Implement sceUmdCancelWaitDriveStat().

Core/HLE/sceKernelThread.cpp

@@ -608,7 +608,7 @@ u32 __KernelResumeThreadFromWait(SceUID threadID, int retval)
 // Only run when you can safely accept a context switch
 // Triggers a waitable event, that is, it wakes up all threads that waits for it
 // If any changes were made, it will context switch
-bool __KernelTriggerWait(WaitType type, int id, bool dontSwitch)
+bool __KernelTriggerWait(WaitType type, int id, bool useRetVal, int retVal, bool dontSwitch)
 {
 	bool doneAnything = false;
 
@@ -621,6 +621,8 @@ bool __KernelTriggerWait(WaitType type, int id, bool dontSwitch)
 			{
 				// This thread was waiting for the triggered object.
 				__KernelResumeThreadFromWait(t);
+				if (useRetVal)
+					t->setReturnValue(retVal);
 				doneAnything = true;
 			}
 		}
@@ -639,6 +641,16 @@ bool __KernelTriggerWait(WaitType type, int id, bool dontSwitch)
 	return true;
 }
 
+bool __KernelTriggerWait(WaitType type, int id, bool dontSwitch)
+{
+	return __KernelTriggerWait(type, id, false, 0, dontSwitch);
+}
+
+bool __KernelTriggerWait(WaitType type, int id, int retVal, bool dontSwitch)
+{
+	return __KernelTriggerWait(type, id, true, retVal, dontSwitch);
+}
+
 // makes the current thread wait for an event
 void __KernelWaitCurThread(WaitType type, SceUID waitID, u32 waitValue, u32 timeoutPtr, bool processCallbacks)
 {