Inline class with BLocker interface wrapping a recursive_lock. Could probably

moved to headers/private/kernel/util.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29409 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/userlandfs/shared/RecursiveLock.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2009, Ingo Weinhold, ingo_weinhold@gmx.de.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef	_USERLAND_FS_RECURSIVE_LOCK_H
+#define	_USERLAND_FS_RECURSIVE_LOCK_H
+
+#include <lock.h> // private/kernel
+
+
+namespace UserlandFSUtil {
+
+
+class RecursiveLock {
+public:
+	RecursiveLock(bool benaphore_style = true)
+	{
+		recursive_lock_init(&fLock, "anonymous locker");
+	}
+
+	RecursiveLock(const char *name, bool benaphore_style = true)
+	{
+		recursive_lock_init_etc(&fLock, name, MUTEX_FLAG_CLONE_NAME);
+	}
+
+	~RecursiveLock()
+	{
+		recursive_lock_destroy(&fLock);
+	}
+
+	status_t InitCheck() const
+	{
+		return B_OK;
+	}
+
+	bool Lock(void)
+	{
+		return recursive_lock_lock(&fLock) == B_OK;
+	}
+
+	void Unlock(void)
+	{
+		recursive_lock_unlock(&fLock);
+	}
+
+	thread_id LockingThread(void) const
+	{
+		return RECURSIVE_LOCK_HOLDER(&fLock);
+	}
+
+	bool IsLocked(void) const
+	{
+		return RECURSIVE_LOCK_HOLDER(&fLock) == find_thread(NULL);
+	}
+
+	int32 CountLocks(void) const
+	{
+		int32 count = recursive_lock_get_recursion(
+			const_cast<recursive_lock*>(&fLock));
+		return count >= 0 ? count : 0;
+	}
+
+private:
+	recursive_lock	fLock;
+};
+
+
+};	// namespace UserlandFSUtil
+
+using UserlandFSUtil::RecursiveLock;
+
+#endif	// _USERLAND_FS_RECURSIVE_LOCK_H