shm: add APIs for implementing keep-alive process

fairmq/shmem/UnmanagedRegionImpl.h

@@ -0,0 +1,71 @@
+/********************************************************************************
+ *    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"                       *
+ ********************************************************************************/
+
+#ifndef FAIR_MQ_SHMEM_UNMANAGEDREGIONIMPL_H_
+#define FAIR_MQ_SHMEM_UNMANAGEDREGIONIMPL_H_
+
+#include "Manager.h"
+#include "UnmanagedRegion.h"
+#include <fairmq/UnmanagedRegion.h>
+
+#include <fairlogger/Logger.h>
+
+#include <cstddef> // size_t
+
+namespace fair::mq::shmem
+{
+
+class Message;
+class Socket;
+
+class UnmanagedRegionImpl final : public fair::mq::UnmanagedRegion
+{
+    friend class Message;
+    friend class Socket;
+
+  public:
+    UnmanagedRegionImpl(Manager& manager,
+                    const size_t size,
+                    RegionCallback callback,
+                    RegionBulkCallback bulkCallback,
+                    fair::mq::RegionConfig cfg,
+                    FairMQTransportFactory* factory)
+        : fair::mq::UnmanagedRegion(factory)
+        , fManager(manager)
+        , fRegion(nullptr)
+        , fRegionId(0)
+    {
+        auto result = fManager.CreateRegion(size, callback, bulkCallback, std::move(cfg));
+        fRegion = result.first;
+        fRegionId = result.second;
+    }
+
+    UnmanagedRegionImpl(const UnmanagedRegionImpl&) = delete;
+    UnmanagedRegionImpl(UnmanagedRegionImpl&&) = delete;
+    UnmanagedRegionImpl& operator=(const UnmanagedRegionImpl&) = delete;
+    UnmanagedRegionImpl& operator=(UnmanagedRegionImpl&&) = delete;
+
+    void* GetData() const override { return fRegion->GetData(); }
+    size_t GetSize() const override { return fRegion->GetSize(); }
+    uint16_t GetId() const override { return fRegionId; }
+    void SetLinger(uint32_t linger) override { fRegion->SetLinger(linger); }
+    uint32_t GetLinger() const override { return fRegion->GetLinger(); }
+
+    Transport GetType() const override { return fair::mq::Transport::SHM; }
+
+    ~UnmanagedRegionImpl() override { fManager.RemoveRegion(fRegionId); }
+
+  private:
+    Manager& fManager;
+    shmem::UnmanagedRegion* fRegion;
+    uint16_t fRegionId;
+};
+
+} // namespace fair::mq::shmem
+
+#endif /* FAIR_MQ_SHMEM_UNMANAGEDREGIONIMPL_H_ */