godot/thirdparty/embree/common/tasking/taskschedulertbb.h

// Copyright 2009-2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include "../sys/platform.h"
#include "../sys/alloc.h"
#include "../sys/barrier.h"
#include "../sys/thread.h"
#include "../sys/mutex.h"
#include "../sys/condition.h"
#include "../sys/ref.h"

#if defined(__WIN32__)
#  define NOMINMAX
#endif

// We need to define these to avoid implicit linkage against
// tbb_debug.lib under Windows. When removing these lines debug build
// under Windows fails.
#define __TBB_NO_IMPLICIT_LINKAGE 1
#define __TBBMALLOC_NO_IMPLICIT_LINKAGE 1
#define TBB_SUPPRESS_DEPRECATED_MESSAGES 1
#define TBB_PREVIEW_ISOLATED_TASK_GROUP 1
#include "tbb/tbb.h"
#include "tbb/parallel_sort.h"

namespace embree
{
  struct TaskScheduler
  {
    /*! initializes the task scheduler */
    static void create(size_t numThreads, bool set_affinity, bool start_threads);

    /*! destroys the task scheduler again */
    static void destroy();

    /* returns the ID of the current thread */
    static __forceinline size_t threadID()
    {
      return threadIndex();
    }

    /* returns the index (0..threadCount-1) of the current thread */
    static __forceinline size_t threadIndex()
    {
#if TBB_INTERFACE_VERSION >= 9100
      return tbb::this_task_arena::current_thread_index();
#elif TBB_INTERFACE_VERSION >= 9000
      return tbb::task_arena::current_thread_index();
#else
      return 0;
#endif
    }

    /* returns the total number of threads */
    static __forceinline size_t threadCount() {
#if TBB_INTERFACE_VERSION >= 9100
      return tbb::this_task_arena::max_concurrency();
#else
      return tbb::task_scheduler_init::default_num_threads();
#endif
    }

  };

};