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Kernel: Use IntrusiveList to make WaitQueue allocation-free :^)

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This commit is contained in:
Andreas Kling 2019-12-22 12:23:44 +01:00
parent 96cfddb3ac
commit f4978b2be1
4 changed files with 30 additions and 26 deletions
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22
Kernel/Thread.cpp
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@ -776,3 +776,25 @@ const char* to_string(ThreadPriority priority)
ASSERT_NOT_REACHED();
return nullptr;
}
void Thread::wait_on(WaitQueue& queue, Thread* beneficiary, const char* reason)
{
bool did_unlock = unlock_process_if_locked();
cli();
set_state(State::Queued);
queue.enqueue(*current);
// Yield and wait for the queue to wake us up again.
if (beneficiary)
Scheduler::donate_to(beneficiary, reason);
else
Scheduler::yield();
// We've unblocked, relock the process if needed and carry on.
if (did_unlock)
relock_process();
}
void Thread::wake_from_queue()
{
ASSERT(state() == State::Queued);
set_state(State::Runnable);
}