/*

 * H.265 video codec.

 * Copyright (c) 2013-2014 struktur AG, Dirk Farin <farin@struktur.de>

 *

 * This file is part of libde265.

 *

 * libde265 is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as

 * published by the Free Software Foundation, either version 3 of

 * the License, or (at your option) any later version.

 *

 * libde265 is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with libde265.  If not, see <http://www.gnu.org/licenses/>.

 */

#ifndef DE265_THREADS_H

#define DE265_THREADS_H

#include "libde265/de265.h"

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <deque>

#include <string>

#include <atomic>

#ifndef _WIN32

#include <pthread.h>

typedef pthread_t        de265_thread;

typedef pthread_mutex_t  de265_mutex;

typedef pthread_cond_t   de265_cond;

#else // _WIN32

#if !defined(NOMINMAX)

#define NOMINMAX 1

#endif

#include <windows.h>

#include "../extra/win32cond.h"

#if _MSC_VER > 1310

#include <intrin.h>

#endif

typedef HANDLE              de265_thread;

typedef HANDLE              de265_mutex;

typedef win32_cond_t        de265_cond;

#endif  // _WIN32

#ifndef _WIN32

int  de265_thread_create(de265_thread* t, void *(*start_routine) (void *), void *arg);

#else

int  de265_thread_create(de265_thread* t, LPTHREAD_START_ROUTINE start_routine, void *arg);

#endif

void de265_thread_join(de265_thread t);

void de265_thread_destroy(de265_thread* t);

void de265_mutex_init(de265_mutex* m);

void de265_mutex_destroy(de265_mutex* m);

void de265_mutex_lock(de265_mutex* m);

void de265_mutex_unlock(de265_mutex* m);

void de265_cond_init(de265_cond* c);

void de265_cond_destroy(de265_cond* c);

void de265_cond_broadcast(de265_cond* c, de265_mutex* m);

void de265_cond_wait(de265_cond* c,de265_mutex* m);

void de265_cond_signal(de265_cond* c);

class de265_progress_lock

{

public:

  de265_progress_lock();

  ~de265_progress_lock();

  void wait_for_progress(int progress);

  void set_progress(int progress);

  void increase_progress(int progress);

  int  get_progress() const;

  void reset(int value=0) { mProgress=value; }

private:

  int mProgress;

  // private data

  de265_mutex mutex;

  de265_cond  cond;

};

class thread_task

{

public:

  thread_task() : state(Queued) { }

  virtual ~thread_task() { }

  enum { Queued, Running, Blocked, Finished } state;

  virtual void work() = 0;

  virtual std::string name() const { return "noname"; }

};

#define MAX_THREADS 32

/* TODO NOTE: When unblocking a task, we have to check first

   if there are threads waiting because of the run-count limit.

   If there are higher-priority tasks, those should be run instead

   of the just unblocked task.

 */

class thread_pool

{

 public:

  bool stopped;

  std::deque<thread_task*> tasks;  // we are not the owner

  de265_thread thread[MAX_THREADS];

  int num_threads;

  int num_threads_working;

  int ctbx[MAX_THREADS]; // the CTB the thread is working on

  int ctby[MAX_THREADS];

  de265_mutex  mutex;

  de265_cond   cond_var;

};

de265_error start_thread_pool(thread_pool* pool, int num_threads);

void        stop_thread_pool(thread_pool* pool); // do not process remaining tasks

void        add_task(thread_pool* pool, thread_task* task); // TOCO: can make thread_task const

#endif