// The cache itself (often a global or passed context) static GHashTable *handle_cache = NULL; static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER; This function does the actual heavy lifting – creating a handle from scratch.
pthread_mutex_unlock(&cache_lock); } The cache_lock mutex protects the hash table, but note that get_handle() releases the lock during the actual load_user_profile_from_disk() call. This is crucial to avoid blocking all threads during I/O. However, it introduces a race condition where two threads might simultaneously miss the cache and both load the same resource.
pthread_mutex_lock(&cache_lock);
pthread_mutex_unlock(&cache_lock); return profile; }
// Store in cache (use user_id as key) int *key = malloc(sizeof(int)); *key = user_id; g_hash_table_insert(handle_cache, key, new_entry);
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handle-with-cache.c
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Hua Hua Yao Long 花花遊龍
Author: Start Boa
Translator: Avigail Fayola Huang