SocketProfilingConnection Class Reference

#include <SocketProfilingConnection.hpp>

Inheritance diagram for SocketProfilingConnection:

Public Member Functions
	SocketProfilingConnection ()
bool	IsOpen () const final
void	Close () final
bool	WritePacket (const unsigned char *buffer, uint32_t length) final
Packet	ReadPacket (uint32_t timeout) final
Public Member Functions inherited from IProfilingConnection
virtual	~IProfilingConnection ()

Detailed Description

Definition at line 18 of file SocketProfilingConnection.hpp.

Constructor & Destructor Documentation

SocketProfilingConnection()

SocketProfilingConnection

(

)

Definition at line 19 of file SocketProfilingConnection.cpp.

References SocketProfilingConnection::Close(), armnnUtils::Sockets::Initialize(), and armnnUtils::Sockets::SetNonBlocking().

{
    Sockets::Initialize();
    memset(m_Socket, 0, sizeof(m_Socket));
    // Note: we're using Linux specific SOCK_CLOEXEC flag.
    m_Socket[0].fd = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
    if (m_Socket[0].fd == -1)
    {
        throw armnn::RuntimeException(std::string("Socket construction failed: ") + strerror(errno));
    }

    // Connect to the named unix domain socket.
    sockaddr_un server{};
    memset(&server, 0, sizeof(sockaddr_un));
    // As m_GatorNamespace begins with a null character we need to ignore that when getting its length.
    memcpy(server.sun_path, m_GatorNamespace, strlen(m_GatorNamespace + 1) + 1);
    server.sun_family = AF_UNIX;
    if (0 != connect(m_Socket[0].fd, reinterpret_cast<const sockaddr*>(&server), sizeof(sockaddr_un)))
    {
        Close();
        throw armnn::RuntimeException(std::string("Cannot connect to stream socket: ") + strerror(errno));
    }

    // Our socket will only be interested in polling reads.
    m_Socket[0].events = POLLIN;

    // Make the socket non blocking.
    if (!Sockets::SetNonBlocking(m_Socket[0].fd))
    {
        Close();
        throw armnn::RuntimeException(std::string("Failed to set socket as non blocking: ") + strerror(errno));
    }
}

Member Function Documentation

Close()

void Close ( )

finalvirtual

Implements IProfilingConnection.

Definition at line 58 of file SocketProfilingConnection.cpp.

References armnnUtils::Sockets::Close().

Referenced by SocketProfilingConnection::ReadPacket(), and SocketProfilingConnection::SocketProfilingConnection().

{
    if (Sockets::Close(m_Socket[0].fd) != 0)
    {
        throw armnn::RuntimeException(std::string("Cannot close stream socket: ") + strerror(errno));
    }

    memset(m_Socket, 0, sizeof(m_Socket));
}

IsOpen()

bool IsOpen ( ) const

finalvirtual

Implements IProfilingConnection.

Definition at line 53 of file SocketProfilingConnection.cpp.

{
    return m_Socket[0].fd > 0;
}

ReadPacket()

Packet ReadPacket ( uint32_t  timeout )

finalvirtual

Implements IProfilingConnection.

Definition at line 78 of file SocketProfilingConnection.cpp.

References SocketProfilingConnection::Close(), armnnUtils::Sockets::Ioctl(), armnnUtils::Sockets::Poll(), and armnnUtils::Sockets::Read().

{
    // Is there currently at least a header worth of data waiting to be read?
    int bytes_available = 0;
    Sockets::Ioctl(m_Socket[0].fd, FIONREAD, &bytes_available);
    if (bytes_available >= 8)
    {
        // Yes there is. Read it:
        return ReceivePacket();
    }

    // Poll for data on the socket or until timeout occurs
    int pollResult = Sockets::Poll(&m_Socket[0], 1, static_cast<int>(timeout));

    switch (pollResult)
    {
    case -1: // Error
        throw armnn::RuntimeException(std::string("Read failure from socket: ") + strerror(errno));

    case 0: // Timeout
        throw TimeoutException("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))
        {
            if (m_Socket[0].revents == POLLNVAL)
            {
                // This is an unrecoverable error.
                Close();
                throw armnn::RuntimeException(std::string("Error while polling receiving socket: POLLNVAL"));
            }
            if (m_Socket[0].revents == POLLERR)
            {
                throw armnn::RuntimeException(std::string("Error while polling receiving socket: POLLERR: ") +
                                              strerror(errno));
            }
            if (m_Socket[0].revents == POLLHUP)
            {
                // This is an unrecoverable error.
                Close();
                throw armnn::RuntimeException(std::string("Connection closed by remote client: POLLHUP"));
            }
        }

        // Check if there is data to read
        if (!(m_Socket[0].revents & (POLLIN)))
        {
            // This is a corner case. The socket as been woken up but not with any data.
            // We'll throw a timeout exception to loop around again.
            throw armnn::TimeoutException("File descriptor was polled but no data was available to receive.");
        }

        return ReceivePacket();
    }
}

WritePacket()

bool WritePacket ( const unsigned char *  buffer, uint32_t  length  )

finalvirtual

Implements IProfilingConnection.

Definition at line 68 of file SocketProfilingConnection.cpp.

References armnnUtils::Sockets::Write().

{
    if (buffer == nullptr || length == 0)
    {
        return false;
    }

    return Sockets::Write(m_Socket[0].fd, buffer, length) != -1;
}

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The documentation for this class was generated from the following files:

• src/profiling/SocketProfilingConnection.hpp
• src/profiling/SocketProfilingConnection.cpp