METHOD FOR EXECUTING REAL TIME TASK IN MOBILE TERMINAL

摘要

PURPOSE: A method for executing a real time task in a mobile terminal is provided to execute a real time task normally. CONSTITUTION: If a multimedia task execution request is detected(101), a CPU confirms whether simultaneous execution for a real time task and a non-real time task is required(103). In case that simultaneous execution for a real time task and a non-real time task is required, the CPU searches for an ISR(Interrupt Service Routine) necessary to execute the requested multimedia task(107). The CPU divides the searched ISR into a real time ISR and a non-real time ISR(109). The CPU calculates the execution time of the divided non-real time ISR(111). The CPU calculates the interrupt generation time interval of the divided real time ISR(113). The CPU compares the execution time of the non-real time ISR with the interrupt generation time interval of the real time ISR(115). If the execution time of the non-real time ISR is longer than the interrupt generation time interval of the real time ISR, the CPU allocates an FIQ(Fast Interrupt reQuest) to the real time ISR so that a real time task can be executed normally. Also the CPU allocates an IRQ(Interrupt Request) to the non-real time ISR(117). The CPU executes an associated ISR according to interrupt request generation(121).