bool Connection::sendOutgoingMessage(MessageID messageID, PassOwnPtr<MessageEncoder> encoder)
{
ASSERT(!m_pendingWriteEncoder);
// Just bail if the handle has been closed.
if (m_connectionPipe == INVALID_HANDLE_VALUE)
return false;
// We put the message ID last.
encoder->encode(static_cast<uint32_t>(messageID.toInt()));
// Write the outgoing message.
if (::WriteFile(m_connectionPipe, encoder->buffer(), encoder->bufferSize(), 0, &m_writeState)) {
// We successfully sent this message.
return true;
}
DWORD error = ::GetLastError();
if (error == ERROR_NO_DATA) {
// The pipe is being closed.
connectionDidClose();
return false;
}
if (error != ERROR_IO_PENDING) {
ASSERT_NOT_REACHED();
return false;
}
// The message will be sent soon. Hold onto the encoder so that it won't be destroyed
// before the write completes.
m_pendingWriteEncoder = encoder;
// We can only send one asynchronous message at a time (see comment in platformCanSendOutgoingMessages).
return false;
}
