diff --git a/examples/region/Sampler.cxx b/examples/region/Sampler.cxx
index 9a047922..c5e82366 100644
--- a/examples/region/Sampler.cxx
+++ b/examples/region/Sampler.cxx
@@ -35,6 +35,14 @@ void Sampler::InitTask()
     fMsgSize = fConfig->GetProperty<int>("msg-size");
     fMaxIterations = fConfig->GetProperty<uint64_t>("max-iterations");
 
+    fChannels.at("data").at(0).Transport()->SubscribeToRegionEvents([](FairMQRegionInfo info) {
+        LOG(warn) << ">>>" << info.event;
+        LOG(warn) << "id: " << info.id;
+        LOG(warn) << "ptr: " << info.ptr;
+        LOG(warn) << "size: " << info.size;
+        LOG(warn) << "flags: " << info.flags;
+    });
+
     fRegion = FairMQUnmanagedRegionPtr(NewUnmanagedRegionFor("data",
                                                              0,
                                                              10000000,
@@ -82,6 +90,7 @@ void Sampler::ResetTask()
         LOG(debug) << "done, still unacked: " << fNumUnackedMsgs;
     }
     fRegion.reset();
+    fChannels.at("data").at(0).Transport()->UnsubscribeFromRegionEvents();
 }
 
 Sampler::~Sampler()
diff --git a/examples/region/Sink.cxx b/examples/region/Sink.cxx
index 3163fe57..fd06b639 100644
--- a/examples/region/Sink.cxx
+++ b/examples/region/Sink.cxx
@@ -29,6 +29,13 @@ void Sink::InitTask()
 {
     // Get the fMaxIterations value from the command line options (via fConfig)
     fMaxIterations = fConfig->GetProperty<uint64_t>("max-iterations");
+    fChannels.at("data").at(0).Transport()->SubscribeToRegionEvents([](FairMQRegionInfo info) {
+        LOG(warn) << ">>>" << info.event;
+        LOG(warn) << "id: " << info.id;
+        LOG(warn) << "ptr: " << info.ptr;
+        LOG(warn) << "size: " << info.size;
+        LOG(warn) << "flags: " << info.flags;
+    });
 }
 
 void Sink::Run()
@@ -50,6 +57,11 @@ void Sink::Run()
     }
 }
 
+void Sink::ResetTask()
+{
+    fChannels.at("data").at(0).Transport()->UnsubscribeFromRegionEvents();
+}
+
 Sink::~Sink()
 {
 }
diff --git a/examples/region/Sink.h b/examples/region/Sink.h
index 7e372e7a..5eb7dd42 100644
--- a/examples/region/Sink.h
+++ b/examples/region/Sink.h
@@ -31,6 +31,7 @@ class Sink : public FairMQDevice
   protected:
     virtual void Run();
     virtual void InitTask();
+    virtual void ResetTask();
 
   private:
     uint64_t fMaxIterations;
diff --git a/examples/region/test-ex-region.sh.in b/examples/region/test-ex-region.sh.in
index e1139154..783d0a79 100755
--- a/examples/region/test-ex-region.sh.in
+++ b/examples/region/test-ex-region.sh.in
@@ -19,6 +19,7 @@ SAMPLER+=" --id sampler1"
 SAMPLER+=" --transport $transport"
 SAMPLER+=" --severity debug"
 SAMPLER+=" --session $SESSION"
+SAMPLER+=" --verbosity veryhigh"
 SAMPLER+=" --control static --color false"
 SAMPLER+=" --max-iterations 1"
 SAMPLER+=" --msg-size $msgSize"
diff --git a/fairmq/CMakeLists.txt b/fairmq/CMakeLists.txt
index 878f4619..e3136be5 100644
--- a/fairmq/CMakeLists.txt
+++ b/fairmq/CMakeLists.txt
@@ -245,7 +245,6 @@ if(BUILD_FAIRMQ)
     plugins/Control.cxx
     shmem/Message.cxx
     shmem/Poller.cxx
-    shmem/UnmanagedRegion.cxx
     shmem/Socket.cxx
     shmem/TransportFactory.cxx
     shmem/Manager.cxx
diff --git a/fairmq/FairMQChannel.h b/fairmq/FairMQChannel.h
index 8e7a927e..8054d8b5 100644
--- a/fairmq/FairMQChannel.h
+++ b/fairmq/FairMQChannel.h
@@ -340,6 +340,11 @@ class FairMQChannel
         return Transport()->CreateUnmanagedRegion(size, callback, path, flags);
     }
 
+    FairMQUnmanagedRegionPtr NewUnmanagedRegion(const size_t size, const int64_t userFlags, FairMQRegionCallback callback = nullptr, const std::string& path = "", int flags = 0)
+    {
+        return Transport()->CreateUnmanagedRegion(size, userFlags, callback, path, flags);
+    }
+
     static constexpr fair::mq::Transport DefaultTransportType = fair::mq::Transport::DEFAULT;
     static constexpr const char* DefaultTransportName = "default";
     static constexpr const char* DefaultName = "";
diff --git a/fairmq/FairMQDevice.h b/fairmq/FairMQDevice.h
index d3792594..d475d74d 100644
--- a/fairmq/FairMQDevice.h
+++ b/fairmq/FairMQDevice.h
@@ -217,17 +217,47 @@ class FairMQDevice
     }
 
     // creates unamanaged region with the default device transport
-    FairMQUnmanagedRegionPtr NewUnmanagedRegion(const size_t size, FairMQRegionCallback callback = nullptr)
+    FairMQUnmanagedRegionPtr NewUnmanagedRegion(const size_t size,
+                                                FairMQRegionCallback callback = nullptr,
+                                                const std::string& path = "",
+                                                int flags = 0)
     {
-        return Transport()->CreateUnmanagedRegion(size, callback);
+        return Transport()->CreateUnmanagedRegion(size, callback, path, flags);
+    }
+
+    // creates unamanaged region with the default device transport
+    FairMQUnmanagedRegionPtr NewUnmanagedRegion(const size_t size,
+                                                const int64_t userFlags,
+                                                FairMQRegionCallback callback = nullptr,
+                                                const std::string& path = "",
+                                                int flags = 0)
+    {
+        return Transport()->CreateUnmanagedRegion(size, userFlags, callback, path, flags);
     }
 
     // creates unmanaged region with the transport of the specified channel
-    FairMQUnmanagedRegionPtr NewUnmanagedRegionFor(const std::string& channel, int index, const size_t size, FairMQRegionCallback callback = nullptr, const std::string& path = "", int flags = 0)
+    FairMQUnmanagedRegionPtr NewUnmanagedRegionFor(const std::string& channel,
+                                                   int index,
+                                                   const size_t size,
+                                                   FairMQRegionCallback callback = nullptr,
+                                                   const std::string& path = "",
+                                                   int flags = 0)
     {
         return GetChannel(channel, index).NewUnmanagedRegion(size, callback, path, flags);
     }
 
+    // creates unmanaged region with the transport of the specified channel
+    FairMQUnmanagedRegionPtr NewUnmanagedRegionFor(const std::string& channel,
+                                                   int index,
+                                                   const size_t size,
+                                                   const int64_t userFlags,
+                                                   FairMQRegionCallback callback = nullptr,
+                                                   const std::string& path = "",
+                                                   int flags = 0)
+    {
+        return GetChannel(channel, index).NewUnmanagedRegion(size, userFlags, callback, path, flags);
+    }
+
     template<typename ...Ts>
     FairMQPollerPtr NewPoller(const Ts&... inputs)
     {
diff --git a/fairmq/FairMQTransportFactory.cxx b/fairmq/FairMQTransportFactory.cxx
index 0e6c5452..4b53a9aa 100644
--- a/fairmq/FairMQTransportFactory.cxx
+++ b/fairmq/FairMQTransportFactory.cxx
@@ -7,8 +7,8 @@
  ********************************************************************************/
 
 #include <FairMQTransportFactory.h>
-#include <zeromq/FairMQTransportFactoryZMQ.h>
 #include <fairmq/shmem/TransportFactory.h>
+#include <zeromq/FairMQTransportFactoryZMQ.h>
 #ifdef BUILD_NANOMSG_TRANSPORT
 #include <nanomsg/FairMQTransportFactoryNN.h>
 #endif /* BUILD_NANOMSG_TRANSPORT */
@@ -17,50 +17,46 @@
 #endif
 #include <FairMQLogger.h>
 #include <fairmq/tools/Unique.h>
-
 #include <memory>
 #include <string>
 
-FairMQTransportFactory::FairMQTransportFactory(const std::string& id)
+using namespace std;
+
+FairMQTransportFactory::FairMQTransportFactory(const string& id)
     : fkId(id)
-{
-}
+{}
 
-auto FairMQTransportFactory::CreateTransportFactory(const std::string& type, const std::string& id, const fair::mq::ProgOptions* config) -> std::shared_ptr<FairMQTransportFactory>
+auto FairMQTransportFactory::CreateTransportFactory(const string& type,
+                                                    const string& id,
+                                                    const fair::mq::ProgOptions* config)
+    -> shared_ptr<FairMQTransportFactory>
 {
-    using namespace std;
-
     auto finalId = id;
 
     // Generate uuid if empty
-    if (finalId == "")
-    {
+    if (finalId == "") {
         finalId = fair::mq::tools::Uuid();
     }
 
-    if (type == "zeromq")
-    {
+    if (type == "zeromq") {
         return make_shared<FairMQTransportFactoryZMQ>(finalId, config);
-    }
-    else if (type == "shmem")
-    {
+    } else if (type == "shmem") {
         return make_shared<fair::mq::shmem::TransportFactory>(finalId, config);
     }
 #ifdef BUILD_NANOMSG_TRANSPORT
-    else if (type == "nanomsg")
-    {
+    else if (type == "nanomsg") {
         return make_shared<FairMQTransportFactoryNN>(finalId, config);
     }
 #endif /* BUILD_NANOMSG_TRANSPORT */
 #ifdef BUILD_OFI_TRANSPORT
-    else if (type == "ofi")
-    {
+    else if (type == "ofi") {
         return make_shared<fair::mq::ofi::TransportFactory>(finalId, config);
     }
 #endif /* BUILD_OFI_TRANSPORT */
-    else
-    {
-        LOG(error) << "Unavailable transport requested: " << "\"" << type << "\"" << ". Available are: "
+    else {
+        LOG(error) << "Unavailable transport requested: "
+                   << "\"" << type << "\""
+                   << ". Available are: "
                    << "\"zeromq\""
                    << "\"shmem\""
 #ifdef BUILD_NANOMSG_TRANSPORT
diff --git a/fairmq/FairMQTransportFactory.h b/fairmq/FairMQTransportFactory.h
index 78e9b53b..cc5e3fa2 100644
--- a/fairmq/FairMQTransportFactory.h
+++ b/fairmq/FairMQTransportFactory.h
@@ -75,6 +75,12 @@ class FairMQTransportFactory
     virtual FairMQPollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const = 0;
 
     virtual FairMQUnmanagedRegionPtr CreateUnmanagedRegion(const size_t size, FairMQRegionCallback callback = nullptr, const std::string& path = "", int flags = 0) const = 0;
+    virtual FairMQUnmanagedRegionPtr CreateUnmanagedRegion(const size_t size, const int64_t userFlags, FairMQRegionCallback callback = nullptr, const std::string& path = "", int flags = 0) const = 0;
+
+    virtual void SubscribeToRegionEvents(FairMQRegionEventCallback callback) = 0;
+    virtual void UnsubscribeFromRegionEvents() = 0;
+
+    virtual std::vector<FairMQRegionInfo> GetRegionInfo() = 0;
 
     /// Get transport type
     virtual fair::mq::Transport GetType() const = 0;
diff --git a/fairmq/FairMQUnmanagedRegion.h b/fairmq/FairMQUnmanagedRegion.h
index 59e14f85..11d02ac1 100644
--- a/fairmq/FairMQUnmanagedRegion.h
+++ b/fairmq/FairMQUnmanagedRegion.h
@@ -12,8 +12,24 @@
 #include <cstddef> // size_t
 #include <memory> // std::unique_ptr
 #include <functional> // std::function
+#include <ostream> // std::ostream
+
+enum class FairMQRegionEvent : int
+{
+    created,
+    destroyed
+};
+
+struct FairMQRegionInfo {
+    uint64_t id;   // id of the region
+    void* ptr;     // pointer to the start of the region
+    size_t size;   // region size
+    int64_t flags; // custom flags set by the creator
+    FairMQRegionEvent event;
+};
 
 using FairMQRegionCallback = std::function<void(void*, size_t, void*)>;
+using FairMQRegionEventCallback = std::function<void(FairMQRegionInfo)>;
 
 class FairMQUnmanagedRegion
 {
@@ -26,12 +42,24 @@ class FairMQUnmanagedRegion
 
 using FairMQUnmanagedRegionPtr = std::unique_ptr<FairMQUnmanagedRegion>;
 
+inline std::ostream& operator<<(std::ostream& os, const FairMQRegionEvent& event)
+{
+    if (event == FairMQRegionEvent::created) {
+        return os << "created";
+    } else {
+        return os << "destroyed";
+    }
+}
+
 namespace fair
 {
 namespace mq
 {
 
 using RegionCallback = FairMQRegionCallback;
+using RegionEventCallback = FairMQRegionEventCallback;
+using RegionEvent = FairMQRegionEvent;
+using RegionInfo = FairMQRegionInfo;
 using UnmanagedRegion = FairMQUnmanagedRegion;
 using UnmanagedRegionPtr = FairMQUnmanagedRegionPtr;
 
diff --git a/fairmq/nanomsg/FairMQTransportFactoryNN.cxx b/fairmq/nanomsg/FairMQTransportFactoryNN.cxx
index fe13e4f5..f2f3dbb1 100644
--- a/fairmq/nanomsg/FairMQTransportFactoryNN.cxx
+++ b/fairmq/nanomsg/FairMQTransportFactoryNN.cxx
@@ -70,6 +70,11 @@ FairMQUnmanagedRegionPtr FairMQTransportFactoryNN::CreateUnmanagedRegion(const s
     return unique_ptr<FairMQUnmanagedRegion>(new FairMQUnmanagedRegionNN(size, callback, path, flags));
 }
 
+FairMQUnmanagedRegionPtr FairMQTransportFactoryNN::CreateUnmanagedRegion(const size_t size, const int64_t userFlags, FairMQRegionCallback callback, const std::string& path /* = "" */, int flags /* = 0 */) const
+{
+    return unique_ptr<FairMQUnmanagedRegion>(new FairMQUnmanagedRegionNN(size, userFlags, callback, path, flags));
+}
+
 fair::mq::Transport FairMQTransportFactoryNN::GetType() const
 {
     return fTransportType;
diff --git a/fairmq/nanomsg/FairMQTransportFactoryNN.h b/fairmq/nanomsg/FairMQTransportFactoryNN.h
index a4afa245..d573ec20 100644
--- a/fairmq/nanomsg/FairMQTransportFactoryNN.h
+++ b/fairmq/nanomsg/FairMQTransportFactoryNN.h
@@ -37,6 +37,11 @@ class FairMQTransportFactoryNN final : public FairMQTransportFactory
     FairMQPollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const override;
 
     FairMQUnmanagedRegionPtr CreateUnmanagedRegion(const size_t size, FairMQRegionCallback callback, const std::string& path = "", int flags = 0) const override;
+    FairMQUnmanagedRegionPtr CreateUnmanagedRegion(const size_t size, int64_t userFlags, FairMQRegionCallback callback = nullptr, const std::string& path = "", int flags = 0) const override;
+
+    void SubscribeToRegionEvents(FairMQRegionEventCallback /* callback */) override { LOG(error) << "SubscribeToRegionEvents not yet implemented for nanomsg"; }
+    void UnsubscribeFromRegionEvents() override { LOG(error) << "UnsubscribeFromRegionEvents not yet implemented for nanomsg"; }
+    std::vector<FairMQRegionInfo> GetRegionInfo() override { LOG(error) << "GetRegionInfo not yet implemented for nanomsg, returning empty vector"; return std::vector<FairMQRegionInfo>(); }
 
     fair::mq::Transport GetType() const override;
 
diff --git a/fairmq/nanomsg/FairMQUnmanagedRegionNN.cxx b/fairmq/nanomsg/FairMQUnmanagedRegionNN.cxx
index 4490b776..b651b6cd 100644
--- a/fairmq/nanomsg/FairMQUnmanagedRegionNN.cxx
+++ b/fairmq/nanomsg/FairMQUnmanagedRegionNN.cxx
@@ -18,6 +18,13 @@ FairMQUnmanagedRegionNN::FairMQUnmanagedRegionNN(const size_t size, FairMQRegion
 {
 }
 
+FairMQUnmanagedRegionNN::FairMQUnmanagedRegionNN(const size_t size, const int64_t /*userFlags*/, FairMQRegionCallback callback, const std::string& /*path = "" */, int /*flags = 0 */)
+    : fBuffer(malloc(size))
+    , fSize(size)
+    , fCallback(callback)
+{
+}
+
 void* FairMQUnmanagedRegionNN::GetData() const
 {
     return fBuffer;
diff --git a/fairmq/nanomsg/FairMQUnmanagedRegionNN.h b/fairmq/nanomsg/FairMQUnmanagedRegionNN.h
index 1f2da647..ca9f54de 100644
--- a/fairmq/nanomsg/FairMQUnmanagedRegionNN.h
+++ b/fairmq/nanomsg/FairMQUnmanagedRegionNN.h
@@ -20,6 +20,8 @@ class FairMQUnmanagedRegionNN final : public FairMQUnmanagedRegion
 
   public:
     FairMQUnmanagedRegionNN(const size_t size, FairMQRegionCallback callback, const std::string& path = "", int flags = 0);
+    FairMQUnmanagedRegionNN(const size_t size, const int64_t userFlags, FairMQRegionCallback callback, const std::string& path = "", int flags = 0);
+
     FairMQUnmanagedRegionNN(const FairMQUnmanagedRegionNN&) = delete;
     FairMQUnmanagedRegionNN operator=(const FairMQUnmanagedRegionNN&) = delete;
 
@@ -34,4 +36,4 @@ class FairMQUnmanagedRegionNN final : public FairMQUnmanagedRegion
     FairMQRegionCallback fCallback;
 };
 
-#endif /* FAIRMQUNMANAGEDREGIONNN_H_ */
\ No newline at end of file
+#endif /* FAIRMQUNMANAGEDREGIONNN_H_ */
diff --git a/fairmq/ofi/TransportFactory.cxx b/fairmq/ofi/TransportFactory.cxx
index 93437162..7be2ea51 100644
--- a/fairmq/ofi/TransportFactory.cxx
+++ b/fairmq/ofi/TransportFactory.cxx
@@ -90,6 +90,11 @@ auto TransportFactory::CreateUnmanagedRegion(const size_t /*size*/, FairMQRegion
     throw runtime_error{"Not yet implemented UMR."};
 }
 
+auto TransportFactory::CreateUnmanagedRegion(const size_t /*size*/, const int64_t /*userFlags*/, FairMQRegionCallback /*callback*/, const std::string& /* path = "" */, int /* flags = 0 */) const -> UnmanagedRegionPtr
+{
+    throw runtime_error{"Not yet implemented UMR."};
+}
+
 auto TransportFactory::GetType() const -> Transport
 {
     return Transport::OFI;
diff --git a/fairmq/ofi/TransportFactory.h b/fairmq/ofi/TransportFactory.h
index e183a96d..c1afe174 100644
--- a/fairmq/ofi/TransportFactory.h
+++ b/fairmq/ofi/TransportFactory.h
@@ -46,7 +46,12 @@ class TransportFactory final : public FairMQTransportFactory
     auto CreatePoller(const std::vector<FairMQChannel*>& channels) const -> PollerPtr override;
     auto CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const -> PollerPtr override;
 
-    auto CreateUnmanagedRegion(const size_t size, FairMQRegionCallback callback = nullptr, const std::string& path = "", int flags = 0) const -> UnmanagedRegionPtr override;
+    auto CreateUnmanagedRegion(const size_t size, RegionCallback callback = nullptr, const std::string& path = "", int flags = 0) const -> UnmanagedRegionPtr override;
+    auto CreateUnmanagedRegion(const size_t size, int64_t userFlags, RegionCallback callback = nullptr, const std::string& path = "", int flags = 0) const -> UnmanagedRegionPtr override;
+
+    void SubscribeToRegionEvents(RegionEventCallback /* callback */) override { LOG(error) << "SubscribeToRegionEvents not yet implemented for OFI"; }
+    void UnsubscribeFromRegionEvents() override { LOG(error) << "UnsubscribeFromRegionEvents not yet implemented for OFI"; }
+    std::vector<FairMQRegionInfo> GetRegionInfo() override { LOG(error) << "GetRegionInfo not yet implemented for OFI, returning empty vector"; return std::vector<FairMQRegionInfo>(); }
 
     auto GetType() const -> Transport override;
 
diff --git a/fairmq/shmem/Common.h b/fairmq/shmem/Common.h
index ba98b3c8..956cadf5 100644
--- a/fairmq/shmem/Common.h
+++ b/fairmq/shmem/Common.h
@@ -41,15 +41,21 @@ struct RegionInfo
     RegionInfo(const VoidAlloc& alloc)
         : fPath("", alloc)
         , fFlags(0)
+        , fUserFlags(0)
+        , fDestroyed(false)
     {}
 
-    RegionInfo(const char* path, int flags, const VoidAlloc& alloc)
+    RegionInfo(const char* path, const int flags, const uint64_t userFlags, const VoidAlloc& alloc)
         : fPath(path, alloc)
         , fFlags(flags)
+        , fUserFlags(userFlags)
+        , fDestroyed(false)
     {}
 
     Str fPath;
     int fFlags;
+    uint64_t fUserFlags;
+    bool fDestroyed;
 };
 
 using Uint64RegionInfoPairAlloc = boost::interprocess::allocator<std::pair<const uint64_t, RegionInfo>, SegmentManager>;
diff --git a/fairmq/shmem/Manager.cxx b/fairmq/shmem/Manager.cxx
index f4364f67..741e14f7 100644
--- a/fairmq/shmem/Manager.cxx
+++ b/fairmq/shmem/Manager.cxx
@@ -7,7 +7,6 @@
  ********************************************************************************/
 
 #include "Manager.h"
-#include "Common.h"
 
 #include <fairmq/tools/CppSTL.h>
 #include <fairmq/tools/Strings.h>
@@ -19,6 +18,7 @@ using namespace std;
 using bie = ::boost::interprocess::interprocess_exception;
 namespace bipc = ::boost::interprocess;
 namespace bfs = ::boost::filesystem;
+namespace bpt = ::boost::posix_time;
 
 namespace fair
 {
@@ -27,19 +27,26 @@ namespace mq
 namespace shmem
 {
 
-std::unordered_map<uint64_t, std::unique_ptr<Region>> Manager::fRegions;
-
-Manager::Manager(const std::string& id, size_t size)
+Manager::Manager(const string& id, size_t size)
     : fShmId(id)
     , fSegmentName("fmq_" + fShmId + "_main")
     , fManagementSegmentName("fmq_" + fShmId + "_mng")
     , fSegment(bipc::open_or_create, fSegmentName.c_str(), size)
-    , fManagementSegment(bipc::open_or_create, fManagementSegmentName.c_str(), 65536)
+    , fManagementSegment(bipc::open_or_create, fManagementSegmentName.c_str(), 655360)
+    , fShmVoidAlloc(fManagementSegment.get_segment_manager())
     , fShmMtx(bipc::open_or_create, string("fmq_" + fShmId + "_mtx").c_str())
+    , fRegionEventsCV(bipc::open_or_create, string("fmq_" + fShmId + "_cv").c_str())
+    , fRegionEventsSubscriptionActive(false)
     , fDeviceCounter(nullptr)
+    , fRegionInfos(nullptr)
+    , fInterrupted(false)
 {
     LOG(debug) << "created/opened shared memory segment '" << "fmq_" << fShmId << "_main" << "' of " << size << " bytes. Available are " << fSegment.get_free_memory() << " bytes.";
 
+    fRegionInfos = fManagementSegment.find_or_construct<Uint64RegionInfoMap>(bipc::unique_instance)(fShmVoidAlloc);
+    // store info about the managed segment as region with id 0
+    fRegionInfos->emplace(0, RegionInfo("", 0, 0, fShmVoidAlloc));
+
     bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
 
     fDeviceCounter = fManagementSegment.find<DeviceCounter>(bipc::unique_instance).first;
@@ -55,7 +62,7 @@ Manager::Manager(const std::string& id, size_t size)
     }
 }
 
-void Manager::StartMonitor(const std::string& id)
+void Manager::StartMonitor(const string& id)
 {
     try {
         bipc::named_mutex monitorStatus(bipc::open_only, string("fmq_" + id + "_ms").c_str());
@@ -94,47 +101,74 @@ void Manager::StartMonitor(const std::string& id)
     }
 }
 
-void Manager::Interrupt()
+pair<bipc::mapped_region*, uint64_t> Manager::CreateRegion(const size_t size, const int64_t userFlags, RegionCallback callback, const string& path /* = "" */, int flags /* = 0 */)
 {
-}
+    try {
 
-void Manager::Resume()
-{
-    // close remote regions before processing new transfers
-    for (auto it = fRegions.begin(); it != fRegions.end(); /**/) {
-        if (it->second->fRemote) {
-           it = fRegions.erase(it);
-        } else {
-            ++it;
-        }
-    }
-}
+        pair<bipc::mapped_region*, uint64_t> result;
 
-bipc::mapped_region* Manager::CreateRegion(const size_t size, const uint64_t id, RegionCallback callback, const std::string& path /* = "" */, int flags /* = 0 */)
-{
-    auto it = fRegions.find(id);
-    if (it != fRegions.end()) {
-        LOG(error) << "Trying to create a region that already exists";
-        return nullptr;
-    } else {
-        // create region info
         {
+            uint64_t id = 0;
             bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
-            VoidAlloc voidAlloc(fManagementSegment.get_segment_manager());
-            Uint64RegionInfoMap* infoMap = fManagementSegment.find_or_construct<Uint64RegionInfoMap>(bipc::unique_instance)(voidAlloc);
-            infoMap->emplace(id, RegionInfo(path.c_str(), flags, voidAlloc));
+
+            RegionCounter* rc = fManagementSegment.find<RegionCounter>(bipc::unique_instance).first;
+
+            if (rc) {
+                LOG(debug) << "region counter found, with value of " << rc->fCount << ". incrementing.";
+                (rc->fCount)++;
+                LOG(debug) << "incremented region counter, now: " << rc->fCount;
+            } else {
+                LOG(debug) << "no region counter found, creating one and initializing with 1";
+                rc = fManagementSegment.construct<RegionCounter>(bipc::unique_instance)(1);
+                LOG(debug) << "initialized region counter with: " << rc->fCount;
+            }
+
+            id = rc->fCount;
+
+            auto it = fRegions.find(id);
+            if (it != fRegions.end()) {
+                LOG(error) << "Trying to create a region that already exists";
+                return {nullptr, id};
+            }
+
+            // create region info
+            fRegionInfos->emplace(id, RegionInfo(path.c_str(), flags, userFlags, fShmVoidAlloc));
+
+            auto r = fRegions.emplace(id, tools::make_unique<Region>(*this, id, size, false, callback, path, flags));
+            // LOG(debug) << "Created region with id '" << id << "', path: '" << path << "', flags: '" << flags << "'";
+
+            r.first->second->StartReceivingAcks();
+            result.first = &(r.first->second->fRegion);
+            result.second = id;
         }
-        // LOG(debug) << "Created region with id '" << id << "', path: '" << path << "', flags: '" << flags << "'";
+        fRegionEventsCV.notify_all();
 
-        auto r = fRegions.emplace(id, tools::make_unique<Region>(*this, id, size, false, callback, path, flags));
+        return result;
 
-        r.first->second->StartReceivingAcks();
-
-        return &(r.first->second->fRegion);
+    } catch (bipc::interprocess_exception& e) {
+        LOG(error) << "cannot create region. Already created/not cleaned up?";
+        LOG(error) << e.what();
+        throw;
     }
 }
 
-Region* Manager::GetRemoteRegion(const uint64_t id)
+void Manager::RemoveRegion(const uint64_t id)
+{
+    {
+        bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
+        fRegions.erase(id);
+        fRegionInfos->at(id).fDestroyed = true;
+    }
+    fRegionEventsCV.notify_all();
+}
+
+Region* Manager::GetRegion(const uint64_t id)
+{
+    bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
+    return GetRegionUnsafe(id);
+}
+
+Region* Manager::GetRegionUnsafe(const uint64_t id)
 {
     // remote region could actually be a local one if a message originates from this device (has been sent out and returned)
     auto it = fRegions.find(id);
@@ -142,36 +176,108 @@ Region* Manager::GetRemoteRegion(const uint64_t id)
         return it->second.get();
     } else {
         try {
-            string path;
-            int flags;
-
             // get region info
-            {
-                bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
-                Uint64RegionInfoMap* infoMap = fManagementSegment.find<Uint64RegionInfoMap>(bipc::unique_instance).first;
-                if (infoMap == nullptr) {
-                    LOG(error) << "Unable to locate the region info";
-                    throw SharedMemoryError("Unable to locate remote region info");
-                }
-                RegionInfo regionInfo = infoMap->at(id);
-                path = regionInfo.fPath.c_str();
-                flags = regionInfo.fFlags;
-            }
+            RegionInfo regionInfo = fRegionInfos->at(id);
+            string path = regionInfo.fPath.c_str();
+            int flags = regionInfo.fFlags;
             // LOG(debug) << "Located remote region with id '" << id << "', path: '" << path << "', flags: '" << flags << "'";
 
             auto r = fRegions.emplace(id, tools::make_unique<Region>(*this, id, 0, true, nullptr, path, flags));
+            r.first->second->StartSendingAcks();
             return r.first->second.get();
         } catch (bie& e) {
             LOG(warn) << "Could not get remote region for id: " << id;
             return nullptr;
         }
-
     }
 }
 
-void Manager::RemoveRegion(const uint64_t id)
+vector<fair::mq::RegionInfo> Manager::GetRegionInfo()
 {
-    fRegions.erase(id);
+    bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
+    return GetRegionInfoUnsafe();
+}
+
+vector<fair::mq::RegionInfo> Manager::GetRegionInfoUnsafe()
+{
+    vector<fair::mq::RegionInfo> result;
+
+    for (const auto& e : *fRegionInfos) {
+        fair::mq::RegionInfo info;
+        info.id = e.first;
+        info.flags = e.second.fUserFlags;
+        info.event = e.second.fDestroyed ? RegionEvent::destroyed : RegionEvent::created;
+        if (info.id != 0) {
+            if (!e.second.fDestroyed) {
+                auto region = GetRegionUnsafe(info.id);
+                info.ptr = region->fRegion.get_address();
+                info.size = region->fRegion.get_size();
+            } else {
+                info.ptr = nullptr;
+                info.size = 0;
+            }
+            result.push_back(info);
+        } else {
+            if (!e.second.fDestroyed) {
+                info.ptr = fSegment.get_address();
+                info.size = fSegment.get_size();
+            } else {
+                info.ptr = nullptr;
+                info.size = 0;
+            }
+            result.push_back(info);
+        }
+    }
+
+    return result;
+}
+
+void Manager::SubscribeToRegionEvents(RegionEventCallback callback)
+{
+    bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
+    if (fRegionEventThread.joinable()) {
+        fRegionEventsSubscriptionActive.store(false);
+        fRegionEventThread.join();
+    }
+    fRegionEventCallback = callback;
+    fRegionEventsSubscriptionActive.store(true);
+    fRegionEventThread = thread(&Manager::RegionEventsSubscription, this);
+}
+
+void Manager::UnsubscribeFromRegionEvents()
+{
+    if (fRegionEventThread.joinable()) {
+        fRegionEventsSubscriptionActive.store(false);
+        fRegionEventsCV.notify_all();
+        fRegionEventThread.join();
+    }
+    bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
+    fRegionEventCallback = nullptr;
+}
+
+void Manager::RegionEventsSubscription()
+{
+    while (fRegionEventsSubscriptionActive.load()) {
+        bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
+        auto infos = GetRegionInfoUnsafe();
+        for (const auto& i : infos) {
+            auto el = fObservedRegionEvents.find(i.id);
+            if (el == fObservedRegionEvents.end()) {
+                fRegionEventCallback(i);
+                fObservedRegionEvents.emplace(i.id, i.event);
+            } else {
+                if (el->second == RegionEvent::created && i.event == RegionEvent::destroyed) {
+                    fRegionEventCallback(i);
+                    el->second = i.event;
+                } else {
+                    // LOG(debug) << "ignoring event for id" << i.id << ":";
+                    // LOG(debug) << "incoming event: " << i.event;
+                    // LOG(debug) << "stored event: " << el->second;
+                }
+            }
+        }
+        fRegionEventsCV.wait(lock);
+    }
 }
 
 void Manager::RemoveSegments()
@@ -193,6 +299,12 @@ Manager::~Manager()
 {
     bool lastRemoved = false;
 
+    if (fRegionEventThread.joinable()) {
+        fRegionEventsSubscriptionActive.store(false);
+        fRegionEventsCV.notify_all();
+        fRegionEventThread.join();
+    }
+
     try {
         bipc::scoped_lock<bipc::named_mutex> lock(fShmMtx);
 
@@ -212,6 +324,7 @@ Manager::~Manager()
 
     if (lastRemoved) {
         bipc::named_mutex::remove(string("fmq_" + fShmId + "_mtx").c_str());
+        bipc::named_condition::remove(string("fmq_" + fShmId + "_cv").c_str());
     }
 }
 
diff --git a/fairmq/shmem/Manager.h b/fairmq/shmem/Manager.h
index c9bb5e92..ccce4e85 100644
--- a/fairmq/shmem/Manager.h
+++ b/fairmq/shmem/Manager.h
@@ -15,18 +15,24 @@
 #ifndef FAIR_MQ_SHMEM_MANAGER_H_
 #define FAIR_MQ_SHMEM_MANAGER_H_
 
-#include "Region.h"
 #include "Common.h"
+#include "Region.h"
 
 #include <FairMQLogger.h>
+#include <FairMQUnmanagedRegion.h>
 
-#include <boost/interprocess/managed_shared_memory.hpp>
 #include <boost/interprocess/ipc/message_queue.hpp>
+#include <boost/interprocess/managed_shared_memory.hpp>
+#include <boost/interprocess/sync/named_condition.hpp>
 #include <boost/interprocess/sync/named_mutex.hpp>
 
-#include <string>
-#include <unordered_map>
+#include <set>
 #include <stdexcept>
+#include <string>
+#include <thread>
+#include <unordered_map>
+#include <utility>
+#include <vector>
 
 namespace fair
 {
@@ -56,17 +62,25 @@ class Manager
 
     static void StartMonitor(const std::string&);
 
-    static void Interrupt();
-    static void Resume();
+    void Interrupt() { fInterrupted.store(true); }
+    void Resume() { fInterrupted.store(false); }
+    bool Interrupted() { return fInterrupted.load(); }
 
     int GetDeviceCounter();
     int IncrementDeviceCounter();
     int DecrementDeviceCounter();
 
-    boost::interprocess::mapped_region* CreateRegion(const size_t size, const uint64_t id, RegionCallback callback, const std::string& path = "", int flags = 0);
-    Region* GetRemoteRegion(const uint64_t id);
+    std::pair<boost::interprocess::mapped_region*, uint64_t> CreateRegion(const size_t size, const int64_t userFlags, RegionCallback callback, const std::string& path = "", int flags = 0);
+    Region* GetRegion(const uint64_t id);
+    Region* GetRegionUnsafe(const uint64_t id);
     void RemoveRegion(const uint64_t id);
 
+    std::vector<fair::mq::RegionInfo> GetRegionInfo();
+    std::vector<fair::mq::RegionInfo> GetRegionInfoUnsafe();
+    void SubscribeToRegionEvents(RegionEventCallback callback);
+    void UnsubscribeFromRegionEvents();
+    void RegionEventsSubscription();
+
     void RemoveSegments();
 
   private:
@@ -75,9 +89,20 @@ class Manager
     std::string fManagementSegmentName;
     boost::interprocess::managed_shared_memory fSegment;
     boost::interprocess::managed_shared_memory fManagementSegment;
+    VoidAlloc fShmVoidAlloc;
     boost::interprocess::named_mutex fShmMtx;
+
+    boost::interprocess::named_condition fRegionEventsCV;
+    std::thread fRegionEventThread;
+    std::atomic<bool> fRegionEventsSubscriptionActive;
+    std::function<void(fair::mq::RegionInfo)> fRegionEventCallback;
+    std::unordered_map<uint64_t, RegionEvent> fObservedRegionEvents;
+
     DeviceCounter* fDeviceCounter;
-    static std::unordered_map<uint64_t, std::unique_ptr<Region>> fRegions;
+    Uint64RegionInfoMap* fRegionInfos;
+    std::unordered_map<uint64_t, std::unique_ptr<Region>> fRegions;
+
+    std::atomic<bool> fInterrupted;
 };
 
 } // namespace shmem
diff --git a/fairmq/shmem/Message.cxx b/fairmq/shmem/Message.cxx
index 73f1403d..3d55d7e3 100644
--- a/fairmq/shmem/Message.cxx
+++ b/fairmq/shmem/Message.cxx
@@ -29,7 +29,6 @@ namespace mq
 namespace shmem
 {
 
-atomic<bool> Message::fInterrupted(false);
 Transport Message::fTransportType = Transport::SHM;
 
 Message::Message(Manager& manager, FairMQTransportFactory* factory)
@@ -113,7 +112,7 @@ bool Message::InitializeChunk(const size_t size)
         } catch (bipc::bad_alloc& ba) {
             // LOG(warn) << "Shared memory full...";
             this_thread::sleep_for(chrono::milliseconds(50));
-            if (fInterrupted) {
+            if (fManager.Interrupted()) {
                 return false;
             } else {
                 continue;
@@ -164,7 +163,7 @@ void* Message::GetData() const
                 fLocalPtr = nullptr;
             }
         } else {
-            fRegionPtr = fManager.GetRemoteRegion(fMeta.fRegionId);
+            fRegionPtr = fManager.GetRegion(fMeta.fRegionId);
             if (fRegionPtr) {
                 fLocalPtr = reinterpret_cast<char*>(fRegionPtr->fRegion.get_address()) + fMeta.fHandle;
             } else {
@@ -221,7 +220,7 @@ void Message::CloseMessage()
             fMeta.fHandle = -1;
         } else {
             if (!fRegionPtr) {
-                fRegionPtr = fManager.GetRemoteRegion(fMeta.fRegionId);
+                fRegionPtr = fManager.GetRegion(fMeta.fRegionId);
             }
 
             if (fRegionPtr) {
diff --git a/fairmq/shmem/Message.h b/fairmq/shmem/Message.h
index 8ebeb9b4..3b0e37bf 100644
--- a/fairmq/shmem/Message.h
+++ b/fairmq/shmem/Message.h
@@ -65,7 +65,6 @@ class Message final : public fair::mq::Message
     mutable Region* fRegionPtr;
     mutable char* fLocalPtr;
 
-    static std::atomic<bool> fInterrupted;
     static Transport fTransportType;
 
     bool InitializeChunk(const size_t size);
diff --git a/fairmq/shmem/Monitor.cxx b/fairmq/shmem/Monitor.cxx
index f62d76a9..4f3b6cc5 100644
--- a/fairmq/shmem/Monitor.cxx
+++ b/fairmq/shmem/Monitor.cxx
@@ -15,6 +15,7 @@
 #include <boost/interprocess/file_mapping.hpp>
 
 #include <boost/interprocess/sync/named_mutex.hpp>
+#include <boost/interprocess/sync/named_condition.hpp>
 #include <boost/interprocess/ipc/message_queue.hpp>
 #include <boost/date_time/posix_time/posix_time.hpp>
 
@@ -427,6 +428,15 @@ void Monitor::RemoveMutex(const string& name)
     }
 }
 
+void Monitor::RemoveCondition(const string& name)
+{
+    if (bipc::named_condition::remove(name.c_str())) {
+        cout << "Successfully removed \"" << name << "\"." << endl;
+    } else {
+        cout << "Did not remove \"" << name << "\". Already removed?" << endl;
+    }
+}
+
 void Monitor::Cleanup(const string& shmId)
 {
     string managementSegmentName("fmq_" + shmId + "_mng");
@@ -469,6 +479,7 @@ void Monitor::Cleanup(const string& shmId)
 
     RemoveObject("fmq_" + shmId + "_main");
     RemoveMutex("fmq_" + shmId + "_mtx");
+    RemoveCondition("fmq_" + shmId + "_cv");
 
     cout << endl;
 }
diff --git a/fairmq/shmem/Monitor.h b/fairmq/shmem/Monitor.h
index cbcedb0f..4492668d 100644
--- a/fairmq/shmem/Monitor.h
+++ b/fairmq/shmem/Monitor.h
@@ -42,6 +42,7 @@ class Monitor
     static void RemoveFileMapping(const std::string&);
     static void RemoveQueue(const std::string&);
     static void RemoveMutex(const std::string&);
+    static void RemoveCondition(const std::string&);
 
     struct DaemonPresent : std::runtime_error { using std::runtime_error::runtime_error; };
 
diff --git a/fairmq/shmem/Region.cxx b/fairmq/shmem/Region.cxx
index cd046dc1..4259fee4 100644
--- a/fairmq/shmem/Region.cxx
+++ b/fairmq/shmem/Region.cxx
@@ -71,7 +71,6 @@ Region::Region(Manager& manager, uint64_t id, uint64_t size, bool remote, Region
 
     InitializeQueues();
     LOG(debug) << "shmem: initialized region: " << fName;
-    fSendAcksWorker = thread(&Region::SendAcks, this);
 }
 
 void Region::InitializeQueues()
@@ -84,6 +83,11 @@ void Region::InitializeQueues()
     LOG(debug) << "shmem: initialized region queue: " << fQueueName;
 }
 
+void Region::StartSendingAcks()
+{
+    fSendAcksWorker = thread(&Region::SendAcks, this);
+}
+
 void Region::StartReceivingAcks()
 {
     fReceiveAcksWorker = thread(&Region::ReceiveAcks, this);
@@ -114,12 +118,12 @@ void Region::ReceiveAcks()
 
 void Region::ReleaseBlock(const RegionBlock &block)
 {
-    unique_lock<mutex> lock(fBlockLock);
+    unique_lock<mutex> lock(fBlockMtx);
 
     fBlocksToFree.emplace_back(block);
 
     if (fBlocksToFree.size() >= fAckBunchSize) {
-        lock.unlock(); // reduces contention on fBlockLock
+        lock.unlock(); // reduces contention on fBlockMtx
         fBlockSendCV.notify_one();
     }
 }
@@ -132,7 +136,7 @@ void Region::SendAcks()
         size_t blocksToSend = 0;
 
         {   // mutex locking block
-            unique_lock<mutex> lock(fBlockLock);
+            unique_lock<mutex> lock(fBlockMtx);
 
             // try to get more blocks without waiting (we can miss a notify from CloseMessage())
             if (!fStop && (fBlocksToFree.size() < fAckBunchSize)) {
@@ -166,6 +170,7 @@ Region::~Region()
     fStop = true;
 
     if (fSendAcksWorker.joinable()) {
+        fBlockSendCV.notify_one();
         fSendAcksWorker.join();
     }
 
diff --git a/fairmq/shmem/Region.h b/fairmq/shmem/Region.h
index ea2f83dd..99d047b4 100644
--- a/fairmq/shmem/Region.h
+++ b/fairmq/shmem/Region.h
@@ -49,11 +49,11 @@ struct Region
 
     void InitializeQueues();
 
+    void StartSendingAcks();
+    void SendAcks();
     void StartReceivingAcks();
     void ReceiveAcks();
-
     void ReleaseBlock(const RegionBlock &);
-    void SendAcks();
 
     ~Region();
 
@@ -67,7 +67,7 @@ struct Region
     boost::interprocess::file_mapping fFileMapping;
     boost::interprocess::mapped_region fRegion;
 
-    std::mutex fBlockLock;
+    std::mutex fBlockMtx;
     std::condition_variable fBlockSendCV;
     std::vector<RegionBlock> fBlocksToFree;
     const std::size_t fAckBunchSize = 256;
diff --git a/fairmq/shmem/Socket.cxx b/fairmq/shmem/Socket.cxx
index b58df26c..42e183a4 100644
--- a/fairmq/shmem/Socket.cxx
+++ b/fairmq/shmem/Socket.cxx
@@ -28,8 +28,6 @@ namespace mq
 namespace shmem
 {
 
-atomic<bool> Socket::fInterrupted(false);
-
 struct ZMsg
 {
     ZMsg()            { int rc __attribute__((unused)) = zmq_msg_init(&fMsg);            assert(rc == 0); }
@@ -133,7 +131,7 @@ int Socket::Send(MessagePtr& msg, const int timeout)
     ZMsg zmqMsg(sizeof(MetaHeader));
     std::memcpy(zmqMsg.Data(), &(shmMsg->fMeta), sizeof(MetaHeader));
 
-    while (true && !fInterrupted) {
+    while (true && !fManager.Interrupted()) {
         int nbytes = zmq_msg_send(zmqMsg.Msg(), fSocket, flags);
         if (nbytes > 0) {
             shmMsg->fQueued = true;
@@ -142,7 +140,7 @@ int Socket::Send(MessagePtr& msg, const int timeout)
             fBytesTx += size;
             return size;
         } else if (zmq_errno() == EAGAIN) {
-            if (!fInterrupted && ((flags & ZMQ_DONTWAIT) == 0)) {
+            if (!fManager.Interrupted() && ((flags & ZMQ_DONTWAIT) == 0)) {
                 if (timeout > 0) {
                     elapsed += fSndTimeout;
                     if (elapsed >= timeout) {
@@ -198,7 +196,7 @@ int Socket::Receive(MessagePtr& msg, const int timeout)
             ++fMessagesRx;
             return size;
         } else if (zmq_errno() == EAGAIN) {
-            if (!fInterrupted && ((flags & ZMQ_DONTWAIT) == 0)) {
+            if (!fManager.Interrupted() && ((flags & ZMQ_DONTWAIT) == 0)) {
                 if (timeout > 0) {
                     elapsed += fRcvTimeout;
                     if (elapsed >= timeout) {
@@ -242,7 +240,7 @@ int64_t Socket::Send(vector<MessagePtr>& msgVec, const int timeout)
         std::memcpy(metas++, &(shmMsg->fMeta), sizeof(MetaHeader));
     }
 
-    while (!fInterrupted) {
+    while (!fManager.Interrupted()) {
         int64_t totalSize = 0;
         int nbytes = zmq_msg_send(zmqMsg.Msg(), fSocket, flags);
         if (nbytes > 0) {
@@ -260,7 +258,7 @@ int64_t Socket::Send(vector<MessagePtr>& msgVec, const int timeout)
 
             return totalSize;
         } else if (zmq_errno() == EAGAIN) {
-            if (!fInterrupted && ((flags & ZMQ_DONTWAIT) == 0)) {
+            if (!fManager.Interrupted() && ((flags & ZMQ_DONTWAIT) == 0)) {
                 if (timeout > 0) {
                     elapsed += fSndTimeout;
                     if (elapsed >= timeout) {
@@ -296,7 +294,7 @@ int64_t Socket::Receive(vector<MessagePtr>& msgVec, const int timeout)
 
     ZMsg zmqMsg;
 
-    while (!fInterrupted) {
+    while (!fManager.Interrupted()) {
         int64_t totalSize = 0;
         int nbytes = zmq_msg_recv(zmqMsg.Msg(), fSocket, flags);
         if (nbytes > 0) {
@@ -327,7 +325,7 @@ int64_t Socket::Receive(vector<MessagePtr>& msgVec, const int timeout)
 
             return totalSize;
         } else if (zmq_errno() == EAGAIN) {
-            if (!fInterrupted && ((flags & ZMQ_DONTWAIT) == 0)) {
+            if (!fManager.Interrupted() && ((flags & ZMQ_DONTWAIT) == 0)) {
                 if (timeout > 0) {
                     elapsed += fRcvTimeout;
                     if (elapsed >= timeout) {
@@ -365,20 +363,6 @@ void Socket::Close()
     fSocket = nullptr;
 }
 
-void Socket::Interrupt()
-{
-    Manager::Interrupt();
-    Message::fInterrupted = true;
-    fInterrupted = true;
-}
-
-void Socket::Resume()
-{
-    Manager::Resume();
-    Message::fInterrupted = false;
-    fInterrupted = false;
-}
-
 void Socket::SetOption(const string& option, const void* value, size_t valueSize)
 {
     if (zmq_setsockopt(fSocket, GetConstant(option), value, valueSize) < 0) {
diff --git a/fairmq/shmem/Socket.h b/fairmq/shmem/Socket.h
index 76940f6d..143ffdb4 100644
--- a/fairmq/shmem/Socket.h
+++ b/fairmq/shmem/Socket.h
@@ -46,9 +46,6 @@ class Socket final : public fair::mq::Socket
 
     void Close() override;
 
-    static void Interrupt();
-    static void Resume();
-
     void SetOption(const std::string& option, const void* value, size_t valueSize) override;
     void GetOption(const std::string& option, void* value, size_t* valueSize) override;
 
@@ -81,8 +78,6 @@ class Socket final : public fair::mq::Socket
     std::atomic<unsigned long> fMessagesTx;
     std::atomic<unsigned long> fMessagesRx;
 
-    static std::atomic<bool> fInterrupted;
-
     int fSndTimeout;
     int fRcvTimeout;
 };
diff --git a/fairmq/shmem/TransportFactory.cxx b/fairmq/shmem/TransportFactory.cxx
index 8502dcb7..ed6bca02 100644
--- a/fairmq/shmem/TransportFactory.cxx
+++ b/fairmq/shmem/TransportFactory.cxx
@@ -164,6 +164,26 @@ UnmanagedRegionPtr TransportFactory::CreateUnmanagedRegion(const size_t size, Re
     return tools::make_unique<UnmanagedRegion>(*fManager, size, callback, path, flags);
 }
 
+UnmanagedRegionPtr TransportFactory::CreateUnmanagedRegion(const size_t size, const int64_t userFlags, RegionCallback callback, const std::string& path /* = "" */, int flags /* = 0 */) const
+{
+    return tools::make_unique<UnmanagedRegion>(*fManager, size, userFlags, callback, path, flags);
+}
+
+void TransportFactory::SubscribeToRegionEvents(RegionEventCallback callback)
+{
+    fManager->SubscribeToRegionEvents(callback);
+}
+
+void TransportFactory::UnsubscribeFromRegionEvents()
+{
+    fManager->UnsubscribeFromRegionEvents();
+}
+
+vector<fair::mq::RegionInfo> TransportFactory::GetRegionInfo()
+{
+    return fManager->GetRegionInfo();
+}
+
 Transport TransportFactory::GetType() const
 {
     return fTransportType;
diff --git a/fairmq/shmem/TransportFactory.h b/fairmq/shmem/TransportFactory.h
index 2864004e..97136e66 100644
--- a/fairmq/shmem/TransportFactory.h
+++ b/fairmq/shmem/TransportFactory.h
@@ -50,11 +50,16 @@ class TransportFactory final : public fair::mq::TransportFactory
     PollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const override;
 
     UnmanagedRegionPtr CreateUnmanagedRegion(const size_t size, RegionCallback callback = nullptr, const std::string& path = "", int flags = 0) const override;
+    UnmanagedRegionPtr CreateUnmanagedRegion(const size_t size, int64_t userFlags, RegionCallback callback = nullptr, const std::string& path = "", int flags = 0) const override;
+
+    void SubscribeToRegionEvents(RegionEventCallback callback) override;
+    void UnsubscribeFromRegionEvents() override;
+    std::vector<fair::mq::RegionInfo> GetRegionInfo() override;
 
     Transport GetType() const override;
 
-    void Interrupt() override { Socket::Interrupt(); }
-    void Resume() override { Socket::Resume(); }
+    void Interrupt() override { fManager->Interrupt(); }
+    void Resume() override { fManager->Resume(); }
     void Reset() override;
 
     void IncrementMsgCounter() { ++fMsgCounter; }
diff --git a/fairmq/shmem/UnmanagedRegion.cxx b/fairmq/shmem/UnmanagedRegion.cxx
deleted file mode 100644
index 88a7df8d..00000000
--- a/fairmq/shmem/UnmanagedRegion.cxx
+++ /dev/null
@@ -1,52 +0,0 @@
-/********************************************************************************
- *    Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH    *
- *                                                                              *
- *              This software is distributed under the terms of the             *
- *              GNU Lesser General Public Licence (LGPL) version 3,             *
- *                  copied verbatim in the file "LICENSE"                       *
- ********************************************************************************/
-
-#include "Common.h"
-#include "UnmanagedRegion.h"
-
-using namespace std;
-
-namespace bipc = ::boost::interprocess;
-
-namespace fair
-{
-namespace mq
-{
-namespace shmem
-{
-
-UnmanagedRegion::UnmanagedRegion(Manager& manager, const size_t size, RegionCallback callback, const std::string& path /* = "" */, int flags /* = 0 */)
-    : fManager(manager)
-    , fRegion(nullptr)
-    , fRegionId(0)
-{
-    try {
-        RegionCounter* rc = fManager.ManagementSegment().find<RegionCounter>(bipc::unique_instance).first;
-        if (rc) {
-            LOG(debug) << "region counter found, with value of " << rc->fCount << ". incrementing.";
-            (rc->fCount)++;
-            LOG(debug) << "incremented region counter, now: " << rc->fCount;
-        } else {
-            LOG(debug) << "no region counter found, creating one and initializing with 1";
-            rc = fManager.ManagementSegment().construct<RegionCounter>(bipc::unique_instance)(1);
-            LOG(debug) << "initialized region counter with: " << rc->fCount;
-        }
-
-        fRegionId = rc->fCount;
-
-        fRegion = fManager.CreateRegion(size, fRegionId, callback, path, flags);
-    } catch (bipc::interprocess_exception& e) {
-        LOG(error) << "cannot create region. Already created/not cleaned up?";
-        LOG(error) << e.what();
-        throw;
-    }
-}
-
-}
-}
-}
diff --git a/fairmq/shmem/UnmanagedRegion.h b/fairmq/shmem/UnmanagedRegion.h
index cb583373..8d7a47a6 100644
--- a/fairmq/shmem/UnmanagedRegion.h
+++ b/fairmq/shmem/UnmanagedRegion.h
@@ -36,7 +36,19 @@ class UnmanagedRegion final : public fair::mq::UnmanagedRegion
     friend class Socket;
 
   public:
-    UnmanagedRegion(Manager& manager, const size_t size, RegionCallback callback = nullptr, const std::string& path = "", int flags = 0);
+    UnmanagedRegion(Manager& manager, const size_t size, RegionCallback callback, const std::string& path = "", int flags = 0)
+        : UnmanagedRegion(manager, size, 0, callback, path, flags)
+    {}
+
+    UnmanagedRegion(Manager& manager, const size_t size, const int64_t userFlags, RegionCallback callback, const std::string& path = "", int flags = 0)
+        : fManager(manager)
+        , fRegion(nullptr)
+        , fRegionId(0)
+    {
+        auto result = fManager.CreateRegion(size, userFlags, callback, path, flags);
+        fRegion = result.first;
+        fRegionId = result.second;
+    }
 
     void* GetData() const override { return fRegion->get_address(); }
     size_t GetSize() const override { return fRegion->get_size(); }
@@ -53,4 +65,4 @@ class UnmanagedRegion final : public fair::mq::UnmanagedRegion
 }
 }
 
-#endif /* FAIR_MQ_SHMEM_UNMANAGEDREGION_H_ */
\ No newline at end of file
+#endif /* FAIR_MQ_SHMEM_UNMANAGEDREGION_H_ */
diff --git a/fairmq/zeromq/FairMQTransportFactoryZMQ.cxx b/fairmq/zeromq/FairMQTransportFactoryZMQ.cxx
index 458c6353..73ebc90f 100644
--- a/fairmq/zeromq/FairMQTransportFactoryZMQ.cxx
+++ b/fairmq/zeromq/FairMQTransportFactoryZMQ.cxx
@@ -95,6 +95,11 @@ FairMQUnmanagedRegionPtr FairMQTransportFactoryZMQ::CreateUnmanagedRegion(const
     return unique_ptr<FairMQUnmanagedRegion>(new FairMQUnmanagedRegionZMQ(size, callback, path, flags));
 }
 
+FairMQUnmanagedRegionPtr FairMQTransportFactoryZMQ::CreateUnmanagedRegion(const size_t size, const int64_t userFlags, FairMQRegionCallback callback, const std::string& path /* = "" */, int flags /* = 0 */) const
+{
+    return unique_ptr<FairMQUnmanagedRegion>(new FairMQUnmanagedRegionZMQ(size, userFlags, callback, path, flags));
+}
+
 fair::mq::Transport FairMQTransportFactoryZMQ::GetType() const
 {
     return fTransportType;
diff --git a/fairmq/zeromq/FairMQTransportFactoryZMQ.h b/fairmq/zeromq/FairMQTransportFactoryZMQ.h
index 139f9697..6a05163d 100644
--- a/fairmq/zeromq/FairMQTransportFactoryZMQ.h
+++ b/fairmq/zeromq/FairMQTransportFactoryZMQ.h
@@ -46,6 +46,11 @@ class FairMQTransportFactoryZMQ final : public FairMQTransportFactory
     FairMQPollerPtr CreatePoller(const std::unordered_map<std::string, std::vector<FairMQChannel>>& channelsMap, const std::vector<std::string>& channelList) const override;
 
     FairMQUnmanagedRegionPtr CreateUnmanagedRegion(const size_t size, FairMQRegionCallback callback, const std::string& path = "", int flags = 0) const override;
+    FairMQUnmanagedRegionPtr CreateUnmanagedRegion(const size_t size, int64_t userFlags, FairMQRegionCallback callback = nullptr, const std::string& path = "", int flags = 0) const override;
+
+    void SubscribeToRegionEvents(FairMQRegionEventCallback /* callback */) override { LOG(error) << "SubscribeToRegionEvents not yet implemented for ZeroMQ"; }
+    void UnsubscribeFromRegionEvents() override { LOG(error) << "UnsubscribeFromRegionEvents not yet implemented for ZeroMQ"; }
+    std::vector<FairMQRegionInfo> GetRegionInfo() override { LOG(error) << "GetRegionInfo not yet implemented for ZeroMQ, returning empty vector"; return std::vector<FairMQRegionInfo>(); }
 
     fair::mq::Transport GetType() const override;
 
diff --git a/fairmq/zeromq/FairMQUnmanagedRegionZMQ.cxx b/fairmq/zeromq/FairMQUnmanagedRegionZMQ.cxx
index ed9ce453..66184e51 100644
--- a/fairmq/zeromq/FairMQUnmanagedRegionZMQ.cxx
+++ b/fairmq/zeromq/FairMQUnmanagedRegionZMQ.cxx
@@ -18,6 +18,13 @@ FairMQUnmanagedRegionZMQ::FairMQUnmanagedRegionZMQ(const size_t size, FairMQRegi
 {
 }
 
+FairMQUnmanagedRegionZMQ::FairMQUnmanagedRegionZMQ(const size_t size, int64_t /* userFlags */, FairMQRegionCallback callback, const std::string& /* path = "" */, int /* flags = 0 */)
+    : fBuffer(malloc(size))
+    , fSize(size)
+    , fCallback(callback)
+{
+}
+
 void* FairMQUnmanagedRegionZMQ::GetData() const
 {
     return fBuffer;
diff --git a/fairmq/zeromq/FairMQUnmanagedRegionZMQ.h b/fairmq/zeromq/FairMQUnmanagedRegionZMQ.h
index bf7c4a1d..025690ed 100644
--- a/fairmq/zeromq/FairMQUnmanagedRegionZMQ.h
+++ b/fairmq/zeromq/FairMQUnmanagedRegionZMQ.h
@@ -21,6 +21,7 @@ class FairMQUnmanagedRegionZMQ final : public FairMQUnmanagedRegion
 
   public:
     FairMQUnmanagedRegionZMQ(const size_t size, FairMQRegionCallback callback, const std::string& path = "", int flags = 0);
+    FairMQUnmanagedRegionZMQ(const size_t size, const int64_t userFlags, FairMQRegionCallback callback, const std::string& path = "", int flags = 0);
     FairMQUnmanagedRegionZMQ(const FairMQUnmanagedRegionZMQ&) = delete;
     FairMQUnmanagedRegionZMQ operator=(const FairMQUnmanagedRegionZMQ&) = delete;
 
@@ -35,4 +36,4 @@ class FairMQUnmanagedRegionZMQ final : public FairMQUnmanagedRegion
     FairMQRegionCallback fCallback;
 };
 
-#endif /* FAIRMQUNMANAGEDREGIONZMQ_H_ */
\ No newline at end of file
+#endif /* FAIRMQUNMANAGEDREGIONZMQ_H_ */