Returns information about the program object.

cl_int clGetProgramInfo ( cl_program program,
  cl_program_info param_name,
  size_t param_value_size,
  void *param_value,
  size_t *param_value_size_ret)



Specifies the program object being queried.


Specifies the information to query. The list of supported param_name types and the information returned in param_value by clGetProgramInfo is described in the table below.

cl_program_info Return Type and Info. returned in param_value

Return the program 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_PROGRAM_CONTEXT Return type: cl_context

Return the context specified when the program object is created

CL_PROGRAM_NUM_DEVICES Return type: cl_uint

Return the number of devices associated with program.

CL_PROGRAM_DEVICES Return type: cl_device_id[]

Return the list of devices associated with the program object. This can be the devices associated with context on which the program object has been created or can be a subset of devices that are specified when a progam object is created using clCreateProgramWithBinary.

CL_PROGRAM_SOURCE Return type: char[]

Return the program source code specified by clCreateProgramWithSource. The source string returned is a concatenation of all source strings specified to clCreateProgramWithSource with a null terminator. The concatenation strips any nulls in the original source strings.

The actual number of characters that represents the program source code including the null terminator is returned in param_value_size_ret.

CL_PROGRAM_BINARY_SIZES Return type: size_t[]

Returns an array that contains the size in bytes of the program binary for each device associated with program. The size of the array is the number of devices associated with program. If a binary is not available for a device(s), a size of zero is returned.

CL_PROGRAM_BINARIES Return type: unsigned char *[]

Return the program binaries for all devices associated with program. For each device in program, the binary returned can be the binary specified for the device when program is created with clCreateProgramWithBinary or it can be the executable binary generated by clBuildProgram. If program is created with clCreateProgramWithSource, the binary returned is the binary generated by clBuildProgram. The bits returned can be an implementation-specific intermediate representation (a.k.a. IR) or device specific executable bits or both. The decision on which information is returned in the binary is up to the OpenCL implementation.

param_value points to an array of n pointers allocated by the caller, where n is the number of devices associated with program. The buffer sizes needed to allocate the memory that these n pointers refer to can be queried using the CL_PROGRAM_BINARY_SIZES query as described in this table.

Each entry in this array is used by the implementation as the location in memory where to copy the program binary for a specific device, if there is a binary available. To find out which device the program binary in the array refers to, use the CL_PROGRAM_DEVICES query to get the list of devices. There is a one-to-one correspondence between the array of n pointers returned by CL_PROGRAM_BINARIES and array of devices returned by CL_PROGRAM_DEVICES.

If an entry value in the array is NULL, the implementation skips copying the program binary for the specific device identified by the array index.


A pointer to memory where the appropriate result being queried is returned. If param_value is NULL, it is ignored.


Used to specify 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.


Returns the actual size in bytes of data copied to param_value. If param_value_size_ret is NULL, it is ignored.


Returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns one of the following errors:

  • CL_INVALID_VALUE if param_name is not valid, or if size in bytes specified by param_value_size is less than the size of return type as described in the table above and param_value is not NULL.
  • CL_INVALID_PROGRAM if program is not a valid program object.
  • 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.


OpenCL Specification

Also see


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