table of contents
CLGETCONTEXTINFO(3clc) | OpenCL Manual | CLGETCONTEXTINFO(3clc) |
NAME¶
clGetContextInfo - Query information about a context.¶
cl_int clGetContextInfo(cl_context context, cl_context_info param_name, size_t param_value_size, void *param_value, size_t *param_value_size_ret);
PARAMETERS¶
contextSpecifies the OpenCL context being queried.
param_name
An enumeration constant that specifies the information to
query. The valid values for param_name are:
cl_context_info | Return Type | Information returned in param_value |
CL_CONTEXT_REFERENCE_COUNT | cl_uint | Return the context reference count. The reference count returned should be considered immediately stale. It is unsuitable for general use in applications. This feature is provided for identifying memory leaks. |
CL_CONTEXT_NUM_DEVICES | cl_uint | Return the number of devices in context. |
CL_CONTEXT_DEVICES | cl_device_id[] | Return the list of devices in context. |
CL_CONTEXT_PROPERTIES | cl_context_- properties[] | Return the properties argument specified in clCreateContext(3clc) or clCreateContextFromType(3clc). If the properties argument specified in clCreateContext(3clc) or clCreateContextFromType(3clc) used to create context is not NULL, the implementation must return the values specified in the properties argument. properties argument specified in clCreateContext(3clc) or clCreateContextFromType(3clc) used to create context is NULL, the implementation may return either a param_value_size_ret of 0, i.e. there is no context property value to be returned or can return a context property value of 0 (where 0 is used to terminate the context properties list) in the memory that param_value points to. |
CL_CONTEXT_D3D10_PREFER_- SHARED_RESOURCES_KHR | cl_bool | If the cl_khr_d3d10_sharing(3clc) extension is enabled, returns CL_TRUE if Direct3D 10 resources created as shared by setting MiscFlags to include D3D10_RESOURCE_MISC_SHARED will perform faster when shared with OpenCL, compared with resources which have not set this flag. Otherwise returns CL_FALSE. |
CL_CONTEXT_D3D11_PREFER_- SHARED_RESOURCES_KHR | cl_bool | If the cl_khr_d3d11_sharing extension is supported, Returns CL_TRUE if Direct3D 11 resources created as shared by setting MiscFlags to include D3D11_RESOURCE_MISC_SHARED will perform faster when shared with OpenCL, compared with resources which have not set this flag. Otherwise returns CL_FALSE. |
param_value
A pointer to memory where the appropriate result being
queried is returned. If param_value is NULL, it is ignored.
param_value_size
Specifies the size in bytes of memory pointed to by
param_value. This size must be greater than or equal to the size of
return type as described in the table above.
param_value_size_ret
Returns the actual size in bytes of data being queried by
param_value. If param_value_size_ret is NULL, it is
ignored.
ERRORS¶
Returns CL_SUCCESS if the function executed successfully, or one of the errors below:•CL_INVALID_CONTEXT if context is not a
valid context.
•CL_INVALID_VALUE if param_name is not one
of the supported values or if size in bytes specified by
param_value_size is < size of return type as specified in the table
above and param_value is not a NULL value.
•CL_OUT_OF_RESOURCES if there is a failure to
allocate resources required by the OpenCL implementation on the device.
•CL_OUT_OF_HOST_MEMORY if there is a failure to
allocate resources required by the OpenCL implementation on the host.
SPECIFICATION¶
OpenCL Specification[1]SEE ALSO¶
clGetDeviceInfo(3clc)AUTHORS¶
The Khronos GroupCOPYRIGHT¶
Copyright © 2007-2011 The Khronos Group Inc.Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or associated documentation files (the "Materials"), to deal in the Materials without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to the condition that this copyright notice and permission notice shall be included in all copies or substantial portions of the Materials.
NOTES¶
- 1.
- OpenCL Specification
page 58, section 4.4 - Contexts
06/18/2014 | The Khronos Group |