void ShadowTree::commit(ShadowTreeCommitTransaction transaction) const {
SystraceSection s("ShadowTree::commit");
int attempts = 0;
while (true) {
attempts++;
if (tryCommit(transaction)) {
return;
}
// After multiple attempts, we failed to commit the transaction.
// Something internally went terribly wrong.
assert(attempts < 1024);
}
}
void
TPIO::refreshOldPages(page_id_t threshold, size_t pgsPerTx)
{
// rOP: refreshOldPages
//
// case 1:
// rOP s---e
// Rebase s---e
//
// no prob
//
// case 2:
// rOP s---e
// Rebase s---e s---e
//
// no prob
//
// case 3:
// rOP s-!---e
// Rebase s-----e
//
// no prob. rOP waits until rebase is done
//
// case 4:
// rOP s---e
// Rebase s-!---e
//
// rebase need to wait until rOP finishes... BAD!
//
if(m_bDuringRefresh)
{
std::cout << "already during refresh" << std::endl;
return;
}
PTNK_MEMBARRIER_COMPILER;
if(! PTNK_CAS(&m_bDuringRefresh, false, true))
{
std::cout << "already during refresh (CAS failed)" << std::endl;
return;
}
PTNK_MEMBARRIER_COMPILER;
#ifdef VERBOSE_REFRESH
std::cout << "refresh start" << std::endl << *this;
#endif
void* cursor = NULL;
do
{
unique_ptr<TPIOTxSession> tx(newTransaction());
Page pgStart(tx->readPage(tx->pgidStartPage()));
pgStart.refreshAllLeafPages(&cursor, threshold, pgsPerTx, tx.get());
#ifdef VERBOSE_REFRESH
tx->dumpStat();
#endif
if(! tryCommit(tx.get(), COMMIT_REFRESH))
{
std::cerr << "refresh ci failed!" << std::endl;
}
}
while(cursor);
PTNK_MEMBARRIER_COMPILER;
m_bDuringRefresh = false;
#ifdef VERBOSE_REFRESH
std::cout << "refresh end" << std::endl << *this;
#endif
rebase(/* force = */ true);
}
