mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-01-26 19:22:30 -05:00
41376d4662
There was a time window between releasing Lock::m_lock and calling into the lock's WaitQueue where someone else could take m_lock and bring two threads into a deadlock situation. Fix this issue by holding Lock::m_lock until interrupts are disabled by either Thread::wait_on() or WaitQueue::wake_one().
38 lines
723 B
C++
38 lines
723 B
C++
#include <Kernel/Thread.h>
|
|
#include <Kernel/WaitQueue.h>
|
|
|
|
WaitQueue::WaitQueue()
|
|
{
|
|
}
|
|
|
|
WaitQueue::~WaitQueue()
|
|
{
|
|
}
|
|
|
|
void WaitQueue::enqueue(Thread& thread)
|
|
{
|
|
InterruptDisabler disabler;
|
|
m_threads.append(thread);
|
|
}
|
|
|
|
void WaitQueue::wake_one(Atomic<bool>* lock)
|
|
{
|
|
InterruptDisabler disabler;
|
|
if (lock)
|
|
*lock = false;
|
|
if (m_threads.is_empty())
|
|
return;
|
|
if (auto* thread = m_threads.take_first())
|
|
thread->wake_from_queue();
|
|
Scheduler::stop_idling();
|
|
}
|
|
|
|
void WaitQueue::wake_all()
|
|
{
|
|
InterruptDisabler disabler;
|
|
if (m_threads.is_empty())
|
|
return;
|
|
while (!m_threads.is_empty())
|
|
m_threads.take_first()->wake_from_queue();
|
|
Scheduler::stop_idling();
|
|
}
|