mirror of
https://github.com/gnif/LookingGlass.git
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97 lines
No EOL
2.5 KiB
C++
97 lines
No EOL
2.5 KiB
C++
/*
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KVMGFX Client - A KVM Client for VGA Passthrough
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Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "MTMemcpy.h"
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MTMemcpy::MTMemcpy() :
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m_initialized(false)
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{
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}
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MTMemcpy::~MTMemcpy()
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{
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DeInitialize();
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}
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DWORD WINAPI MTMemcpy::thread_copy_proc(LPVOID param)
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{
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mt_cpy_t * p = (mt_cpy_t *)param;
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while (1)
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{
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WaitForSingleObject(p->s->hCopyStartSemaphores[p->ct], INFINITE);
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memcpy(p->dest, p->src, p->size);
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ReleaseSemaphore(p->s->hCopyStopSemaphores[p->ct], 1, NULL);
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}
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return 0;
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}
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bool MTMemcpy::Initialize()
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{
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if (m_initialized)
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DeInitialize();
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for (int ctr = 0; ctr < NUM_CPY_THREADS; ctr++)
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{
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hCopyStartSemaphores[ctr] = CreateSemaphore(NULL, 0, 1, NULL);
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hCopyStopSemaphores[ctr] = CreateSemaphore(NULL, 0, 1, NULL);
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mtParamters[ctr].s = this;
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mtParamters[ctr].ct = ctr;
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hCopyThreads[ctr] = CreateThread(0, 0, thread_copy_proc, &mtParamters[ctr], 0, NULL);
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}
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m_initialized = true;
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return true;
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}
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bool MTMemcpy::Copy(void * dest, void * src, size_t bytes)
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{
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if (!m_initialized)
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return false;
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//set up parameters
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for (int ctr = 0; ctr < NUM_CPY_THREADS; ctr++)
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{
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mtParamters[ctr].dest = (char *)dest + ctr * bytes / NUM_CPY_THREADS;
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mtParamters[ctr].src = (char *)src + ctr * bytes / NUM_CPY_THREADS;
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mtParamters[ctr].size = (ctr + 1) * bytes / NUM_CPY_THREADS - ctr * bytes / NUM_CPY_THREADS;
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ReleaseSemaphore(hCopyStartSemaphores[ctr], 1, NULL);
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}
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//wait for all threads to finish
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WaitForMultipleObjects(NUM_CPY_THREADS, hCopyStopSemaphores, TRUE, INFINITE);
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return true;
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}
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void MTMemcpy::DeInitialize()
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{
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if (!m_initialized)
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return;
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for (int ctr = 0; ctr < NUM_CPY_THREADS; ctr++)
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{
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TerminateThread(hCopyThreads[ctr], 0);
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CloseHandle(hCopyStartSemaphores[ctr]);
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CloseHandle(hCopyStopSemaphores[ctr]);
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}
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m_initialized = false;
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} |