iox-eclipse-iceoryx#2128 Add a name to the MePooSegment data struct…

…ure and allow multiple write-access segments to be mapped

iceoryx_posh/include/iceoryx_posh/error_handling/error_handling.hpp

@@ -111,9 +111,9 @@ namespace iox
     error(MEPOO__MEMPOOL_GETCHUNK_POOL_IS_RUNNING_OUT_OF_CHUNKS) \
     error(MEPOO__MEMPOOL_CHUNKSIZE_MUST_BE_MULTIPLE_OF_CHUNK_MEMORY_ALIGNMENT) \
     error(MEPOO__MEMPOOL_ADDMEMPOOL_AFTER_GENERATECHUNKMANAGEMENTPOOL) \
+    error(MEPOO__MULTIPLE_SEGMENT_CONFIG_ENTRIES_WITH_SAME_NAME) \
     error(MEPOO__TYPED_MEMPOOL_HAS_INCONSISTENT_STATE) \
     error(MEPOO__TYPED_MEMPOOL_MANAGEMENT_SEGMENT_IS_BROKEN) \
-    error(MEPOO__USER_WITH_MORE_THAN_ONE_WRITE_SEGMENT) \
     error(MEPOO__SEGMENT_COULD_NOT_APPLY_POSIX_RIGHTS_TO_SHARED_MEMORY) \
     error(MEPOO__SEGMENT_UNABLE_TO_CREATE_SHARED_MEMORY_OBJECT) \
     error(MEPOO__SEGMENT_INSUFFICIENT_SEGMENT_IDS) \

iceoryx_posh/include/iceoryx_posh/internal/mepoo/mepoo_segment.hpp

@@ -1,6 +1,7 @@
 // Copyright (c) 2019 by Robert Bosch GmbH. All rights reserved.
 // Copyright (c) 2021 by Apex.AI Inc. All rights reserved.
 // Copyright (c) 2023 by Mathias Kraus <elboberido@m-hias.de>. All rights reserved.
+// Copyright (c) 2024 by Latitude AI. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -35,7 +36,8 @@ template <typename SharedMemoryObjectType = PosixSharedMemoryObject, typename Me
 class MePooSegment
 {
   public:
-    MePooSegment(const MePooConfig& mempoolConfig,
+    MePooSegment(const ShmName_t& name,
+                 const MePooConfig& mempoolConfig,
                  BumpAllocator& managementAllocator,
                  const PosixGroup& readerGroup,
                  const PosixGroup& writerGroup,
@@ -46,15 +48,18 @@ class MePooSegment
 
     MemoryManagerType& getMemoryManager() noexcept;
 
+    const ShmName_t& getSegmentName() const noexcept;
+
     uint64_t getSegmentId() const noexcept;
 
     uint64_t getSegmentSize() const noexcept;
 
   protected:
     SharedMemoryObjectType createSharedMemoryObject(const MePooConfig& mempoolConfig,
-                                                    const PosixGroup& writerGroup) noexcept;
+                                                    const ShmName_t& name) noexcept;
 
   protected:
+    ShmName_t m_name;
     PosixGroup m_readerGroup;
     PosixGroup m_writerGroup;
     uint64_t m_segmentId{0};

iceoryx_posh/include/iceoryx_posh/internal/mepoo/mepoo_segment.inl

@@ -1,6 +1,7 @@
 // Copyright (c) 2019 by Robert Bosch GmbH. All rights reserved.
 // Copyright (c) 2021 - 2022 by Apex.AI Inc. All rights reserved.
 // Copyright (c) 2023 by Mathias Kraus <elboberido@m-hias.de>. All rights reserved.
+// Copyright (c) 2024 by Latitude AI. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -35,15 +36,17 @@ constexpr access_rights MePooSegment<SharedMemoryObjectType, MemoryManagerType>:
 
 template <typename SharedMemoryObjectType, typename MemoryManagerType>
 inline MePooSegment<SharedMemoryObjectType, MemoryManagerType>::MePooSegment(
+    const ShmName_t& name,
     const MePooConfig& mempoolConfig,
     BumpAllocator& managementAllocator,
     const PosixGroup& readerGroup,
     const PosixGroup& writerGroup,
     const iox::mepoo::MemoryInfo& memoryInfo) noexcept
-    : m_readerGroup(readerGroup)
+    : m_name(name)
+    , m_readerGroup(readerGroup)
     , m_writerGroup(writerGroup)
     , m_memoryInfo(memoryInfo)
-    , m_sharedMemoryObject(createSharedMemoryObject(mempoolConfig, writerGroup))
+    , m_sharedMemoryObject(createSharedMemoryObject(mempoolConfig, name))
 {
     using namespace detail;
     PosixAcl acl;
@@ -68,11 +71,11 @@ inline MePooSegment<SharedMemoryObjectType, MemoryManagerType>::MePooSegment(
 
 template <typename SharedMemoryObjectType, typename MemoryManagerType>
 inline SharedMemoryObjectType MePooSegment<SharedMemoryObjectType, MemoryManagerType>::createSharedMemoryObject(
-    const MePooConfig& mempoolConfig, const PosixGroup& writerGroup) noexcept
+    const MePooConfig& mempoolConfig, const ShmName_t& name) noexcept
 {
     return std::move(
         typename SharedMemoryObjectType::Builder()
-            .name(writerGroup.getName())
+            .name(name)
             .memorySizeInBytes(MemoryManager::requiredChunkMemorySize(mempoolConfig))
             .accessMode(AccessMode::READ_WRITE)
             .openMode(OpenMode::PURGE_AND_CREATE)
@@ -116,6 +119,12 @@ inline MemoryManagerType& MePooSegment<SharedMemoryObjectType, MemoryManagerType
     return m_memoryManager;
 }
 
+template <typename SharedMemoryObjectType, typename MemoryManagerType>
+inline const ShmName_t& MePooSegment<SharedMemoryObjectType, MemoryManagerType>::getSegmentName() const noexcept
+{
+    return m_name;
+}
+
 template <typename SharedMemoryObjectType, typename MemoryManagerType>
 inline uint64_t MePooSegment<SharedMemoryObjectType, MemoryManagerType>::getSegmentId() const noexcept
 {

iceoryx_posh/include/iceoryx_posh/internal/mepoo/segment_manager.hpp

@@ -1,5 +1,6 @@
 // Copyright (c) 2019 by Robert Bosch GmbH. All rights reserved.
 // Copyright (c) 2021 - 2022 by Apex.AI Inc. All rights reserved.
+// Copyright (c) 2024 by Latitude AI. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -54,12 +55,12 @@ class SegmentManager
     struct SegmentMapping
     {
       public:
-        SegmentMapping(const ShmName_t& sharedMemoryName,
+        SegmentMapping(const ShmName_t& name,
                        uint64_t size,
                        bool isWritable,
                        uint64_t segmentId,
                        const iox::mepoo::MemoryInfo& memoryInfo = iox::mepoo::MemoryInfo()) noexcept
-            : m_sharedMemoryName(sharedMemoryName)
+            : m_name(name)
             , m_size(size)
             , m_isWritable(isWritable)
             , m_segmentId(segmentId)
@@ -68,7 +69,7 @@ class SegmentManager
         {
         }
 
-        ShmName_t m_sharedMemoryName{""};
+        ShmName_t m_name{""};
         uint64_t m_size{0};
         bool m_isWritable{false};
         uint64_t m_segmentId{0};

iceoryx_posh/include/iceoryx_posh/internal/mepoo/segment_manager.inl

@@ -1,6 +1,7 @@
 // Copyright (c) 2019 by Robert Bosch GmbH. All rights reserved.
 // Copyright (c) 2021 by Apex.AI Inc. All rights reserved.
 // Copyright (c) 2023 by Mathias Kraus <elboberido@m-hias.de>. All rights reserved.
+// Copyright (c) 2024 by Latitude AI. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -41,10 +42,19 @@ inline SegmentManager<SegmentType>::SegmentManager(const SegmentConfig& segmentC
 template <typename SegmentType>
 inline void SegmentManager<SegmentType>::createSegment(const SegmentConfig::SegmentEntry& segmentEntry) noexcept
 {
+    if (std::find_if(
+            m_segmentContainer.begin(),
+            m_segmentContainer.end(), 
+            [&segmentEntry](const SegmentType& segment){ return segment.getSegmentName() == segmentEntry.m_name;}
+        ) != m_segmentContainer.end())
+    {
+        errorHandler(PoshError::MEPOO__MULTIPLE_SEGMENT_CONFIG_ENTRIES_WITH_SAME_NAME);
+        return;
+    }
     auto readerGroup = PosixGroup(segmentEntry.m_readerGroup);
     auto writerGroup = PosixGroup(segmentEntry.m_writerGroup);
     m_segmentContainer.emplace_back(
-        segmentEntry.m_mempoolConfig, *m_managementAllocator, readerGroup, writerGroup, segmentEntry.m_memoryInfo);
+        segmentEntry.m_name, segmentEntry.m_mempoolConfig, *m_managementAllocator, readerGroup, writerGroup, segmentEntry.m_memoryInfo);
 }
 
 template <typename SegmentType>
@@ -55,44 +65,17 @@ SegmentManager<SegmentType>::getSegmentMappings(const PosixUser& user) noexcept
     auto groupContainer = user.getGroups();
 
     SegmentManager::SegmentMappingContainer mappingContainer;
-    bool foundInWriterGroup = false;
-
-    // with the groups we can get all the segments (read or write) for the user
-    for (const auto& groupID : groupContainer)
-    {
-        for (const auto& segment : m_segmentContainer)
-        {
-            if (segment.getWriterGroup() == groupID)
-            {
-                // a user is allowed to be only in one writer group, as we currently only support one memory manager per
-                // process
-                if (!foundInWriterGroup)
-                {
-                    mappingContainer.emplace_back(
-                        segment.getWriterGroup().getName(), segment.getSegmentSize(), true, segment.getSegmentId());
-                    foundInWriterGroup = true;
-                }
-                else
-                {
-                    errorHandler(PoshError::MEPOO__USER_WITH_MORE_THAN_ONE_WRITE_SEGMENT);
-                    return SegmentManager::SegmentMappingContainer();
-                }
-            }
-        }
-    }
 
-    for (const auto& groupID : groupContainer)
+    for (const auto& segment : m_segmentContainer)
     {
-        for (const auto& segment : m_segmentContainer)
+        for (const auto& groupID : groupContainer)
         {
-            // only add segments which are not yet added as writer
-            if (segment.getReaderGroup() == groupID
-                && std::find_if(mappingContainer.begin(), mappingContainer.end(), [&](const SegmentMapping& mapping) {
-                       return mapping.m_segmentId == segment.getSegmentId();
-                   }) == mappingContainer.end())
+            bool isWritable = (segment.getWriterGroup() == groupID);
+            bool isReadable = (segment.getReaderGroup() == groupID);
+            if (isWritable || isReadable)
             {
-                mappingContainer.emplace_back(
-                    segment.getWriterGroup().getName(), segment.getSegmentSize(), false, segment.getSegmentId());
+                mappingContainer.emplace_back(segment.getSegmentName(), segment.getSegmentSize(), isWritable, segment.getSegmentId());
+                break;
             }
         }
     }

iceoryx_posh/source/runtime/shared_memory_user.cpp

@@ -73,7 +73,7 @@ void SharedMemoryUser::openDataSegments(const uint64_t segmentId,
     {
         auto accessMode = segment.m_isWritable ? AccessMode::READ_WRITE : AccessMode::READ_ONLY;
         PosixSharedMemoryObjectBuilder()
-            .name(segment.m_sharedMemoryName)
+            .name(segment.m_name)
             .memorySizeInBytes(segment.m_size)
             .accessMode(accessMode)
             .openMode(OpenMode::OPEN_EXISTING)

iceoryx_posh/test/moduletests/test_mepoo_segment.cpp

@@ -1,6 +1,7 @@
 // Copyright (c) 2019 by Robert Bosch GmbH. All rights reserved.
 // Copyright (c) 2021 - 2022 by Apex.AI Inc. All rights reserved.
 // Copyright (c) 2023 by Mathias Kraus <elboberido@m-hias.de>. All rights reserved.
+// Copyright (c) 2024 by Latitude AI. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -138,7 +139,7 @@ class MePooSegment_test : public Test
     std::unique_ptr<SUT> createSut()
     {
         return std::make_unique<SUT>(
-            mepooConfig, m_managementAllocator, PosixGroup{"iox_roudi_test1"}, PosixGroup{"iox_roudi_test2"});
+            "segment_name", mepooConfig, m_managementAllocator, PosixGroup{"iox_roudi_test1"}, PosixGroup{"iox_roudi_test2"});
     }
 };
 MePooSegment_test::SharedMemoryObject_MOCK::createFct MePooSegment_test::SharedMemoryObject_MOCK::createVerificator;
@@ -160,15 +161,23 @@ TEST_F(MePooSegment_test, SharedMemoryCreationParameter)
                                                                        const iox::OpenMode openMode,
                                                                        const void*,
                                                                        const iox::access_rights) {
-        EXPECT_THAT(f_name, Eq(detail::PosixSharedMemory::Name_t("iox_roudi_test2")));
+        EXPECT_THAT(f_name.c_str(), StrEq(detail::PosixSharedMemory::Name_t("segment_name").c_str()));
         EXPECT_THAT(f_accessMode, Eq(iox::AccessMode::READ_WRITE));
         EXPECT_THAT(openMode, Eq(iox::OpenMode::PURGE_AND_CREATE));
     };
-    SUT sut{mepooConfig, m_managementAllocator, PosixGroup{"iox_roudi_test1"}, PosixGroup{"iox_roudi_test2"}};
+    SUT sut{"segment_name", mepooConfig, m_managementAllocator, PosixGroup{"iox_roudi_test1"}, PosixGroup{"iox_roudi_test2"}};
     MePooSegment_test::SharedMemoryObject_MOCK::createVerificator =
         MePooSegment_test::SharedMemoryObject_MOCK::createFct();
 }
 
+TEST_F(MePooSegment_test, GetSegmentName)
+{
+    ::testing::Test::RecordProperty("TEST_ID", "3508ab9c-a59b-48e4-a3f9-da9c0a2742e6");
+
+    auto sut = createSut();
+    EXPECT_THAT(sut->getSegmentName(), Eq(iox::ShmName_t("segment_name")));
+}
+
 TEST_F(MePooSegment_test, GetSegmentSize)
 {
     ::testing::Test::RecordProperty("TEST_ID", "0eee50c0-251e-4313-bb35-d83a0de27ce2");

iceoryx_posh/test/moduletests/test_mepoo_segment_management.cpp

@@ -23,6 +23,7 @@
 #include "iceoryx_posh/mepoo/mepoo_config.hpp"
 #include "iceoryx_posh/mepoo/segment_config.hpp"
 #include "iox/bump_allocator.hpp"
+#include "iox/detail/serialization.hpp"
 #include "iox/posix_group.hpp"
 #include "iox/posix_shared_memory_object.hpp"
 #include "iox/posix_user.hpp"
@@ -38,13 +39,23 @@ using namespace iox::mepoo;
 class MePooSegmentMock
 {
   public:
-    MePooSegmentMock(const MePooConfig& mempoolConfig [[maybe_unused]],
+    MePooSegmentMock(const ShmName_t& name,
+                     const MePooConfig& mempoolConfig [[maybe_unused]],
                      iox::BumpAllocator& managementAllocator [[maybe_unused]],
                      const PosixGroup& readerGroup [[maybe_unused]],
                      const PosixGroup& writerGroup [[maybe_unused]],
                      const MemoryInfo& memoryInfo [[maybe_unused]]) noexcept
+    : m_name(name)
     {
     }
+
+    const ShmName_t& getSegmentName() const noexcept
+    {
+        return m_name;
+    }
+
+  private:
+    ShmName_t m_name;
 };
 
 class SegmentManager_test : public Test
@@ -70,15 +81,15 @@ class SegmentManager_test : public Test
     {
         SegmentConfig config;
         config.m_sharedMemorySegments.emplace_back("segment_name1", "iox_roudi_test1", "iox_roudi_test2", mepooConfig);
-        config.m_sharedMemorySegments.emplace_back("segment_name2", "iox_roudi_test2", "iox_roudi_test3", mepooConfig);
+        config.m_sharedMemorySegments.emplace_back("segment_name2", "iox_roudi_test3", "iox_roudi_test2", mepooConfig);
         return config;
     }
 
-    SegmentConfig getInvalidSegmentConfig()
+    SegmentConfig getSegmentConfigWithSameNameEntries()
     {
         SegmentConfig config;
-        config.m_sharedMemorySegments.emplace_back("segment_name1", "iox_roudi_test1", "iox_roudi_test1", mepooConfig);
-        config.m_sharedMemorySegments.emplace_back("segment_name2", "iox_roudi_test3", "iox_roudi_test1", mepooConfig);
+        config.m_sharedMemorySegments.emplace_back("duplicate_name", "iox_roudi_test1", "iox_roudi_test2", mepooConfig);
+        config.m_sharedMemorySegments.emplace_back("duplicate_name", "iox_roudi_test2", "iox_roudi_test3", mepooConfig);
         return config;
     }
 
@@ -87,7 +98,8 @@ class SegmentManager_test : public Test
         SegmentConfig config;
         for (uint64_t i = 0U; i < iox::MAX_SHM_SEGMENTS; ++i)
         {
-            config.m_sharedMemorySegments.emplace_back("segment_name1", "iox_roudi_test1", "iox_roudi_test1", mepooConfig);
+            auto serial = Serialization::create("segment_name", i);
+            config.m_sharedMemorySegments.emplace_back(ShmName_t(TruncateToCapacity, serial.toString().c_str()), "iox_roudi_test1", "iox_roudi_test1", mepooConfig);
         }
         return config;
     }
@@ -124,7 +136,7 @@ TEST_F(SegmentManager_test, getSegmentMappingsForWriteUser)
     auto sut = createSut();
     auto mapping = sut->getSegmentMappings(PosixUser{"iox_roudi_test2"});
     ASSERT_THAT(mapping.size(), Eq(2u));
-    EXPECT_THAT(mapping[0].m_isWritable == mapping[1].m_isWritable, Eq(false));
+    EXPECT_THAT(mapping[0].m_isWritable == mapping[1].m_isWritable, Eq(true));
 }
 
 TEST_F(SegmentManager_test, getSegmentMappingsEmptyForNonRegisteredUser)
@@ -182,13 +194,12 @@ TEST_F(SegmentManager_test, getMemoryManagerForUserFailWithNonExistingUser)
     EXPECT_FALSE(sut->getSegmentInformationWithWriteAccessForUser(PosixUser{"no_user"}).m_memoryManager.has_value());
 }
 
-TEST_F(SegmentManager_test, addingMoreThanOneWriterGroupFails)
+TEST_F(SegmentManager_test, addingMoreThanOneEntryWithSameNameFails)
 {
-    ::testing::Test::RecordProperty("TEST_ID", "3fa29560-7341-43bf-a22e-2d3550b49e4e");
+    ::testing::Test::RecordProperty("TEST_ID", "7ab2a78a-c9de-4e1d-a2da-6381f9a5a730");
     GTEST_SKIP_FOR_ADDITIONAL_USER() << "This test requires the -DTEST_WITH_ADDITIONAL_USER=ON cmake argument";
 
-    SegmentConfig segmentConfig = getInvalidSegmentConfig();
-    SUT sut{segmentConfig, &allocator};
+    SegmentConfig segmentConfig = getSegmentConfigWithSameNameEntries();
 
     iox::optional<iox::PoshError> detectedError;
     auto errorHandlerGuard = iox::ErrorHandlerMock::setTemporaryErrorHandler<iox::PoshError>(
@@ -197,10 +208,10 @@ TEST_F(SegmentManager_test, addingMoreThanOneWriterGroupFails)
             EXPECT_THAT(errorLevel, Eq(iox::ErrorLevel::FATAL));
         });
 
-    sut.getSegmentMappings(PosixUser("iox_roudi_test1"));
+    SUT sut{segmentConfig, &allocator};
 
     ASSERT_TRUE(detectedError.has_value());
-    EXPECT_THAT(detectedError.value(), Eq(iox::PoshError::MEPOO__USER_WITH_MORE_THAN_ONE_WRITE_SEGMENT));
+    EXPECT_THAT(detectedError.value(), Eq(iox::PoshError::MEPOO__MULTIPLE_SEGMENT_CONFIG_ENTRIES_WITH_SAME_NAME));
 }
 
 TEST_F(SegmentManager_test, addingMaximumNumberOfSegmentsWorks)