IDC_WriteHandleBase.cxx

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/*
  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
*/
 
#include "EventContainers/IDC_WriteHandleBase.h"
#include "EventContainers/IdentifiableCacheBase.h"
 
 
using namespace EventContainers;
 
 
 
IDC_WriteHandleBase::~IDC_WriteHandleBase() { ReleaseLock(); }
 
//If object has not been filled this will change state to aborted
//If object has been filled this should do nothing
void IDC_WriteHandleBase::ReleaseLock(){
   if(m_atomic==nullptr) return;
//Convenience declarations
   const void* waitstate = std::bit_cast<const void*>(IdentifiableCacheBase::INVALIDflag);
   const void* ABORTstate = std::bit_cast<const void*>(IdentifiableCacheBase::ABORTEDflag);
 
//Running code
   assert(m_atomic->load() != ABORTstate);
   //If you have got here the ptr was not set so creation is being aborted
   //The hash is being set to the aborted flag
   //I think memory ordering can be relaxed here but to be safe we will use defaults.
   m_atomic->compare_exchange_strong(waitstate, ABORTstate);
   //Notify_all to wake up any threads waiting for this hash
   m_atomic->notify_all();
 
   m_atomic = nullptr;
}
 
//Can't imagine why this would be used but this may be necessary
void IDC_WriteHandleBase::DropLock() noexcept{
   m_atomic = nullptr;
}