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70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
/* -*- mode: C; c-basic-offset: 4 -*- */
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#ident "Copyright (c) 2007, 2008 Tokutek Inc. All rights reserved."
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/* Purpose of this file is to provide the world with everything necessary
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* to use the nested transaction logic and nothing else. No internal
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* requirements of the nested transaction logic belongs here.
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*/
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#ifndef ULE_H
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#define ULE_H
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//1 does much slower debugging
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#define ULE_DEBUG 0
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/////////////////////////////////////////////////////////////////////////////////
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// Following data structures are the unpacked format of a leafentry.
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// * ule is the unpacked leaf entry, that contains an array of unpacked
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// transaction records
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// * uxr is the unpacked transaction record
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//
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//Types of transaction records.
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enum {XR_INSERT = 1,
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XR_DELETE = 2,
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XR_PLACEHOLDER = 3};
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typedef struct { // unpacked transaction record
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u_int8_t type; // delete/insert/placeholder
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u_int32_t vallen; // number of bytes in value
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void * valp; // pointer to value (Where is value really stored?)
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TXNID xid; // transaction id
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// Note: when packing ule into a new leafentry, will need
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// to copy actual data from valp to new leafentry
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} UXR_S, *UXR;
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// Unpacked Leaf Entry is of fixed size because it's just on the
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// stack and we care about ease of access more than the memory footprint.
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typedef struct { // unpacked leaf entry
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u_int8_t num_uxrs; // how many of uxrs[] are valid
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u_int32_t keylen;
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void * keyp;
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UXR_S uxrs[MAX_TRANSACTION_RECORDS]; // uxrs[0] is outermost, uxrs[num_uxrs-1] is innermost
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} ULE_S, *ULE;
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int apply_msg_to_leafentry(BRT_MSG msg,
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LEAFENTRY old_leafentry, // NULL if there was no stored data.
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size_t *new_leafentry_memorysize,
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size_t *new_leafentry_disksize,
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LEAFENTRY *new_leafentry_p,
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OMT omt,
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struct mempool *mp,
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void **maybe_free);
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//////////////////////////////////////////////////////////////////////////////////////
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//Functions exported for test purposes only (used internally for non-test purposes).
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void le_unpack(ULE ule, LEAFENTRY le);
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int le_pack(ULE ule, // data to be packed into new leafentry
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size_t *new_leafentry_memorysize,
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size_t *new_leafentry_disksize,
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LEAFENTRY * const new_leafentry_p, // this is what this function creates
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OMT omt,
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struct mempool *mp,
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void **maybe_free);
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size_t le_memsize_from_ule (ULE ule);
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#endif // ULE_H
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