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Avoid a needless locking in sp_search()

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Only in less then 2% of cases we have a new sp->bestValue,
so check before to lock and save a costly locking
most of the times.

Patch suggested by Joona.

No functional search.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-10-19 07:44:06 +01:00
parent f0b0a3b135
commit 51c3af9dd0
1 changed files with 14 additions and 11 deletions
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25
src/search.cpp
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@ -1759,21 +1759,24 @@ namespace {
break; break;
// New best move? // New best move?
lock_grab(&(sp->lock)); if (value > sp->bestValue) // Less then 2% of cases
if (value > sp->bestValue && !thread_should_stop(threadID))
{ {
sp->bestValue = value; lock_grab(&(sp->lock));
if (sp->bestValue >= sp->beta) if (value > sp->bestValue && !thread_should_stop(threadID))
{ {
sp_update_pv(sp->parentSstack, ss, sp->ply); sp->bestValue = value;
for (int i = 0; i < ActiveThreads; i++) if (sp->bestValue >= sp->beta)
if (i != threadID && (i == sp->master || sp->slaves[i])) {
Threads[i].stop = true; sp_update_pv(sp->parentSstack, ss, sp->ply);
for (int i = 0; i < ActiveThreads; i++)
if (i != threadID && (i == sp->master || sp->slaves[i]))
Threads[i].stop = true;
sp->finished = true; sp->finished = true;
} }
}
lock_release(&(sp->lock));
} }
lock_release(&(sp->lock));
} }
lock_grab(&(sp->lock)); lock_grab(&(sp->lock));