Kernel: Separate WaitSynchronization into Wait and Acquire methods.

src/core/hle/kernel/event.cpp

@@ -28,7 +28,7 @@ public:
     bool signaled;                          ///< Whether the event has already been signaled
     std::string name;                       ///< Name of event (optional)
 
-    ResultVal<bool> WaitSynchronization(unsigned index) override {
+    ResultVal<bool> Wait(unsigned index) override {
         bool wait = !signaled;
         if (wait) {
             AddWaitingThread(GetCurrentThread());
@@ -36,6 +36,10 @@ public:
         }
         return MakeResult<bool>(wait);
     }
+
+    ResultVal<bool> Acquire() override {
+        return MakeResult<bool>(true);
+    }
 };
 
 ResultCode SignalEvent(const Handle handle) {

src/core/hle/kernel/kernel.h

@@ -65,11 +65,20 @@ public:
     virtual Kernel::HandleType GetHandleType() const = 0;
 
     /**
-     * Wait for kernel object to synchronize.
+     * Wait the current thread for kernel object to synchronize.
      * @param index Index of wait object (only applies to WaitSynchronizationN)
      * @return True if the current thread should wait as a result of the wait
      */
-    virtual ResultVal<bool> WaitSynchronization(unsigned index=0) {
+    virtual ResultVal<bool> Wait(unsigned index = 0) {
+        LOG_ERROR(Kernel, "(UNIMPLEMENTED)");
+        return UnimplementedFunction(ErrorModule::Kernel);
+    }
+
+    /**
+     * Acquire/lock the kernel object if it is available
+     * @return True if we were able to acquire the kernel object, otherwise false
+     */
+    virtual ResultVal<bool> Acquire() {
         LOG_ERROR(Kernel, "(UNIMPLEMENTED)");
         return UnimplementedFunction(ErrorModule::Kernel);
     }

src/core/hle/kernel/mutex.cpp

@@ -26,7 +26,8 @@ public:
     Handle lock_thread;                         ///< Handle to thread that currently has mutex
     std::string name;                           ///< Name of mutex (optional)
 
-    ResultVal<bool> WaitSynchronization(unsigned index) override;
+    ResultVal<bool> Wait(unsigned index) override;
+    ResultVal<bool> Acquire() override;
 };
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -155,17 +156,25 @@ Handle CreateMutex(bool initial_locked, const std::string& name) {
     return handle;
 }
 
-ResultVal<bool> Mutex::WaitSynchronization(unsigned index) {
-    bool wait = locked;
+ResultVal<bool> Mutex::Wait(unsigned index) {
     if (locked) {
         AddWaitingThread(GetCurrentThread());
         Kernel::WaitCurrentThread_WaitSynchronization(WAITTYPE_MUTEX, this, index);
-    } else {
+    }
+
+    return MakeResult<bool>(locked);
+}
+
+ResultVal<bool> Mutex::Acquire() {
+    bool res = false;
+
+    if (!locked) {
         // Lock the mutex when the first thread accesses it
         locked = true;
+        res = true;
         MutexAcquireLock(this);
     }
 
-    return MakeResult<bool>(wait);
+    return MakeResult<bool>(res);
 }
 } // namespace

src/core/hle/kernel/semaphore.cpp

@@ -32,18 +32,27 @@ public:
         return available_count > 0;
     }
 
-    ResultVal<bool> WaitSynchronization(unsigned index) override {
+    ResultVal<bool> Wait(unsigned index) override {
         bool wait = !IsAvailable();
 
         if (wait) {
             Kernel::WaitCurrentThread_WaitSynchronization(WAITTYPE_SEMA, this, index);
             AddWaitingThread(GetCurrentThread());
-        } else {
-            --available_count;
         }
 
         return MakeResult<bool>(wait);
     }
+
+    ResultVal<bool> Acquire() override {
+        bool res = false;
+
+        if (IsAvailable()) {
+            --available_count;
+            res = true;
+        }
+
+        return MakeResult<bool>(res);
+    }
 };
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////

src/core/hle/kernel/thread.cpp

@@ -22,7 +22,7 @@
 
 namespace Kernel {
 
-ResultVal<bool> Thread::WaitSynchronization(unsigned index) {
+ResultVal<bool> Thread::Wait(unsigned index) {
     const bool wait = status != THREADSTATUS_DORMANT;
     if (wait) {
         AddWaitingThread(GetCurrentThread());
@@ -32,6 +32,10 @@ ResultVal<bool> Thread::WaitSynchronization(unsigned index) {
     return MakeResult<bool>(wait);
 }
 
+ResultVal<bool> Thread::Acquire() {
+    return MakeResult<bool>(true);
+}
+
 // Lists all thread ids that aren't deleted/etc.
 static std::vector<SharedPtr<Thread>> thread_list;
 

src/core/hle/kernel/thread.h

@@ -70,7 +70,8 @@ public:
     inline bool IsSuspended() const { return (status & THREADSTATUS_SUSPEND) != 0; }
     inline bool IsIdle() const { return idle; }
 
-    ResultVal<bool> WaitSynchronization(unsigned index) override;
+    ResultVal<bool> Wait(unsigned index) override;
+    ResultVal<bool> Acquire() override;
 
     s32 GetPriority() const { return current_priority; }
     void SetPriority(s32 priority);

src/core/hle/kernel/timer.cpp

@@ -29,7 +29,7 @@ public:
     u64 initial_delay;                      ///< The delay until the timer fires for the first time
     u64 interval_delay;                     ///< The delay until the timer fires after the first time
 
-    ResultVal<bool> WaitSynchronization(unsigned index) override {
+    ResultVal<bool> Wait(unsigned index) override {
         bool wait = !signaled;
         if (wait) {
             AddWaitingThread(GetCurrentThread());
@@ -37,6 +37,10 @@ public:
         }
         return MakeResult<bool>(wait);
     }
+
+    ResultVal<bool> Acquire() override {
+        return MakeResult<bool>(true);
+    }
 };
 
 /**

src/core/hle/svc.cpp

@@ -127,7 +127,7 @@ static Result WaitSynchronization1(Handle handle, s64 nano_seconds) {
     LOG_TRACE(Kernel_SVC, "called handle=0x%08X(%s:%s), nanoseconds=%lld", handle,
             object->GetTypeName().c_str(), object->GetName().c_str(), nano_seconds);
 
-    ResultVal<bool> wait = object->WaitSynchronization();
+    ResultVal<bool> wait = object->Wait();
 
     // Check for next thread to schedule
     if (wait.Succeeded() && *wait) {
@@ -137,6 +137,8 @@ static Result WaitSynchronization1(Handle handle, s64 nano_seconds) {
         Kernel::GetCurrentThread()->SetWaitAll(false);
 
         HLE::Reschedule(__func__);
+    } else {
+        object->Acquire();
     }
 
     return wait.Code().raw;
@@ -163,15 +165,14 @@ static Result WaitSynchronizationN(s32* out, Handle* handles, s32 handle_count,
             if (object == nullptr)
                 return InvalidHandle(ErrorModule::Kernel).raw;
 
-            ResultVal<bool> wait = object->WaitSynchronization(handle_index);
+            ResultVal<bool> wait = object->Wait(handle_index);
 
             wait_thread = (wait.Succeeded() && *wait);
 
             // If this object waited and we are waiting on all objects to synchronize
-            if (wait_thread && wait_all) {
+            if (wait_thread && wait_all)
                 // Enforce later on that this thread does not continue
                 wait_all_succeeded = true;
-            }
 
             // If this object synchronized and we are not waiting on all objects to synchronize
             if (!wait_thread && !wait_all)