IVGCVSW-3905 Create a first implementation of the send thread

 * Added the send thread directly to the SendCounterPacket class
 * Updated the SendCounterPacket class constructor to also take a
   reference of a IProfilingConnection object, used to send packets out
 * Added Start and Stop methods to SendCounterPacket to start and
   stop the send thread
 * Added mutex and wait condition to make the send thread waiting for
   something to send
 * This implementation used the old IBufferWrapper interface
 * Added defult (empty) constructor for the Packet class
 * Refactoring of IPeriodicCounterCapture and SocketProfilingConnection
 * Modified WritePacket to make it match IBufferWrapper::GetReadBuffer
 * Added unit test for regular and stress testing of the send thread

Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Change-Id: I8175619ff4e65c0d5be99bcd8bd9d8dd87f717c6

10 files changed, 738 insertions, 123 deletions

diff --git a/src/profiling/IPeriodicCounterCapture.hpp b/src/profiling/IPeriodicCounterCapture.hpp
index 93df9d2541..edc034d20e 100644
--- a/src/profiling/IPeriodicCounterCapture.hpp
+++ b/src/profiling/IPeriodicCounterCapture.hpp
@@ -7,15 +7,15 @@
 
 namespace armnn
 {
-
 namespace profiling
 {
+
 class IPeriodicCounterCapture
 {
 public:
     virtual void Start() = 0;
-    virtual ~IPeriodicCounterCapture() {};
+    virtual ~IPeriodicCounterCapture() {}
 };
 
 } // namespace profiling
-} // namespace armnn
\ No newline at end of file
+} // namespace armnn
diff --git a/src/profiling/IProfilingConnection.hpp b/src/profiling/IProfilingConnection.hpp
index 160a4fa31d..97f7b55477 100644
--- a/src/profiling/IProfilingConnection.hpp
+++ b/src/profiling/IProfilingConnection.hpp
@@ -24,7 +24,7 @@ public:
 
     virtual void Close() =  0;
 
-    virtual bool WritePacket(const char* buffer, uint32_t length) = 0;
+    virtual bool WritePacket(const unsigned char* buffer, uint32_t length) = 0;
 
     virtual Packet ReadPacket(uint32_t timeout) = 0;
 };
diff --git a/src/profiling/Packet.hpp b/src/profiling/Packet.hpp
index 1e047a6511..7d70a48366 100644
--- a/src/profiling/Packet.hpp
+++ b/src/profiling/Packet.hpp
@@ -17,8 +17,16 @@ namespace profiling
 class Packet
 {
 public:
+    Packet()
+        : m_Header(0)
+        , m_Length(0)
+        , m_Data(nullptr)
+    {}
+
     Packet(uint32_t header, uint32_t length, std::unique_ptr<char[]>& data)
-    : m_Header(header), m_Length(length), m_Data(std::move(data))
+        : m_Header(header)
+        , m_Length(length)
+        , m_Data(std::move(data))
     {
         m_PacketId = ((header >> 16) & 1023);
         m_PacketFamily = (header >> 26);
@@ -34,7 +42,8 @@ public:
            m_PacketFamily(other.m_PacketFamily),
            m_PacketId(other.m_PacketId),
            m_Length(other.m_Length),
-           m_Data(std::move(other.m_Data)){};
+           m_Data(std::move(other.m_Data))
+    {}
 
     Packet(const Packet& other) = delete;
     Packet& operator=(const Packet&) = delete;
@@ -48,6 +57,8 @@ public:
     uint32_t GetPacketClass() const;
     uint32_t GetPacketType() const;
 
+    bool IsEmpty() { return m_Header == 0 && m_Length == 0; }
+
 private:
     uint32_t m_Header;
     uint32_t m_PacketFamily;
diff --git a/src/profiling/SendCounterPacket.cpp b/src/profiling/SendCounterPacket.cpp
index b41f53ca24..b222270546 100644
--- a/src/profiling/SendCounterPacket.cpp
+++ b/src/profiling/SendCounterPacket.cpp
@@ -919,7 +919,79 @@ void SendCounterPacket::SendPeriodicCounterSelectionPacket(uint32_t capturePerio
 
 void SendCounterPacket::SetReadyToRead()
 {
-    m_ReadyToRead = true;
+    // Signal the send thread that there's something to read in the buffer
+    m_WaitCondition.notify_one();
+}
+
+void SendCounterPacket::Start()
+{
+    // Check is the send thread is already running
+    if (m_IsRunning.load())
+    {
+        // The send thread is already running
+        return;
+    }
+
+    // Mark the send thread as running
+    m_IsRunning.store(true);
+
+    // Keep the send procedure going until the the send thread is signalled to stop
+    m_KeepRunning.store(true);
+
+    // Start the send thread
+    m_SendThread = std::thread(&SendCounterPacket::Send, this);
+}
+
+void SendCounterPacket::Stop()
+{
+    // Signal the send thread to stop
+    m_KeepRunning.store(false);
+
+    // Check that the send thread is running
+    if (m_SendThread.joinable())
+    {
+        // Kick the send thread out of the wait condition
+        m_WaitCondition.notify_one();
+
+        // Wait for the send thread to complete operations
+        m_SendThread.join();
+    }
+}
+
+void SendCounterPacket::Send()
+{
+    // Keep the sending procedure looping until the thread is signalled to stop
+    while (m_KeepRunning.load())
+    {
+        // Wait condition lock scope - Begin
+        {
+            // Lock the mutex to wait on it
+            std::unique_lock<std::mutex> lock(m_WaitMutex);
+
+            // Wait until the thread is notified of something to read from the buffer, or check anyway after a second
+            m_WaitCondition.wait_for(lock, std::chrono::seconds(1));
+        }
+        // Wait condition lock scope - End
+
+        // Get the data to send from the buffer
+        unsigned int readBufferSize = 0;
+        const unsigned char* readBuffer = m_Buffer.GetReadBuffer(readBufferSize);
+        if (readBuffer == nullptr || readBufferSize == 0)
+        {
+            // Nothing to send, ignore and continue
+            continue;
+        }
+
+        // Check that the profiling connection is open, silently drop the data and continue if it's closed
+        if (m_ProfilingConnection.IsOpen())
+        {
+            // Write a packet to the profiling connection. Silently ignore any write error and continue
+            m_ProfilingConnection.WritePacket(readBuffer, boost::numeric_cast<uint32_t>(readBufferSize));
+        }
+    }
+
+    // Mark the send thread as not running
+    m_IsRunning.store(false);
 }
 
 } // namespace profiling
diff --git a/src/profiling/SendCounterPacket.hpp b/src/profiling/SendCounterPacket.hpp
index 2a2d5d4313..8dd44ecd81 100644
--- a/src/profiling/SendCounterPacket.hpp
+++ b/src/profiling/SendCounterPacket.hpp
@@ -7,7 +7,13 @@
 
 #include "IBufferWrapper.hpp"
 #include "ISendCounterPacket.hpp"
-#include "CounterDirectory.hpp"
+#include "ICounterDirectory.hpp"
+#include "IProfilingConnection.hpp"
+
+#include <atomic>
+#include <mutex>
+#include <thread>
+#include <condition_variable>
 
 namespace armnn
 {
@@ -25,10 +31,13 @@ public:
 
     using IndexValuePairsVector = std::vector<std::pair<uint16_t, uint32_t>>;
 
-    SendCounterPacket(IBufferWrapper& buffer)
-        : m_Buffer(buffer),
-          m_ReadyToRead(false)
+    SendCounterPacket(IProfilingConnection& profilingConnection, IBufferWrapper& buffer)
+        : m_ProfilingConnection(profilingConnection)
+        , m_Buffer(buffer)
+        , m_IsRunning(false)
+        , m_KeepRunning(false)
     {}
+    ~SendCounterPacket() { Stop(); }
 
     void SendStreamMetaDataPacket() override;
 
@@ -44,7 +53,13 @@ public:
     static const unsigned int PIPE_MAGIC = 0x45495434;
     static const unsigned int MAX_METADATA_PACKET_LENGTH = 4096;
 
+    void Start();
+    void Stop();
+    bool IsRunning() { return m_IsRunning.load(); }
+
 private:
+    void Send();
+
     template <typename ExceptionType>
     void CancelOperationAndThrow(const std::string& errorMessage)
     {
@@ -55,8 +70,13 @@ private:
         throw ExceptionType(errorMessage);
     }
 
+    IProfilingConnection& m_ProfilingConnection;
     IBufferWrapper& m_Buffer;
-    bool m_ReadyToRead;
+    std::mutex m_WaitMutex;
+    std::condition_variable m_WaitCondition;
+    std::thread m_SendThread;
+    std::atomic<bool> m_IsRunning;
+    std::atomic<bool> m_KeepRunning;
 
 protected:
     // Helper methods, protected for testing
@@ -78,4 +98,3 @@ protected:
 } // namespace profiling
 
 } // namespace armnn
-
diff --git a/src/profiling/SocketProfilingConnection.cpp b/src/profiling/SocketProfilingConnection.cpp
index 91d57cc9bd..47fc62f7f0 100644
--- a/src/profiling/SocketProfilingConnection.cpp
+++ b/src/profiling/SocketProfilingConnection.cpp
@@ -23,7 +23,7 @@ SocketProfilingConnection::SocketProfilingConnection()
     m_Socket[0].fd = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
     if (m_Socket[0].fd == -1)
     {
-        throw armnn::Exception(std::string(": Socket construction failed: ") + strerror(errno));
+        throw armnn::RuntimeException(std::string("Socket construction failed: ") + strerror(errno));
     }
 
     // Connect to the named unix domain socket.
@@ -35,7 +35,7 @@ SocketProfilingConnection::SocketProfilingConnection()
     if (0 != connect(m_Socket[0].fd, reinterpret_cast<const sockaddr*>(&server), sizeof(sockaddr_un)))
     {
         close(m_Socket[0].fd);
-        throw armnn::Exception(std::string(": Cannot connect to stream socket: ") + strerror(errno));
+        throw armnn::RuntimeException(std::string("Cannot connect to stream socket: ") + strerror(errno));
     }
 
     // Our socket will only be interested in polling reads.
@@ -46,96 +46,92 @@ SocketProfilingConnection::SocketProfilingConnection()
     if (0 != fcntl(m_Socket[0].fd, F_SETFL, currentFlags | O_NONBLOCK))
     {
         close(m_Socket[0].fd);
-        throw armnn::Exception(std::string(": Failed to set socket as non blocking: ") + strerror(errno));
+        throw armnn::RuntimeException(std::string("Failed to set socket as non blocking: ") + strerror(errno));
     }
 }
 
 bool SocketProfilingConnection::IsOpen()
 {
-    if (m_Socket[0].fd > 0)
-    {
-        return true;
-    }
-    return false;
+    return m_Socket[0].fd > 0;
 }
 
 void SocketProfilingConnection::Close()
 {
-    if (0 == close(m_Socket[0].fd))
-    {
-        memset(m_Socket, 0, sizeof(m_Socket));
-    }
-    else
+    if (close(m_Socket[0].fd) != 0)
     {
-        throw armnn::Exception(std::string(": Cannot close stream socket: ") + strerror(errno));
+        throw armnn::RuntimeException(std::string("Cannot close stream socket: ") + strerror(errno));
     }
+
+    memset(m_Socket, 0, sizeof(m_Socket));
 }
 
-bool SocketProfilingConnection::WritePacket(const char* buffer, uint32_t length)
+bool SocketProfilingConnection::WritePacket(const unsigned char* buffer, uint32_t length)
 {
-    if (-1 == write(m_Socket[0].fd, buffer, length))
+    if (buffer == nullptr || length == 0)
     {
         return false;
     }
-    return true;
+
+    return write(m_Socket[0].fd, buffer, length) != -1;
 }
 
 Packet SocketProfilingConnection::ReadPacket(uint32_t timeout)
 {
-    // Poll for data on the socket or until timeout.
+    // Poll for data on the socket or until timeout occurs
     int pollResult = poll(m_Socket, 1, static_cast<int>(timeout));
-    if (pollResult > 0)
+
+    switch (pollResult)
     {
-        // Normal poll return but it could still contain an error signal.
+    case -1: // Error
+        throw armnn::RuntimeException(std::string("Read failure from socket: ") + strerror(errno));
+
+    case 0: // Timeout
+        throw armnn::RuntimeException("Timeout while reading from socket");
+
+    default: // Normal poll return but it could still contain an error signal
+
+        // Check if the socket reported an error
         if (m_Socket[0].revents & (POLLNVAL | POLLERR | POLLHUP))
         {
-            throw armnn::Exception(std::string(": Read failure from socket: ") + strerror(errno));
+            throw armnn::Exception(std::string("Socket 0 reported an error: ") + strerror(errno));
+        }
+
+        // Check if there is data to read
+        if (!(m_Socket[0].revents & (POLLIN)))
+        {
+            // No data to read from the socket. Silently ignore and continue
+            return Packet();
         }
-        else if (m_Socket[0].revents & (POLLIN)) // There is data to read.
+
+        // There is data to read, read the header first
+        char header[8] = {};
+        if (8 != recv(m_Socket[0].fd, &header, sizeof(header), 0))
         {
-            // Read the header first.
-            char header[8];
-            if (8 != recv(m_Socket[0].fd, &header, sizeof header, 0))
-            {
-                // What do we do here if there's not a valid 8 byte header to read?
-                throw armnn::Exception(": Received packet did not contains a valid MIPE header. ");
-            }
-            // stream_metadata_identifier is the first 4 bytes.
-            uint32_t metadataIdentifier = static_cast<uint32_t>(header[0]) << 24 |
-                                          static_cast<uint32_t>(header[1]) << 16 |
-                                          static_cast<uint32_t>(header[2]) << 8  |
-                                          static_cast<uint32_t>(header[3]);
-            // data_length is the next 4 bytes.
-            uint32_t dataLength = static_cast<uint32_t>(header[4]) << 24 |
-                                  static_cast<uint32_t>(header[5]) << 16 |
-                                  static_cast<uint32_t>(header[6]) << 8  |
-                                  static_cast<uint32_t>(header[7]);
-
-            std::unique_ptr<char[]> packetData;
-            if (dataLength > 0)
-            {
-                packetData = std::make_unique<char[]>(dataLength);
-            }
-
-            if (dataLength != recv(m_Socket[0].fd, packetData.get(), dataLength, 0))
-            {
-                // What do we do here if we can't read in a full packet?
-                throw armnn::Exception(": Invalid MIPE packet.");
-            }
-            return {metadataIdentifier, dataLength, packetData};
+            // What do we do here if there's not a valid 8 byte header to read?
+            throw armnn::RuntimeException("The received packet did not contains a valid MIPE header");
         }
-        else // Some unknown return signal.
+
+        // stream_metadata_identifier is the first 4 bytes
+        uint32_t metadataIdentifier = 0;
+        std::memcpy(&metadataIdentifier, header, sizeof(metadataIdentifier));
+
+        // data_length is the next 4 bytes
+        uint32_t dataLength = 0;
+        std::memcpy(&dataLength, header + 4u, sizeof(dataLength));
+
+        std::unique_ptr<char[]> packetData;
+        if (dataLength > 0)
         {
-            throw armnn::Exception(": Poll returned an unexpected event." );
+            packetData = std::make_unique<char[]>(dataLength);
         }
-    }
-    else if (pollResult == -1)
-    {
-        throw armnn::Exception(std::string(": Read failure from socket: ") + strerror(errno));
-    }
-    else // it's 0 so a timeout.
-    {
-        throw armnn::TimeoutException(": Timeout while reading from socket.");
+
+        if (dataLength != recv(m_Socket[0].fd, packetData.get(), dataLength, 0))
+        {
+            // What do we do here if we can't read in a full packet?
+            throw armnn::RuntimeException("Invalid MIPE packet");
+        }
+
+        return Packet(metadataIdentifier, dataLength, packetData);
     }
 }
 
diff --git a/src/profiling/SocketProfilingConnection.hpp b/src/profiling/SocketProfilingConnection.hpp
index f58e1f4d5d..1ae9f17f7e 100644
--- a/src/profiling/SocketProfilingConnection.hpp
+++ b/src/profiling/SocketProfilingConnection.hpp
@@ -21,8 +21,9 @@ public:
     SocketProfilingConnection();
     bool IsOpen() final;
     void Close() final;
-    bool WritePacket(const char* buffer, uint32_t length) final;
+    bool WritePacket(const unsigned char* buffer, uint32_t length) final;
     Packet ReadPacket(uint32_t timeout) final;
+
 private:
     // To indicate we want to use an abstract UDS ensure the first character of the address is 0.
     const char* m_GatorNamespace = "\0gatord_namespace";
diff --git a/src/profiling/test/ProfilingTests.cpp b/src/profiling/test/ProfilingTests.cpp
index b90d469424..1741160f96 100644
--- a/src/profiling/test/ProfilingTests.cpp
+++ b/src/profiling/test/ProfilingTests.cpp
@@ -36,6 +36,7 @@
 #include <map>
 #include <random>
 #include <thread>
+#include <chrono>
 
 BOOST_AUTO_TEST_SUITE(ExternalProfiling)
 
@@ -101,7 +102,7 @@ public:
 
     void Close(){}
 
-    bool WritePacket(const char* buffer, uint32_t length)
+    bool WritePacket(const unsigned char* buffer, uint32_t length)
     {
         return false;
     }
@@ -1754,8 +1755,9 @@ BOOST_AUTO_TEST_CASE(CounterSelectionCommandHandlerParseData)
     uint32_t version = 1;
     Holder holder;
     TestCaptureThread captureThread;
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(512);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
 
     uint32_t sizeOfUint32 = numeric_cast<uint32_t>(sizeof(uint32_t));
     uint32_t sizeOfUint16 = numeric_cast<uint32_t>(sizeof(uint16_t));
@@ -2112,8 +2114,9 @@ BOOST_AUTO_TEST_CASE(CheckPeriodicCounterCaptureThread)
     std::vector<uint16_t> captureIds1 = { 0, 1 };
     std::vector<uint16_t> captureIds2;
 
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(512);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
 
     std::vector<uint16_t> counterIds;
     CaptureReader captureReader;
@@ -2183,8 +2186,9 @@ BOOST_AUTO_TEST_CASE(RequestCounterDirectoryCommandHandlerTest0)
 
     Packet packetA(packetId, 0, packetData);
 
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(1024);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
 
     CounterDirectory counterDirectory;
 
@@ -2217,8 +2221,9 @@ BOOST_AUTO_TEST_CASE(RequestCounterDirectoryCommandHandlerTest1)
 
     Packet packetA(packetId, 0, packetData);
 
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(1024);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
 
     CounterDirectory counterDirectory;
     const Device* device = counterDirectory.RegisterDevice("deviceA", 1);
diff --git a/src/profiling/test/SendCounterPacketTests.cpp b/src/profiling/test/SendCounterPacketTests.cpp
index 90bc9225a0..3dda2e7b37 100644
--- a/src/profiling/test/SendCounterPacketTests.cpp
+++ b/src/profiling/test/SendCounterPacketTests.cpp
@@ -8,6 +8,7 @@
 #include <EncodeVersion.hpp>
 #include <ProfilingUtils.hpp>
 #include <SendCounterPacket.hpp>
+#include <CounterDirectory.hpp>
 
 #include <armnn/Exceptions.hpp>
 #include <armnn/Conversion.hpp>
@@ -16,10 +17,22 @@
 #include <boost/numeric/conversion/cast.hpp>
 
 #include <chrono>
-#include <iostream>
 
 using namespace armnn::profiling;
 
+size_t GetDataLength(const MockStreamCounterBuffer& mockStreamCounterBuffer, size_t packetOffset)
+{
+    // The data length is the written in the second byte
+    return ReadUint32(mockStreamCounterBuffer.GetBuffer(),
+                      boost::numeric_cast<unsigned int>(packetOffset + sizeof(uint32_t)));
+}
+
+size_t GetPacketSize(const MockStreamCounterBuffer& mockStreamCounterBuffer, size_t packetOffset)
+{
+    // The packet size is the data length plus the size of the packet header (always two words big)
+    return GetDataLength(mockStreamCounterBuffer, packetOffset) + 2 * sizeof(uint32_t);
+}
+
 BOOST_AUTO_TEST_SUITE(SendCounterPacketTests)
 
 BOOST_AUTO_TEST_CASE(MockSendCounterPacketTest)
@@ -56,17 +69,18 @@ BOOST_AUTO_TEST_CASE(MockSendCounterPacketTest)
 BOOST_AUTO_TEST_CASE(SendPeriodicCounterSelectionPacketTest)
 {
     // Error no space left in buffer
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer1(10);
-    SendCounterPacket sendPacket1(mockBuffer1);
+    SendCounterPacket sendPacket1(mockProfilingConnection, mockBuffer1);
 
     uint32_t capturePeriod = 1000;
     std::vector<uint16_t> selectedCounterIds;
     BOOST_CHECK_THROW(sendPacket1.SendPeriodicCounterSelectionPacket(capturePeriod, selectedCounterIds),
-                      armnn::profiling::BufferExhaustion);
+                      BufferExhaustion);
 
     // Packet without any counters
     MockBuffer mockBuffer2(512);
-    SendCounterPacket sendPacket2(mockBuffer2);
+    SendCounterPacket sendPacket2(mockProfilingConnection, mockBuffer2);
 
     sendPacket2.SendPeriodicCounterSelectionPacket(capturePeriod, selectedCounterIds);
     unsigned int sizeRead = 0;
@@ -83,7 +97,7 @@ BOOST_AUTO_TEST_CASE(SendPeriodicCounterSelectionPacketTest)
 
     // Full packet message
     MockBuffer mockBuffer3(512);
-    SendCounterPacket sendPacket3(mockBuffer3);
+    SendCounterPacket sendPacket3(mockProfilingConnection, mockBuffer3);
 
     selectedCounterIds.reserve(5);
     selectedCounterIds.emplace_back(100);
@@ -119,8 +133,9 @@ BOOST_AUTO_TEST_CASE(SendPeriodicCounterSelectionPacketTest)
 BOOST_AUTO_TEST_CASE(SendPeriodicCounterCapturePacketTest)
 {
     // Error no space left in buffer
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer1(10);
-    SendCounterPacket sendPacket1(mockBuffer1);
+    SendCounterPacket sendPacket1(mockProfilingConnection, mockBuffer1);
 
     auto captureTimestamp = std::chrono::steady_clock::now();
     uint64_t time =  static_cast<uint64_t >(captureTimestamp.time_since_epoch().count());
@@ -131,7 +146,7 @@ BOOST_AUTO_TEST_CASE(SendPeriodicCounterCapturePacketTest)
 
     // Packet without any counters
     MockBuffer mockBuffer2(512);
-    SendCounterPacket sendPacket2(mockBuffer2);
+    SendCounterPacket sendPacket2(mockProfilingConnection, mockBuffer2);
 
     sendPacket2.SendPeriodicCounterCapturePacket(time, indexValuePairs);
     unsigned int sizeRead = 0;
@@ -149,7 +164,7 @@ BOOST_AUTO_TEST_CASE(SendPeriodicCounterCapturePacketTest)
 
     // Full packet message
     MockBuffer mockBuffer3(512);
-    SendCounterPacket sendPacket3(mockBuffer3);
+    SendCounterPacket sendPacket3(mockProfilingConnection, mockBuffer3);
 
     indexValuePairs.reserve(5);
     indexValuePairs.emplace_back(std::make_pair<uint16_t, uint32_t >(0, 100));
@@ -200,8 +215,9 @@ BOOST_AUTO_TEST_CASE(SendStreamMetaDataPacketTest)
     uint32_t sizeUint32 = numeric_cast<uint32_t>(sizeof(uint32_t));
 
     // Error no space left in buffer
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer1(10);
-    SendCounterPacket sendPacket1(mockBuffer1);
+    SendCounterPacket sendPacket1(mockProfilingConnection, mockBuffer1);
     BOOST_CHECK_THROW(sendPacket1.SendStreamMetaDataPacket(), armnn::profiling::BufferExhaustion);
 
     // Full metadata packet
@@ -220,7 +236,7 @@ BOOST_AUTO_TEST_CASE(SendStreamMetaDataPacketTest)
     uint32_t packetEntries = 6;
 
     MockBuffer mockBuffer2(512);
-    SendCounterPacket sendPacket2(mockBuffer2);
+    SendCounterPacket sendPacket2(mockProfilingConnection, mockBuffer2);
     sendPacket2.SendStreamMetaDataPacket();
     unsigned int sizeRead = 0;
     const unsigned char* readBuffer2 = mockBuffer2.GetReadBuffer(sizeRead);
@@ -313,8 +329,9 @@ BOOST_AUTO_TEST_CASE(SendStreamMetaDataPacketTest)
 
 BOOST_AUTO_TEST_CASE(CreateDeviceRecordTest)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a device for testing
     uint16_t deviceUid = 27;
@@ -345,8 +362,9 @@ BOOST_AUTO_TEST_CASE(CreateDeviceRecordTest)
 
 BOOST_AUTO_TEST_CASE(CreateInvalidDeviceRecordTest)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a device for testing
     uint16_t deviceUid = 27;
@@ -366,8 +384,9 @@ BOOST_AUTO_TEST_CASE(CreateInvalidDeviceRecordTest)
 
 BOOST_AUTO_TEST_CASE(CreateCounterSetRecordTest)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a counter set for testing
     uint16_t counterSetUid = 27;
@@ -398,8 +417,9 @@ BOOST_AUTO_TEST_CASE(CreateCounterSetRecordTest)
 
 BOOST_AUTO_TEST_CASE(CreateInvalidCounterSetRecordTest)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a counter set for testing
     uint16_t counterSetUid = 27;
@@ -419,8 +439,9 @@ BOOST_AUTO_TEST_CASE(CreateInvalidCounterSetRecordTest)
 
 BOOST_AUTO_TEST_CASE(CreateEventRecordTest)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a counter for testing
     uint16_t counterUid = 7256;
@@ -539,8 +560,9 @@ BOOST_AUTO_TEST_CASE(CreateEventRecordTest)
 
 BOOST_AUTO_TEST_CASE(CreateEventRecordNoUnitsTest)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a counter for testing
     uint16_t counterUid = 44312;
@@ -642,8 +664,9 @@ BOOST_AUTO_TEST_CASE(CreateEventRecordNoUnitsTest)
 
 BOOST_AUTO_TEST_CASE(CreateInvalidEventRecordTest1)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a counter for testing
     uint16_t counterUid = 7256;
@@ -680,8 +703,9 @@ BOOST_AUTO_TEST_CASE(CreateInvalidEventRecordTest1)
 
 BOOST_AUTO_TEST_CASE(CreateInvalidEventRecordTest2)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a counter for testing
     uint16_t counterUid = 7256;
@@ -718,8 +742,9 @@ BOOST_AUTO_TEST_CASE(CreateInvalidEventRecordTest2)
 
 BOOST_AUTO_TEST_CASE(CreateInvalidEventRecordTest3)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a counter for testing
     uint16_t counterUid = 7256;
@@ -756,8 +781,9 @@ BOOST_AUTO_TEST_CASE(CreateInvalidEventRecordTest3)
 
 BOOST_AUTO_TEST_CASE(CreateCategoryRecordTest)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a category for testing
     const std::string categoryName = "some_category";
@@ -957,8 +983,9 @@ BOOST_AUTO_TEST_CASE(CreateCategoryRecordTest)
 
 BOOST_AUTO_TEST_CASE(CreateInvalidCategoryRecordTest1)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a category for testing
     const std::string categoryName = "some invalid category";
@@ -980,8 +1007,9 @@ BOOST_AUTO_TEST_CASE(CreateInvalidCategoryRecordTest1)
 
 BOOST_AUTO_TEST_CASE(CreateInvalidCategoryRecordTest2)
 {
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(0);
-    SendCounterPacketTest sendCounterPacketTest(mockBuffer);
+    SendCounterPacketTest sendCounterPacketTest(mockProfilingConnection, mockBuffer);
 
     // Create a category for testing
     const std::string categoryName = "some_category";
@@ -1038,8 +1066,9 @@ BOOST_AUTO_TEST_CASE(SendCounterDirectoryPacketTest1)
     BOOST_CHECK(device2);
 
     // Buffer with not enough space
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(10);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
     BOOST_CHECK_THROW(sendCounterPacket.SendCounterDirectoryPacket(counterDirectory),
                       armnn::profiling::BufferExhaustion);
 }
@@ -1130,8 +1159,9 @@ BOOST_AUTO_TEST_CASE(SendCounterDirectoryPacketTest2)
     BOOST_CHECK(counter3);
 
     // Buffer with enough space
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(1024);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
     BOOST_CHECK_NO_THROW(sendCounterPacket.SendCounterDirectoryPacket(counterDirectory));
 
     // Get the read buffer
@@ -1529,8 +1559,9 @@ BOOST_AUTO_TEST_CASE(SendCounterDirectoryPacketTest3)
     BOOST_CHECK(device);
 
     // Buffer with enough space
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(1024);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
     BOOST_CHECK_THROW(sendCounterPacket.SendCounterDirectoryPacket(counterDirectory), armnn::RuntimeException);
 }
 
@@ -1547,8 +1578,9 @@ BOOST_AUTO_TEST_CASE(SendCounterDirectoryPacketTest4)
     BOOST_CHECK(counterSet);
 
     // Buffer with enough space
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(1024);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
     BOOST_CHECK_THROW(sendCounterPacket.SendCounterDirectoryPacket(counterDirectory), armnn::RuntimeException);
 }
 
@@ -1565,8 +1597,9 @@ BOOST_AUTO_TEST_CASE(SendCounterDirectoryPacketTest5)
     BOOST_CHECK(category);
 
     // Buffer with enough space
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(1024);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
     BOOST_CHECK_THROW(sendCounterPacket.SendCounterDirectoryPacket(counterDirectory), armnn::RuntimeException);
 }
 
@@ -1599,8 +1632,9 @@ BOOST_AUTO_TEST_CASE(SendCounterDirectoryPacketTest6)
     BOOST_CHECK(category);
 
     // Buffer with enough space
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(1024);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
     BOOST_CHECK_THROW(sendCounterPacket.SendCounterDirectoryPacket(counterDirectory), armnn::RuntimeException);
 }
 
@@ -1648,9 +1682,355 @@ BOOST_AUTO_TEST_CASE(SendCounterDirectoryPacketTest7)
     BOOST_CHECK(counter);
 
     // Buffer with enough space
+    MockProfilingConnection mockProfilingConnection;
     MockBuffer mockBuffer(1024);
-    SendCounterPacket sendCounterPacket(mockBuffer);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockBuffer);
     BOOST_CHECK_THROW(sendCounterPacket.SendCounterDirectoryPacket(counterDirectory), armnn::RuntimeException);
 }
 
+BOOST_AUTO_TEST_CASE(SendThreadTest0)
+{
+    MockProfilingConnection mockProfilingConnection;
+    MockStreamCounterBuffer mockStreamCounterBuffer(0);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockStreamCounterBuffer);
+
+    // Try to start the send thread many times, it must only start once
+
+    sendCounterPacket.Start();
+    BOOST_CHECK(sendCounterPacket.IsRunning());
+    sendCounterPacket.Start();
+    sendCounterPacket.Start();
+    sendCounterPacket.Start();
+    sendCounterPacket.Start();
+    BOOST_CHECK(sendCounterPacket.IsRunning());
+
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+
+    sendCounterPacket.Stop();
+    BOOST_CHECK(!sendCounterPacket.IsRunning());
+}
+
+BOOST_AUTO_TEST_CASE(SendThreadTest1)
+{
+    size_t totalWrittenSize = 0;
+
+    MockProfilingConnection mockProfilingConnection;
+    MockStreamCounterBuffer mockStreamCounterBuffer(100);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockStreamCounterBuffer);
+    sendCounterPacket.Start();
+
+    // Interleaving writes and reads to/from the buffer with pauses to test that the send thread actually waits for
+    // something to become available for reading
+
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+
+    CounterDirectory counterDirectory;
+    sendCounterPacket.SendStreamMetaDataPacket();
+
+    // Get the size of the Stream Metadata Packet
+    size_t streamMetadataPacketsize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += streamMetadataPacketsize;
+
+    sendCounterPacket.SetReadyToRead();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    sendCounterPacket.SendCounterDirectoryPacket(counterDirectory);
+
+    // Get the size of the Counter Directory Packet
+    size_t counterDirectoryPacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += counterDirectoryPacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    sendCounterPacket.SendPeriodicCounterCapturePacket(123u,
+                                                       {
+                                                           {   1u,      23u },
+                                                           {  33u, 1207623u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    size_t periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    sendCounterPacket.SendPeriodicCounterCapturePacket(44u,
+                                                       {
+                                                           { 211u,     923u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SendPeriodicCounterCapturePacket(1234u,
+                                                       {
+                                                           { 555u,      23u },
+                                                           { 556u,       6u },
+                                                           { 557u,  893454u },
+                                                           { 558u, 1456623u },
+                                                           { 559u,  571090u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SendPeriodicCounterCapturePacket(997u,
+                                                       {
+                                                           {  88u,      11u },
+                                                           {  96u,      22u },
+                                                           {  97u,      33u },
+                                                           { 999u,     444u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    sendCounterPacket.SendPeriodicCounterSelectionPacket(1000u, { 1345u, 254u, 4536u, 408u, 54u, 6323u, 428u, 1u, 6u });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+
+    // To test an exact value of the "read size" in the mock buffer, wait a second to allow the send thread to
+    // read all what's remaining in the buffer
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+
+    sendCounterPacket.Stop();
+
+    BOOST_CHECK(mockStreamCounterBuffer.GetBufferSize()    == totalWrittenSize);
+    BOOST_CHECK(mockStreamCounterBuffer.GetCommittedSize() == totalWrittenSize);
+    BOOST_CHECK(mockStreamCounterBuffer.GetReadSize()      == totalWrittenSize);
+}
+
+BOOST_AUTO_TEST_CASE(SendThreadTest2)
+{
+    size_t totalWrittenSize = 0;
+
+    MockProfilingConnection mockProfilingConnection;
+    MockStreamCounterBuffer mockStreamCounterBuffer(100);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockStreamCounterBuffer);
+    sendCounterPacket.Start();
+
+    // Adding many spurious "ready to read" signals throughout the test to check that the send thread is
+    // capable of handling unnecessary read requests
+
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+
+    sendCounterPacket.SetReadyToRead();
+
+    CounterDirectory counterDirectory;
+    sendCounterPacket.SendStreamMetaDataPacket();
+
+    // Get the size of the Stream Metadata Packet
+    size_t streamMetadataPacketsize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += streamMetadataPacketsize;
+
+    sendCounterPacket.SetReadyToRead();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    sendCounterPacket.SendCounterDirectoryPacket(counterDirectory);
+
+    // Get the size of the Counter Directory Packet
+    size_t counterDirectoryPacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += counterDirectoryPacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    sendCounterPacket.SendPeriodicCounterCapturePacket(123u,
+                                                       {
+                                                           {   1u,      23u },
+                                                           {  33u, 1207623u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    size_t periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SendPeriodicCounterCapturePacket(44u,
+                                                       {
+                                                           { 211u,     923u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SendPeriodicCounterCapturePacket(1234u,
+                                                       {
+                                                           { 555u,      23u },
+                                                           { 556u,       6u },
+                                                           { 557u,  893454u },
+                                                           { 558u, 1456623u },
+                                                           { 559u,  571090u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SendPeriodicCounterCapturePacket(997u,
+                                                       {
+                                                           {  88u,      11u },
+                                                           {  96u,      22u },
+                                                           {  97u,      33u },
+                                                           { 999u,     444u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+    sendCounterPacket.SendPeriodicCounterSelectionPacket(1000u, { 1345u, 254u, 4536u, 408u, 54u, 6323u, 428u, 1u, 6u });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+
+    // To test an exact value of the "read size" in the mock buffer, wait a second to allow the send thread to
+    // read all what's remaining in the buffer
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+
+    sendCounterPacket.Stop();
+
+    BOOST_CHECK(mockStreamCounterBuffer.GetBufferSize()    == totalWrittenSize);
+    BOOST_CHECK(mockStreamCounterBuffer.GetCommittedSize() == totalWrittenSize);
+    BOOST_CHECK(mockStreamCounterBuffer.GetReadSize()      == totalWrittenSize);
+}
+
+BOOST_AUTO_TEST_CASE(SendThreadTest3)
+{
+    size_t totalWrittenSize = 0;
+
+    MockProfilingConnection mockProfilingConnection;
+    MockStreamCounterBuffer mockStreamCounterBuffer(100);
+    SendCounterPacket sendCounterPacket(mockProfilingConnection, mockStreamCounterBuffer);
+    sendCounterPacket.Start();
+
+    // Not using pauses or "grace periods" to stress test the send thread
+
+    sendCounterPacket.SetReadyToRead();
+
+    CounterDirectory counterDirectory;
+    sendCounterPacket.SendStreamMetaDataPacket();
+
+    // Get the size of the Stream Metadata Packet
+    size_t streamMetadataPacketsize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += streamMetadataPacketsize;
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SendCounterDirectoryPacket(counterDirectory);
+
+    // Get the size of the Counter Directory Packet
+    size_t counterDirectoryPacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += counterDirectoryPacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SendPeriodicCounterCapturePacket(123u,
+                                                       {
+                                                           {   1u,      23u },
+                                                           {  33u, 1207623u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    size_t periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SendPeriodicCounterCapturePacket(44u,
+                                                       {
+                                                           { 211u,     923u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SendPeriodicCounterCapturePacket(1234u,
+                                                       {
+                                                           { 555u,      23u },
+                                                           { 556u,       6u },
+                                                           { 557u,  893454u },
+                                                           { 558u, 1456623u },
+                                                           { 559u,  571090u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SendPeriodicCounterCapturePacket(997u,
+                                                       {
+                                                           {  88u,      11u },
+                                                           {  96u,      22u },
+                                                           {  97u,      33u },
+                                                           { 999u,     444u }
+                                                       });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SetReadyToRead();
+    sendCounterPacket.SendPeriodicCounterSelectionPacket(1000u, { 1345u, 254u, 4536u, 408u, 54u, 6323u, 428u, 1u, 6u });
+
+    // Get the size of the Periodic Counter Capture Packet
+    periodicCounterCapturePacketSize = GetPacketSize(mockStreamCounterBuffer, totalWrittenSize);
+    totalWrittenSize += periodicCounterCapturePacketSize;
+
+    sendCounterPacket.SetReadyToRead();
+
+    // Abruptly terminating the send thread, the amount of data sent may be less that the amount written (the send
+    // thread is not guaranteed to flush the buffer)
+    sendCounterPacket.Stop();
+
+    BOOST_CHECK(mockStreamCounterBuffer.GetBufferSize()    == totalWrittenSize);
+    BOOST_CHECK(mockStreamCounterBuffer.GetCommittedSize() == totalWrittenSize);
+    BOOST_CHECK(mockStreamCounterBuffer.GetReadSize()      <= totalWrittenSize);
+}
+
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/profiling/test/SendCounterPacketTests.hpp b/src/profiling/test/SendCounterPacketTests.hpp
index 5d5dfd14c7..3616816ae2 100644
--- a/src/profiling/test/SendCounterPacketTests.hpp
+++ b/src/profiling/test/SendCounterPacketTests.hpp
@@ -5,24 +5,50 @@
 
 #pragma once
 
-#include "../SendCounterPacket.hpp"
-#include "../ProfilingUtils.hpp"
+#include <SendCounterPacket.hpp>
+#include <ProfilingUtils.hpp>
 
 #include <armnn/Exceptions.hpp>
+#include <armnn/Optional.hpp>
+#include <armnn/Conversion.hpp>
 
-#include <boost/test/unit_test.hpp>
+#include <boost/numeric/conversion/cast.hpp>
 
-#include <chrono>
-#include <iostream>
+namespace armnn
+{
 
-using namespace armnn::profiling;
+namespace profiling
+{
+
+class MockProfilingConnection : public IProfilingConnection
+{
+public:
+    MockProfilingConnection()
+        : m_IsOpen(true)
+    {}
+
+    bool IsOpen() override { return m_IsOpen; }
+
+    void Close() override { m_IsOpen = false; }
+
+    bool WritePacket(const unsigned char* buffer, uint32_t length) override
+    {
+        return buffer != nullptr && length > 0;
+    }
+
+    Packet ReadPacket(uint32_t timeout) override { return Packet(); }
+
+private:
+    bool m_IsOpen;
+};
 
 class MockBuffer : public IBufferWrapper
 {
 public:
     MockBuffer(unsigned int size)
-    : m_BufferSize(size),
-      m_Buffer(std::make_unique<unsigned char[]>(size)) {}
+        : m_BufferSize(size)
+        , m_Buffer(std::make_unique<unsigned char[]>(size))
+    {}
 
     unsigned char* Reserve(unsigned int requestedSize, unsigned int& reservedSize) override
     {
@@ -46,13 +72,115 @@ public:
         return m_Buffer.get();
     }
 
-    void Release( unsigned int size) override {}
+    void Release(unsigned int size) override {}
 
 private:
     unsigned int m_BufferSize;
     std::unique_ptr<unsigned char[]> m_Buffer;
 };
 
+class MockStreamCounterBuffer : public IBufferWrapper
+{
+public:
+    MockStreamCounterBuffer(unsigned int size)
+        : m_Buffer(size, 0)
+        , m_CommittedSize(0)
+        , m_ReadSize(0)
+    {}
+
+    unsigned char* Reserve(unsigned int requestedSize, unsigned int& reservedSize) override
+    {
+        std::unique_lock<std::mutex>(m_Mutex);
+
+        // Get the buffer size and the available size in the buffer past the committed size
+        size_t bufferSize = m_Buffer.size();
+        size_t availableSize = bufferSize - m_CommittedSize;
+
+        // Check whether the buffer needs to be resized
+        if (requestedSize > availableSize)
+        {
+            // Resize the buffer
+            size_t newSize = m_CommittedSize + requestedSize;
+            m_Buffer.resize(newSize, 0);
+        }
+
+        // Set the reserved size
+        reservedSize = requestedSize;
+
+        // Get a pointer to the beginning of the part of buffer available for writing
+        return m_Buffer.data() + m_CommittedSize;
+    }
+
+    void Commit(unsigned int size) override
+    {
+        std::unique_lock<std::mutex>(m_Mutex);
+
+        // Update the committed size
+        m_CommittedSize += size;
+    }
+
+    const unsigned char* GetReadBuffer(unsigned int& size) override
+    {
+        std::unique_lock<std::mutex>(m_Mutex);
+
+        // Get the size available for reading
+        size = boost::numeric_cast<unsigned int>(m_CommittedSize - m_ReadSize);
+
+        // Get a pointer to the beginning of the part of buffer available for reading
+        const unsigned char* readBuffer = m_Buffer.data() + m_ReadSize;
+
+        // Update the read size
+        m_ReadSize = m_CommittedSize;
+
+        return readBuffer;
+    }
+
+    void Release(unsigned int size) override
+    {
+        std::unique_lock<std::mutex>(m_Mutex);
+
+        if (size == 0)
+        {
+            // Nothing to release
+            return;
+        }
+
+        // Get the buffer size
+        size_t bufferSize = m_Buffer.size();
+
+        // Remove the last "size" bytes from the buffer
+        if (size < bufferSize)
+        {
+            // Resize the buffer
+            size_t newSize = bufferSize - size;
+            m_Buffer.resize(newSize);
+        }
+        else
+        {
+            // Clear the whole buffer
+            m_Buffer.clear();
+        }
+    }
+
+    size_t GetBufferSize()           const { return m_Buffer.size(); }
+    size_t GetCommittedSize()        const { return m_CommittedSize; }
+    size_t GetReadSize()             const { return m_ReadSize;      }
+    const unsigned char* GetBuffer() const { return m_Buffer.data(); }
+
+private:
+    // This mock uses an ever-expanding vector to simulate a counter stream buffer
+    std::vector<unsigned char> m_Buffer;
+
+    // The size of the buffer that has been committed for reading
+    size_t m_CommittedSize;
+
+    // The size of the buffer that has already been read
+    size_t m_ReadSize;
+
+    // This mock buffer provides basic synchronization
+    std::mutex m_Mutex;
+};
+
 class MockSendCounterPacket : public ISendCounterPacket
 {
 public:
@@ -93,8 +221,7 @@ public:
         m_Buffer.Commit(reserved);
     }
 
-    void SetReadyToRead() override
-    {}
+    void SetReadyToRead() override {}
 
 private:
     IBufferWrapper& m_Buffer;
@@ -307,8 +434,8 @@ private:
 class SendCounterPacketTest : public SendCounterPacket
 {
 public:
-    SendCounterPacketTest(IBufferWrapper& buffer)
-        : SendCounterPacket(buffer)
+    SendCounterPacketTest(IProfilingConnection& profilingconnection, IBufferWrapper& buffer)
+        : SendCounterPacket(profilingconnection, buffer)
     {}
 
     bool CreateDeviceRecordTest(const DevicePtr& device,
@@ -340,3 +467,7 @@ public:
         return CreateCategoryRecord(category, counters, categoryRecord, errorMessage);
     }
 };
+
+} // namespace profiling
+
+} // namespace armnn