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Task Synchronization in Reservation-Based Real-Time Systems
December 2004 (vol. 53 no. 12)
pp. 1591-1601
In this paper, we present the BandWidth Inheritance (BWI) protocol, a new strategy for scheduling real-time tasks in dynamic systems, which extends the resource reservation framework to systems where tasks can interact through shared resources. The proposed protocol provides temporal isolation between independent groups of tasks and enables a schedulability analysis for guaranteeing the performance of hard real-time tasks. We show that BWI is the natural extension of the well-known Priority Inheritance Protocol to dynamic reservation systems. A formal analysis of the protocol is presented and a guarantee test for hard real-time tasks is proposed that takes into account the case in which hard real-time tasks interact with soft real-time tasks.

[1] T. Ghazalie and T. Baker, “Aperiodic Servers in a Deadline Scheduling Environment,” J. Real-Time Systems, vol. 9, 1995.
[2] M. Caccamo and L. Sha, “Aperiodic Servers with Resource Constraints,” Proc. IEEE Real-Time Systems Symp., Dec. 2001.
[3] D. de Niz, L. Abeni, S. Saewong, and R. Rajkumar, “Resource Sharing in Reservation-Based Systems,” Proc. IEEE Real-Time Systems Symp., Dec. 2001.
[4] L. Abeni and G. Buttazzo, “Integrating Multimedia Applications in Hard Real-Time Systems,” Proc. 19th IEEE Real-Time Systems Symp., Dec. 1998.
[5] L. Sha, R. Rajkumar, and J.P. Lehoczky, “Priority Inheritance Protocols: An Approach to Real-Time Synchronization,” IEEE Trans. Computers, vol. 39, no. 9, Sept. 1990.
[6] Z. Deng and J.W.S. Liu, “Scheduling Real-Time Applications in Open Environment,” Proc. IEEE Real-Time Systems Symp., Dec. 1997.
[7] M. Spuri and G.C. Buttazzo, “Scheduling Aperiodic Tasks in Dynamic Priority Systems,” J. Real-Time Systems, vol. 10, no. 2, 1996.
[8] B. Sprunt, L. Sha, and J. Lehoczky, “Aperiodic Task Scheduling for Hard-Real-Time Systems,” J. Real-Time Systems, vol. 1, July 1989.
[9] J.K. Strosnider, J.P. Lehoczky, and L. Sha, “The Deferrable Server Algorithm for Enhanced Aperiodic Responsiveness in Hard-Real-Time Environments,” IEEE Trans. Computers, vol. 4, no. 1, Jan. 1995.
[10] G. Lipari, “Resource Reservation in Real-Time Systems,” PhD dissertation, Scuola Superiore S. Anna, 2000.
[11] C.W. Mercer, S. Savage, and H. Tokuda, “Processor Capacity Reserves for Multimedia Operating Systems,” Proc. IEEE Int'l Conf. Multimedia Computing and Systems, May 1994.
[12] R. Rajkumar, K. Juvva, A. Molano, and S. Oikawa, “Resource Kernels: A Resource-Centric Approach to Real-Time and Multimedia Systems,” Proc. Fourth Real-Time Computing Systems and Applications Workshop, Nov. 1997.
[13] R. Rajkumar, L. Abeni, D.D. Niz, S. Gosh, A. Miyoshi, and S. Saewong, “Recent Developments with Linux/RK,” Proc. Real Time Linux Workshop, Dec. 2000.
[14] H. Chu and K. Nahrstedt, “CPU Service Classes for Multimedia Applications,” Proc. IEEE Int'l Conf. Mutimedia Computing and Systems, June 1999.
[15] C.L. Liu and J.W. Layland, “Scheduling Algorithms for Multiprogramming in a Hard-Real-Time Environment,” J. ACM, vol. 20, no. 1, 1973.
[16] M. Chen and K. Lin, “Dynamic Priority Ceilings: A Concurrency Control Protocol for Real-Time Systems,” J. Real-Time Systems, vol. 2, 1990.
[17] T.P. Baker, “A Stack-Based Allocation Policy for Realtime Processes,” Proc. IEEE Real-Time Systems Symp., Dec. 1990.
[18] K. Jeffay, “Scheduling Sporadic Tasks with Shared Resources in Hard-Real-Time Systems,” Proc. 13th IEEE Real-Time Systems Symp., pp. 89-99, Dec. 1992.
[19] T.-W. Kuo and C.-H. Li, “Fixed-Priority-Driven Open Environment for Real-Time Applications,” Proc. IEEE Real Systems Symp., Dec. 1999.
[20] L. Abeni, “Server Mechanisms for Multimedia Applications,” Technical Report RETIS TR98-01, Scuola Superiore S. Anna, 1998.
[21] G. Buttazzo, Hard Real-Time Computing Systems: Predictable Scheduling Algorithms and Applications. Kluwer Academic, 1997.
[22] J.A. Stankovic, M. Spuri, K. Ramamritham, and G.C. Buttazzo, Deadline Scheduling for Real-Time Systems— EDF and Related Algorithms. Kluwer Academic, 1998.
[23] L. Abeni and G. Buttazzo, “Adaptive Bandwidth Reservation for Multimedia Computing,” Proc. IEEE Real Time Computing Systems and Applications, Dec. 1999.
[24] G. Buttazzo, G. Lipari, M. Caccamo, and L. Abeni, “Elastic Scheduling for Flexible Workload Management,” IEEE Trans. Computers, vol. 51, no. 3, pp. 289-302 Mar. 2002.
[25] C. Lu, J.A. Stankovic, G. Tao, and S.H. Son, “Design and Evaluation of a Feedback Control EDF Scheduling Algorithm,” Proc. IEEE Real Time Systems Symp., Dec. 1999.

Index Terms:
Real-time scheduling, dynamic system, resource reservation, priority inheritance, constant bandwidth server.
Giuseppe Lipari, Gerardo Lamastra, Luca Abeni, "Task Synchronization in Reservation-Based Real-Time Systems," IEEE Transactions on Computers, vol. 53, no. 12, pp. 1591-1601, Dec. 2004, doi:10.1109/TC.2004.120
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