From 2f3020a10247a0cb47848a6f8c19fbde50a7e0a6 Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Tue, 20 Jan 2015 18:33:23 -0500
Subject: Mutex: Cleanup and remove redundant code.

---
 src/core/hle/kernel/mutex.cpp | 72 ++++++++++++++++---------------------------
 1 file changed, 27 insertions(+), 45 deletions(-)

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

diff --git a/src/core/hle/kernel/mutex.cpp b/src/core/hle/kernel/mutex.cpp
index c170e55ff..cd05a1397 100644
--- a/src/core/hle/kernel/mutex.cpp
+++ b/src/core/hle/kernel/mutex.cpp
@@ -23,9 +23,8 @@ public:
 
     bool initial_locked;                        ///< Initial lock state when mutex was created
     bool locked;                                ///< Current locked state
-    Handle lock_thread;                         ///< Handle to thread that currently has mutex
     std::string name;                           ///< Name of mutex (optional)
-    SharedPtr<Thread> current_thread;           ///< Thread that has acquired the mutex
+    SharedPtr<Thread> holding_thread;           ///< Thread that has acquired the mutex
 
     bool ShouldWait() override;
     void Acquire() override;
@@ -33,18 +32,17 @@ public:
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-typedef std::multimap<Handle, Handle> MutexMap;
+typedef std::multimap<SharedPtr<Thread>, SharedPtr<Mutex>> MutexMap;
 static MutexMap g_mutex_held_locks;
 
 /**
  * Acquires the specified mutex for the specified thread
  * @param mutex Mutex that is to be acquired
- * @param thread Thread that will acquired
+ * @param thread Thread that will acquire the mutex
  */
-void MutexAcquireLock(Mutex* mutex, Handle thread = GetCurrentThread()->GetHandle()) {
-    g_mutex_held_locks.insert(std::make_pair(thread, mutex->GetHandle()));
-    mutex->lock_thread = thread;
-    mutex->current_thread = Kernel::g_handle_table.Get<Thread>(thread);
+void MutexAcquireLock(Mutex* mutex, Thread* thread) {
+    g_mutex_held_locks.insert(std::make_pair(thread, mutex));
+    mutex->holding_thread = thread;
 }
 
 /**
@@ -55,51 +53,39 @@ void ResumeWaitingThread(Mutex* mutex) {
     // Find the next waiting thread for the mutex...
     auto next_thread = mutex->WakeupNextThread();
     if (next_thread != nullptr) {
-        MutexAcquireLock(mutex, next_thread->GetHandle());
+        MutexAcquireLock(mutex, next_thread);
     } else {
         // Reset mutex lock thread handle, nothing is waiting
         mutex->locked = false;
-        mutex->lock_thread = -1;
+        mutex->holding_thread = nullptr;
     }
 }
 
-void MutexEraseLock(Mutex* mutex) {
-    Handle handle = mutex->GetHandle();
-    auto locked = g_mutex_held_locks.equal_range(mutex->lock_thread);
-    for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
-        if (iter->second == handle) {
-            g_mutex_held_locks.erase(iter);
-            break;
-        }
-    }
-    mutex->lock_thread = -1;
-}
-
-void ReleaseThreadMutexes(Handle thread) {
+void ReleaseThreadMutexes(Thread* thread) {
     auto locked = g_mutex_held_locks.equal_range(thread);
     
     // Release every mutex that the thread holds, and resume execution on the waiting threads
-    for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
-        Mutex* mutex = g_handle_table.Get<Mutex>(iter->second).get();
-        ResumeWaitingThread(mutex);
+    for (auto iter = locked.first; iter != locked.second; ++iter) {
+        ResumeWaitingThread(iter->second.get());
     }
 
     // Erase all the locks that this thread holds
     g_mutex_held_locks.erase(thread);
 }
 
-bool LockMutex(Mutex* mutex) {
-    // Mutex alread locked?
+bool ReleaseMutex(Mutex* mutex) {
     if (mutex->locked) {
-        return false;
-    }
-    MutexAcquireLock(mutex);
-    return true;
-}
+        auto locked = g_mutex_held_locks.equal_range(mutex->holding_thread);
 
-bool ReleaseMutex(Mutex* mutex) {
-    MutexEraseLock(mutex);
-    ResumeWaitingThread(mutex);
+        for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
+            if (iter->second == mutex) {
+                g_mutex_held_locks.erase(iter);
+                break;
+            }
+        }
+
+        ResumeWaitingThread(mutex);
+    }
     return true;
 }
 
@@ -134,16 +120,12 @@ Mutex* CreateMutex(Handle& handle, bool initial_locked, const std::string& name)
 
     mutex->locked = mutex->initial_locked = initial_locked;
     mutex->name = name;
-    mutex->current_thread = nullptr;
+    mutex->holding_thread = nullptr;
 
     // Acquire mutex with current thread if initialized as locked...
-    if (mutex->locked) {
-        MutexAcquireLock(mutex);
+    if (mutex->locked)
+        MutexAcquireLock(mutex, GetCurrentThread());
 
-    // Otherwise, reset lock thread handle
-    } else {
-        mutex->lock_thread = -1;
-    }
     return mutex;
 }
 
@@ -160,13 +142,13 @@ Handle CreateMutex(bool initial_locked, const std::string& name) {
 }
 
 bool Mutex::ShouldWait() {
-    return locked && current_thread != GetCurrentThread();
+    return locked && holding_thread != GetCurrentThread();
 }
 
 void Mutex::Acquire() {
     _assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
     locked = true;
-    MutexAcquireLock(this);
+    MutexAcquireLock(this, GetCurrentThread());
 }
 
 } // namespace
-- 
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