## C Specification

To retain a context, call the function:

cl_int clRetainContext(
cl_context context);

## Parameters

• context specifies the OpenCL context to retain.

## Description

clRetainContext increments the context reference count.

clCreateContext and clCreateContextFromType perform an implicit retain. This is very helpful for 3rd party libraries, which typically get a context passed to them by the application. However, it is possible that the application may delete the context without informing the library. Allowing functions to attach to (i.e. retain) and release a context solves the problem of a context being used by a library no longer being valid.

clRetainContext returns CL_​SUCCESS if the function is executed successfully. Otherwise, it returns one of the following errors:

• CL_​INVALID_​CONTEXT if context is not a valid OpenCL context.

• 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.