void GlobalRWLock::blockingAstHandler(thread_db* tdbb)
{
SET_TDBB(tdbb);
COS_TRACE(("(%p)->blockingAst enter", this));
COS_TRACE(("(%p)->blockingAst readers(%d), blocking(%d), pendingWriters(%d), currentWriter(%d), lck_physical(%d)",
this, readers, blocking, pendingWriters, currentWriter, cachedLock->lck_physical));
if (!pendingLock && !currentWriter && !readers)
{
COS_TRACE(("(%p)->Downgrade lock", this));
LCK_downgrade(tdbb, cachedLock);
fb_assert(!blocking);
if (cachedLock->lck_physical < LCK_read)
invalidate(tdbb);
}
else if (!pendingLock && !currentWriter && readers && cachedLock->lck_physical > LCK_read)
{
COS_TRACE(("(%p)->Convert lock to SR ", this));
if (!LCK_convert(tdbb, cachedLock, LCK_read, LCK_NO_WAIT))
{
COS_TRACE(("(%p)->Set blocking", this));
blocking = true;
}
}
else
{
COS_TRACE(("(%p)->Set blocking", this));
blocking = true;
}
}
SLONG Database::SharedCounter::generate(thread_db* tdbb, ULONG space, ULONG prefetch)
{
fb_assert(space < TOTAL_ITEMS);
ValueCache* const counter = &m_counters[space];
if (m_localOnly)
{
SLONG result = 0;
while ( !(result = (SLONG) ++counter->curVal) )
;
return result;
}
Database* const dbb = tdbb->getDatabase();
SyncLockGuard guard(&dbb->dbb_sh_counter_sync, SYNC_EXCLUSIVE, "Database::SharedCounter::generate");
if (!counter->lock)
{
Lock* const lock =
FB_NEW_RPT(*dbb->dbb_permanent, 0) Lock(tdbb, sizeof(SLONG), LCK_shared_counter);
counter->lock = lock;
lock->lck_key.lck_long = space;
LCK_lock(tdbb, lock, LCK_PW, LCK_WAIT);
}
SLONG result = (SLONG) ++counter->curVal;
if (result > counter->maxVal)
{
LCK_convert(tdbb, counter->lock, LCK_PW, LCK_WAIT);
result = LCK_read_data(tdbb, counter->lock);
// zero IDs are somewhat special, so let's better skip them
if (!result)
result = 1;
counter->curVal = result;
counter->maxVal = result + prefetch - 1;
LCK_write_data(tdbb, counter->lock, counter->maxVal + 1);
LCK_convert(tdbb, counter->lock, LCK_SR, LCK_WAIT);
}
return result;
}
SLONG Database::SharedCounter::generate(thread_db* tdbb, ULONG space, ULONG prefetch)
{
fb_assert(space < TOTAL_ITEMS);
ValueCache* const counter = &m_counters[space];
Database* const dbb = tdbb->getDatabase();
if (!counter->lock)
{
Lock* const lock = FB_NEW_RPT(*dbb->dbb_permanent, sizeof(SLONG)) Lock();
counter->lock = lock;
lock->lck_type = LCK_shared_counter;
lock->lck_owner_handle = LCK_get_owner_handle(tdbb, lock->lck_type);
lock->lck_parent = dbb->dbb_lock;
lock->lck_length = sizeof(SLONG);
lock->lck_key.lck_long = space;
lock->lck_dbb = dbb;
lock->lck_ast = blockingAst;
lock->lck_object = counter;
LCK_lock(tdbb, lock, LCK_PW, LCK_WAIT);
counter->curVal = 1;
counter->maxVal = 0;
}
if (counter->curVal > counter->maxVal)
{
LCK_convert(tdbb, counter->lock, LCK_PW, LCK_WAIT);
counter->curVal = LCK_read_data(tdbb, counter->lock);
if (!counter->curVal)
{
// zero IDs are somewhat special, so let's better skip them
counter->curVal = 1;
}
counter->maxVal = counter->curVal + prefetch - 1;
LCK_write_data(tdbb, counter->lock, counter->maxVal + 1);
}
return counter->curVal++;
}
void CryptoManager::changeCryptState(thread_db* tdbb, const Firebird::string& plugName)
{
if (plugName.length() > 31)
{
(Arg::Gds(isc_cp_name_too_long) << Arg::Num(31)).raise();
}
bool newCryptState = plugName.hasData();
{ // window scope
Header hdr(tdbb, LCK_write);
// Check header page for flags
if (hdr->hdr_flags & Ods::hdr_crypt_process)
{
(Arg::Gds(isc_cp_process_active)).raise();
}
bool headerCryptState = hdr->hdr_flags & Ods::hdr_encrypted;
if (headerCryptState == newCryptState)
{
(Arg::Gds(isc_cp_already_crypted)).raise();
}
fb_assert(stateLock);
// Take exclusive stateLock
bool ret = needLock ? LCK_lock(tdbb, stateLock, LCK_PW, LCK_WAIT) :
LCK_convert(tdbb, stateLock, LCK_PW, LCK_WAIT);
if (!ret)
{
fb_assert(tdbb->tdbb_status_vector[1]);
ERR_punt();
}
fb_utils::init_status(tdbb->tdbb_status_vector);
needLock = false;
// Load plugin
if (newCryptState)
{
loadPlugin(plugName.c_str());
}
crypt = newCryptState;
// Write modified header page
Ods::header_page* header = hdr.write();
if (crypt)
{
header->hdr_flags |= Ods::hdr_encrypted;
plugName.copyTo(header->hdr_crypt_plugin, sizeof header->hdr_crypt_plugin);
}
else
{
header->hdr_flags &= ~Ods::hdr_encrypted;
}
header->hdr_flags |= Ods::hdr_crypt_process;
process = true;
}
// Trigger lock on ChangeCryptState
if (!LCK_convert(tdbb, stateLock, LCK_EX, LCK_WAIT))
{
ERR_punt();
}
if (!LCK_convert(tdbb, stateLock, LCK_SR, LCK_WAIT))
{
ERR_punt();
}
fb_utils::init_status(tdbb->tdbb_status_vector);
// Now we may set hdr_crypt_page for crypt thread
{ // window scope
Header hdr(tdbb, LCK_write);
Ods::header_page* header = hdr.write();
header->hdr_crypt_page = 1;
}
startCryptThread(tdbb);
}
