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Simplify idle_loop() signature

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We can detect the split point master also from within idle_loop,
so we can call the function without parameters and remove an
overloaded member hack in Thread class.

Note that we don't need to take a lock around curSplitPoint
when entering idle_loop() because if we are the master then
curSplitPoint cannot change under our feet (because is_searching
is set and so we cannot be reallocated), if we are a slave
we enter idle_loop() only upon Thread creation and in that case
is always splitPointsCnt == 0. This is true even in the very rare
case that curSplitPoint != NULL, if we have been already allocated
even before entering idle_loop().

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-08-19 11:20:33 +01:00
parent 4b19430103
commit dba1bc354a
3 changed files with 11 additions and 9 deletions
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5
src/thread.cpp
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@@ -365,12 +365,11 @@ Value ThreadPool::split(Position& pos, Stack* ss, Value alpha, Value beta,
// Everything is set up. The master thread enters the idle loop, from which
// it will instantly launch a search, because its is_searching flag is set.
// We pass the split point as a parameter to the idle loop, which means that
// the thread will return from the idle loop when all slaves have finished
// The thread will return from the idle loop when all slaves have finished
// their work at this split point.
if (slavesCnt || Fake)
{
master->idle_loop(sp);
master->idle_loop();
// In helpful master concept a master can help only a sub-tree of its split
// point, and because here is all finished is not possible master is booked.