uint32_t PagePoolOffsetAndEpochChunk::get_safe_offset_count(const Epoch& threshold) const {
ASSERT_ND(is_sorted());
OffsetAndEpoch dummy;
dummy.safe_epoch_ = threshold.value();
struct CompareEpoch {
bool operator() (const OffsetAndEpoch& left, const OffsetAndEpoch& right) {
return Epoch(left.safe_epoch_) < Epoch(right.safe_epoch_);
}
};
const OffsetAndEpoch* result = std::lower_bound(chunk_, chunk_ + size_, dummy, CompareEpoch());
ASSERT_ND(result);
ASSERT_ND(result - chunk_ <= size_);
return result - chunk_;
}
ErrorStack SavepointManagerPimpl::take_savepoint(Epoch new_global_durable_epoch) {
while (get_saved_durable_epoch() < new_global_durable_epoch) {
if (get_requested_durable_epoch() < new_global_durable_epoch) {
if (get_requested_durable_epoch() < new_global_durable_epoch) {
control_block_->requested_durable_epoch_ = new_global_durable_epoch.value();
control_block_->save_wakeup_.signal();
}
}
{
uint64_t demand = control_block_->save_done_event_.acquire_ticket();
if (get_saved_durable_epoch() >= new_global_durable_epoch) {
break;
}
control_block_->save_done_event_.wait(demand);
}
}
return kRetOk;
}
ErrorStack SavepointManagerPimpl::take_savepoint_after_snapshot(
snapshot::SnapshotId new_snapshot_id,
Epoch new_snapshot_epoch) {
while (get_latest_snapshot_id() != new_snapshot_id) {
{
control_block_->new_snapshot_id_ = new_snapshot_id;
control_block_->new_snapshot_epoch_ = new_snapshot_epoch.value();
control_block_->save_wakeup_.signal();
}
{
uint64_t demand = control_block_->save_done_event_.acquire_ticket();
if (get_latest_snapshot_id() != new_snapshot_id) {
control_block_->save_done_event_.wait(demand);
}
}
}
ASSERT_ND(get_latest_snapshot_id() == new_snapshot_id);
ASSERT_ND(get_latest_snapshot_epoch() == new_snapshot_epoch);
return kRetOk;
}