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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/assert.h"
#include "common/common_types.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/k_scoped_scheduler_lock_and_sleep.h"
#include "core/hle/kernel/k_synchronization_object.h"
#include "core/hle/kernel/k_thread.h"
#include "core/hle/kernel/k_thread_queue.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/svc_results.h"
namespace Kernel {
namespace {
class ThreadQueueImplForKSynchronizationObjectWait final : public KThreadQueueWithoutEndWait {
public:
ThreadQueueImplForKSynchronizationObjectWait(KernelCore& kernel_, KSynchronizationObject** o,
KSynchronizationObject::ThreadListNode* n, s32 c)
: KThreadQueueWithoutEndWait(kernel_), m_objects(o), m_nodes(n), m_count(c) {}
void NotifyAvailable(KThread* waiting_thread, KSynchronizationObject* signaled_object,
Result wait_result) override {
// Determine the sync index, and unlink all nodes.
s32 sync_index = -1;
for (auto i = 0; i < m_count; ++i) {
// Check if this is the signaled object.
if (m_objects[i] == signaled_object && sync_index == -1) {
sync_index = i;
}
// Unlink the current node from the current object.
m_objects[i]->UnlinkNode(std::addressof(m_nodes[i]));
}
// Set the waiting thread's sync index.
waiting_thread->SetSyncedIndex(sync_index);
// Set the waiting thread as not cancellable.
waiting_thread->ClearCancellable();
// Invoke the base end wait handler.
KThreadQueue::EndWait(waiting_thread, wait_result);
}
void CancelWait(KThread* waiting_thread, Result wait_result, bool cancel_timer_task) override {
// Remove all nodes from our list.
for (auto i = 0; i < m_count; ++i) {
m_objects[i]->UnlinkNode(std::addressof(m_nodes[i]));
}
// Set the waiting thread as not cancellable.
waiting_thread->ClearCancellable();
// Invoke the base cancel wait handler.
KThreadQueue::CancelWait(waiting_thread, wait_result, cancel_timer_task);
}
private:
KSynchronizationObject** m_objects;
KSynchronizationObject::ThreadListNode* m_nodes;
s32 m_count;
};
} // namespace
void KSynchronizationObject::Finalize() {
this->OnFinalizeSynchronizationObject();
KAutoObject::Finalize();
}
Result KSynchronizationObject::Wait(KernelCore& kernel, s32* out_index,
KSynchronizationObject** objects, const s32 num_objects,
s64 timeout) {
// Allocate space on stack for thread nodes.
std::vector<ThreadListNode> thread_nodes(num_objects);
// Prepare for wait.
KThread* thread = GetCurrentThreadPointer(kernel);
KHardwareTimer* timer{};
ThreadQueueImplForKSynchronizationObjectWait wait_queue(kernel, objects, thread_nodes.data(),
num_objects);
{
// Setup the scheduling lock and sleep.
KScopedSchedulerLockAndSleep slp(kernel, std::addressof(timer), thread, timeout);
// Check if the thread should terminate.
if (thread->IsTerminationRequested()) {
slp.CancelSleep();
R_THROW(ResultTerminationRequested);
}
// Check if any of the objects are already signaled.
for (auto i = 0; i < num_objects; ++i) {
ASSERT(objects[i] != nullptr);
if (objects[i]->IsSignaled()) {
*out_index = i;
slp.CancelSleep();
R_THROW(ResultSuccess);
}
}
// Check if the timeout is zero.
if (timeout == 0) {
slp.CancelSleep();
R_THROW(ResultTimedOut);
}
// Check if waiting was canceled.
if (thread->IsWaitCancelled()) {
slp.CancelSleep();
thread->ClearWaitCancelled();
R_THROW(ResultCancelled);
}
// Add the waiters.
for (auto i = 0; i < num_objects; ++i) {
thread_nodes[i].thread = thread;
thread_nodes[i].next = nullptr;
objects[i]->LinkNode(std::addressof(thread_nodes[i]));
}
// Mark the thread as cancellable.
thread->SetCancellable();
// Clear the thread's synced index.
thread->SetSyncedIndex(-1);
// Wait for an object to be signaled.
wait_queue.SetHardwareTimer(timer);
thread->BeginWait(std::addressof(wait_queue));
thread->SetWaitReasonForDebugging(ThreadWaitReasonForDebugging::Synchronization);
}
// Set the output index.
*out_index = thread->GetSyncedIndex();
// Get the wait result.
R_RETURN(thread->GetWaitResult());
}
KSynchronizationObject::KSynchronizationObject(KernelCore& kernel_)
: KAutoObjectWithList{kernel_} {}
KSynchronizationObject::~KSynchronizationObject() = default;
void KSynchronizationObject::NotifyAvailable(Result result) {
KScopedSchedulerLock sl(kernel);
// If we're not signaled, we've nothing to notify.
if (!this->IsSignaled()) {
return;
}
// Iterate over each thread.
for (auto* cur_node = m_thread_list_head; cur_node != nullptr; cur_node = cur_node->next) {
cur_node->thread->NotifyAvailable(this, result);
}
}
std::vector<KThread*> KSynchronizationObject::GetWaitingThreadsForDebugging() const {
std::vector<KThread*> threads;
// If debugging, dump the list of waiters.
{
KScopedSchedulerLock lock(kernel);
for (auto* cur_node = m_thread_list_head; cur_node != nullptr; cur_node = cur_node->next) {
threads.emplace_back(cur_node->thread);
}
}
return threads;
}
} // namespace Kernel
|
