Currently, no browsers natively support WebCL. However, non-native add-ons are used to implement WebCL. For example, Nokia developed a WebCL extension. Mozilla does not plan to implement WebCL in favor of OpenGL ES 3.1 Compute Shaders.
The basic unit of a parallel program is kernel. A kernel is any parallelizable task used to perform a specific job. More often functions can be realized as kernels. A program can be composed of one or more kernels. In order to realize a kernel, it is essential that a task is parallelizable. Data dependencies and order of execution play a vital role in producing efficient parallelized algorithms. A simple example can be thought of the case of loop unrolling performed by C compilers, where a statement like:
can be unrolled into:
Above statements can be parallelized and can be made to run simultaneously. A kernel follows a similar approach where only the snapshot of the ith iteration is captured inside kernel.
Let’s rewrite the above code using a kernel:
Running a WebCL application involves the following steps:
Further details about the same can be found at
From the code above, it can be observed that the message field can be a NULL value.
List of few other exceptions:
More information on exceptions can be found in the specs document.
There is another exception that is raised upon trying to call an object that is ‘released’. On using the release method, the object doesn’t get deleted permanently but it frees the resources associated with that object. In order to avoid this exception, ‘releaseAll’ method can be used, which not only frees the resources but also deletes all the associated objects created.
WebCL, being an open-ended software developed for web applications, there is lot of scope for vulnerabilities in the design and development fields too. This forced the developers working on WebCL to give security the utmost importance. Few concerns that were addressed are: