forked from Imagelibrary/rtems
f39f667a69
The function to change a thread priority was too complex. Simplify it with a new scheduler operation. This increases the average case performance due to the simplified logic. The interrupt disabled critical section is a bit prolonged since now the extract, update and enqueue steps are executed atomically. This should however not impact the worst-case interrupt latency since at least for the Deterministic Priority Scheduler this sequence can be carried out with a wee bit of instructions and no loops. Add _Scheduler_Change_priority() to replace the sequence of - _Thread_Set_transient(), - _Scheduler_Extract(), - _Scheduler_Enqueue(), and - _Scheduler_Enqueue_first(). Delete STATES_TRANSIENT, _States_Is_transient() and _Thread_Set_transient() since this state is now superfluous. With this change it is possible to get rid of the SCHEDULER_SMP_NODE_IN_THE_AIR state. This considerably simplifies the implementation of the new SMP locking protocols.
This directory contains for the "miscellaneous" library. Currently this library contains a number of useful support libraries: + Task Stack Overflow Checker + Workspace Consistency Checker + Task Execution Time Monitor + Period Statistics Monitor + Debug Monitor The following ideas have been mentioned for items which could go in this library, but this list is not all inclusive: + there are no outstanding suggestions. The intent of this library is to provide a home for useful utility routines which are dependent upon RTEMS. --joel 16 Sept 97