From c5aefe42aaec7afa29d317709cacc8524f7add20 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Tue, 11 Feb 2020 10:46:25 -0400
Subject: Kernel: Change WaitObject to Synchronization object. In order to
 better reflect RE.

---
 src/core/hle/kernel/synchronization_object.cpp | 104 +++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 src/core/hle/kernel/synchronization_object.cpp

(limited to 'src/core/hle/kernel/synchronization_object.cpp')

diff --git a/src/core/hle/kernel/synchronization_object.cpp b/src/core/hle/kernel/synchronization_object.cpp
new file mode 100644
index 000000000..95f3f9245
--- /dev/null
+++ b/src/core/hle/kernel/synchronization_object.cpp
@@ -0,0 +1,104 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "common/logging/log.h"
+#include "core/core.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/object.h"
+#include "core/hle/kernel/process.h"
+#include "core/hle/kernel/synchronization_object.h"
+#include "core/hle/kernel/thread.h"
+
+namespace Kernel {
+
+SynchronizationObject::SynchronizationObject(KernelCore& kernel) : Object{kernel} {}
+SynchronizationObject::~SynchronizationObject() = default;
+
+void SynchronizationObject::AddWaitingThread(std::shared_ptr<Thread> thread) {
+    auto itr = std::find(waiting_threads.begin(), waiting_threads.end(), thread);
+    if (itr == waiting_threads.end())
+        waiting_threads.push_back(std::move(thread));
+}
+
+void SynchronizationObject::RemoveWaitingThread(std::shared_ptr<Thread> thread) {
+    auto itr = std::find(waiting_threads.begin(), waiting_threads.end(), thread);
+    // If a thread passed multiple handles to the same object,
+    // the kernel might attempt to remove the thread from the object's
+    // waiting threads list multiple times.
+    if (itr != waiting_threads.end())
+        waiting_threads.erase(itr);
+}
+
+std::shared_ptr<Thread> SynchronizationObject::GetHighestPriorityReadyThread() const {
+    Thread* candidate = nullptr;
+    u32 candidate_priority = THREADPRIO_LOWEST + 1;
+
+    for (const auto& thread : waiting_threads) {
+        const ThreadStatus thread_status = thread->GetStatus();
+
+        // The list of waiting threads must not contain threads that are not waiting to be awakened.
+        ASSERT_MSG(thread_status == ThreadStatus::WaitSynch ||
+                       thread_status == ThreadStatus::WaitHLEEvent,
+                   "Inconsistent thread statuses in waiting_threads");
+
+        if (thread->GetPriority() >= candidate_priority)
+            continue;
+
+        if (ShouldWait(thread.get()))
+            continue;
+
+        candidate = thread.get();
+        candidate_priority = thread->GetPriority();
+    }
+
+    return SharedFrom(candidate);
+}
+
+void SynchronizationObject::WakeupWaitingThread(std::shared_ptr<Thread> thread) {
+    ASSERT(!ShouldWait(thread.get()));
+
+    if (!thread) {
+        return;
+    }
+
+    if (thread->IsSleepingOnWait()) {
+        for (const auto& object : thread->GetSynchronizationObjects()) {
+            ASSERT(!object->ShouldWait(thread.get()));
+            object->Acquire(thread.get());
+        }
+    } else {
+        Acquire(thread.get());
+    }
+
+    const std::size_t index = thread->GetSynchronizationObjectIndex(SharedFrom(this));
+
+    thread->ClearSynchronizationObjects();
+
+    thread->CancelWakeupTimer();
+
+    bool resume = true;
+    if (thread->HasWakeupCallback()) {
+        resume = thread->InvokeWakeupCallback(ThreadWakeupReason::Signal, thread, SharedFrom(this),
+                                              index);
+    }
+    if (resume) {
+        thread->ResumeFromWait();
+        kernel.PrepareReschedule(thread->GetProcessorID());
+    }
+}
+
+void SynchronizationObject::WakeupAllWaitingThreads() {
+    while (auto thread = GetHighestPriorityReadyThread()) {
+        WakeupWaitingThread(thread);
+    }
+}
+
+const std::vector<std::shared_ptr<Thread>>& SynchronizationObject::GetWaitingThreads() const {
+    return waiting_threads;
+}
+
+} // namespace Kernel
-- 
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