EMERALDS: a small-memory real-time microkernel
Proceedings of the seventeenth ACM symposium on Operating systems principles
EMERALDS: A Small-Memory Real-Time Microkernel
IEEE Transactions on Software Engineering
LFTHREADS: a lock-free thread library
ACM SIGARCH Computer Architecture News
LFTHREADS: a lock-free thread library
OPODIS'07 Proceedings of the 11th international conference on Principles of distributed systems
A signature-based Grid index design for main-memory RFID database applications
Journal of Systems and Software
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In object-oriented programming, updates to the state variables of objects (by the methods of the object) have to be protected through semaphores to ensure mutual exclusion. Semaphore operations are invoked each time an object is accessed, and this represents significant run-time overhead. This is of special concern in cost-conscious, small-size embedded systems -- such as those used in automotive applications -- where costs must be kept to an absolute minimum. Object-oriented programming can be feasible in such applications only if the OS provides efficient, low-overhead semaphores. We present a new semaphore implementation scheme which saves one context switch per semaphore lock operation in most circumstances and gives performance improvements of 18-25% over traditional semaphore implementation schemes.