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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of the copyright holders may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
#include "precomp.hpp"
#if !defined(HAVE_CUDA)
namespace cv { namespace gpu {
class MultiGpuManager::Impl {};
MultiGpuManager::MultiGpuManager() { throw_nogpu(); }
MultiGpuManager::~MultiGpuManager() {}
void MultiGpuManager::init() { throw_nogpu(); }
void MultiGpuManager::gpuOn(int) { throw_nogpu(); }
void MultiGpuManager::gpuOff() { throw_nogpu(); }
}}
#else
#include <vector>
#include <cuda.h>
#define cuSafeCall(expr) safeCall(expr, #expr, __FILE__, __LINE__)
using namespace std;
namespace cv { namespace gpu {
class MultiGpuManager::Impl
{
public:
Impl();
~Impl()
{
for (int i = 0; i < num_devices_; ++i)
cuSafeCall(cuCtxDestroy(contexts_[i]));
}
void gpuOn(int gpu_id)
{
if (gpu_id < 0 || gpu_id >= num_devices_)
CV_Error(CV_StsBadArg, "MultiGpuManager::gpuOn: GPU ID is out of range");
cuSafeCall(cuCtxPushCurrent(contexts_[gpu_id]));
}
void gpuOff()
{
CUcontext prev_context;
cuSafeCall(cuCtxPopCurrent(&prev_context));
}
private:
void safeCall(CUresult code, const char* expr, const char* file, int line)
{
if (code != CUDA_SUCCESS)
error(expr, file, line, "");
}
int num_devices_;
vector<CUcontext> contexts_;
};
MultiGpuManager::Impl::Impl(): num_devices_(0)
{
num_devices_ = getCudaEnabledDeviceCount();
contexts_.resize(num_devices_);
cuSafeCall(cuInit(0));
CUdevice device;
CUcontext prev_context;
for (int i = 0; i < num_devices_; ++i)
{
cuSafeCall(cuDeviceGet(&device, i));
cuSafeCall(cuCtxCreate(&contexts_[i], 0, device));
cuSafeCall(cuCtxPopCurrent(&prev_context));
}
}
MultiGpuManager::MultiGpuManager() {}
MultiGpuManager::~MultiGpuManager() {}
void MultiGpuManager::init()
{
impl_ = Ptr<Impl>(new Impl());
}
void MultiGpuManager::gpuOn(int gpu_id)
{
if (impl_.empty())
CV_Error(CV_StsNullPtr, "MultiGpuManager::gpuOn: must be initialized before any calls");
impl_->gpuOn(gpu_id);
}
void MultiGpuManager::gpuOff()
{
if (impl_.empty())
CV_Error(CV_StsNullPtr, "MultiGpuManager::gpuOff: must be initialized before any calls");
impl_->gpuOff();
}
}}
#endif