/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _LOG4CXX_HELPERS_MUTEX_H
#define _LOG4CXX_HELPERS_MUTEX_H

#include <log4cxx/log4cxx.h>

#include <apr_portable.h>

#include <atomic>

extern "C" {
   struct apr_thread_mutex_t;
   struct apr_pool_t;
   struct apr_thread_rwlock_t;
}


namespace log4cxx
{
        namespace helpers
        {
                class Pool;

                class LOG4CXX_EXPORT Mutex
                {
                public:
                        Mutex(log4cxx::helpers::Pool& p);
                        Mutex(apr_pool_t* p);
                        ~Mutex();
                        apr_thread_mutex_t* getAPRMutex() const;

                private:
                        Mutex(const Mutex&);
                        Mutex& operator=(const Mutex&);
                        apr_thread_mutex_t* mutex;
                };
        } // namespace helpers
} // namespace log4cxx


#if defined(RW_MUTEX)

namespace log4cxx
{
        namespace helpers
        {
                class Pool;

                class LOG4CXX_EXPORT RWMutex
                {
                public:
                        RWMutex(log4cxx::helpers::Pool& p);
                        RWMutex(apr_pool_t* p);
                        ~RWMutex();

                        void rdLock() const;
                        void rdUnlock() const;

                        void wrLock() const;
                        void wrUnlock() const;

                private:
                        mutable std::atomic<apr_os_thread_t> id;
                        mutable unsigned count;
                        RWMutex(const RWMutex&);
                        RWMutex& operator=(const RWMutex&);
                        apr_thread_rwlock_t* mutex;
                };
        } // namespace helpers
} // namespace log4cxx

#define SHARED_MUTEX log4cxx::helpers::RWMutex

#else // no RW_MUTEX

#define SHARED_MUTEX log4cxx::helpers::Mutex

#endif // RW_MUTEX

#define SHARED_MUTEX_INIT(mutex, p) mutex(p)

#if defined(NON_BLOCKING)

namespace log4cxx
{
    namespace helpers
    {
        struct SemaphoreImpl;

        class LOG4CXX_EXPORT Semaphore
        {
            public:
                Semaphore(log4cxx::helpers::Pool& p);
                ~Semaphore();

                void await() const;
                void signalAll() const;

            private:
                Semaphore(const Semaphore&);
                Semaphore& operator=(const Semaphore&);

                SemaphoreImpl *impl;
        };
    } // namespace helpers
} // namespace log4cxx

#endif // NON_BLOCKING

#endif //_LOG4CXX_HELPERS_MUTEX_H