The current version of the Safety Critical Java (SCJ) specification defines three compliance levels. Level 0 targets single processor programs while Level 1 and 2 can support multiprocessor platforms. Level 1 programs must be fully partitioned but Level 2 programs can also be more globally scheduled. As of yet, there is no official Reference Implementation for SCJ. However, the icecap project has produced a Safety-Critical Java Run-time Environment based on the Hardware-near Virtual Machine (HVM). This supports SCJ at all compliance levels and provides an implementation of the safety-critical Java (javax.safetycritical) package. This is still work-in-progress and lacks certain key features. Among these is the ability to support multiprocessor platforms. In this paper, we explore two possible options to adding multiprocessor support to this environment: the “green thread” and the “native thread” approaches. The “native thread” approach is adopted and the design and implementation of a revised icecap SCJ run-time environment is discussed.
|Publication date||Oct 2015|
|Number of pages||10|
|Publication status||Published - Oct 2015|
|Event||jtres 2015 - Paris, France|
Duration: 7 Oct 2015 → 8 Oct 2015
|Period||07/10/15 → 08/10/15|