fsfw/contrib/fsfw_contrib/etl-20.39.4/include/etl/queue_mpmc_mutex.h

///\file

/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2018 John Wellbelove

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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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#ifndef ETL_MPMC_QUEUE_MUTEX_INCLUDED
#define ETL_MPMC_QUEUE_MUTEX_INCLUDED

#include "platform.h"
#include "mutex.h"

#if ETL_HAS_MUTEX

#include "alignment.h"
#include "parameter_type.h"
#include "memory_model.h"
#include "integral_limits.h"
#include "utility.h"
#include "placement_new.h"

#include <stddef.h>
#include <stdint.h>

namespace etl
{
  template <size_t MEMORY_MODEL = etl::memory_model::MEMORY_MODEL_LARGE>
  class queue_mpmc_mutex_base
  {
  public:

    /// The type used for determining the size of queue.
    typedef typename etl::size_type_lookup<MEMORY_MODEL>::type size_type;

    //*************************************************************************
    /// How many items can the queue hold.
    //*************************************************************************
    size_type capacity() const
    {
      return MAX_SIZE;
    }

    //*************************************************************************
    /// How many items can the queue hold.
    //*************************************************************************
    size_type max_size() const
    {
      return MAX_SIZE;
    }

  protected:

    queue_mpmc_mutex_base(size_type max_size_)
      : write_index(0),
        read_index(0),
        current_size(0),
        MAX_SIZE(max_size_)
    {
    }

    //*************************************************************************
    /// Calculate the next index.
    //*************************************************************************
    static size_type get_next_index(size_type index, size_type maximum)
    {
      ++index;

      if (index == maximum) ETL_UNLIKELY
      {
        index = 0;
      }

      return index;
    }

    size_type write_index;    ///< Where to input new data.
    size_type read_index;     ///< Where to get the oldest data.
    size_type current_size;   ///< The current size of the queue.
    const size_type MAX_SIZE; ///< The maximum number of items in the queue.

    //*************************************************************************
    /// Destructor.
    //*************************************************************************
#if defined(ETL_POLYMORPHIC_MPMC_QUEUE_MUTEX) || defined(ETL_POLYMORPHIC_CONTAINERS)
  public:
    virtual ~queue_mpmc_mutex_base()
    {
    }
#else
  protected:
    ~queue_mpmc_mutex_base()
    {
    }
#endif
  };

  //***************************************************************************
  ///\ingroup queue_mpmc
  ///\brief This is the base for all queue_mpmc_mutex's that contain a particular type.
  ///\details Normally a reference to this type will be taken from a derived queue_mpmc_mutex.
  ///\code
  /// etl::queue_mpmc_mutex<int, 10> myQueue;
  /// etl::iqueue_mpmc_mutex<int>& iQueue = myQueue;
  ///\endcode
  /// This queue supports concurrent access by one producer and one consumer.
  /// \tparam T The type of value that the queue_mpmc_mutex holds.
  //***************************************************************************
  template <typename T, const size_t MEMORY_MODEL = etl::memory_model::MEMORY_MODEL_LARGE>
  class iqueue_mpmc_mutex : public queue_mpmc_mutex_base<MEMORY_MODEL>
  {
  private:

    typedef etl::queue_mpmc_mutex_base<MEMORY_MODEL> base_t;

  public:

    typedef T                          value_type;      ///< The type stored in the queue.
    typedef T&                         reference;       ///< A reference to the type used in the queue.
    typedef const T&                   const_reference; ///< A const reference to the type used in the queue.
#if ETL_USING_CPP11
    typedef T&&                        rvalue_reference;///< An rvalue reference to the type used in the queue.
#endif
    typedef typename base_t::size_type size_type;       ///< The type used for determining the size of the queue.

    using base_t::write_index;
    using base_t::read_index;
    using base_t::current_size;
    using base_t::MAX_SIZE;
    using base_t::get_next_index;

    //*************************************************************************
    /// Push a value to the queue.
    //*************************************************************************
    bool push(const_reference value)
    {
      access.lock();

      bool result = push_implementation(value);

      access.unlock();

      return result;
    }

#if ETL_USING_CPP11
    //*************************************************************************
    /// Push a value to the queue.
    //*************************************************************************
    bool push(rvalue_reference value)
    {
      access.lock();

      bool result = push_implementation(etl::move(value));

      access.unlock();

      return result;
    }
#endif

#if ETL_USING_CPP11 && ETL_NOT_USING_STLPORT && !defined(ETL_QUEUE_MPMC_MUTEX_FORCE_CPP03_IMPLEMENTATION)
    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    /// If asserts or exceptions are enabled, throws an etl::queue_full if the queue if already full.
    //*************************************************************************
    template <typename ... Args>
    bool emplace(Args&&... args)
    {
      access.lock();

      bool result = emplace_implementation(etl::forward<Args>(args)...);

      access.unlock();

      return result;
    }
#else
    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    /// If asserts or exceptions are enabled, throws an etl::queue_full if the queue if already full.
    //*************************************************************************
    bool emplace()
    {
      access.lock();

      bool result = emplace_implementation();

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    /// If asserts or exceptions are enabled, throws an etl::queue_full if the queue if already full.
    //*************************************************************************
    template <typename T1>
    bool emplace(const T1& value1)
    {
      access.lock();

      bool result = emplace_implementation(value1);

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    /// If asserts or exceptions are enabled, throws an etl::queue_full if the queue if already full.
    //*************************************************************************
    template <typename T1, typename T2>
    bool emplace(const T1& value1, const T2& value2)
    {
      access.lock();

      bool result = emplace_implementation(value1, value2);

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    /// If asserts or exceptions are enabled, throws an etl::queue_full if the queue if already full.
    //*************************************************************************
    template <typename T1, typename T2, typename T3>
    bool emplace(const T1& value1, const T2& value2, const T3& value3)
    {
      access.lock();

      bool result = emplace_implementation(value1, value2, value3);

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    /// If asserts or exceptions are enabled, throws an etl::queue_full if the queue if already full.
    //*************************************************************************
    template <typename T1, typename T2, typename T3, typename T4>
    bool emplace(const T1& value1, const T2& value2, const T3& value3, const T4& value4)
    {
      access.lock();

      bool result = emplace_implementation(value1, value2, value3, value4);

      access.unlock();

      return result;
    }
#endif

    //*************************************************************************
    /// Pop a value from the queue.
    //*************************************************************************
    bool pop(reference value)
    {
      access.lock();

      bool result = pop_implementation(value);

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// Pop a value from the queue and discard.
    //*************************************************************************
    bool pop()
    {
      access.lock();

      bool result = pop_implementation();

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// Peek a value at the front of the queue.
    //*************************************************************************
    reference front()
    {
      access.lock();

      reference result = front_implementation();

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// Peek a value at the front of the queue.
    //*************************************************************************
    const_reference front() const
    {
      access.lock();

      const_reference result = front_implementation();

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// Clear the queue.
    //*************************************************************************
    void clear()
    {
      access.lock();

      while (pop_implementation())
      {
        // Do nothing.
      }

      access.unlock();
    }

    //*************************************************************************
    /// Is the queue empty?
    //*************************************************************************
    bool empty() const
    {
      access.lock();

      size_type result = (current_size == 0);

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// Is the queue full?
    //*************************************************************************
    bool full() const
    {
      access.lock();

      size_type result = (current_size == MAX_SIZE);

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// How many items in the queue?
    //*************************************************************************
    size_type size() const
    {
      access.lock();

      size_type result = current_size;

      access.unlock();

      return result;
    }

    //*************************************************************************
    /// How much free space available in the queue.
    //*************************************************************************
    size_type available() const
    {
      access.lock();

      size_type result = MAX_SIZE - current_size;

      access.unlock();

      return result;
    }

  protected:

    //*************************************************************************
    /// The constructor that is called from derived classes.
    //*************************************************************************
    iqueue_mpmc_mutex(T* p_buffer_, size_type max_size_)
      : base_t(max_size_),
        p_buffer(p_buffer_)
    {
    }

  private:

    //*************************************************************************
    /// Push a value to the queue.
    //*************************************************************************
    bool push_implementation(const_reference value)
    {
      if (current_size != MAX_SIZE)
      {
        ::new (&p_buffer[write_index]) T(value);

        write_index = get_next_index(write_index, MAX_SIZE);

        ++current_size;

        return true;
      }

      // Queue is full.
      return false;
    }

#if ETL_USING_CPP11 && ETL_NOT_USING_STLPORT && !defined(ETL_QUEUE_MPMC_MUTEX_FORCE_CPP03_IMPLEMENTATION)
    //*************************************************************************
    /// Push a value to the queue.
    //*************************************************************************
    bool push_implementation(rvalue_reference value)
    {
      if (current_size != MAX_SIZE)
      {
        ::new (&p_buffer[write_index]) T(etl::move(value));

        write_index = get_next_index(write_index, MAX_SIZE);

        ++current_size;

        return true;
      }

      // Queue is full.
      return false;
    }
#endif

#if ETL_USING_CPP11 && ETL_NOT_USING_STLPORT && !defined(ETL_QUEUE_MPMC_MUTEX_FORCE_CPP03_IMPLEMENTATION)
    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    //*************************************************************************
    template <typename ... Args>
    bool emplace_implementation(Args&&... args)
    {
      if (current_size != MAX_SIZE)
      {
        ::new (&p_buffer[write_index]) T(etl::forward<Args>(args)...);

        write_index = get_next_index(write_index, MAX_SIZE);

        ++current_size;

        return true;
      }

      // Queue is full.
      return false;
    }
#else
    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    //*************************************************************************
    bool emplace_implementation()
    {
      if (current_size != MAX_SIZE)
      {
        ::new (&p_buffer[write_index]) T();

        write_index = get_next_index(write_index, MAX_SIZE);

        ++current_size;

        return true;
      }

      // Queue is full.
      return false;
    }

    //*************************************************************************
    template <typename T1>
    bool emplace_implementation(const T1& value1)
    {
      if (current_size != MAX_SIZE)
      {
        ::new (&p_buffer[write_index]) T(value1);

        write_index = get_next_index(write_index, MAX_SIZE);

        ++current_size;

        return true;
      }

      // Queue is full.
      return false;
    }

    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    //*************************************************************************
    template <typename T1, typename T2>
    bool emplace_implementation(const T1& value1, const T2& value2)
    {
      if (current_size != MAX_SIZE)
      {
        ::new (&p_buffer[write_index]) T(value1, value2);

        write_index = get_next_index(write_index, MAX_SIZE);

        ++current_size;

        return true;
      }

      // Queue is full.
      return false;
    }

    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    //*************************************************************************
    template <typename T1, typename T2, typename T3>
    bool emplace_implementation(const T1& value1, const T2& value2, const T3& value3)
    {
      if (current_size != MAX_SIZE)
      {
        ::new (&p_buffer[write_index]) T(value1, value2, value3);

        write_index = get_next_index(write_index, MAX_SIZE);

        ++current_size;

        return true;
      }

      // Queue is full.
      return false;
    }

    //*************************************************************************
    /// Constructs a value in the queue 'in place'.
    //*************************************************************************
    template <typename T1, typename T2, typename T3, typename T4>
    bool emplace_implementation(const T1& value1, const T2& value2, const T3& value3, const T4& value4)
    {
      if (current_size != MAX_SIZE)
      {
        ::new (&p_buffer[write_index]) T(value1, value2, value3, value4);

        write_index = get_next_index(write_index, MAX_SIZE);

        ++current_size;

        return true;
      }

      // Queue is full.
      return false;
    }
#endif

    //*************************************************************************
    /// Pop a value from the queue.
    //*************************************************************************
    bool pop_implementation(reference value)
    {
      if (current_size == 0)
      {
        // Queue is empty
        return false;
      }

#if ETL_USING_CPP11 && ETL_NOT_USING_STLPORT && !defined(ETL_QUEUE_LOCKABLE_FORCE_CPP03_IMPLEMENTATION)
      value = etl::move(p_buffer[read_index]);
#else
      value = p_buffer[read_index];
#endif

      p_buffer[read_index].~T();

      read_index = get_next_index(read_index, MAX_SIZE);

      --current_size;

      return true;
    }

    //*************************************************************************
    /// Pop a value from the queue and discard.
    //*************************************************************************
    bool pop_implementation()
    {
      if (current_size == 0)
      {
        // Queue is empty
        return false;
      }

      p_buffer[read_index].~T();

      read_index = get_next_index(read_index, MAX_SIZE);

      --current_size;

      return true;
    }

    //*************************************************************************
    /// Peek a value at the front of the queue.
    //*************************************************************************
    reference front_implementation()
    {
      return p_buffer[read_index];
    }

    //*************************************************************************
    /// Peek a value at the front of the queue.
    //*************************************************************************
    const_reference front_implementation() const
    {
      return p_buffer[read_index];
    }

    // Disable copy construction and assignment.
    iqueue_mpmc_mutex(const iqueue_mpmc_mutex&);
    iqueue_mpmc_mutex& operator =(const iqueue_mpmc_mutex&);

    T* p_buffer; ///< The internal buffer.

    mutable etl::mutex access; ///< The object that locks/unlocks access.
  };

  //***************************************************************************
  ///\ingroup queue_mpmc
  /// A fixed capacity mpmc queue.
  /// This queue supports concurrent access by one producer and one consumer.
  /// \tparam T            The type this queue should support.
  /// \tparam SIZE         The maximum capacity of the queue.
  /// \tparam MEMORY_MODEL The memory model for the queue. Determines the type of the internal counter variables.
  //***************************************************************************
  template <typename T, size_t SIZE, const size_t MEMORY_MODEL = etl::memory_model::MEMORY_MODEL_LARGE>
  class queue_mpmc_mutex : public etl::iqueue_mpmc_mutex<T, MEMORY_MODEL>
  {
  private:

    typedef etl::iqueue_mpmc_mutex<T, MEMORY_MODEL> base_t;

  public:

    typedef typename base_t::size_type size_type;

    ETL_STATIC_ASSERT((SIZE <= etl::integral_limits<size_type>::max), "Size too large for memory model");

    static ETL_CONSTANT size_type MAX_SIZE = size_type(SIZE);

    //*************************************************************************
    /// Default constructor.
    //*************************************************************************
    queue_mpmc_mutex()
      : base_t(reinterpret_cast<T*>(&buffer[0]), MAX_SIZE)
    {
    }

    //*************************************************************************
    /// Destructor.
    //*************************************************************************
    ~queue_mpmc_mutex()
    {
      base_t::clear();
    }

  private:

    queue_mpmc_mutex(const queue_mpmc_mutex&) ETL_DELETE;
    queue_mpmc_mutex& operator = (const queue_mpmc_mutex&) ETL_DELETE;

#if ETL_USING_CPP11
    queue_mpmc_mutex(queue_mpmc_mutex&&) = delete;
    queue_mpmc_mutex& operator = (queue_mpmc_mutex&&) = delete;
#endif

    /// The uninitialised buffer of T used in the queue_mpmc_mutex.
    typename etl::aligned_storage<sizeof(T), etl::alignment_of<T>::value>::type buffer[MAX_SIZE];
  };

  template <typename T, size_t SIZE, const size_t MEMORY_MODEL>  
  ETL_CONSTANT typename queue_mpmc_mutex<T, SIZE, MEMORY_MODEL>::size_type queue_mpmc_mutex<T, SIZE, MEMORY_MODEL>::MAX_SIZE;
}

#endif
#endif