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a8db7ebffb
Split the functions into two: one internal function to calculate the estimate, and another (two functions) to expose it as SQL functions. This is in preparation of adding new communicator implementation. With that, the SQL functions will dispatch the call to the old or new implementation depending on which is being used.
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* file_cache.h
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* Local File Cache definitions
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*
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef FILE_CACHE_h
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#define FILE_CACHE_h
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#include "neon_pgversioncompat.h"
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typedef struct FileCacheState
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{
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int32 vl_len_; /* varlena header (do not touch directly!) */
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uint32 magic;
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uint32 n_chunks;
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uint32 n_pages;
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uint16 chunk_size_log;
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BufferTag chunks[FLEXIBLE_ARRAY_MEMBER];
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/* followed by bitmap */
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} FileCacheState;
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/* GUCs */
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extern bool lfc_store_prefetch_result;
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/* functions for local file cache */
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extern void lfc_invalidate(NRelFileInfo rinfo, ForkNumber forkNum, BlockNumber nblocks);
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extern void lfc_writev(NRelFileInfo rinfo, ForkNumber forkNum,
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BlockNumber blkno, const void *const *buffers,
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BlockNumber nblocks);
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/* returns number of blocks read, with one bit set in *read for each */
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extern int lfc_readv_select(NRelFileInfo rinfo, ForkNumber forkNum,
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BlockNumber blkno, void **buffers,
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BlockNumber nblocks, bits8 *mask);
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extern bool lfc_cache_contains(NRelFileInfo rinfo, ForkNumber forkNum,
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BlockNumber blkno);
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extern int lfc_cache_containsv(NRelFileInfo rinfo, ForkNumber forkNum,
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BlockNumber blkno, int nblocks, bits8 *bitmap);
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extern void lfc_init(void);
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extern bool lfc_prefetch(NRelFileInfo rinfo, ForkNumber forknum, BlockNumber blkno,
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const void* buffer, XLogRecPtr lsn);
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extern FileCacheState* lfc_get_state(size_t max_entries);
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extern void lfc_prewarm(FileCacheState* fcs, uint32 n_workers);
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extern int32 lfc_approximate_working_set_size_seconds(time_t duration, bool reset);
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static inline bool
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lfc_read(NRelFileInfo rinfo, ForkNumber forkNum, BlockNumber blkno,
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void *buffer)
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{
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bits8 rv = 0;
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return lfc_readv_select(rinfo, forkNum, blkno, &buffer, 1, &rv) == 1;
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}
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static inline void
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lfc_write(NRelFileInfo rinfo, ForkNumber forkNum, BlockNumber blkno,
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const void *buffer)
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{
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return lfc_writev(rinfo, forkNum, blkno, &buffer, 1);
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}
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#endif /* FILE_CACHE_H */
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