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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [threadtickletimeslice.c] - Rev 227
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/* * Thread Handler * * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: threadtickletimeslice.c,v 1.2 2001-09-27 11:59:34 chris Exp $ */ #include <rtems/system.h> #include <rtems/score/apiext.h> #include <rtems/score/context.h> #include <rtems/score/interr.h> #include <rtems/score/isr.h> #include <rtems/score/object.h> #include <rtems/score/priority.h> #include <rtems/score/states.h> #include <rtems/score/sysstate.h> #include <rtems/score/thread.h> #include <rtems/score/threadq.h> #include <rtems/score/userext.h> #include <rtems/score/wkspace.h> /*PAGE * * _Thread_Tickle_timeslice * * This scheduler routine determines if timeslicing is enabled * for the currently executing thread and, if so, updates the * timeslice count and checks for timeslice expiration. * * Input parameters: NONE * * Output parameters: NONE */ void _Thread_Tickle_timeslice( void ) { Thread_Control *executing; executing = _Thread_Executing; /* * Increment the number of ticks this thread has been executing */ executing->ticks_executed++; /* * If the thread is not preemptible or is not ready, then * just return. */ if ( !executing->is_preemptible ) return; if ( !_States_Is_ready( executing->current_state ) ) return; /* * The cpu budget algorithm determines what happens next. */ switch ( executing->budget_algorithm ) { case THREAD_CPU_BUDGET_ALGORITHM_NONE: break; case THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE: case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE: if ( --executing->cpu_time_budget == 0 ) { _Thread_Reset_timeslice(); executing->cpu_time_budget = _Thread_Ticks_per_timeslice; } break; case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT: if ( --executing->cpu_time_budget == 0 ) (*executing->budget_callout)( executing ); break; } }
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