Abstract: An apparatus and method of grouping tasks for execution by a processor, such as a digital signal processor. At least one task datum, is created the task datum including an identifier of a first task, and a reference to a next task datum. The task datum is placed into a task list which may contain references to any number of tasks. A reference is created to a first module datum in the task datum, the first module datum representing a first executable module of the first task. The first module datum is linked with any number of modules having functions related to the first executable module. By grouping the related modules which form a task together, error conditions, and data for each of the tasks and modules may be handled more efficiently. Modules may reference common storage areas they require so that unnecessary loading/saving of data in those common storage areas may be avoided.

Abstract: In a computer system having a digital signal processor for processing a number of tasks within a frame, a method for handling a frame overrun wherein the tasks cannot be processed within the frame. First, the frame overrun is detected. Next, each of the tasks are compared with a processing time which had been allocated to it. A determination is made as to which of these tasks had exceeded its allotted processing time by the greatest amount. The worst case client is notified that its task has caused an overrun. All other non-system task clients are notified that a overrun has occurred. All but system support tasks are inactivated, and processing continues. Each client must determine the correct action to take, including restarting the tasks where they left off, restarting from the beginning, or quitting. Methods for handling more serious overruns are also described.

Abstract: A method and apparatus for providing multiple clients simultaneous access to a sound input/output (I/O) data stream. The present invention provides a method and apparatus for providing multiple programming data structures and multiple patch points in a list, in which each of the patch points are positioned relative to at least one of the programming data structures and is capable of receiving at least one programming data structure for insertion into the list to perform a function. The present invention also includes a method and apparatus for providing at least one buffer for inputting the data stream into and/or receiving the data stream output from each of inserted programming structures, such that each inserted structure can access and operate on the data stream. In this way, multiple clients can access and process the data stream transparently, without interfering with the operation of other clients, yet affecting the sound stream in the desired way.