blob: 9b40bd22c8acefc10c994ee02873c18a2c30a2ba (
plain) (
blame)
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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
// This file references various implementation details from Atmosphere, an open-source firmware for
// the Nintendo Switch. Copyright 2018-2020 Atmosphere-NX.
#pragma once
#include "common/assert.h"
#include "common/spin_lock.h"
#include "core/hardware_properties.h"
#include "core/hle/kernel/kernel.h"
namespace Kernel {
class KernelCore;
template <typename SchedulerType>
class KAbstractSchedulerLock {
public:
explicit KAbstractSchedulerLock(KernelCore& kernel_) : kernel{kernel_} {}
bool IsLockedByCurrentThread() const {
return this->owner_thread == kernel.GetCurrentEmuThreadID();
}
void Lock() {
if (this->IsLockedByCurrentThread()) {
// If we already own the lock, we can just increment the count.
ASSERT(this->lock_count > 0);
this->lock_count++;
} else {
// Otherwise, we want to disable scheduling and acquire the spinlock.
SchedulerType::DisableScheduling(kernel);
this->spin_lock.lock();
// For debug, ensure that our state is valid.
ASSERT(this->lock_count == 0);
ASSERT(this->owner_thread == Core::EmuThreadHandle::InvalidHandle());
// Increment count, take ownership.
this->lock_count = 1;
this->owner_thread = kernel.GetCurrentEmuThreadID();
}
}
void Unlock() {
ASSERT(this->IsLockedByCurrentThread());
ASSERT(this->lock_count > 0);
// Release an instance of the lock.
if ((--this->lock_count) == 0) {
// We're no longer going to hold the lock. Take note of what cores need scheduling.
const u64 cores_needing_scheduling =
SchedulerType::UpdateHighestPriorityThreads(kernel);
Core::EmuThreadHandle leaving_thread = owner_thread;
// Note that we no longer hold the lock, and unlock the spinlock.
this->owner_thread = Core::EmuThreadHandle::InvalidHandle();
this->spin_lock.unlock();
// Enable scheduling, and perform a rescheduling operation.
SchedulerType::EnableScheduling(kernel, cores_needing_scheduling, leaving_thread);
}
}
private:
KernelCore& kernel;
Common::SpinLock spin_lock{};
s32 lock_count{};
Core::EmuThreadHandle owner_thread{Core::EmuThreadHandle::InvalidHandle()};
};
} // namespace Kernel
|
