// Copyright 2021 The Pigweed Authors
//
// Licensed 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
//
//     https://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.
#pragma once

#include <mutex>

#include "pw_assert/assert.h"
#include "pw_interrupt/context.h"
#include "pw_sync/thread_notification.h"
#include "tx_api.h"

namespace pw::sync {

inline ThreadNotification::ThreadNotification()
    : native_type_{
          .blocked_thread = nullptr,
          .notified = false,
      } {}

inline ThreadNotification::~ThreadNotification() = default;

inline bool ThreadNotification::try_acquire() {
  // Enforce the pw::sync::ThreadNotification IRQ contract.
  PW_DASSERT(!interrupt::InInterruptContext());
  {
    std::lock_guard lock(backend::thread_notification_isl);
    const bool notified = native_type_.notified;
    native_type_.notified = false;
    return notified;
  }
}

inline void ThreadNotification::release() {
  std::lock_guard lock(backend::thread_notification_isl);
  if (native_type_.blocked_thread != nullptr) {
    PW_ASSERT(tx_thread_wait_abort(native_type_.blocked_thread) == TX_SUCCESS);
    native_type_.blocked_thread = nullptr;
  }
  native_type_.notified = true;
}

inline ThreadNotification::native_handle_type
ThreadNotification::native_handle() {
  return native_type_;
}

}  // namespace pw::sync