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56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* Copyright (C) 2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef _trnman_h
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#define _trnman_h
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#include "lockman.h"
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typedef uint64 TrID; /* our TrID is 6 bytes */
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typedef struct st_transaction TRN;
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/*
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trid - 6 byte transaction identifier. Assigned when a transaction
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is created. Transaction can always be identified by its trid,
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even after transaction has ended.
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short_trid - 2-byte transaction identifier, identifies a running
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transaction, is reassigned when transaction ends.
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*/
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struct st_transaction
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{
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LOCK_OWNER locks; /* must be the first! see short_trid_to_TRN() */
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LF_PINS *pins;
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TrID trid, min_read_from, commit_trid;
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TRN *next, *prev;
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/* Note! if locks.loid is 0, trn is NOT initialized */
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};
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#define SHORT_TRID_MAX 65535
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extern uint trnman_active_transactions, trnman_allocated_transactions;
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int trnman_init(void);
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void trnman_destroy(void);
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TRN *trnman_new_trn(pthread_mutex_t *mutex, pthread_cond_t *cond);
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void trnman_end_trn(TRN *trn, my_bool commit);
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#define trnman_commit_trn(T) trnman_end_trn(T, TRUE)
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#define trnman_abort_trn(T) trnman_end_trn(T, FALSE)
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void trnman_free_trn(TRN *trn);
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my_bool trnman_can_read_from(TRN *trn, TrID trid);
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#endif
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