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Use thread_local compiler specifics

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Much faster then pthread_getspecific() but still a
speed regression against the original code.

Following are the nps on a bench:

Position
454165
454838
455433

tls
441046
442767
442767

ms (Win)
450521
447510
451105

ms (pthread)
422115
422115
424276

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-04-06 17:01:41 +01:00
parent bed4075580
commit b1f57e92ce
7 changed files with 17 additions and 24 deletions
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9
src/thread.cpp
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@@ -28,6 +28,7 @@
using namespace Search;
ThreadsManager Threads; // Global object
THREAD_LOCAL Thread* this_thread; // Thread local variable
namespace { extern "C" {
@@ -36,7 +37,7 @@ namespace { extern "C" {
long start_routine(Thread* th) {
Threads.set_this_thread(th); // Save pointer into thread local storage
this_thread = th; // Save pointer into thread local storage
(th->*(th->start_fn))();
return 0;
}
@@ -205,12 +206,11 @@ bool Thread::is_available_to(Thread* master) const {
void ThreadsManager::init() {
tls_init(tlsKey);
cond_init(sleepCond);
lock_init(splitLock);
timer = new Thread(&Thread::timer_loop);
threads.push_back(new Thread(&Thread::main_loop));
set_this_thread(main_thread()); // Use main thread's resources
this_thread = main_thread(); // Use main thread's resources
read_uci_options();
}
@@ -225,7 +225,6 @@ ThreadsManager::~ThreadsManager() {
delete timer;
lock_destroy(splitLock);
cond_destroy(sleepCond);
tls_destroy(tlsKey);
}
@@ -314,7 +313,7 @@ Value ThreadsManager::split(Position& pos, Stack* ss, Value alpha, Value beta,
assert(beta <= VALUE_INFINITE);
assert(depth > DEPTH_ZERO);
Thread* master = this_thread();
Thread* master = this_thread;
if (master->splitPointsCnt >= MAX_SPLITPOINTS_PER_THREAD)
return bestValue;