godot/thirdparty/embree/kernels/common/alloc.cpp

// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0

#include "alloc.h"
#include "../../common/sys/thread.h"
#if defined(APPLE) && defined(__aarch64__)
#include "../../common/sys/barrier.h"
#endif

namespace embree
{
  __thread FastAllocator::ThreadLocal2* FastAllocator::thread_local_allocator2 = nullptr;
  SpinLock FastAllocator::s_thread_local_allocators_lock;
  std::vector<std::unique_ptr<FastAllocator::ThreadLocal2>> FastAllocator::s_thread_local_allocators;
   
  struct fast_allocator_regression_test : public RegressionTest
  {
    BarrierSys barrier;
    std::atomic<size_t> numFailed;
    std::unique_ptr<FastAllocator> alloc;

    fast_allocator_regression_test() 
      : RegressionTest("fast_allocator_regression_test"), numFailed(0)
    {
      registerRegressionTest(this);
    }

    static void thread_alloc(fast_allocator_regression_test* This)
    {
      FastAllocator::CachedAllocator threadalloc = This->alloc->getCachedAllocator();

      size_t* ptrs[1000];
      for (size_t j=0; j<1000; j++)
      {
        This->barrier.wait();
        for (size_t i=0; i<1000; i++) {
          ptrs[i] = (size_t*) threadalloc.malloc0(sizeof(size_t)+(i%32));
          *ptrs[i] = size_t(threadalloc.talloc0) + i;
        }
        for (size_t i=0; i<1000; i++) {
          if (*ptrs[i] != size_t(threadalloc.talloc0) + i) 
            This->numFailed++;
        }
        This->barrier.wait();
      }
    }
    
    bool run ()
    {
      alloc = make_unique(new FastAllocator(nullptr,false));
      numFailed.store(0);

      size_t numThreads = getNumberOfLogicalThreads();
      barrier.init(numThreads+1);

      /* create threads */
      std::vector<thread_t> threads;
      for (size_t i=0; i<numThreads; i++)
        threads.push_back(createThread((thread_func)thread_alloc,this));

      /* run test */ 
      for (size_t i=0; i<1000; i++)
      {
        alloc->reset();
        barrier.wait();
        barrier.wait();
      }
     
      /* destroy threads */
      for (size_t i=0; i<numThreads; i++)
        join(threads[i]);

      alloc = nullptr;

      return numFailed == 0;
    }
  };

  fast_allocator_regression_test fast_allocator_regression;
}