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Simplify locking in splitpoint search

Browse source 
One rule: Always lock before picking up a move.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-02-24 16:44:34 +02:00 • committed by Marco Costalba
parent 3c31776a20
commit 936cd5b83d
2 changed files with 34 additions and 43 deletions
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5
src/lock.h
View file

@ -99,9 +99,4 @@ typedef CRITICAL_SECTION Lock;
#endif
static inline bool lock_grab_bool(Lock* x) {
lock_grab(x);
return true;
}
#endif // !defined(LOCK_H_INCLUDED)

72
src/search.cpp
View file

@ -1797,8 +1797,9 @@ namespace {
bool useFutilityPruning = sp->depth < 7 * OnePly //FIXME: sync with search
&& !isCheck;
while ( lock_grab_bool(&(sp->lock))
&& sp->bestValue < sp->beta
lock_grab(&(sp->lock));
while ( sp->bestValue < sp->beta
&& !TM.thread_should_stop(threadID)
&& (move = sp->mp->get_next_move()) != MOVE_NONE)
{
@ -1826,20 +1827,20 @@ namespace {
if ( moveCount >= futility_move_count(sp->depth)
&& ok_to_prune(pos, move, ss[sp->ply].threatMove)
&& sp->bestValue > value_mated_in(PLY_MAX))
{
lock_grab(&(sp->lock));
continue;
}
// Value based pruning
Value futilityValueScaled = sp->futilityValue - moveCount * 8; //FIXME: sync with search
if (futilityValueScaled < sp->beta)
{
if (futilityValueScaled > sp->bestValue) // Less then 1% of cases
{
lock_grab(&(sp->lock));
if (futilityValueScaled > sp->bestValue)
sp->bestValue = futilityValueScaled;
lock_release(&(sp->lock));
}
lock_grab(&(sp->lock));
if (futilityValueScaled > sp->bestValue)
sp->bestValue = futilityValueScaled;
continue;
}
}
@ -1875,26 +1876,23 @@ namespace {
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
// New best move?
if (value > sp->bestValue) // Less then 2% of cases
lock_grab(&(sp->lock));
if (value > sp->bestValue && !TM.thread_should_stop(threadID))
{
lock_grab(&(sp->lock));
if (value > sp->bestValue && !TM.thread_should_stop(threadID))
sp->bestValue = value;
if (sp->bestValue >= sp->beta)
{
sp->bestValue = value;
if (sp->bestValue >= sp->beta)
{
sp->stopRequest = true;
sp_update_pv(sp->parentSstack, ss, sp->ply);
}
sp->stopRequest = true;
sp_update_pv(sp->parentSstack, ss, sp->ply);
}
lock_release(&(sp->lock));
}
}
/* Here we have the lock still grabbed */
sp->cpus--;
sp->slaves[threadID] = 0;
sp->cpus--;
lock_release(&(sp->lock));
}
@ -1920,8 +1918,9 @@ namespace {
int moveCount;
Move move;
while ( lock_grab_bool(&(sp->lock))
&& sp->alpha < sp->beta
lock_grab(&(sp->lock));
while ( sp->alpha < sp->beta
&& !TM.thread_should_stop(threadID)
&& (move = sp->mp->get_next_move()) != MOVE_NONE)
{
@ -1982,33 +1981,30 @@ namespace {
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
// New best move?
if (value > sp->bestValue) // Less then 2% of cases
lock_grab(&(sp->lock));
if (value > sp->bestValue && !TM.thread_should_stop(threadID))
{
lock_grab(&(sp->lock));
if (value > sp->bestValue && !TM.thread_should_stop(threadID))
sp->bestValue = value;
if (value > sp->alpha)
{
sp->bestValue = value;
if (value > sp->alpha)
{
// Ask threads to stop before to modify sp->alpha
if (value >= sp->beta)
sp->stopRequest = true;
// Ask threads to stop before to modify sp->alpha
if (value >= sp->beta)
sp->stopRequest = true;
sp->alpha = value;
sp->alpha = value;
sp_update_pv(sp->parentSstack, ss, sp->ply);
if (value == value_mate_in(sp->ply + 1))
ss[sp->ply].mateKiller = move;
}
sp_update_pv(sp->parentSstack, ss, sp->ply);
if (value == value_mate_in(sp->ply + 1))
ss[sp->ply].mateKiller = move;
}
lock_release(&(sp->lock));
}
}
/* Here we have the lock still grabbed */
sp->cpus--;
sp->slaves[threadID] = 0;
sp->cpus--;
lock_release(&(sp->lock));
}