Hi,
Please have a look at the IPC user guide, find the details for how to use the messageQ.
http://processors.wiki.ti.com/index.php/IPC_Users_Guide/MessageQ_Module
The IPC module have the reader and the writer.
The flow of the Reader: The single reader thread calls MessageQ_create(), MessageQ_get(), MessageQ_free(), and MessageQ_delete().
The flow of the Writer: Writer threads call MessageQ_open(), MessageQ_alloc(), MessageQ_put(), and MessageQ_close().
And also see this E2E post for MessageQ_count
http://e2e.ti.com/support/embedded/tirtos/f/355/t/185294.aspx
