queue_spsc_isr.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2018 John Wellbelove
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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The above copyright notice and this permission notice shall be included in all
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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_SPSC_QUEUE_ISR_INCLUDED
#define ETL_SPSC_QUEUE_ISR_INCLUDED
 
#include "platform.h"
#include "alignment.h"
#include "integral_limits.h"
#include "memory_model.h"
#include "parameter_type.h"
#include "placement_new.h"
#include "utility.h"
 
#include <stddef.h>
 
namespace etl
{
  //***************************************************************************
  //***************************************************************************
  class queue_spsc_isr_exception : public exception
  {
  public:
 
    queue_spsc_isr_exception(string_type reason_, string_type file_name_, numeric_type line_number_)
      : exception(reason_, file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class queue_spsc_isr_empty : public queue_spsc_isr_exception
  {
  public:
 
    queue_spsc_isr_empty(string_type file_name_, numeric_type line_number_)
      : queue_spsc_isr_exception(ETL_ERROR_TEXT("queue_spsc_isr:empty", ETL_QUEUE_SPSC_ISR_FILE_ID"A"), file_name_, line_number_)
    {
    }
  };
 
  template <typename T, const size_t MEMORY_MODEL = etl::memory_model::MEMORY_MODEL_LARGE>
  class queue_spsc_isr_base
  {
  public:

    typedef typename etl::size_type_lookup<MEMORY_MODEL>::type size_type;
 
    typedef T        value_type;      
    typedef T&       reference;       
    typedef const T& const_reference; 
#if ETL_USING_CPP11
    typedef T&& rvalue_reference; 
#endif
 
    //*************************************************************************
    //*************************************************************************
    bool push_from_isr(const_reference value)
    {
      return push_implementation(value);
    }
 
#if ETL_USING_CPP11
    //*************************************************************************
    //*************************************************************************
    bool push_from_isr(rvalue_reference value)
    {
      return push_implementation(etl::move(value));
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
#if ETL_USING_CPP11 && ETL_NOT_USING_STLPORT && !defined(ETL_QUEUE_ISR_FORCE_CPP03_IMPLEMENTATION)
    template <typename... Args>
    bool emplace_from_isr(Args&&... args)
    {
      return emplace_implementation(etl::forward<Args>(args)...);
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    bool pop_from_isr(reference value)
    {
      return pop_implementation(value);
    }
 
    //*************************************************************************
    //*************************************************************************
    bool pop_from_isr()
    {
      return pop_implementation();
    }
 
    //*************************************************************************
    //*************************************************************************
    reference front_from_isr()
    {
      ETL_ASSERT_CHECK_EXTRA(!empty_from_isr(), ETL_ERROR(queue_spsc_isr_empty));
 
      return front_implementation();
    }
 
    //*************************************************************************
    //*************************************************************************
    const_reference front_from_isr() const
    {
      ETL_ASSERT_CHECK_EXTRA(!empty_from_isr(), ETL_ERROR(queue_spsc_isr_empty));
 
      return front_implementation();
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type available_from_isr() const
    {
      return MAX_SIZE - current_size;
    }
 
    //*************************************************************************
    //*************************************************************************
    void clear_from_isr()
    {
      while (pop_implementation())
      {
        // Do nothing.
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    bool empty_from_isr() const
    {
      return (current_size == 0);
    }
 
    //*************************************************************************
    //*************************************************************************
    bool full_from_isr() const
    {
      return (current_size == MAX_SIZE);
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type size_from_isr() const
    {
      return current_size;
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type capacity() const
    {
      return MAX_SIZE;
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type max_size() const
    {
      return MAX_SIZE;
    }
 
  protected:
 
    queue_spsc_isr_base(T* p_buffer_, size_type max_size_)
      : p_buffer(p_buffer_)
      , write_index(0)
      , read_index(0)
      , current_size(0)
      , MAX_SIZE(max_size_)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    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
    //*************************************************************************
    //*************************************************************************
    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_ISR_FORCE_CPP03_IMPLEMENTATION)
    //*************************************************************************
    //*************************************************************************
    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
    //*************************************************************************
    //*************************************************************************
    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;
    }
 
    //*************************************************************************
    //*************************************************************************
    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;
    }
 
    //*************************************************************************
    //*************************************************************************
    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;
    }
 
    //*************************************************************************
    //*************************************************************************
    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
 
    //*************************************************************************
    //*************************************************************************
    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;
    }
 
    //*************************************************************************
    //*************************************************************************
    reference front_implementation()
    {
      return p_buffer[read_index];
    }
 
    //*************************************************************************
    //*************************************************************************
    const_reference front_implementation() const
    {
      return p_buffer[read_index];
    }
 
    //*************************************************************************
    //*************************************************************************
    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;
    }
 
    //*************************************************************************
    //*************************************************************************
    static size_type get_next_index(size_type index, size_type maximum)
    {
      ++index;
 
      if (index == maximum) ETL_UNLIKELY
      {
        index = 0;
      }
 
      return index;
    }
 
    T*              p_buffer;     
    size_type       write_index;  
    size_type       read_index;   
    size_type       current_size; 
    const size_type MAX_SIZE;     
 
  private:
 
    //*************************************************************************
    //*************************************************************************
#if defined(ETL_POLYMORPHIC_SPSC_QUEUE_ISR) || defined(ETL_POLYMORPHIC_CONTAINERS)
 
  public:
 
    virtual ~queue_spsc_isr_base() {}
#else
 
  protected:
 
    ~queue_spsc_isr_base() {}
#endif
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename T, typename TAccess, const size_t MEMORY_MODEL = etl::memory_model::MEMORY_MODEL_LARGE>
  class iqueue_spsc_isr : public queue_spsc_isr_base<T, MEMORY_MODEL>
  {
  private:
 
    typedef queue_spsc_isr_base<T, MEMORY_MODEL> base_t;
 
  public:
 
    typedef typename base_t::value_type      value_type;      
    typedef typename base_t::reference       reference;       
    typedef typename base_t::const_reference const_reference; 
#if ETL_USING_CPP11
    typedef typename base_t::rvalue_reference rvalue_reference; 
#endif
    typedef typename base_t::size_type size_type; 
 
    //*************************************************************************
    //*************************************************************************
    bool push(const_reference value)
    {
      TAccess::lock();
 
      bool result = this->push_implementation(value);
 
      TAccess::unlock();
 
      return result;
    }
 
#if ETL_USING_CPP11
    //*************************************************************************
    //*************************************************************************
    bool push(rvalue_reference value)
    {
      TAccess::lock();
 
      bool result = this->push_implementation(etl::move(value));
 
      TAccess::unlock();
 
      return result;
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
#if ETL_USING_CPP11 && ETL_NOT_USING_STLPORT && !defined(ETL_QUEUE_ISR_FORCE_CPP03_IMPLEMENTATION)
    template <typename... Args>
    bool emplace(Args&&... args)
    {
      TAccess::lock();
 
      bool result = this->emplace_implementation(etl::forward<Args>(args)...);
 
      TAccess::unlock();
 
      return result;
    }
#else
    //*************************************************************************
    //*************************************************************************
    bool emplace()
    {
      TAccess::lock();
 
      bool result = this->emplace_implementation();
 
      TAccess::unlock();
 
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T1>
    bool emplace(const T1& value1)
    {
      TAccess::lock();
 
      bool result = this->emplace_implementation(value1);
 
      TAccess::unlock();
 
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T1, typename T2>
    bool emplace(const T1& value1, const T2& value2)
    {
      TAccess::lock();
 
      bool result = this->emplace_implementation(value1, value2);
 
      TAccess::unlock();
 
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T1, typename T2, typename T3>
    bool emplace(const T1& value1, const T2& value2, const T3& value3)
    {
      TAccess::lock();
 
      bool result = this->emplace_implementation(value1, value2, value3);
 
      TAccess::unlock();
 
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T1, typename T2, typename T3, typename T4>
    bool emplace(const T1& value1, const T2& value2, const T3& value3, const T4& value4)
    {
      TAccess::lock();
 
      bool result = this->emplace_implementation(value1, value2, value3, value4);
 
      TAccess::unlock();
 
      return result;
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    bool pop(reference value)
    {
      TAccess::lock();
 
      bool result = this->pop_implementation(value);
 
      TAccess::unlock();
 
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    bool pop()
    {
      TAccess::lock();
 
      bool result = this->pop_implementation();
 
      TAccess::unlock();
 
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    reference front()
    {
#if ETL_CHECKING_EXTRA
      TAccess::lock();
      if (!this->empty_from_isr())
      {
        reference inner_result = this->front_implementation();
        TAccess::unlock();
        return inner_result;
      }
      else
      {
        TAccess::unlock();
        ETL_ASSERT_FAIL(ETL_ERROR(queue_spsc_isr_empty));
        // fall through to return something to satisfy the compiler, even
        // though this should never be reached due to undefined behaviour.
      }
#endif
      TAccess::lock();
      reference result = this->front_implementation();
      TAccess::unlock();
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    const_reference front() const
    {
#if ETL_CHECKING_EXTRA
      TAccess::lock();
      if (!this->empty_from_isr())
      {
        const_reference inner_result = this->front_implementation();
        TAccess::unlock();
        return inner_result;
      }
      else
      {
        TAccess::unlock();
        ETL_ASSERT_FAIL(ETL_ERROR(queue_spsc_isr_empty));
        // fall through to return something to satisfy the compiler, even
        // though this should never be reached due to undefined behaviour.
      }
#endif
      TAccess::lock();
      const_reference result = this->front_implementation();
      TAccess::unlock();
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    void clear()
    {
      TAccess::lock();
 
      if ETL_IF_CONSTEXPR (etl::is_trivially_destructible<T>::value)
      {
        this->write_index  = 0;
        this->read_index   = 0;
        this->current_size = 0;
      }
      else
      {
        while (pop())
        {
          // Do nothing.
        }
      }
 
      TAccess::unlock();
    }
 
    //*************************************************************************
    //*************************************************************************
    bool empty() const
    {
      TAccess::lock();
 
      bool result = (this->current_size == 0);
 
      TAccess::unlock();
 
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    bool full() const
    {
      TAccess::lock();
 
      bool result = (this->current_size == this->MAX_SIZE);
 
      TAccess::unlock();
 
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type size() const
    {
      TAccess::lock();
 
      size_type result = this->current_size;
 
      TAccess::unlock();
 
      return result;
    }
 
    //*************************************************************************
    //*************************************************************************
    size_type available() const
    {
      TAccess::lock();
 
      size_type result = this->MAX_SIZE - this->current_size;
 
      TAccess::unlock();
 
      return result;
    }
 
  protected:
 
    //*************************************************************************
    //*************************************************************************
    iqueue_spsc_isr(T* p_buffer_, size_type max_size_)
      : base_t(p_buffer_, max_size_)
    {
    }
 
  private:
 
    // Disable copy construction and assignment.
    iqueue_spsc_isr(const iqueue_spsc_isr&) ETL_DELETE;
    iqueue_spsc_isr& operator=(const iqueue_spsc_isr&) ETL_DELETE;
 
#if ETL_USING_CPP11
    iqueue_spsc_isr(iqueue_spsc_isr&&)            = delete;
    iqueue_spsc_isr& operator=(iqueue_spsc_isr&&) = delete;
#endif
 
    TAccess access; 
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename T, size_t SIZE, typename TAccess, const size_t MEMORY_MODEL = etl::memory_model::MEMORY_MODEL_LARGE>
  class queue_spsc_isr : public etl::iqueue_spsc_isr<T, TAccess, MEMORY_MODEL>
  {
  private:
 
    typedef etl::iqueue_spsc_isr<T, TAccess, 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);
 
    //*************************************************************************
    //*************************************************************************
    queue_spsc_isr()
      : base_t(reinterpret_cast<T*>(&buffer[0]), MAX_SIZE)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    ~queue_spsc_isr()
    {
      base_t::clear();
    }
 
  private:
 
    queue_spsc_isr(const queue_spsc_isr&) ETL_DELETE;
    queue_spsc_isr& operator=(const queue_spsc_isr&) ETL_DELETE;
 
#if ETL_USING_CPP11
    queue_spsc_isr(queue_spsc_isr&&)            = delete;
    queue_spsc_isr& operator=(queue_spsc_isr&&) = delete;
#endif

    typename etl::aligned_storage<sizeof(T), etl::alignment_of<T>::value>::type buffer[MAX_SIZE];
  };
 
  template <typename T, size_t SIZE, typename TAccess, const size_t MEMORY_MODEL>
  ETL_CONSTANT typename queue_spsc_isr<T, SIZE, TAccess, MEMORY_MODEL>::size_type queue_spsc_isr<T, SIZE, TAccess, MEMORY_MODEL>::MAX_SIZE;
} // namespace etl
 
#endif