blob: 0b9dc700c32b6dd6f3d5d53661a5851541db474f (
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
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <map>
#include <vector>
#include <boost/range/algorithm_ext/erase.hpp>
#include "common/assert.h"
#include "core/core.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/mutex.h"
#include "core/hle/kernel/object_address_table.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
void ReleaseThreadMutexes(Thread* thread) {
for (auto& mtx : thread->held_mutexes) {
mtx->SetHasWaiters(false);
mtx->SetHoldingThread(nullptr);
mtx->WakeupAllWaitingThreads();
}
thread->held_mutexes.clear();
}
Mutex::Mutex() {}
Mutex::~Mutex() {}
SharedPtr<Mutex> Mutex::Create(SharedPtr<Kernel::Thread> holding_thread, VAddr guest_addr,
std::string name) {
SharedPtr<Mutex> mutex(new Mutex);
mutex->guest_addr = guest_addr;
mutex->name = std::move(name);
// If mutex was initialized with a holding thread, acquire it by the holding thread
if (holding_thread) {
mutex->Acquire(holding_thread.get());
}
// Mutexes are referenced by guest address, so track this in the kernel
g_object_address_table.Insert(guest_addr, mutex);
return mutex;
}
bool Mutex::ShouldWait(Thread* thread) const {
auto holding_thread = GetHoldingThread();
return holding_thread != nullptr && thread != holding_thread;
}
void Mutex::Acquire(Thread* thread) {
ASSERT_MSG(!ShouldWait(thread), "object unavailable!");
priority = thread->current_priority;
thread->held_mutexes.insert(this);
SetHoldingThread(thread);
thread->UpdatePriority();
Core::System::GetInstance().PrepareReschedule();
}
ResultCode Mutex::Release(Thread* thread) {
auto holding_thread = GetHoldingThread();
ASSERT(holding_thread);
// We can only release the mutex if it's held by the calling thread.
ASSERT(thread == holding_thread);
holding_thread->held_mutexes.erase(this);
holding_thread->UpdatePriority();
SetHoldingThread(nullptr);
SetHasWaiters(!GetWaitingThreads().empty());
WakeupAllWaitingThreads();
Core::System::GetInstance().PrepareReschedule();
return RESULT_SUCCESS;
}
void Mutex::AddWaitingThread(SharedPtr<Thread> thread) {
WaitObject::AddWaitingThread(thread);
thread->pending_mutexes.insert(this);
SetHasWaiters(true);
UpdatePriority();
}
void Mutex::RemoveWaitingThread(Thread* thread) {
WaitObject::RemoveWaitingThread(thread);
thread->pending_mutexes.erase(this);
if (!GetHasWaiters())
SetHasWaiters(!GetWaitingThreads().empty());
UpdatePriority();
}
void Mutex::UpdatePriority() {
if (!GetHoldingThread())
return;
u32 best_priority = THREADPRIO_LOWEST;
for (auto& waiter : GetWaitingThreads()) {
if (waiter->current_priority < best_priority)
best_priority = waiter->current_priority;
}
if (best_priority != priority) {
priority = best_priority;
GetHoldingThread()->UpdatePriority();
}
}
Handle Mutex::GetOwnerHandle() const {
GuestState guest_state{Memory::Read32(guest_addr)};
return guest_state.holding_thread_handle;
}
SharedPtr<Thread> Mutex::GetHoldingThread() const {
GuestState guest_state{Memory::Read32(guest_addr)};
return g_handle_table.Get<Thread>(guest_state.holding_thread_handle);
}
void Mutex::SetHoldingThread(SharedPtr<Thread> thread) {
GuestState guest_state{Memory::Read32(guest_addr)};
guest_state.holding_thread_handle.Assign(thread ? thread->guest_handle : 0);
Memory::Write32(guest_addr, guest_state.raw);
}
bool Mutex::GetHasWaiters() const {
GuestState guest_state{Memory::Read32(guest_addr)};
return guest_state.has_waiters != 0;
}
void Mutex::SetHasWaiters(bool has_waiters) {
GuestState guest_state{Memory::Read32(guest_addr)};
guest_state.has_waiters.Assign(has_waiters ? 1 : 0);
Memory::Write32(guest_addr, guest_state.raw);
}
} // namespace Kernel
|
