ArenaBase.icc

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/*
  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id$
/**
 * @file  AthAllocators/ArenaBase.icc
 * @author scott snyder
 * @date Mar 2017
 * @brief Part of @c Arena dealing with the list of allocators.
 *        Broken out from @c Arena to avoid a dependency loop
 *        with @c ArenaHeader.
 *        Inline implementations.
 */
 
 
namespace SG {
 
 
/**
 * @brief Translate an integer index to an Allocator pointer.
 * @param i The index to look up.
 *
 * If the index isn't valid, an assertion will be tripped.
 */
inline
LockedAllocator ArenaBase::allocator (size_t i)
{
  ArenaAllocatorBase* allocbase = nullptr;
  std::mutex* m = nullptr;
  {
    lock_t l (m_mutex);
    if (i >= m_allocs.size() || (allocbase = m_allocs[i].m_alloc.get()) == nullptr) {
      allocbase = makeAllocator(i);
    }
 
    m = m_allocs[i].m_mutex.get();
 
    // Need to give up m_mutex before waiting on m; otherwise we can deadlock.
  }
 
  return LockedAllocator (allocbase, *m);
}
 
 
} // namespace SG