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diff --git a/src/VBox/Additions/haiku/SharedFolders/lock.h b/src/VBox/Additions/haiku/SharedFolders/lock.h
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+/* $Id: lock.h $ */
+/** @file
+ * Lock.h - Haiku, private locking internals.
+ */
+
+/*
+ * Copyright (C) 2012-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+/*
+ * This code is based on:
+ *
+ * VirtualBox Guest Additions for Haiku.
+ *
+ * Copyright 2008-2010, Ingo Weinhold, ingo_weinhold@gmx.de.
+ * Copyright 2002-2009, Axel Dörfler, axeld@pinc-software.de.
+ * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+#ifndef GA_INCLUDED_SRC_haiku_SharedFolders_lock_h
+#define GA_INCLUDED_SRC_haiku_SharedFolders_lock_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <OS.h>
+
+
+struct mutex_waiter;
+
+typedef struct mutex {
+ const char* name;
+ struct mutex_waiter* waiters;
+#if KDEBUG
+ thread_id holder;
+#else
+ int32 count;
+ uint16 ignore_unlock_count;
+#endif
+ uint8 flags;
+} mutex;
+
+#define MUTEX_FLAG_CLONE_NAME 0x1
+
+
+typedef struct recursive_lock {
+ mutex lock;
+#if !KDEBUG
+ thread_id holder;
+#endif
+ int recursion;
+} recursive_lock;
+
+
+struct rw_lock_waiter;
+
+typedef struct rw_lock {
+ const char* name;
+ struct rw_lock_waiter* waiters;
+ thread_id holder;
+ vint32 count;
+ int32 owner_count;
+ int16 active_readers;
+ // Only > 0 while a writer is waiting: number
+ // of active readers when the first waiting
+ // writer started waiting.
+ int16 pending_readers;
+ // Number of readers that have already
+ // incremented "count", but have not yet started
+ // to wait at the time the last writer unlocked.
+ uint32 flags;
+} rw_lock;
+
+#define RW_LOCK_WRITER_COUNT_BASE 0x10000
+
+#define RW_LOCK_FLAG_CLONE_NAME 0x1
+
+
+#if KDEBUG
+# define KDEBUG_RW_LOCK_DEBUG 0
+ // Define to 1 if you want to use ASSERT_READ_LOCKED_RW_LOCK().
+ // The rw_lock will just behave like a recursive locker then.
+# define ASSERT_LOCKED_RECURSIVE(r) \
+ { ASSERT(find_thread(NULL) == (r)->lock.holder); }
+# define ASSERT_LOCKED_MUTEX(m) { ASSERT(find_thread(NULL) == (m)->holder); }
+# define ASSERT_WRITE_LOCKED_RW_LOCK(l) \
+ { ASSERT(find_thread(NULL) == (l)->holder); }
+# if KDEBUG_RW_LOCK_DEBUG
+# define ASSERT_READ_LOCKED_RW_LOCK(l) \
+ { ASSERT(find_thread(NULL) == (l)->holder); }
+# else
+# define ASSERT_READ_LOCKED_RW_LOCK(l) do {} while (false)
+# endif
+#else
+# define ASSERT_LOCKED_RECURSIVE(r) do {} while (false)
+# define ASSERT_LOCKED_MUTEX(m) do {} while (false)
+# define ASSERT_WRITE_LOCKED_RW_LOCK(m) do {} while (false)
+# define ASSERT_READ_LOCKED_RW_LOCK(l) do {} while (false)
+#endif
+
+
+// static initializers
+#if KDEBUG
+# define MUTEX_INITIALIZER(name) { name, NULL, -1, 0 }
+# define RECURSIVE_LOCK_INITIALIZER(name) { MUTEX_INITIALIZER(name), 0 }
+#else
+# define MUTEX_INITIALIZER(name) { name, NULL, 0, 0, 0 }
+# define RECURSIVE_LOCK_INITIALIZER(name) { MUTEX_INITIALIZER(name), -1, 0 }
+#endif
+
+#define RW_LOCK_INITIALIZER(name) { name, NULL, -1, 0, 0, 0 }
+
+
+#if KDEBUG
+# define RECURSIVE_LOCK_HOLDER(recursiveLock) ((recursiveLock)->lock.holder)
+#else
+# define RECURSIVE_LOCK_HOLDER(recursiveLock) ((recursiveLock)->holder)
+#endif
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void recursive_lock_init(recursive_lock *lock, const char *name);
+ // name is *not* cloned nor freed in recursive_lock_destroy()
+extern void recursive_lock_init_etc(recursive_lock *lock, const char *name,
+ uint32 flags);
+extern void recursive_lock_destroy(recursive_lock *lock);
+extern status_t recursive_lock_lock(recursive_lock *lock);
+extern status_t recursive_lock_trylock(recursive_lock *lock);
+extern void recursive_lock_unlock(recursive_lock *lock);
+extern int32 recursive_lock_get_recursion(recursive_lock *lock);
+
+extern void rw_lock_init(rw_lock* lock, const char* name);
+ // name is *not* cloned nor freed in rw_lock_destroy()
+extern void rw_lock_init_etc(rw_lock* lock, const char* name, uint32 flags);
+extern void rw_lock_destroy(rw_lock* lock);
+extern status_t rw_lock_write_lock(rw_lock* lock);
+
+extern void mutex_init(mutex* lock, const char* name);
+ // name is *not* cloned nor freed in mutex_destroy()
+extern void mutex_init_etc(mutex* lock, const char* name, uint32 flags);
+extern void mutex_destroy(mutex* lock);
+extern status_t mutex_switch_lock(mutex* from, mutex* to);
+ // Unlocks "from" and locks "to" such that unlocking and starting to wait
+ // for the lock is atomically. I.e. if "from" guards the object "to" belongs
+ // to, the operation is safe as long as "from" is held while destroying
+ // "to".
+extern status_t mutex_switch_from_read_lock(rw_lock* from, mutex* to);
+ // Like mutex_switch_lock(), just for a switching from a read-locked
+ // rw_lock.
+
+
+// implementation private:
+
+extern status_t _rw_lock_read_lock(rw_lock* lock);
+extern status_t _rw_lock_read_lock_with_timeout(rw_lock* lock,
+ uint32 timeoutFlags, bigtime_t timeout);
+extern void _rw_lock_read_unlock(rw_lock* lock, bool threadsLocked);
+extern void _rw_lock_write_unlock(rw_lock* lock, bool threadsLocked);
+
+extern status_t _mutex_lock(mutex* lock, bool threadsLocked);
+extern void _mutex_unlock(mutex* lock, bool threadsLocked);
+extern status_t _mutex_trylock(mutex* lock);
+extern status_t _mutex_lock_with_timeout(mutex* lock, uint32 timeoutFlags,
+ bigtime_t timeout);
+
+
+static inline status_t
+rw_lock_read_lock(rw_lock* lock)
+{
+#if KDEBUG_RW_LOCK_DEBUG
+ return rw_lock_write_lock(lock);
+#else
+ int32 oldCount = atomic_add(&lock->count, 1);
+ if (oldCount >= RW_LOCK_WRITER_COUNT_BASE)
+ return _rw_lock_read_lock(lock);
+ return B_OK;
+#endif
+}
+
+
+static inline status_t
+rw_lock_read_lock_with_timeout(rw_lock* lock, uint32 timeoutFlags,
+ bigtime_t timeout)
+{
+#if KDEBUG_RW_LOCK_DEBUG
+ return mutex_lock_with_timeout(lock, timeoutFlags, timeout);
+#else
+ int32 oldCount = atomic_add(&lock->count, 1);
+ if (oldCount >= RW_LOCK_WRITER_COUNT_BASE)
+ return _rw_lock_read_lock_with_timeout(lock, timeoutFlags, timeout);
+ return B_OK;
+#endif
+}
+
+
+static inline void
+rw_lock_read_unlock(rw_lock* lock)
+{
+#if KDEBUG_RW_LOCK_DEBUG
+ rw_lock_write_unlock(lock);
+#else
+ int32 oldCount = atomic_add(&lock->count, -1);
+ if (oldCount >= RW_LOCK_WRITER_COUNT_BASE)
+ _rw_lock_read_unlock(lock, false);
+#endif
+}
+
+
+static inline void
+rw_lock_write_unlock(rw_lock* lock)
+{
+ _rw_lock_write_unlock(lock, false);
+}
+
+
+static inline status_t
+mutex_lock(mutex* lock)
+{
+#if KDEBUG
+ return _mutex_lock(lock, false);
+#else
+ if (atomic_add(&lock->count, -1) < 0)
+ return _mutex_lock(lock, false);
+ return B_OK;
+#endif
+}
+
+
+static inline status_t
+mutex_lock_threads_locked(mutex* lock)
+{
+#if KDEBUG
+ return _mutex_lock(lock, true);
+#else
+ if (atomic_add(&lock->count, -1) < 0)
+ return _mutex_lock(lock, true);
+ return B_OK;
+#endif
+}
+
+
+static inline status_t
+mutex_trylock(mutex* lock)
+{
+#if KDEBUG
+ return _mutex_trylock(lock);
+#else
+ if (atomic_test_and_set(&lock->count, -1, 0) != 0)
+ return B_WOULD_BLOCK;
+ return B_OK;
+#endif
+}
+
+
+static inline status_t
+mutex_lock_with_timeout(mutex* lock, uint32 timeoutFlags, bigtime_t timeout)
+{
+#if KDEBUG
+ return _mutex_lock_with_timeout(lock, timeoutFlags, timeout);
+#else
+ if (atomic_add(&lock->count, -1) < 0)
+ return _mutex_lock_with_timeout(lock, timeoutFlags, timeout);
+ return B_OK;
+#endif
+}
+
+
+static inline void
+mutex_unlock(mutex* lock)
+{
+#if !KDEBUG
+ if (atomic_add(&lock->count, 1) < -1)
+#endif
+ _mutex_unlock(lock, false);
+}
+
+
+static inline void
+mutex_transfer_lock(mutex* lock, thread_id thread)
+{
+#if KDEBUG
+ lock->holder = thread;
+#endif
+}
+
+
+extern void lock_debug_init();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !GA_INCLUDED_SRC_haiku_SharedFolders_lock_h */
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