c413203ec8
of pages, so it doesn't suggest ones that aren't already in the buffer pool unless it has to.
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/**
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@file
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Allocates and deallocates records.
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@todo Talloc() should reuse space freed by Tdealloc(), but
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currently just leaks it.
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@ingroup OPERATIONS
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$Id$
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*/
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#ifndef __ALLOC_H
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#define __ALLOC_H 1
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Operation getAlloc();
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Operation getDealloc();
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Operation getRealloc();
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Operation getInitializePage();
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void allocTransactionAbort(int xid);
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void allocTransactionCommit(int xid);
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void TallocInit();
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/**
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Allocate a record.
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@param xid The transaction responsible for the allocation
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@param size The size of the new record to be allocated. Talloc will allocate a
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blob if the record will not easily fit on a page.
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@todo need to obtain (transaction-level) write locks _before_ writing log entries. Otherwise, we can deadlock at recovery.
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@return the recordid of the new record.
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*/
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compensated_function recordid Talloc(int xid, unsigned long size);
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compensated_function recordid TallocFromPage(int xid, long page, unsigned long size);
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/**
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Free a record.
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@todo Currently, we just leak store space on dealloc.
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*/
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compensated_function void Tdealloc(int xid, recordid rid);
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/**
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Obtain the type of a record, as returned by getRecordType.
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@param xid the transaction id.
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@param rid the record of interest. The size field will be ignored,
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allowing this function to be used to probe for records in pages.
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@return UNINITIALIZED_RECORD, BLOB_RECORD, SLOTTED_RECORD, or FIXED_RECORD.
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@see getRecordType
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*/
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compensated_function int TrecordType(int xid, recordid rid);
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/**
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Obtain the length of the data stored in a record.
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@param xid the transaction id.
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@param rid the record of interest. The size field will be ignored,
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allowing this function to be used to probe for records in pages.
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@return -1 if the record does not exist, the size of the record otherwise.
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*/
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compensated_function int TrecordSize(int xid, recordid rid);
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/** Return the number of records stored in page pageid */
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compensated_function int TrecordsInPage(int xid, int pageid);
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compensated_function void TinitializeSlottedPage(int xid, int pageid);
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compensated_function void TinitializeFixedPage(int xid, int pageid, int slotLength);
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#endif
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