Fully Parallel Algorithm for Implementing Path Expressions
Fully Parallel Algorithm for Implementing Path Expressions
Anne Dinning
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One variable's key is used to maintain a count on the processes waiting. The other is used to notify the next waiting process and to transfer the value. The binary . Wait, binary_sig, counting. Wait and counting^ig instructions are emulated by the following four routines: count ing. Wait{adr) : while (not sync(adr, [>, 0]. [decrement, 0], [no. Op, 0])) loop ; counting^sig{adr, value) : sync(adr, [no. Op, 0], [store, value], [no_op, 0]); binary. Wait{adrl, adr2) : sync(adrl, [no. Op, 0], [increm...ent-fetch, myJd], [no. Op, 0]); while (not sync(adr2, [=, niyjd], [no. Op, 0], [fetch, value])) loop ; binary. Sig(ac/r2, value) ; sync(adr2, [no. Op. 0], [increment, 0], [store, value]); All variables must by synchronous and accessed only through these routines. Both of these solutions are very simple and provide fair solutions. Moreover, the overhead is negligible if processes do not need to wait. However they all require busy-waiting across the network which can lead to network congestion and greatly reduce the throughput of the machine.
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