Multiprocessor Ada platform based on MaRTE OS and GNAT

This paper presents the implementation of a multiprocessor Ada platform based on MaRTE OS and GNAT. The paper describes the modifications required to adapt MaRTE OS to a multiprocessor architecture, namely the protection of the internal data structures against concurrent access and the management of several ready queues. We also describe the adaptation of the GNAT run-time library in order to be used on top of the multiprocessor services provided by MaRTE OS. The developed MaRTE/GNAT platform provides full Ada tasking functionality and the multiprocessor support defined in the Ravenscar profile. Two multiprocessor architectures are supported: the multiprocessor version of the XtratuM hypervisor for Intel x86 architecture and the Linux operating system (with MaRTE taking the role of a Pthreads multiprocessor library).