Initial community commit

Src/external_dependencies/openmpt-trunk/misc/mptMutex.h

@@ -0,0 +1,80 @@
+/*
+ * mptMutex.h
+ * ----------
+ * Purpose: Partially implement c++ mutexes as far as openmpt needs them. Can eventually go away when we only support c++11 compilers some time.
+ * Notes  : (currently none)
+ * Authors: OpenMPT Devs
+ * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
+ */
+
+#pragma once
+
+#include "openmpt/all/BuildSettings.hpp"
+
+#include "mpt/mutex/mutex.hpp"
+
+OPENMPT_NAMESPACE_BEGIN
+
+namespace mpt {
+
+class recursive_mutex_with_lock_count {
+
+private:
+
+	mpt::recursive_mutex mutex;
+
+#if MPT_COMPILER_MSVC
+	_Guarded_by_(mutex)
+#endif // MPT_COMPILER_MSVC
+	long lockCount;
+
+public:
+
+	recursive_mutex_with_lock_count()
+		: lockCount(0)
+	{
+		return;
+	}
+
+	~recursive_mutex_with_lock_count()
+	{
+		return;
+	}
+
+#if MPT_COMPILER_MSVC
+	_Acquires_lock_(mutex)
+#endif // MPT_COMPILER_MSVC
+	void lock()
+	{
+		mutex.lock();
+		lockCount++;
+	}
+
+#if MPT_COMPILER_MSVC
+	_Requires_lock_held_(mutex) _Releases_lock_(mutex)
+#endif // MPT_COMPILER_MSVC
+	void unlock()
+	{
+		lockCount--;
+		mutex.unlock();
+	}
+
+public:
+
+	bool IsLockedByCurrentThread() // DEBUGGING only
+	{
+		bool islocked = false;
+		if(mutex.try_lock())
+		{
+			islocked = (lockCount > 0);
+			mutex.unlock();
+		}
+		return islocked;
+	}
+
+};
+
+} // namespace mpt
+
+OPENMPT_NAMESPACE_END
+