Libraries: Move to Userland/Libraries/

Libraries/LibThread/Lock.h

@@ -1,140 +0,0 @@
-/*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- *    list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#pragma once
-
-#ifdef __serenity__
-
-#    include <AK/Assertions.h>
-#    include <AK/Atomic.h>
-#    include <AK/Types.h>
-#    include <unistd.h>
-
-namespace LibThread {
-
-class Lock {
-public:
-    Lock() { }
-    ~Lock() { }
-
-    void lock();
-    void unlock();
-
-private:
-    Atomic<pid_t> m_holder { 0 };
-    u32 m_level { 0 };
-};
-
-class Locker {
-public:
-    ALWAYS_INLINE explicit Locker(Lock& l)
-        : m_lock(l)
-    {
-        lock();
-    }
-    ALWAYS_INLINE ~Locker() { unlock(); }
-    ALWAYS_INLINE void unlock() { m_lock.unlock(); }
-    ALWAYS_INLINE void lock() { m_lock.lock(); }
-
-private:
-    Lock& m_lock;
-};
-
-ALWAYS_INLINE void Lock::lock()
-{
-    pid_t tid = gettid();
-    if (m_holder == tid) {
-        ++m_level;
-        return;
-    }
-    for (;;) {
-        int expected = 0;
-        if (m_holder.compare_exchange_strong(expected, tid, AK::memory_order_acq_rel)) {
-            m_level = 1;
-            return;
-        }
-        donate(expected);
-    }
-}
-
-inline void Lock::unlock()
-{
-    ASSERT(m_holder == gettid());
-    ASSERT(m_level);
-    if (m_level == 1)
-        m_holder.store(0, AK::memory_order_release);
-    else
-        --m_level;
-}
-
-#    define LOCKER(lock) LibThread::Locker locker(lock)
-
-template<typename T>
-class Lockable {
-public:
-    Lockable() { }
-
-    template<typename... Args>
-    Lockable(Args&&... args)
-        : m_resource(forward(args)...)
-    {
-    }
-
-    Lockable(T&& resource)
-        : m_resource(move(resource))
-    {
-    }
-    Lock& lock() { return m_lock; }
-    T& resource() { return m_resource; }
-
-    T lock_and_copy()
-    {
-        LOCKER(m_lock);
-        return m_resource;
-    }
-
-private:
-    T m_resource;
-    Lock m_lock;
-};
-
-}
-
-#else
-
-namespace LibThread {
-
-class Lock {
-public:
-    Lock() { }
-    ~Lock() { }
-};
-
-}
-
-#    define LOCKER(x)
-
-#endif