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117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997, 2011 Oracle and/or its affiliates. All rights reserved.
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*
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* $Id$
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*/
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#include "db_config.h"
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#include "db_int.h"
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#include "db_cxx.h"
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#include "dbinc/cxx_int.h"
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#include "dbinc/txn.h"
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// Helper macro for simple methods that pass through to the
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// underlying C method. It may return an error or raise an exception.
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// Note this macro expects that input _argspec is an argument
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// list element (e.g., "char *arg") and that _arglist is the arguments
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// that should be passed through to the C method (e.g., "(db, arg)")
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//
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#define DBTXN_METHOD(_name, _delete, _argspec, _arglist) \
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int DbTxn::_name _argspec \
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{ \
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int ret; \
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DB_TXN *txn = unwrap(this); \
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DbEnv *dbenv = DbEnv::get_DbEnv(txn->mgrp->env->dbenv); \
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\
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ret = txn->_name _arglist; \
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/* Weird, but safe if we don't access this again. */ \
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if (_delete) { \
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/* Can't do this in the destructor. */ \
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if (parent_txn_ != NULL) \
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parent_txn_->remove_child_txn(this); \
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delete this; \
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} \
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if (!DB_RETOK_STD(ret)) \
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DB_ERROR(dbenv, "DbTxn::" # _name, ret, ON_ERROR_UNKNOWN); \
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return (ret); \
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}
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// private constructor, never called but needed by some C++ linkers
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DbTxn::DbTxn(DbTxn *ptxn)
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: imp_(0)
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{
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TAILQ_INIT(&children);
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memset(&child_entry, 0, sizeof(child_entry));
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parent_txn_ = ptxn;
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if (parent_txn_ != NULL)
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parent_txn_->add_child_txn(this);
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}
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DbTxn::DbTxn(DB_TXN *txn, DbTxn *ptxn)
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: imp_(txn)
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{
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txn->api_internal = this;
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TAILQ_INIT(&children);
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memset(&child_entry, 0, sizeof(child_entry));
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parent_txn_ = ptxn;
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if (parent_txn_ != NULL)
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parent_txn_->add_child_txn(this);
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}
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DbTxn::~DbTxn()
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{
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DbTxn *txn, *pnext;
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for(txn = TAILQ_FIRST(&children); txn != NULL;) {
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pnext = TAILQ_NEXT(txn, child_entry);
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delete txn;
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txn = pnext;
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}
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}
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DBTXN_METHOD(abort, 1, (), (txn))
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DBTXN_METHOD(commit, 1, (u_int32_t flags), (txn, flags))
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DBTXN_METHOD(discard, 1, (u_int32_t flags), (txn, flags))
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void DbTxn::remove_child_txn(DbTxn *kid)
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{
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TAILQ_REMOVE(&children, kid, child_entry);
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kid->set_parent(NULL);
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}
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void DbTxn::add_child_txn(DbTxn *kid)
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{
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TAILQ_INSERT_HEAD(&children, kid, child_entry);
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kid->set_parent(this);
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}
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u_int32_t DbTxn::id()
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{
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DB_TXN *txn;
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txn = unwrap(this);
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return (txn->id(txn)); // no error
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}
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DBTXN_METHOD(get_name, 0, (const char **namep), (txn, namep))
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DBTXN_METHOD(get_priority, 0, (u_int32_t *priorityp), (txn, priorityp))
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DBTXN_METHOD(prepare, 0, (u_int8_t *gid), (txn, gid))
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DBTXN_METHOD(set_name, 0, (const char *name), (txn, name))
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DBTXN_METHOD(set_priority, 0, (u_int32_t priority), (txn, priority))
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DBTXN_METHOD(set_timeout, 0, (db_timeout_t timeout, u_int32_t flags),
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(txn, timeout, flags))
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// static method
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DbTxn *DbTxn::wrap_DB_TXN(DB_TXN *txn)
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{
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DbTxn *wrapped_txn = get_DbTxn(txn);
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// txn may have a valid parent transaction, but here we don't care.
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// We maintain parent-kid relationship in DbTxn only to make sure
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// unresolved kids of DbTxn objects are deleted.
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return (wrapped_txn != NULL) ? wrapped_txn : new DbTxn(txn, NULL);
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}
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