////////////////////////////////////////////////////////////////////////////////
//
// The University of Illinois/NCSA
// Open Source License (NCSA)
//
// Copyright (c) 2014-2020, Advanced Micro Devices, Inc. All rights reserved.
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//
//                 AMD Research and AMD HSA Software Development
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//                 Advanced Micro Devices, Inc.
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////////////////////////////////////////////////////////////////////////////////

// HSA runtime C++ interface file.

#ifndef HSA_RUNTME_CORE_INC_DEFAULT_SIGNAL_H_
#define HSA_RUNTME_CORE_INC_DEFAULT_SIGNAL_H_

#include "core/inc/runtime.h"
#include "core/inc/signal.h"
#include "core/util/utils.h"

namespace rocr {
namespace core {

/// @brief Operations for a simple pure memory based signal.
/// @brief See base class Signal.
class BusyWaitSignal : public Signal {
 public:
  /// @brief Determines if a Signal* can be safely converted to BusyWaitSignal*
  /// via static_cast.
  static __forceinline bool IsType(Signal* ptr) {
    return ptr->IsType(&rtti_id());
  }

  /// @brief See base class Signal.
  explicit BusyWaitSignal(SharedSignal* abi_block, bool enableIPC);

  // Below are various methods corresponding to the APIs, which load/store the
  // signal value or modify the existing signal value automically and with
  // specified memory ordering semantics.

  hsa_signal_value_t LoadRelaxed();

  hsa_signal_value_t LoadAcquire();

  void StoreRelaxed(hsa_signal_value_t value);

  void StoreRelease(hsa_signal_value_t value);

  hsa_signal_value_t WaitRelaxed(hsa_signal_condition_t condition,
                                 hsa_signal_value_t compare_value,
                                 uint64_t timeout, hsa_wait_state_t wait_hint);

  hsa_signal_value_t WaitAcquire(hsa_signal_condition_t condition,
                                 hsa_signal_value_t compare_value,
                                 uint64_t timeout, hsa_wait_state_t wait_hint);

  void AndRelaxed(hsa_signal_value_t value);

  void AndAcquire(hsa_signal_value_t value);

  void AndRelease(hsa_signal_value_t value);

  void AndAcqRel(hsa_signal_value_t value);

  void OrRelaxed(hsa_signal_value_t value);

  void OrAcquire(hsa_signal_value_t value);

  void OrRelease(hsa_signal_value_t value);

  void OrAcqRel(hsa_signal_value_t value);

  void XorRelaxed(hsa_signal_value_t value);

  void XorAcquire(hsa_signal_value_t value);

  void XorRelease(hsa_signal_value_t value);

  void XorAcqRel(hsa_signal_value_t value);

  void AddRelaxed(hsa_signal_value_t value);

  void AddAcquire(hsa_signal_value_t value);

  void AddRelease(hsa_signal_value_t value);

  void AddAcqRel(hsa_signal_value_t value);

  void SubRelaxed(hsa_signal_value_t value);

  void SubAcquire(hsa_signal_value_t value);

  void SubRelease(hsa_signal_value_t value);

  void SubAcqRel(hsa_signal_value_t value);

  hsa_signal_value_t ExchRelaxed(hsa_signal_value_t value);

  hsa_signal_value_t ExchAcquire(hsa_signal_value_t value);

  hsa_signal_value_t ExchRelease(hsa_signal_value_t value);

  hsa_signal_value_t ExchAcqRel(hsa_signal_value_t value);

  hsa_signal_value_t CasRelaxed(hsa_signal_value_t expected,
                                hsa_signal_value_t value);

  hsa_signal_value_t CasAcquire(hsa_signal_value_t expected,
                                hsa_signal_value_t value);

  hsa_signal_value_t CasRelease(hsa_signal_value_t expected,
                                hsa_signal_value_t value);

  hsa_signal_value_t CasAcqRel(hsa_signal_value_t expected,
                               hsa_signal_value_t value);

  /// @brief see the base class Signal
  __forceinline hsa_signal_value_t* ValueLocation() const {
    return (hsa_signal_value_t*)&signal_.value;
  }

  /// @brief see the base class Signal
  __forceinline HsaEvent* EopEvent() { return NULL; }

 protected:
  bool _IsA(rtti_t id) const { return id == &rtti_id(); }

 private:
  static __forceinline int& rtti_id() {
    static int rtti_id_ = 0;
    return rtti_id_;
  }

  DISALLOW_COPY_AND_ASSIGN(BusyWaitSignal);
};

/// @brief Simple memory only signal using a new ABI block.
class DefaultSignal : private LocalSignal, public BusyWaitSignal {
 public:
  /// @brief Determines if a Signal* can be safely converted to BusyWaitSignal*
  /// via static_cast.
  static __forceinline bool IsType(Signal* ptr) { return ptr->IsType(&rtti_id()); }

  /// @brief See base class Signal.
  explicit DefaultSignal(hsa_signal_value_t initial_value, bool enableIPC = false)
      : LocalSignal(initial_value, enableIPC), BusyWaitSignal(signal(), enableIPC) {}

 protected:
  bool _IsA(rtti_t id) const {
    if (id == &rtti_id()) return true;
    return BusyWaitSignal::_IsA(id);
  }

 private:
  static __forceinline int& rtti_id() {
    static int rtti_id_ = 0;
    return rtti_id_;
  }

  DISALLOW_COPY_AND_ASSIGN(DefaultSignal);
};

}  // namespace core
}  // namespace rocr
#endif  // header guard