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Consider the following program running on a single processor machine: const int n - 50; int tally; void Inc() { int count; for (count = 1; count<=n; count ++) tally++ void Dec() { int count; for (count = 1; count<-n; count ++) tally-- } void main() { tally = 0; parbegin (Inc(),Dec ()); // parbegin executes the functions in parallel vrite tally; (a) What is the lower bound and upper bound on the final value of the shared variable tally in this con- current program. Assume processes can execute at any relative speed and that the value can only be incremented/decremented after it has been loaded into a register by a separate machine instruction. (b) What is the lower an upper bounds if we execute the following process? void main() { tally = 0; parbegin(Inc (), Inc(), Inc()); // parbegin executes the functions in parallel vrite tally; }

Consider the following program running on a single processor machine: const int n - 50; int tally; void Inc() { int count; for (count = 1; count<=n; count ++) tally++ void Dec() { int count; for (count = 1; count<-n; count ++) tally-- } void main() { tally = 0; parbegin (Inc(),Dec ()); // parbegin executes the functions in parallel vrite tally; (a) What is the lower bound and upper bound on the final value of the shared variable tally in this con- current program. Assume processes can execute at any relative speed and that the value can only be incremented/decremented after it has been loaded into a register by a separate machine instruction. (b) What is the lower an upper bounds if we execute the following process? void main() { tally = 0; parbegin(Inc (), Inc(), Inc()); // parbegin executes the functions in parallel vrite tally; }

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Consider the following program running on a single processor machine: const int n = 50; int tally; void Inc() { int count; for (count = 1; count<en; count ++) tally++ void Dec () { int count; for (count = 1; count<-n; count ++) tally-- void main() { tally - 0; parbegin(Inc (),Dec ()); // parbegin executes the functions in parallel write tally; (a) What is the lower bound and upper bound on the final value of the shared variable tally in this con- current program. Assume processes can execute at any relative speed and that the value can only be incremented/decremented after it has been loaded into a register by a separate machine instruction. (b) What is the lower an upper bounds if we execute the following process? void main() { tally - 0; parbegin(Inc (), Inc (), Inc ()); 7/ parbegin executes the functions in parallel write tally;
Transcribed Image Text:Consider the following program running on a single processor machine: const int n = 50; int tally; void Inc() { int count; for (count = 1; count<en; count ++) tally++ void Dec () { int count; for (count = 1; count<-n; count ++) tally-- void main() { tally - 0; parbegin(Inc (),Dec ()); // parbegin executes the functions in parallel write tally; (a) What is the lower bound and upper bound on the final value of the shared variable tally in this con- current program. Assume processes can execute at any relative speed and that the value can only be incremented/decremented after it has been loaded into a register by a separate machine instruction. (b) What is the lower an upper bounds if we execute the following process? void main() { tally - 0; parbegin(Inc (), Inc (), Inc ()); 7/ parbegin executes the functions in parallel write tally;
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