[21293] Fix destruction data-race on participant removal in intra-process (backport #5034)

src/cpp/rtps/RTPSDomain.cpp

@@ -41,6 +41,7 @@
 #include <rtps/network/utils/external_locators.hpp>
 #include <rtps/participant/RTPSParticipantImpl.hpp>
 #include <rtps/reader/BaseReader.hpp>
+#include <rtps/reader/LocalReaderPointer.hpp>
 #include <rtps/RTPSDomainImpl.hpp>
 #include <rtps/transport/TCPv4Transport.h>
 #include <rtps/transport/TCPv6Transport.h>
@@ -690,7 +691,7 @@ RTPSParticipantImpl* RTPSDomainImpl::find_local_participant(
     return nullptr;
 }
 
-BaseReader* RTPSDomainImpl::find_local_reader(
+std::shared_ptr<LocalReaderPointer> RTPSDomainImpl::find_local_reader(
         const GUID_t& reader_guid)
 {
     auto instance = get_instance();
@@ -704,7 +705,7 @@ BaseReader* RTPSDomainImpl::find_local_reader(
         }
     }
 
-    return nullptr;
+    return std::shared_ptr<LocalReaderPointer>(nullptr);
 }
 
 BaseWriter* RTPSDomainImpl::find_local_writer(

src/cpp/rtps/RTPSDomainImpl.hpp

@@ -30,6 +30,7 @@
 #include <fastdds/rtps/writer/RTPSWriter.hpp>
 
 #include <rtps/reader/BaseReader.hpp>
+#include <rtps/reader/LocalReaderPointer.hpp>
 #include <rtps/writer/BaseWriter.hpp>
 #include <utils/shared_memory/BoostAtExitRegistry.hpp>
 #include <utils/SystemInfo.hpp>
@@ -175,7 +176,7 @@ class RTPSDomainImpl
      *
      * @returns A pointer to a local reader given its endpoint guid, or nullptr if not found.
      */
-    static BaseReader* find_local_reader(
+    static std::shared_ptr<LocalReaderPointer> find_local_reader(
             const GUID_t& reader_guid);
 
     /**

src/cpp/rtps/participant/RTPSParticipantImpl.cpp

@@ -1350,7 +1350,7 @@ bool RTPSParticipantImpl::createReader(
     return create_reader(ReaderOut, param, entityId, isBuiltin, enable, callback);
 }
 
-BaseReader* RTPSParticipantImpl::find_local_reader(
+std::shared_ptr<LocalReaderPointer> RTPSParticipantImpl::find_local_reader(
         const GUID_t& reader_guid)
 {
     shared_lock<shared_mutex> _(endpoints_list_mutex);
@@ -1359,11 +1359,11 @@ BaseReader* RTPSParticipantImpl::find_local_reader(
     {
         if (reader->getGuid() == reader_guid)
         {
-            return reader;
+            return reader->get_local_pointer();
         }
     }
 
-    return nullptr;
+    return std::shared_ptr<LocalReaderPointer>();
 }
 
 BaseWriter* RTPSParticipantImpl::find_local_writer(
@@ -1960,6 +1960,7 @@ bool RTPSParticipantImpl::deleteUserEndpoint(
 
     bool found = false, found_in_users = false;
     Endpoint* p_endpoint = nullptr;
+    BaseReader* reader = nullptr;
 
     if (endpoint.entityId.is_writer())
     {
@@ -1994,6 +1995,7 @@ bool RTPSParticipantImpl::deleteUserEndpoint(
         {
             if ((*rit)->getGuid().entityId == endpoint.entityId) //Found it
             {
+                reader = *rit;
                 m_userReaderList.erase(rit);
                 found_in_users = true;
                 break;
@@ -2004,6 +2006,7 @@ bool RTPSParticipantImpl::deleteUserEndpoint(
         {
             if ((*rit)->getGuid().entityId == endpoint.entityId) //Found it
             {
+                reader = *rit;
                 p_endpoint = *rit;
                 m_allReaderList.erase(rit);
                 found = true;
@@ -2062,6 +2065,10 @@ bool RTPSParticipantImpl::deleteUserEndpoint(
 #endif // if HAVE_SECURITY
     }
 
+    if (reader)
+    {
+        reader->local_actions_on_reader_removed();
+    }
     delete(p_endpoint);
     return true;
 }
@@ -2149,6 +2156,11 @@ void RTPSParticipantImpl::deleteAllUserEndpoints()
         }
 #endif // if HAVE_SECURITY
 
+        if (kind == READER)
+        {
+            static_cast<BaseReader*>(endpoint)->local_actions_on_reader_removed();
+        }
+
         // remove the endpoints
         delete(endpoint);
     }
@@ -2837,8 +2849,11 @@ bool RTPSParticipantImpl::register_in_reader(
     }
     else if (!fastdds::statistics::is_statistics_builtin(reader_guid.entityId))
     {
-        BaseReader* reader = find_local_reader(reader_guid);
-        res = reader->add_statistics_listener(listener);
+        LocalReaderPointer::Instance local_reader(find_local_reader(reader_guid));
+        if (local_reader)
+        {
+            res = local_reader->add_statistics_listener(listener);
+        }
     }
 
     return res;

src/cpp/rtps/participant/RTPSParticipantImpl.hpp

@@ -56,6 +56,7 @@
 #include <rtps/messages/SendBuffersManager.hpp>
 #include <rtps/network/NetworkFactory.hpp>
 #include <rtps/network/ReceiverResource.h>
+#include <rtps/reader/LocalReaderPointer.hpp>
 #include <rtps/resources/ResourceEvent.h>
 #include <statistics/rtps/monitor-service/interfaces/IConnectionsObserver.hpp>
 #include <statistics/rtps/monitor-service/interfaces/IConnectionsQueryable.hpp>
@@ -477,7 +478,7 @@ class RTPSParticipantImpl
     /***
      * @returns A pointer to a local reader given its endpoint guid, or nullptr if not found.
      */
-    BaseReader* find_local_reader(
+    std::shared_ptr<LocalReaderPointer> find_local_reader(
             const GUID_t& reader_guid);
 
     /***

src/cpp/rtps/reader/BaseReader.cpp

@@ -107,6 +107,11 @@ BaseReader::BaseReader(
     setup_datasharing(att);
 }
 
+void BaseReader::local_actions_on_reader_removed()
+{
+    local_ptr_->deactivate();
+}
+
 BaseReader::~BaseReader()
 {
     EPROSIMA_LOG_INFO(RTPS_READER, "Removing reader " << this->getGuid().entityId);
@@ -272,6 +277,11 @@ void BaseReader::allow_unknown_writers()
     accept_messages_from_unkown_writers_ = true;
 }
 
+std::shared_ptr<LocalReaderPointer> BaseReader::get_local_pointer()
+{
+    return local_ptr_;
+}
+
 bool BaseReader::reserve_cache(
         uint32_t cdr_payload_size,
         fastdds::rtps::CacheChange_t*& change)
@@ -501,6 +511,8 @@ void BaseReader::init(
         fixed_payload_size_ = history_->m_att.payloadMaxSize;
     }
 
+    local_ptr_ = std::make_shared<LocalReaderPointer>(this);
+
     EPROSIMA_LOG_INFO(RTPS_READER, "RTPSReader created correctly");
 }
 

src/cpp/rtps/reader/BaseReader.hpp

@@ -42,6 +42,8 @@
 #include <fastdds/statistics/rtps/StatisticsCommon.hpp>
 #include <fastdds/utils/TimedConditionVariable.hpp>
 
+#include <rtps/reader/LocalReaderPointer.hpp>
+
 namespace eprosima {
 
 namespace fastdds {
@@ -163,6 +165,14 @@ class BaseReader
         return datasharing_listener_;
     }
 
+    /**
+     * @brief Retrieves the local pointer to this reader
+     * to be used by other local entities.
+     *
+     * @return Local pointer to this reader.
+     */
+    std::shared_ptr<LocalReaderPointer> get_local_pointer();
+
     /**
      * @brief Reserve a CacheChange_t.
      *
@@ -296,6 +306,11 @@ class BaseReader
             const fastdds::rtps::SequenceNumberSet_t& gapList,
             VendorId_t origin_vendor_id = c_VendorId_Unknown) = 0;
 
+    /**
+     * @brief Waits for not being referenced/used by any other entity.
+     */
+    virtual void local_actions_on_reader_removed();
+
 #ifdef FASTDDS_STATISTICS
 
     bool add_statistics_listener(
@@ -455,6 +470,9 @@ class BaseReader
     /// Trusted writer (for Builtin)
     fastdds::rtps::EntityId_t trusted_writer_entity_id_;
 
+    /// RefCountedPointer of this instance.
+    std::shared_ptr<LocalReaderPointer> local_ptr_;
+
 private:
 
     /**

src/cpp/rtps/reader/LocalReaderPointer.hpp

@@ -0,0 +1,36 @@
+// Copyright 2024 Proyectos y Sistemas de Mantenimiento SL (eProsima).
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @file LocalReaderPointer.hpp
+ */
+
+#ifndef FASTDDS_RTPS_READER__LOCALREADERPOINTER_HPP
+#define FASTDDS_RTPS_READER__LOCALREADERPOINTER_HPP
+
+#include <utils/RefCountedPointer.hpp>
+
+namespace eprosima {
+namespace fastdds {
+namespace rtps {
+
+class BaseReader;
+
+using LocalReaderPointer = RefCountedPointer<BaseReader>;
+
+}  // namespace rtps
+}  // namespace fastdds
+}  // namespace eprosima
+
+#endif // FASTDDS_RTPS_READER__LOCALREADERPOINTER_HPP

src/cpp/rtps/writer/ReaderLocator.cpp

@@ -45,7 +45,7 @@ ReaderLocator::ReaderLocator(
     , async_locator_info_(max_unicast_locators, max_multicast_locators)
     , expects_inline_qos_(false)
     , is_local_reader_(false)
-    , local_reader_(nullptr)
+    , local_reader_()
     , guid_prefix_as_vector_(1u)
     , guid_as_vector_(1u)
     , datasharing_notifier_(nullptr)
@@ -84,7 +84,7 @@ bool ReaderLocator::start(
 
         is_local_reader_ = RTPSDomainImpl::should_intraprocess_between(owner_->getGuid(), remote_guid);
         is_datasharing &= !is_local_reader_;
-        local_reader_ = nullptr;
+        local_reader_.reset();
 
         if (!is_local_reader_ && !is_datasharing)
         {
@@ -177,7 +177,7 @@ void ReaderLocator::stop()
     guid_prefix_as_vector_.at(0) = c_GuidPrefix_Unknown;
     expects_inline_qos_ = false;
     is_local_reader_ = false;
-    local_reader_ = nullptr;
+    local_reader_.reset();
 }
 
 bool ReaderLocator::send(
@@ -206,13 +206,13 @@ bool ReaderLocator::send(
     return true;
 }
 
-BaseReader* ReaderLocator::local_reader()
+LocalReaderPointer::Instance ReaderLocator::local_reader()
 {
     if (!local_reader_)
     {
         local_reader_ = RTPSDomainImpl::find_local_reader(general_locator_info_.remote_guid);
     }
-    return local_reader_;
+    return LocalReaderPointer::Instance(local_reader_);
 }
 
 bool ReaderLocator::is_datasharing_reader() const
@@ -222,15 +222,13 @@ bool ReaderLocator::is_datasharing_reader() const
 
 void ReaderLocator::datasharing_notify()
 {
-    RTPSReader* reader = nullptr;
     if (is_local_reader())
     {
-        reader = local_reader();
-    }
-
-    if (reader)
-    {
-        BaseReader::downcast(reader)->datasharing_listener()->notify(true);
+        LocalReaderPointer::Instance reader = local_reader();
+        if (reader)
+        {
+            reader->datasharing_listener()->notify(true);
+        }
     }
     else
     {

src/cpp/rtps/writer/ReaderLocator.hpp

@@ -25,6 +25,8 @@
 #include <fastdds/rtps/messages/RTPSMessageSenderInterface.hpp>
 #include <fastdds/rtps/common/LocatorSelectorEntry.hpp>
 
+#include <rtps/reader/LocalReaderPointer.hpp>
+
 namespace eprosima {
 namespace fastdds {
 namespace rtps {
@@ -67,10 +69,10 @@ class ReaderLocator : public RTPSMessageSenderInterface
         return is_local_reader_;
     }
 
-    BaseReader* local_reader();
+    LocalReaderPointer::Instance local_reader();
 
     void local_reader(
-            BaseReader* local_reader)
+            std::shared_ptr<LocalReaderPointer> local_reader)
     {
         local_reader_ = local_reader;
     }
@@ -260,7 +262,7 @@ class ReaderLocator : public RTPSMessageSenderInterface
     LocatorSelectorEntry async_locator_info_;
     bool expects_inline_qos_;
     bool is_local_reader_;
-    BaseReader* local_reader_;
+    std::shared_ptr<LocalReaderPointer> local_reader_;
     std::vector<GuidPrefix_t> guid_prefix_as_vector_;
     std::vector<GUID_t> guid_as_vector_;
     IDataSharingNotifier* datasharing_notifier_;

src/cpp/rtps/writer/ReaderProxy.hpp

@@ -290,7 +290,7 @@ class ReaderProxy
      * Get the local reader on the same process (if any).
      * @return The local reader on the same process.
      */
-    inline BaseReader* local_reader()
+    inline LocalReaderPointer::Instance local_reader()
     {
         return locator_info_.local_reader();
     }