Fix broken thread stop handling

src/jthread/win32/jthread.cpp

@@ -35,6 +35,7 @@ JThread::JThread()
 {
 	retval = NULL;
 	mutexinit = false;
+	requeststop = false;
 	running = false;
 }
 
@@ -45,7 +46,7 @@ JThread::~JThread()
 
 void JThread::Stop() {
 	runningmutex.Lock();
-	running = false;
+	requeststop = false;
 	runningmutex.Unlock();
 }
 
@@ -76,6 +77,7 @@ int JThread::Start()
 		runningmutex.Unlock();
 		return ERR_JTHREAD_ALREADYRUNNING;
 	}
+	requeststop = false;e
 	runningmutex.Unlock();
 
 	continuemutex.Lock();
@@ -134,6 +136,15 @@ bool JThread::IsRunning()
 	return r;
 }
 
+bool JThread::StopRequested() {
+	bool r;
+
+	runningmutex.Lock();
+	r = requeststop;
+	runningmutex.Unlock();
+	return r;
+}
+
 void *JThread::GetReturnValue()
 {
 	void *val;