Fix a problem that made valgrind complain on shutdown (not otherwise an issue).

node/DeferredPackets.cpp

@@ -37,6 +37,7 @@ DeferredPackets::DeferredPackets(const RuntimeEnvironment *renv) :
 	RR(renv),
 	_readPtr(0),
 	_writePtr(0),
+	_waiting(0),
 	_die(false)
 {
 }
@@ -45,8 +46,11 @@ DeferredPackets::~DeferredPackets()
 {
 	_q_m.lock();
 	_die = true;
-	_q_m.unlock();
-	_q_s.post();
+	while (_waiting > 0) {
+		_q_m.unlock();
+		_q_s.post();
+		_q_m.lock();
+	}
 }
 
 bool DeferredPackets::enqueue(IncomingPacket *pkt)
@@ -72,16 +76,16 @@ int DeferredPackets::process()
 	_q_m.lock();
 	if (_die) {
 		_q_m.unlock();
-		_q_s.post();
 		return -1;
 	}
 	while (_readPtr == _writePtr) {
+		++_waiting;
 		_q_m.unlock();
 		_q_s.wait();
 		_q_m.lock();
+		--_waiting;
 		if (_die) {
 			_q_m.unlock();
-			_q_s.post();
 			return -1;
 		}
 	}

node/DeferredPackets.hpp

@@ -88,7 +88,8 @@ private:
 	const RuntimeEnvironment *const RR;
 	unsigned long _readPtr;
 	unsigned long _writePtr;
-	bool _die;
+ 	volatile int _waiting;
+	volatile bool _die;
 	Mutex _q_m;
 	BinarySemaphore _q_s;
 };

node/RuntimeEnvironment.hpp

@@ -66,7 +66,7 @@ public:
 #ifdef ZT_ENABLE_CLUSTER
 		,cluster((Cluster *)0)
 #endif
-		,dpEnabled(false)
+		,dpEnabled(0)
 	{
 	}