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Simplify locking in sp_search and sp_search_pv

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Avoid to take the lock two times in a tight sequence, the first
in get_next_move() and the second to update sp->moves.

Do all with one lock and so retire the now useless locked version
of get_next_move().

Also fix some theorical race due to comparison sp->bestValue < sp->beta
is done out of lock protection. Finally fix another (harmless but time
waster) race that coudl occur because thread_should_stop() is also
called outside of lock protection.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-01-27 17:29:34 +01:00
parent 307909bed8
commit bb968fd42a
4 changed files with 25 additions and 33 deletions
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2
src/movepick.h
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@@ -27,7 +27,6 @@
#include "depth.h"
#include "history.h"
#include "lock.h"
#include "position.h"
@@ -52,7 +51,6 @@ class MovePicker {
public:
MovePicker(const Position& p, Move ttm, Depth d, const History& h, SearchStack* ss = NULL);
Move get_next_move();
Move get_next_move(Lock& lock);
int number_of_evasions() const;
private: