celeritas::GeantSd::ProcessorSlotDeleter Struct Reference

Clear a slot's cached pointers when its hit processor is destroyed. More...

Public Member Functions
void	operator() (HitProcessor *processor) const

Public Attributes
std::weak_ptr< ProcessorSlot >	weak_slot

Detailed Description

Clear a slot's cached pointers when its hit processor is destroyed.

The references between the slot and the processor are cyclic and deliberately non-owning in both directions:

GeantSd --(shared)--> ProcessorSlot --(weak + raw cache)--> HitProcessor
                            ^                                    |
                            +--(weak, via this deleter)----------+

LocalTransporter --(shared, with this deleter)--> HitProcessor

The thread-local transporter shares ownership of the processor, and GeantSd owns the slot. Since the cross references are weak, either side may be destroyed first:

• when the last local reference to the processor is released (on the worker thread that created it), this deleter resets the slot's cached pointers so a later make_local_processor call recreates the processor instead of returning a dangling pointer;
• when the GeantSd (and thus the slot) is destroyed first, locking the weak pointer fails and only the processor is deleted.

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The documentation for this struct was generated from the following file:

• GeantSd.cc