/*
 * Copyright © 2019 Google, LLC
 *
 * 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 copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * 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 SOFTWARE.
 */

#ifndef INFLIGHT_LIST_H
#define INFLIGHT_LIST_H

#include <assert.h>
#include <lib/magma/magma.h>
#include <stdbool.h>
#include <stdio.h>

#include <deque>
#include <mutex>

// A convenience utility for maintaining a list of inflight command buffers,
// by reading completed buffer ids from the magma notification channel.

typedef magma_status_t (*wait_notification_channel_t)(magma_handle_t channel, int64_t timeout_ns);

typedef magma_status_t (*read_notification_channel_t)(magma_connection_t connection, void* buffer,
                                                      uint64_t buffer_size,
                                                      uint64_t* buffer_size_out,
                                                      magma_bool_t* more_data_out);

class InflightList {
  public:
   InflightList();
   ~InflightList();

   void add(uint64_t buffer_id);
   bool remove(uint64_t buffer_id);

   bool is_inflight(uint64_t buffer_id);

   void update(magma_connection_t connection);

   // Returns true if the list lock was obtained. Threadsafe.
   bool TryUpdate(magma_connection_t connection);

   // Wait for the given |buffer_id| to be removed from the inflight list. Threadsafe.
   magma_status_t WaitForBuffer(magma_connection_t connection,
                                magma_handle_t notification_channel, uint64_t buffer_id,
                                uint64_t timeout_ns);

   // Adds the given buffers to the inflight list and services the notification channel. Threadsafe.
   void AddAndUpdate(magma_connection_t connection,
                     struct magma_exec_resource* resources, uint32_t count);

 private:
   wait_notification_channel_t wait_;
   read_notification_channel_t read_;

   std::deque<uint64_t> buffers_;
   std::mutex mutex_;
   uint64_t notification_buffer[4096 / sizeof(uint64_t)];
};

#endif // INFLIGHT_LIST_H