void GlobalRWLock::unlockWrite(thread_db* tdbb, const bool release)
{
SET_TDBB(tdbb);
Database* dbb = tdbb->getDatabase();
Database::CheckoutLockGuard counterGuard(dbb, counterMutex);
COS_TRACE(("(%p)->unlockWrite readers(%d), blocking(%d), pendingWriters(%d), currentWriter(%d), lck_physical(%d)",
this, readers, blocking, pendingWriters, currentWriter, cachedLock->lck_physical));
currentWriter = false;
if (!lockCaching || release)
LCK_release(tdbb, cachedLock);
else if (blocking)
LCK_downgrade(tdbb, cachedLock);
blocking = false;
if (cachedLock->lck_physical < LCK_read)
invalidate(tdbb);
writerFinished.notifyAll();
COS_TRACE(("(%p)->unlockWrite end readers(%d), blocking(%d), pendingWriters(%d), currentWriter(%d), lck_physical(%d)",
this, readers, blocking, pendingWriters, currentWriter, cachedLock->lck_physical));
}
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;
}
}
int Database::SharedCounter::blockingAst(void* ast_object)
{
ValueCache* const counter = static_cast<ValueCache*>(ast_object);
fb_assert(counter && counter->lock);
Database* const dbb = counter->lock->lck_dbb;
try
{
Database::SyncGuard dsGuard(dbb, true);
ThreadContextHolder tdbb;
tdbb->setDatabase(dbb);
// tdbb->setAttachment(counter->lock->lck_attachment);
Jrd::ContextPoolHolder context(tdbb, dbb->dbb_permanent);
LCK_downgrade(tdbb, counter->lock);
}
catch (const Firebird::Exception&)
{} // no-op
return 0;
}
