patbalbe@disca.upv.es

P. Balbastre 2002-11-06 pthread_initcbs_np 3rtl pthread_initcbs_np Initializes a thread with SCHED_CBS_NP scheduling policy. #include <rtl_sched.h> int pthread_initcbs_np pthread_t thread hrtime_t period This function is a non-portable Real-Time Linux extension. pthread_initcbs_np initializaes a thread with SCHED_CBS_NP scheduling policy. For those threads with SCHED_CBS_NP scheduling policy the period of the thread must be defined calling this function. For periodic threads with other scheduling policies it must be used the pthread_make_periodic_np function. SCHED_CBS_NP scheduling policy efficiently handle soft real-time requests with a variable or unknown execution behaviour under SCHED_EDF_NP scheduling policy. To avoid unpredictable delays on hard real-time tasks, soft tasks are isolated through a bandwidth reservation mechanism, according to wich each soft task is assigned a deadline, computed as a function of the reserved bandwidth and its actual requests. If a thread requires to execute more than its expected computation time, its deadline is postponed so that its reserved bandwidth is not exceeded. SCHED_EDF_NP is a scheduling policy that combines both static and dynamic priority scheduling. Threads are ordered by priority, and among the same static priority threads with closer deadline first. Each thread has two scheduling attributes: priority and deadline. It is a Rate Monotonic policy and an EDF policy at each priority level. Returns zero. Parameter checking is not performed. Incorrect parameters may result in random errors. Patricia Balbastre <patricia@disca.upv.es> Pau Mendoza <pabmench@disca.upv.es> pthread_setinitbudget_np(3rtl). pthread_attr_setinitbudget_np(3rtl).