Make the debug counters thread safe.
needed to use them in a threaded run. No functional change.pull/2206/head
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@ -145,7 +145,7 @@ const string engine_info(bool to_uci) {
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/// Debug functions used mainly to collect run-time statistics
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static int64_t hits[2], means[2];
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static std::atomic<int64_t> hits[2], means[2];
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void dbg_hit_on(bool b) { ++hits[0]; if (b) ++hits[1]; }
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void dbg_hit_on(bool c, bool b) { if (c) dbg_hit_on(b); }
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