[英]clCreateContextFromType ends up in a SEGFAULT while execution
I am trying to create an OpenCL context on the platform which is containing my graphics card. 我正在尝试在包含我的图形卡的平台上创建OpenCL上下文。 But when I call
clCreateContextFromType()
a SEGFAULT is thrown. 但是,当我调用
clCreateContextFromType()
将引发SEGFAULT。
int main(int argc, char** argv)
{
/*
...
*/
cl_platform_id* someValidPlatformId;
//creating heap space using malloc to store all platform ids
getCLPlatforms(someValidPlatformId);
//error handling for getCLPLatforms()
//OCLPlatform(cl_platform_id platform)
OCLPLatform platform = OCLPlatform(someValidPlatformId[0]);
//OCLContext::OCL_GPU_DEVICE == CL_DEVICE_TYPE_GPU
OCLContext context = OCLContext(platform,OCLContext::OCL_GPU_DEVICE);
/*
...
*/
}
cl_platform_id* getCLPlatforms(cl_platform_id* platforms)
{
cl_int errNum;
cl_uint numPlatforms;
numPlatforms = (cl_uint) getCLPlatformsCount(); //returns the platform count
//using clGetPlatformIDs()
//as described in the Khronos API
if(numPlatforms == 0)
return NULL;
errNum = clGetPlatformIDs(numPlatforms,platforms,NULL);
if(errNum != CL_SUCCESS)
return NULL;
return platforms;
}
OCLContext::OCLContext(OCLPlatform platform,unsigned int type)
{
this->initialize(platform,type);
}
void OCLContext::initialize(OCLPlatform platform,unsigned int type)
{
cl_int errNum;
cl_context_properties contextProperties[] =
{
CL_CONTEXT_PLATFORM,
(cl_context_properties)platform.getPlatformId(),
0
};
cout << "a" << endl;std::flush(cout);
this->context = clCreateContextFromType(contextProperties,
(cl_device_type)type,
&pfn_notify,
NULL,&errNum);
if(errNum != CL_SUCCESS)
throw OCLContextException();
cout << "b" << endl;std::flush(cout);
/*
...
*/
}
The given type
is CL_DEVICE_TYPE_GPU and also the platform contained by the cl_context_properties
array is valid. 给定的
type
为CL_DEVICE_TYPE_GPU, cl_context_properties
数组包含的平台也有效。
To debug the error I implemented the following pfn_notify()
function described by the Khronos API: 为了调试错误,我实现了Khronos API描述的以下
pfn_notify()
函数:
static void pfn_notify(const char* errinfo,
const void* private_info,
size_t cb, void* user_data)
{
fprintf(stderr, "OpenCL Error (via pfn_notify): %s\n", errinfo);
flush(cout);
}
Here is the ouput schown by the shell: 这是外壳发出的输出:
$ ./OpenCLFramework.exe
a
Segmentation fault
The machine i am working with has the following properties: 我正在使用的机器具有以下属性:
It would be great if somebody knew an answer to this problem. 如果有人知道这个问题的答案,那就太好了。
The problem seems to be solved now. 该问题现在似乎已解决。
Injecting the a valid cl_platform_id
throught gdb solved the SEGFAULT. 通过gdb注入有效的
cl_platform_id
解决SEGFAULT。 So I digged a little bit deeper and the issue for the error was that I saved the value as a standard primitive. 因此,我进行了更深入的研究,错误的原因是我将该值保存为标准原语。 When I called a function with this value casted to
cl_platform_id
some functions failed handling that. 当我使用将此值
cl_platform_id
转换为cl_platform_id
函数cl_platform_id
某些函数无法对其进行处理。 So it looks like it is a mingling of types what lead to this failure. 因此,导致失败的原因似乎是类型的混合。
Now I save the value as cl_platform_id
and cast it to an primitive when needed and not vice versa. 现在,我将值另存为
cl_platform_id
并在需要时将其cl_platform_id
转换为基元,反之亦然。
I thank you for your answers and apologize for the long radio silence for my part. 我感谢您的回答,并为电台长时间的沉默表示歉意。
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