mirror of https://github.com/PCSX2/pcsx2.git
121 lines
2.5 KiB
C++
121 lines
2.5 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2021 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "GS.h"
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// http://software.intel.com/en-us/blogs/2012/11/06/exploring-intel-transactional-synchronization-extensions-with-intel-software
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#if 0
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class TransactionScope
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{
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public:
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class Lock
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{
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std::atomic<bool> state;
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public:
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Lock()
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: state(false)
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{
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}
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void lock()
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{
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bool expected_value = false;
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while(state.compare_exchange_strong(expected_value, true))
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{
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do {_mm_pause();} while(state);
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}
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}
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void unlock()
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{
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state = false;
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}
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bool isLocked() const
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{
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return state.load();
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}
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};
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private:
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Lock& fallBackLock;
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TransactionScope();
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public:
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TransactionScope(Lock& fallBackLock_, int max_retries = 3)
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: fallBackLock(fallBackLock_)
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{
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// The TSX (RTM/HLE) instructions on Intel AVX2 CPUs may either be
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// absent or disabled (see errata HSD136 and specification change at
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// http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/4th-gen-core-family-desktop-specification-update.pdf)
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// This can cause builds for AVX2 CPUs to fail with GCC/Clang on Linux,
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// so check that the RTM instructions are actually available.
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#if (_M_SSE >= 0x501 && !defined(__GNUC__)) || defined(__RTM__)
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int nretries = 0;
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while(1)
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{
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++nretries;
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unsigned status = _xbegin();
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if(status == _XBEGIN_STARTED)
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{
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if(!fallBackLock.isLocked()) return;
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_xabort(0xff);
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}
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if((status & _XABORT_EXPLICIT) && _XABORT_CODE(status) == 0xff && !(status & _XABORT_NESTED))
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{
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while(fallBackLock.isLocked()) _mm_pause();
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}
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else if(!(status & _XABORT_RETRY))
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{
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break;
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}
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if(nretries >= max_retries)
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{
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break;
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}
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}
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#endif
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fallBackLock.lock();
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}
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~TransactionScope()
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{
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if(fallBackLock.isLocked())
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{
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fallBackLock.unlock();
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}
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#if (_M_SSE >= 0x501 && !defined(__GNUC__)) || defined(__RTM__)
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else
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{
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_xend();
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}
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#endif
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}
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};
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#endif
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