Fix obey the "maxThreadsPerSplitPoint" setting
Spotted by Joona. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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@ -281,26 +281,26 @@ Value ThreadsManager::split(Position& pos, SearchStack* ss, Value alpha, Value b
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// If we are here it means we are not available
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assert(masterThread.state == Thread::SEARCHING);
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int booked = 0;
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int workersCnt = 1; // At least the master is included
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// Try to allocate available threads setting state to Thread::BOOKED, this
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// must be done under lock protection to avoid concurrent allocation of
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// the same slave by another master.
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lock_grab(&threadsLock);
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for (i = 0; !Fake && i < activeThreads && booked < maxThreadsPerSplitPoint; i++)
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for (i = 0; !Fake && i < activeThreads && workersCnt < maxThreadsPerSplitPoint; i++)
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if (i != master && threads[i].is_available_to(master))
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{
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threads[i].state = Thread::BOOKED;
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threads[i].splitPoint = &splitPoint;
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splitPoint.is_slave[i] = true;
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booked++;
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workersCnt++;
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}
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lock_release(&threadsLock);
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// We failed to allocate even one slave, return
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if (!Fake && !booked)
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if (!Fake && workersCnt == 1)
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return bestValue;
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masterThread.activeSplitPoints++;
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