Abstract: A data transmission method applicable to a network data processing device and adapted to execute data transmission between transmission protocol layers of a network system includes creating in a driver a global pointer series-connected to information about a pending task, and creating a status variable indicating a current execution status of the pending task; setting quantity of threads and tasks to be executed; series-connecting the global pointer to information about a new task and awakening the waiting thread as soon as the new task is received by the driver; searching the global pointer from the beginning so as to identify and execute the executable tasks, switching the thread to the next executable task for execution upon completion of execution of one step of each of the executable tasks, allowing the thread to return to the waiting state upon completion of execution of the set quantity of the executable tasks.

Abstract: A data access method for use in a system driver of a computer system using direct memory access (DMA) for data transmission between the system driver, a device in the computer system, and random access memory (RAM) includes the steps of requesting the computer system for a predetermined number of logic memory blocks and corresponding DMA memory blocks during initialization of the system driver to form a predetermined number of storage units, loading data structures of the storage units with pointers of the logic memory blocks and corresponding DMA memory blocks, and creating a global pointer pointing to a data table stored with usage statuses of the storage units. Accordingly, the system driver transmits data by the storage units directly without having to wait for responses from the computer system, thus enabling the system driver to perform data access fast.