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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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26
Kernel/Thread.h
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@ -11,7 +11,6 @@
#include <Kernel/Scheduler.h>
#include <Kernel/UnixTypes.h>
#include <Kernel/VM/Region.h>
#include <Kernel/WaitQueue.h>
#include <LibC/fd_set.h>
class Alarm;
@ -291,27 +290,8 @@ public:
return block<ConditionBlocker>(state_string, move(condition));
}
void wait_on(WaitQueue& queue, Thread* beneficiary = nullptr, const char* reason = nullptr)
{
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 wake_from_queue()
{
ASSERT(state() == State::Queued);
set_state(State::Runnable);
}
void wait_on(WaitQueue& queue, Thread* beneficiary = nullptr, const char* reason = nullptr);
void wake_from_queue();
void unblock();
@ -423,9 +403,11 @@ public:
private:
IntrusiveListNode m_runnable_list_node;
IntrusiveListNode m_wait_queue_node;
private:
friend class SchedulerData;
friend class WaitQueue;
bool unlock_process_if_locked();
void relock_process();