hot_path_helper.h File Reference

Reusable hot-path optimization patterns for concurrent map access. More...

#include <shared_mutex>

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Namespaces
namespace	kcenon
namespace	kcenon::monitoring
namespace	kcenon::monitoring::hot_path

Functions
template<typename Map , typename Key , typename CreateFn >
auto	kcenon::monitoring::hot_path::get_or_create (Map &map, std::shared_mutex &mutex, const Key &key, CreateFn create_fn) -> typename std::remove_reference< decltype(*map.begin() ->second)>::type *
template<typename Map , typename Key , typename CreateFn , typename InitFn >
auto	kcenon::monitoring::hot_path::get_or_create_with_init (Map &map, std::shared_mutex &mutex, const Key &key, CreateFn create_fn, InitFn init_fn) -> typename std::remove_reference< decltype(*map.begin() ->second)>::type *
template<typename Map , typename Key , typename CreateFn , typename UpdateFn >
auto	kcenon::monitoring::hot_path::get_or_create_and_update (Map &map, std::shared_mutex &mutex, const Key &key, CreateFn create_fn, UpdateFn update_fn) -> decltype(update_fn(*map.begin() ->second))

Detailed Description

Reusable hot-path optimization patterns for concurrent map access.

Date

2025

Provides thread-safe get-or-create patterns using double-check locking with shared_mutex for optimal read performance on hot paths.

The pattern reduces lock contention by:

1. First attempting read with shared_lock (allows concurrent readers)
2. Only acquiring exclusive write_lock when creation is necessary
3. Double-checking after write_lock to handle race conditions

Definition in file hot_path_helper.h.