Protected Shared Variables in VHDL: IEEE Standard 1076a

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http://doi.ieeecomputersociety.org/10.1109/54.808221

October-December 1999 (vol. 16 no. 4) pp. 74-83

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	Peter J. Ashenden, Philip A. Wilsey, "Protected Shared Variables in VHDL: IEEE Standard 1076a," IEEE Design and Test of Computers, vol. 16, no. 4, pp. 74-83, October-December, 1999.

	BibTex	x
	@article{ 10.1109/54.808221, author = {Peter J. Ashenden and Philip A. Wilsey}, title = {Protected Shared Variables in VHDL: IEEE Standard 1076a}, journal ={IEEE Design and Test of Computers}, volume = {16}, number = {4}, issn = {0740-7475}, year = {1999}, pages = {74-83}, doi = {http://doi.ieeecomputersociety.org/10.1109/54.808221}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA, USA}, }

	RefWorks Procite/RefMan/Endnote	x
	TY - MGZN JO - IEEE Design and Test of Computers TI - Protected Shared Variables in VHDL: IEEE Standard 1076a IS - 4 SN - 0740-7475 SP74 EP83 EPD - 74-83 A1 - Peter J. Ashenden, A1 - Philip A. Wilsey, PY - 1999 KW - VHDL KW - shared variables KW - protected types KW - monitors VL - 16 JA - IEEE Design and Test of Computers ER -

Peter J. Ashenden

Philip A. Wilsey

The VHDL standard currently allows concurrent access to variables shared between processes, but does not define any semantics for concurrency control. The IEEE 1076a Shared Variables Working Group has developed a form of monitors, called protected types, to provide mutually exclusive access to shared variables. This article identifies the problems that can arise from unprotected concurrent access to shared variables and reviews the idea of monitors, which forms the basis of the proposed language change. It describes protected types, gives some guidelines on using them for hardware modeling, and includes examples to illustrate their use.

Index Terms:

VHDL, shared variables, protected types, monitors

Citation:

Peter J. Ashenden, Philip A. Wilsey, "Protected Shared Variables in VHDL: IEEE Standard 1076a," IEEE Design and Test of Computers, vol. 16, no. 4, pp. 74-83, Oct.-Dec. 1999, doi:10.1109/54.808221

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