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bool did_unblock_some = unblock_all_blockers_whose_conditions_are_met_locked([&](Thread::Blocker& b, void*, bool& stop_iterating) {
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VERIFY(b.blocker_type() == Thread::Blocker::Type::Queue);
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auto& blocker = static_cast<Thread::WaitQueueBlocker&>(b);
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: wake_n unblocking {}", this, data);
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: wake_n unblocking {}", this, blocker.thread());
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VERIFY(did_wake < wake_count);
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if (blocker.unblock()) {
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if (++did_wake >= wake_count)
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@ -79,12 +76,11 @@ u32 WaitQueue::wake_all()
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: wake_all", this);
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u32 did_wake = 0;
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bool did_unblock_any = unblock_all_blockers_whose_conditions_are_met_locked([&](Thread::Blocker& b, void* data, bool&) {
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VERIFY(data);
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bool did_unblock_any = unblock_all_blockers_whose_conditions_are_met_locked([&](Thread::Blocker& b, void*, bool&) {
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VERIFY(b.blocker_type() == Thread::Blocker::Type::Queue);
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auto& blocker = static_cast<Thread::WaitQueueBlocker&>(b);
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: wake_all unblocking {}", this, data);
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dbgln_if(WAITQUEUE_DEBUG, "WaitQueue @ {}: wake_all unblocking {}", this, blocker.thread());
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if (blocker.unblock()) {
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did_wake++;
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@ -31,7 +31,7 @@ public:
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}
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protected:
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virtual bool should_add_blocker(Thread::Blocker& b, void* data) override;
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virtual bool should_add_blocker(Thread::Blocker& b, void*) override;
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private:
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bool m_wake_requested { false };
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