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  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
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  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
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  Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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  Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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  Stockfish is free software: you can redistribute it and/or modify
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  Stockfish is free software: you can redistribute it and/or modify
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  it under the terms of the GNU General Public License as published by
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  it under the terms of the GNU General Public License as published by
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  the Free Software Foundation, either version 3 of the License, or
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  the Free Software Foundation, either version 3 of the License, or
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  (at your option) any later version.
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  (at your option) any later version.
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#ifdef _WIN32
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#ifdef _WIN32
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#if _WIN32_WINNT < 0x0601
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#if _WIN32_WINNT < 0x0601
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#undef  _WIN32_WINNT
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#undef  _WIN32_WINNT
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#define _WIN32_WINNT 0x0601 // Force to include needed API prototypes
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#define _WIN32_WINNT 0x0601 // Force to include needed API prototypes
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#endif
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#endif
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif
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#include <windows.h>
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#include <windows.h>
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// The needed Windows API for processor groups could be missed from old Windows
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// The needed Windows API for processor groups could be missed from old Windows
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// versions, so instead of calling them directly (forcing the linker to resolve
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// versions, so instead of calling them directly (forcing the linker to resolve
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// the calls at compile time), try to load them at runtime. To do this we need
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// the calls at compile time), try to load them at runtime. To do this we need
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// first to define the corresponding function pointers.
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// first to define the corresponding function pointers.
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namespace {
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namespace {
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/// Version number. If Version is left empty, then compile date in the format
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/// Version number. If Version is left empty, then compile date in the format
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/// DD-MM-YY and show in engine_info.
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/// DD-MM-YY and show in engine_info.
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const string Version = "9";
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const string Version = "10";
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/// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
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/// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
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/// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
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/// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
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/// can toggle the logging of std::cout and std:cin at runtime whilst preserving
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/// can toggle the logging of std::cout and std:cin at runtime whilst preserving
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/// usual I/O functionality, all without changing a single line of code!
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/// usual I/O functionality, all without changing a single line of code!
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void bindThisThread(size_t) {}
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void bindThisThread(size_t) {}
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#else
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#else
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/// get_group() retrieves logical processor information using Windows specific
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/// best_group() retrieves logical processor information using Windows specific
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/// API and returns the best group id for the thread with index idx. Original
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/// API and returns the best group id for the thread with index idx. Original
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/// code from Texel by Peter Österlund.
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/// code from Texel by Peter Österlund.
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int get_group(size_t idx) {
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int best_group(size_t idx) {
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  int threads = 0;
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  int threads = 0;
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  int nodes = 0;
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  int nodes = 0;
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  int cores = 0;
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  int cores = 0;
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  DWORD returnLength = 0;
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  DWORD returnLength = 0;
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  DWORD byteOffset = 0;
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  DWORD byteOffset = 0;
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  // Early exit if the needed API is not available at runtime
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  // Early exit if the needed API is not available at runtime
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  HMODULE k32 = GetModuleHandle("Kernel32.dll");
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  HMODULE k32 = GetModuleHandle("Kernel32.dll");
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  auto fun1 = (fun1_t)GetProcAddress(k32, "GetLogicalProcessorInformationEx");
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  auto fun1 = (fun1_t)(void(*)())GetProcAddress(k32, "GetLogicalProcessorInformationEx");
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  if (!fun1)
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  if (!fun1)
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      return -1;
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      return -1;
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  // First call to get returnLength. We expect it to fail due to null buffer
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  // First call to get returnLength. We expect it to fail due to null buffer
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  if (fun1(RelationAll, nullptr, &returnLength))
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  if (fun1(RelationAll, nullptr, &returnLength))
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/// bindThisThread() set the group affinity of the current thread
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/// bindThisThread() set the group affinity of the current thread
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void bindThisThread(size_t idx) {
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void bindThisThread(size_t idx) {
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  // Use only local variables to be thread-safe
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  // Use only local variables to be thread-safe
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  int group = get_group(idx);
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  int group = best_group(idx);
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  if (group == -1)
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  if (group == -1)
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      return;
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      return;
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  // Early exit if the needed API are not available at runtime
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  // Early exit if the needed API are not available at runtime
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  HMODULE k32 = GetModuleHandle("Kernel32.dll");
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  HMODULE k32 = GetModuleHandle("Kernel32.dll");
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  auto fun2 = (fun2_t)GetProcAddress(k32, "GetNumaNodeProcessorMaskEx");
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  auto fun2 = (fun2_t)(void(*)())GetProcAddress(k32, "GetNumaNodeProcessorMaskEx");
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  auto fun3 = (fun3_t)GetProcAddress(k32, "SetThreadGroupAffinity");
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  auto fun3 = (fun3_t)(void(*)())GetProcAddress(k32, "SetThreadGroupAffinity");
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  if (!fun2 || !fun3)
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  if (!fun2 || !fun3)
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      return;
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      return;
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  GROUP_AFFINITY affinity;
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  GROUP_AFFINITY affinity;