From 03598b162e66b6f3df8d9ed55ac18865c5ad2a22 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Mon, 25 Jan 1999 23:20:52 +0000 Subject: Split most of POSIX Threads Manager into multiple files. --- cpukit/posix/src/pthreadsetschedparam.c | 126 ++++++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 cpukit/posix/src/pthreadsetschedparam.c (limited to 'cpukit/posix/src/pthreadsetschedparam.c') diff --git a/cpukit/posix/src/pthreadsetschedparam.c b/cpukit/posix/src/pthreadsetschedparam.c new file mode 100644 index 0000000000..50d3bbcea3 --- /dev/null +++ b/cpukit/posix/src/pthreadsetschedparam.c @@ -0,0 +1,126 @@ +/* + * 13.5.2 Dynamic Thread Scheduling Parameters Access, + * P1003.1c/Draft 10, p. 124 + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + + +#include +#include + +#include +#include +#include +#include + +int pthread_setschedparam( + pthread_t thread, + int policy, + struct sched_param *param +) +{ + register Thread_Control *the_thread; + POSIX_API_Control *api; + Thread_CPU_budget_algorithms budget_algorithm; + Thread_CPU_budget_algorithm_callout budget_callout; + Objects_Locations location; + + /* + * Check all the parameters + */ + + if ( !param ) + return EINVAL; + + if ( !_POSIX_Priority_Is_valid( param->sched_priority ) ) + return EINVAL; + + budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE; + budget_callout = NULL; + + switch ( policy ) { + case SCHED_OTHER: + budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE; + break; + + case SCHED_FIFO: + budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE; + break; + + case SCHED_RR: + budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE; + break; + + case SCHED_SPORADIC: + budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_CALLOUT; + budget_callout = _POSIX_Threads_Sporadic_budget_callout; + + if ( _POSIX_Timespec_to_interval( ¶m->ss_replenish_period ) < + _POSIX_Timespec_to_interval( ¶m->ss_initial_budget ) ) + return EINVAL; + + if ( !_POSIX_Priority_Is_valid( param->ss_low_priority ) ) + return EINVAL; + + break; + + default: + return EINVAL; + } + + /* + * Actually change the scheduling policy and parameters + */ + + the_thread = _POSIX_Threads_Get( thread, &location ); + switch ( location ) { + case OBJECTS_ERROR: + case OBJECTS_REMOTE: + return ESRCH; + case OBJECTS_LOCAL: + api = the_thread->API_Extensions[ THREAD_API_POSIX ]; + + if ( api->schedpolicy == SCHED_SPORADIC ) + (void) _Watchdog_Remove( &api->Sporadic_timer ); + + api->schedpolicy = policy; + api->schedparam = *param; + the_thread->budget_algorithm = budget_algorithm; + the_thread->budget_callout = budget_callout; + + switch ( api->schedpolicy ) { + case SCHED_OTHER: + case SCHED_FIFO: + case SCHED_RR: + the_thread->cpu_time_budget = _Thread_Ticks_per_timeslice; + + the_thread->real_priority = + _POSIX_Priority_To_core( api->schedparam.sched_priority ); + + _Thread_Change_priority( + the_thread, + the_thread->real_priority, + TRUE + ); + break; + + case SCHED_SPORADIC: + api->ss_high_priority = api->schedparam.sched_priority; + _POSIX_Threads_Sporadic_budget_TSR( 0, the_thread ); + break; + } + + _Thread_Enable_dispatch(); + return 0; + } + return POSIX_BOTTOM_REACHED(); +} -- cgit v1.2.3