Mirror/FairMQ
1
0
Fork 0
mirror of https://github.com/FairRootGroup/FairMQ.git synced 2025-10-15 09:31:45 +00:00
Code Issues Packages Projects Releases Wiki Activity

shmem region subscriptions: fix race condition

Browse Source
This commit is contained in:
Alexey Rybalchenko
2020-05-10 12:21:59 +02:00
parent a3afadb824
commit 59e32437a2
2 changed files with 16 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
fairmq/shmem/Manager.cxx
View File

@@ -233,31 +233,37 @@ vector<fair::mq::RegionInfo> Manager::GetRegionInfoUnsafe()
void Manager::SubscribeToRegionEvents(RegionEventCallback callback)
{
bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
if (fRegionEventThread.joinable()) {
fRegionEventsSubscriptionActive.store(false);
LOG(debug) << "Already subscribed. Overwriting previous subscription.";
bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
fRegionEventsSubscriptionActive = false;
lock.unlock();
fRegionEventsCV.notify_all();
fRegionEventThread.join();
}
bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
fRegionEventCallback = callback;
fRegionEventsSubscriptionActive.store(true);
fRegionEventsSubscriptionActive = true;
fRegionEventThread = thread(&Manager::RegionEventsSubscription, this);
}
void Manager::UnsubscribeFromRegionEvents()
{
if (fRegionEventThread.joinable()) {
fRegionEventsSubscriptionActive.store(false);
bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
fRegionEventsSubscriptionActive = false;
lock.unlock();
fRegionEventsCV.notify_all();
fRegionEventThread.join();
lock.lock();
fRegionEventCallback = nullptr;
}
bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
fRegionEventCallback = nullptr;
}
void Manager::RegionEventsSubscription()
{
while (fRegionEventsSubscriptionActive.load()) {
bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
while (fRegionEventsSubscriptionActive) {
auto infos = GetRegionInfoUnsafe();
for (const auto& i : infos) {
auto el = fObservedRegionEvents.find(i.id);
@@ -298,11 +304,7 @@ Manager::~Manager()
{
bool lastRemoved = false;
if (fRegionEventThread.joinable()) {
fRegionEventsSubscriptionActive.store(false);
fRegionEventsCV.notify_all();
fRegionEventThread.join();
}
UnsubscribeFromRegionEvents();
try {
bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);