Threads in the new ISO C Standard from 2011
Threads in the new ISO C Standard from 2011
Threads in the new ISO C Standard from 2011
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Cumulative Order<strong>in</strong>g<br />
If <strong>the</strong> memory accesses ordered by a memory barrier executed by one<br />
processor Pi also take <strong>in</strong>to account memory accesses executed by<br />
o<strong>the</strong>r processors as described below <strong>the</strong> barrier is cumulative.<br />
By applicable storage accesses for a barrier is meant <strong>the</strong> storage<br />
access which are ordered by that barrier.<br />
Two rules:<br />
The A-set also <strong>in</strong>cludes all applicable storage accesses made by o<strong>the</strong>r<br />
processors which have completed with respect to Pi before <strong>the</strong> barrier<br />
is created (by execut<strong>in</strong>g <strong>the</strong> barrier <strong>in</strong>struction).<br />
The B-set also <strong>in</strong>cludes all applicable accesses made by any processor<br />
Pj after Pj has executed a load that returned a value stored by an<br />
<strong>in</strong>struction <strong>in</strong> <strong>the</strong> B-set.<br />
The B-set expands recursively.<br />
Jonas Skeppstedt (js@cs.lth.se) Lecture 6 2013 55 / 70
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