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Only main thread checks time

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The main change of the patch is that now time check
is done only by main thread. In the past, before lazy
SMP, we needed all the threds to check for available
time because main thread could have been blocked on
a split point, now this is no more the case and main
thread can do the job alone, greatly simplifying the logic.

Verified for regression testing on STC with 7 threads:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 11895 W: 1741 L: 1608 D: 8546

No functional change.

Closes #1152
This commit is contained in:
Marco Costalba
2017-06-24 07:15:46 +02:00
committed by Joona Kiiski
parent fa1e3427bd
commit 05513a6641
5 changed files with 27 additions and 66 deletions
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2
src/position.cpp
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@@ -690,7 +690,7 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
assert(is_ok(m));
assert(&newSt != st);
++nodes;
thisThread->nodes.fetch_add(1, std::memory_order_relaxed);
Key k = st->key ^ Zobrist::side;
// Copy some fields of the old state to our new StateInfo object except the