Fix the crash on startup if instances are created before the instance

tracking is initialized.

src/cpp/ripple/InstanceCounter.cpp

@@ -1,6 +1,7 @@
 #include "InstanceCounter.h"
 
 InstanceType* InstanceType::sHeadInstance = NULL;
+bool InstanceType::sMultiThreaded = false;
 
 std::vector<InstanceType::InstanceCount> InstanceType::getInstanceCounts(int min)
 {

src/cpp/ripple/InstanceCounter.h

@@ -32,6 +32,7 @@ protected:
 
 	InstanceType*			mNextInstance;
 	static InstanceType*	sHeadInstance;
+	static bool				sMultiThreaded;
 
 public:
 	typedef std::pair<std::string, int> InstanceCount;
@@ -42,18 +43,33 @@ public:
 		sHeadInstance = this;
 	}
 
+	static void multiThread()
+	{
+		// We can support global objects and multi-threaded code, but not both
+		// at the same time. Switch to multi-threaded.
+		sMultiThreaded = true;
+	}
+
 	void addInstance()
+	{
+		if (sMultiThreaded)
 		{
 			mLock.lock();
 			++mInstances;
 			mLock.unlock();
 		}
+		else ++mInstances;
+	}
 	void decInstance()
+	{
+		if (sMultiThreaded)
 		{
 			mLock.lock();
 			--mInstances;
 			mLock.unlock();
 		}
+		else --mInstances;
+	}
 	int getCount()
 	{
 		boost::mutex::scoped_lock(mLock);

src/cpp/ripple/main.cpp

@@ -145,6 +145,7 @@ int main(int argc, char* argv[])
 		Log::setMinSeverity(lsTRACE, true);
 	else
 		Log::setMinSeverity(lsWARNING, true);
+	InstanceType::multiThread();
 
 	if (vm.count("test"))
 	{