blob: ded3a93c3852a8a3d5adb2f3cb706bd3487275d1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
/*
* Copyright (c) 2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Atomic.h>
#include <AK/RefCounted.h>
#include <Kernel/Locking/Spinlock.h>
#include <Kernel/Memory/VMObject.h>
#include <Kernel/Thread.h>
namespace Kernel {
class FutexQueue final
: public RefCounted<FutexQueue>
, public Thread::BlockerSet {
public:
FutexQueue();
virtual ~FutexQueue();
u32 wake_n_requeue(u32, Function<FutexQueue*()> const&, u32, bool&, bool&);
u32 wake_n(u32, Optional<u32> const&, bool&);
u32 wake_all(bool&);
template<class... Args>
Thread::BlockResult wait_on(Thread::BlockTimeout const& timeout, Args&&... args)
{
return Thread::current()->block<Thread::FutexBlocker>(timeout, *this, forward<Args>(args)...);
}
bool queue_imminent_wait();
bool try_remove();
bool is_empty_and_no_imminent_waits()
{
SpinlockLocker lock(m_lock);
return is_empty_and_no_imminent_waits_locked();
}
bool is_empty_and_no_imminent_waits_locked();
protected:
virtual bool should_add_blocker(Thread::Blocker& b, void*) override;
private:
size_t m_imminent_waits { 1 }; // We only create this object if we're going to be waiting, so start out with 1
bool m_was_removed { false };
};
}
|
