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Managed languages such as Java and C# are being considered for use in hard real-time systems. A hurdle to their widespread adoption is the lack of garbage collection algorithms that offer predictable space-and-time performance in the face of fragmentation. We introduce SCHISM/CMR, a new concurrent and real-time garbage collector that is fragmentation(More)
Real-time Java is quickly emerging as a platform for building safety-critical embedded systems. The real-time variants of Java, including [8, 15], are attractive alternatives to Ada and C since they provide a cleaner, simpler, and safer programming model. Unfortunately, current real-time Java implementations have trouble scaling down to very hard real-time(More)
Event-based programming is an appealing paradigm for developing pervasive systems since events enable the decoupling of interacting components. Unfortunately, many event-based languages and systems have hardwired notions of physical or logical time and space. This limits their adaptability and target deployment environments, as pervasive systems rely on(More)
—This paper proposes Flow Permissions, an extension to the Android permission mechanism. Unlike the existing permission mechanism our permission mechanism contains semantic information based on information flows. Flow Permissions allow users to examine and grant explicit information flows within an application (e.g., a permission for reading the phone(More)
Managed languages typically use read barriers to interpret forwarding pointers introduced to keep track of copied objects. For example, in a multicore environment with thread-local heaps and a global, shared heap, an object initially allocated on a local heap may be copied to a shared heap if it becomes the source of a store operation whose target location(More)
There has been much recent interest in adding support for real-time capabilities to Android. Proposed architectures for doing so fall into four broad categories, but only two support real-time Android applications. These two proposals include a real-time garbage collector for real-time memory management and a real-time operating system for real-time(More)
Memoization is a well-known optimization technique used to eliminate redundant calls for pure functions. If a call to a function f with argument v yields result r, a subsequent call to f with v can be immediately reduced to r without the need to re-evaluate f's body. Understanding memoization in the presence of concurrency and communication is significantly(More)
MULTIMLTON is an extension of the MLton compiler and runtime system that targets scalable, multicore architectures. It provides specific support for ACML, a derivative of Concurrent ML that allows for the construction of composable asynchronous events. To effectively manage asynchrony, we require the runtime to efficiently handle potentially large numbers(More)
While managed languages such as C# and Java have become quite popular in enterprise computing, they are still considered unsuitable for hard real-time systems. In particular, the presence of garbage collection has been a sore point for their acceptance for low-level system programming tasks. Real-time extensions to these languages have the dubious(More)