mirror of
https://github.com/timescale/timescaledb.git
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78d36b52d4
This commit adds logic for cache pinning to handle subtxn. It also makes it easier to find cache pinning leaks. Finally, it fixes handling of cross-commit operations like VACUUM and CLUSTER. Previously, such operations incorrectly released that cache pin on the first commit even though the object was used after that.
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
#ifndef TIMESCALEDB_CACHE_H
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#define TIMESCALEDB_CACHE_H
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#include <postgres.h>
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#include <utils/memutils.h>
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#include <utils/hsearch.h>
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typedef struct CacheQuery
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{
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void *result;
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void *data;
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} CacheQuery;
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typedef struct CacheStats
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{
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long numelements;
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uint64 hits;
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uint64 misses;
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} CacheStats;
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typedef struct Cache
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{
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HASHCTL hctl;
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HTAB *htab;
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int refcount;
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const char *name;
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long numelements;
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int flags;
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CacheStats stats;
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void *(*get_key) (struct CacheQuery *);
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void *(*create_entry) (struct Cache *, CacheQuery *);
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void *(*update_entry) (struct Cache *, CacheQuery *);
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void (*pre_destroy_hook) (struct Cache *);
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bool release_on_commit; /* This should be false if doing
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* cross-commit operations like
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* CLUSTER or VACUUM */
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} Cache;
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extern void cache_init(Cache *cache);
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extern void cache_invalidate(Cache *cache);
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extern void *cache_fetch(Cache *cache, CacheQuery *ctx);
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extern bool cache_remove(Cache *cache, void *key);
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extern MemoryContext cache_memory_ctx(Cache *cache);
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extern MemoryContext cache_switch_to_memory_context(Cache *cache);
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extern Cache *cache_pin(Cache *cache);
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extern int cache_release(Cache *cache);
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extern void _cache_init(void);
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extern void _cache_fini(void);
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#endif /* TIMESCALEDB_CACHE_H */
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