mirror of https://github.com/PCSX2/pcsx2.git
86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
/* Cpudetection lib
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* Copyright (C) 2002-2016 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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#if defined(_WIN32)
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#include "common/Console.h"
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#include "common/emitter/cpudetect_internal.h"
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void x86capabilities::CountLogicalCores()
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{
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DWORD_PTR vProcessCPUs;
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DWORD_PTR vSystemCPUs;
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LogicalCores = 1;
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if (!GetProcessAffinityMask(GetCurrentProcess(), &vProcessCPUs, &vSystemCPUs))
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return;
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uint CPUs = 0;
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for (DWORD_PTR bit = 1; bit != 0; bit <<= 1)
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if (vSystemCPUs & bit)
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CPUs++;
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LogicalCores = CPUs;
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}
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SingleCoreAffinity::SingleCoreAffinity()
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{
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s_threadId = nullptr;
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s_oldmask = ERROR_INVALID_PARAMETER;
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DWORD_PTR availProcCpus;
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DWORD_PTR availSysCpus;
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if (!GetProcessAffinityMask(GetCurrentProcess(), &availProcCpus, &availSysCpus))
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return;
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int cpu = 0;
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DWORD_PTR affinityMask;
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for (affinityMask = 1; affinityMask != 0; affinityMask <<= 1, ++cpu)
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if (availProcCpus & affinityMask)
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break;
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s_threadId = GetCurrentThread();
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s_oldmask = SetThreadAffinityMask(s_threadId, affinityMask);
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if (s_oldmask == ERROR_INVALID_PARAMETER)
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{
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const int hexWidth = 2 * sizeof(DWORD_PTR);
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Console.Warning(
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"CpuDetect: SetThreadAffinityMask failed...\n"
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"\tSystem Affinity : 0x%0*x\n"
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"\tProcess Affinity: 0x%0*x\n"
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"\tAttempted Thread Affinity CPU: %i",
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hexWidth, availProcCpus, hexWidth, availSysCpus, cpu);
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}
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Sleep(2);
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// Sleep Explained: I arbitrarily pick Core 0 to lock to for running the CPU test. This
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// means that the current thread will need to be switched to Core 0 if it's currently
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// scheduled on a difference cpu/core. However, Windows does not necessarily perform
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// that scheduling immediately upon the call to SetThreadAffinityMask (seems dependent
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// on version: XP does, Win7 does not). So by issuing a Sleep here we give Win7 time
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// to issue a timeslice and move our thread to Core 0. Without this, it tends to move
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// the thread during the cpuSpeed test instead, causing totally wacky results.
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};
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SingleCoreAffinity::~SingleCoreAffinity()
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{
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if (s_oldmask != ERROR_INVALID_PARAMETER)
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SetThreadAffinityMask(s_threadId, s_oldmask);
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}
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#endif
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