void
IOInterposer::Report(IOInterposeObserver::Observation& aObservation)
{
MOZ_ASSERT(sMasterList);
if (!sMasterList) {
return;
}
PerThreadData* ptd = sThreadLocalData.get();
if (!ptd) {
// In this case the current thread is not registered with IOInterposer.
// Alternatively we could take the slow path and just lock everything if
// we're not registered. That could potentially perform poorly, though.
return;
}
sMasterList->Update(*ptd);
// Don't try to report if there's nobody listening.
if (!IOInterposer::IsObservedOperation(aObservation.ObservedOperation())) {
return;
}
ptd->CallObservers(aObservation);
}
/* static */ void IOInterposer::Report(
IOInterposeObserver::Observation& aObservation)
{
// IOInterposer::Init most be called before this method
MOZ_ASSERT(sObserverLists);
if (!sObserverLists) {
return;
}
//TODO: We only need read access here, so we should investigate the
// performance overhead involved in using some kind of shared lock.
// Work towards this end is tracked in bug #913653
AutoPRLock listLock(sObserverLists->mObserverListsLock);
// Don't try to report if there's nobody listening
if (!IOInterposer::IsObservedOperation(aObservation.ObservedOperation())) {
return;
}
// Decide which list of observers to inform
std::vector<IOInterposeObserver*>* observers = nullptr;
switch (aObservation.ObservedOperation()) {
case IOInterposeObserver::OpCreateOrOpen:
{
observers = &sObserverLists->mCreateObservers;
}
break;
case IOInterposeObserver::OpRead:
{
observers = &sObserverLists->mReadObservers;
}
break;
case IOInterposeObserver::OpWrite:
{
observers = &sObserverLists->mWriteObservers;
}
break;
case IOInterposeObserver::OpFSync:
{
observers = &sObserverLists->mFSyncObservers;
}
break;
case IOInterposeObserver::OpStat:
{
observers = &sObserverLists->mStatObservers;
}
break;
case IOInterposeObserver::OpClose:
{
observers = &sObserverLists->mCloseObservers;
}
break;
default:
{
// Invalid IO operation, see documentation comment for Report()
MOZ_ASSERT(false);
// Just ignore is in non-debug builds.
return;
}
}
MOZ_ASSERT(observers);
// Inform observers
uint32_t nObservers = observers->size();
for (uint32_t i = 0; i < nObservers; ++i) {
(*observers)[i]->Observe(aObservation);
}
}