74 lines
2 KiB
C
74 lines
2 KiB
C
/**
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@file
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Allocates and deallocates records.
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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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#include <stasis/operations.h>
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#include <stasis/allocationPolicy.h>
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stasis_operation_impl stasis_op_impl_alloc();
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stasis_operation_impl stasis_op_impl_dealloc();
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stasis_operation_impl stasis_op_impl_realloc();
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typedef struct stasis_alloc_t stasis_alloc_t;
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stasis_alloc_t* stasis_alloc_init(stasis_transaction_table_t * tbl, stasis_allocation_policy_t * allocPolicy);
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void stasis_alloc_post_init(stasis_alloc_t* alloc);
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void stasis_alloc_deinit(stasis_alloc_t* alloc);
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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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@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, pageid_t page, unsigned long size);
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/**
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Free a record.
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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, pageid_t page);
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#endif
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