Moved work for isue 532 into it's own branch.

Foundation/src/Mutex_WIN32.cpp

@@ -15,6 +15,7 @@
 
 
 #include "Poco/Mutex_WIN32.h"
+#include "Poco/Thread.h"
 #include "Poco/Timestamp.h"
 
 
@@ -58,4 +59,97 @@ bool MutexImpl::tryLockImpl(long milliseconds)
 }
 
 
+FastMutexImpl::FastMutexImpl()
+	: _lockCount(0)
+{
+	// the fct has a boolean return value under WInnNt/2000/XP but not on Win98
+	// the return only checks if the input address of &_cs was valid, so it is safe to omit it
+	InitializeCriticalSectionAndSpinCount(&_cs, 4000);
+}
+
+
+FastMutexImpl::~FastMutexImpl()
+{
+	DeleteCriticalSection(&_cs);
+}
+
+
+void FastMutexImpl::lockImpl()
+{
+	try
+	{
+		EnterCriticalSection(&_cs);
+		++_lockCount;
+
+		if (_lockCount > 1)
+		{
+			// We're trying to go recursive so self-deadlock
+			Thread::current()->join();
+		}
+	}
+	catch (...)
+	{
+		throw SystemException("cannot lock mutex");
+	}
+}
+
+
+bool FastMutexImpl::tryLockImpl()
+{
+	try
+	{
+		if (TryEnterCriticalSection(&_cs) == 0)
+			return false;
+
+		if (_lockCount > 0)
+		{
+			// We're trying to go recursive
+			LeaveCriticalSection(&_cs);
+			return false;
+		}
+		
+		++_lockCount;
+		return true;
+	}
+	catch (...)
+	{
+	}
+	throw SystemException("cannot lock mutex");
+}
+
+
+bool FastMutexImpl::tryLockImpl(long milliseconds)
+{
+	const int sleepMillis = 5;
+	Timestamp now;
+	Timestamp::TimeDiff diff(Timestamp::TimeDiff(milliseconds)*1000);
+
+	do
+	{
+		try
+		{
+			if (TryEnterCriticalSection(&_cs) == TRUE)
+			{
+				if (_lockCount == 0)
+				{
+					++_lockCount;
+					return true;
+				}
+
+				// We're trying to go recursive
+				LeaveCriticalSection(&_cs);
+				Sleep(milliseconds);
+				return false;
+			}
+		}
+		catch (...)
+		{
+			throw SystemException("cannot lock mutex");
+		}
+		Sleep(sleepMillis);
+	} while (!now.isElapsed(diff));
+	return false;
+}
+
+
 } // namespace Poco