rand.hxx

// dawn/include/dawn/io/rand.hxx
//
// SPDX-License-Identifier: Apache-2.0
//
 
#pragma once
 
#include <mutex>
 
#include "dawn/io/common.hxx"
#include "dawn/io/timerfd.hxx"
#include "dawn/porting/config.hxx"
 
namespace dawn
{
class CIORand
  : public CIOCommon
  , public CIOTimerfd
{
public:
  enum
  {
    IO_RAND_CFG_FIRST = 0,
    IO_RAND_CFG_INTERVAL = 1, 
    IO_RAND_CFG_LAST = 31
  };
 
  explicit CIORand(CDescObject &desc)
    : CIOCommon(desc)
    , fd(-1)
    , tlen(getDtypeSize())
    , val(nullptr)
  {
  }
 
  ~CIORand() override;
 
#ifdef CONFIG_DAWN_OBJECT_HAS_NAME
  const char *getClassNameStr() const override
  {
    return "rand";
  }
#endif
 
  int doStart() override;
  int doStop() override;
  int configure() override;
  int deinit() override;
  int getDataImpl(IODataCmn &data, size_t len) override;
 
#ifdef CONFIG_DAWN_IO_NOTIFY
  int getFd() const override;
#endif
 
  size_t getDataSize() const override;
  size_t getDataDim() const override;
 
  bool isRead() const override
  {
    return true;
  };
 
  bool isWrite() const override
  {
    return false;
  };
 
  bool isNotify() const override
  {
    return true;
  };
 
  bool isBatch() const override
  {
    return false;
  };
 
  using ObjectIdHelper = CIOCommon::IOObjectIdHelper<IO_CLASS_RAND, SObjectId::DTYPE_UINT32>;
 
  constexpr static SObjectId::ObjectId objectId(SObjectId::EObjectDataType dtype,
                                                bool ts,
                                                uint16_t inst)
  {
    return ObjectIdHelper::create(dtype, ts, inst);
  }
 
  constexpr static SObjectCfg::ObjectCfgId cfgInterval(bool rw)
  {
    return SObjectCfg::objectCfg(SObjectId::OBJTYPE_IO,
                                 CIOCommon::IO_CLASS_RAND,
                                 SObjectId::DTYPE_UINT32,
                                 rw,
                                 1,
                                 IO_RAND_CFG_INTERVAL);
  }
 
private:
  int fd;      
  size_t tlen; 
  void *val;   
 
  int configureDesc(const CDescObject &desc);
};
} // Namespace dawn