ArenaHeader.icc

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id: ArenaHeader.icc 470529 2011-11-24 23:54:22Z ssnyder $
/**
 * @file  AthAllocators/ArenaHeader.icc
 * @author scott snyder
 * @date May 2007
 * @brief Proxy for a group of Arenas.
 *        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 ArenaHeader::allocator (size_t i)
{
  if (m_arena.get()) {
    return  m_arena->allocator (i);
  }
  return m_defaultArena.allocator (i);
}
 
 
/**
 * @brief Translate an integer index to an Allocator pointer.
 * @param ctx Use the Arena associated with this event context.
 * @param i The index to look up.
 *
 * If the index isn't valid, an assertion will be tripped.
 */
inline
LockedAllocator ArenaHeader::allocator (const EventContext& ctx, size_t i)
{
  ArenaBase* a = nullptr;
  size_t slot = ctx.slot();
  {
    std::lock_guard<std::mutex> lock (m_mutex);
    if (slot < m_slots.size()) {
      a = m_slots[slot];
    }
  }
  // Need to release the header lock before creating the allocator;
  // otherwise we can deadlock (ATR-28749).
  if (a) {
    return a->allocator (i);
  }
  return allocator (i);
}
 
 
} // namespace SG