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

context

Specifies 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_DEVICES`	cl_device_id[]	Return the list of devices in `context`.
`CL_CONTEXT_PROPERTIES`	cl_context_properties[]	Return the properties argument specified in clCreateContext.

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 less than size of return type as specified in the table above and param_value is not a NULL value.

Specification

OpenCL Specification

Also see

clGetDeviceInfo

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