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Commit ID 3cb02004596f868ae405b09fbf3a2038a680a989
Author Joost VandeVondele
Date 2017-06-21 20:37:58 UTC
Fix four data races. the nodes, tbHits, rootDepth and lastInfoTime variables are read by multiple threads, but not declared atomic, leading to data races as found by -fsanitize=thread. This patch fixes this issue. It is based on top of the CI-threading branch (PR #1129), and should fix the corresponding CI error messages. The patch passed an STC check for no regression: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 169597 W: 29938 L: 30066 D: 109593 Whereas rootDepth and lastInfoTime are not performance critical, nodes and tbHits are. Indeed, an earlier version using relaxed atomic updates on the latter two variables failed STC testing (, which can be shown to be due to x86-32 ( Indeed, the latter have no instruction to atomically update a 64bit variable. The proposed solution thus uses a variable in Position that is accessed only by one thread, which is copied every few thousand nodes to the shared variable in Thread. No functional change. Closes #1130 Closes #1129
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