int pthread_setschedparam( pthread_t thread, int policy, struct sched_param *param ) { Thread_CPU_budget_algorithms budget_algorithm; Thread_CPU_budget_algorithm_callout budget_callout; Thread_Control *the_thread; Per_CPU_Control *cpu_self; Thread_queue_Context queue_context; int error; if ( param == NULL ) { return EINVAL; } error = _POSIX_Thread_Translate_sched_param( policy, param, &budget_algorithm, &budget_callout ); if ( error != 0 ) { return error; } _Thread_queue_Context_initialize( &queue_context ); _Thread_queue_Context_clear_priority_updates( &queue_context ); the_thread = _Thread_Get( thread, &queue_context.Lock_context.Lock_context ); if ( the_thread == NULL ) { return ESRCH; } _Thread_Wait_acquire_critical( the_thread, &queue_context ); error = _POSIX_Set_sched_param( the_thread, policy, param, budget_algorithm, budget_callout, &queue_context ); cpu_self = _Thread_queue_Dispatch_disable( &queue_context ); _Thread_Wait_release( the_thread, &queue_context ); _Thread_Priority_update( &queue_context ); _Thread_Dispatch_enable( cpu_self ); return error; }
int pthread_create( pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)( void * ), void *arg ) { const pthread_attr_t *the_attr; Priority_Control core_priority; Thread_CPU_budget_algorithms budget_algorithm; Thread_CPU_budget_algorithm_callout budget_callout; bool is_fp; bool status; Thread_Control *the_thread; POSIX_API_Control *api; int schedpolicy = SCHED_RR; struct sched_param schedparam; Objects_Name name; int rc; if ( !start_routine ) return EFAULT; the_attr = (attr) ? attr : &_POSIX_Threads_Default_attributes; if ( !the_attr->is_initialized ) return EINVAL; /* * Core Thread Initialize ensures we get the minimum amount of * stack space if it is allowed to allocate it itself. * * NOTE: If the user provides the stack we will let it drop below * twice the minimum. */ if ( the_attr->stackaddr && !_Stack_Is_enough(the_attr->stacksize) ) return EINVAL; #if 0 int cputime_clock_allowed; /* see time.h */ rtems_set_errno_and_return_minus_one( ENOSYS ); #endif /* * P1003.1c/Draft 10, p. 121. * * If inheritsched is set to PTHREAD_INHERIT_SCHED, then this thread * inherits scheduling attributes from the creating thread. If it is * PTHREAD_EXPLICIT_SCHED, then scheduling parameters come from the * attributes structure. */ switch ( the_attr->inheritsched ) { case PTHREAD_INHERIT_SCHED: api = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; schedpolicy = api->schedpolicy; schedparam = api->schedparam; break; case PTHREAD_EXPLICIT_SCHED: schedpolicy = the_attr->schedpolicy; schedparam = the_attr->schedparam; break; default: return EINVAL; } /* * Check the contentionscope since rtems only supports PROCESS wide * contention (i.e. no system wide contention). */ if ( the_attr->contentionscope != PTHREAD_SCOPE_PROCESS ) return ENOTSUP; /* * Interpret the scheduling parameters. */ if ( !_POSIX_Priority_Is_valid( schedparam.sched_priority ) ) return EINVAL; core_priority = _POSIX_Priority_To_core( schedparam.sched_priority ); /* * Set the core scheduling policy information. */ rc = _POSIX_Thread_Translate_sched_param( schedpolicy, &schedparam, &budget_algorithm, &budget_callout ); if ( rc ) return rc; /* * Currently all POSIX threads are floating point if the hardware * supports it. */ #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) is_fp = true; #else is_fp = false; #endif /* * Lock the allocator mutex for protection */ _RTEMS_Lock_allocator(); /* * Allocate the thread control block. * * NOTE: Global threads are not currently supported. */ the_thread = _POSIX_Threads_Allocate(); if ( !the_thread ) { _RTEMS_Unlock_allocator(); return EAGAIN; } /* * Initialize the core thread for this task. */ name.name_p = NULL; /* posix threads don't have a name by default */ status = _Thread_Initialize( &_POSIX_Threads_Information, the_thread, the_attr->stackaddr, _POSIX_Threads_Ensure_minimum_stack(the_attr->stacksize), is_fp, core_priority, true, /* preemptible */ budget_algorithm, budget_callout, 0, /* isr level */ name /* posix threads don't have a name */ ); if ( !status ) { _POSIX_Threads_Free( the_thread ); _RTEMS_Unlock_allocator(); return EAGAIN; } /* * finish initializing the per API structure */ api = the_thread->API_Extensions[ THREAD_API_POSIX ]; api->Attributes = *the_attr; api->detachstate = the_attr->detachstate; api->schedpolicy = schedpolicy; api->schedparam = schedparam; /* * This insures we evaluate the process-wide signals pending when we * first run. * * NOTE: Since the thread starts with all unblocked, this is necessary. */ the_thread->do_post_task_switch_extension = true; /* * POSIX threads are allocated and started in one operation. */ status = _Thread_Start( the_thread, THREAD_START_POINTER, start_routine, arg, 0 /* unused */ ); #if defined(RTEMS_DEBUG) /* * _Thread_Start only fails if the thread was in the incorrect state * * NOTE: This can only happen if someone slips in and touches the * thread while we are creating it. */ if ( !status ) { _POSIX_Threads_Free( the_thread ); _RTEMS_Unlock_allocator(); return EINVAL; } #endif if ( schedpolicy == SCHED_SPORADIC ) { _Watchdog_Insert_ticks( &api->Sporadic_timer, _Timespec_To_ticks( &api->schedparam.sched_ss_repl_period ) ); } /* * Return the id and indicate we successfully created the thread */ *thread = the_thread->Object.id; _RTEMS_Unlock_allocator(); return 0; }
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; int rc; /* * Check all the parameters */ if ( !param ) return EINVAL; rc = _POSIX_Thread_Translate_sched_param( policy, param, &budget_algorithm, &budget_callout ); if ( rc ) return rc; /* * Actually change the scheduling policy and parameters */ the_thread = _Thread_Get( thread, &location ); switch ( location ) { 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; _Watchdog_Remove( &api->Sporadic_timer ); _POSIX_Threads_Sporadic_budget_TSR( 0, the_thread ); break; } _Thread_Enable_dispatch(); return 0; #if defined(RTEMS_MULTIPROCESSING) case OBJECTS_REMOTE: #endif case OBJECTS_ERROR: break; } return ESRCH; }
int pthread_setschedparam( pthread_t thread, int policy, struct sched_param *param ) { Thread_Control *the_thread; Per_CPU_Control *cpu_self; POSIX_API_Control *api; Thread_CPU_budget_algorithms budget_algorithm; Thread_CPU_budget_algorithm_callout budget_callout; int eno; Priority_Control unused; ISR_lock_Context lock_context; Priority_Control new_priority; /* * Check all the parameters */ if ( param == NULL ) { return EINVAL; } eno = _POSIX_Thread_Translate_sched_param( policy, param, &budget_algorithm, &budget_callout ); if ( eno != 0 ) { return eno; } the_thread = _Thread_Get_interrupt_disable( thread, &lock_context ); if ( the_thread == NULL ) { return ESRCH; } /* * Actually change the scheduling policy and parameters */ cpu_self = _Thread_Dispatch_disable_critical( &lock_context ); _Thread_State_acquire_critical( the_thread, &lock_context ); api = the_thread->API_Extensions[ THREAD_API_POSIX ]; if ( api->schedpolicy == SCHED_SPORADIC ) { _Watchdog_Per_CPU_remove_relative( &api->Sporadic_timer ); } api->schedpolicy = policy; api->schedparam = *param; api->Attributes.schedpolicy = policy; api->Attributes.schedparam = *param; the_thread->budget_algorithm = budget_algorithm; the_thread->budget_callout = budget_callout; switch ( policy ) { case SCHED_OTHER: case SCHED_FIFO: case SCHED_RR: the_thread->cpu_time_budget = rtems_configuration_get_ticks_per_timeslice(); new_priority = _POSIX_Priority_To_core( api->schedparam.sched_priority ); break; case SCHED_SPORADIC: api->ss_high_priority = api->schedparam.sched_priority; break; } _Thread_State_release( the_thread, &lock_context ); switch ( policy ) { case SCHED_OTHER: case SCHED_FIFO: case SCHED_RR: _Thread_Set_priority( the_thread, new_priority, &unused, true ); break; case SCHED_SPORADIC: _POSIX_Threads_Sporadic_budget_TSR( &api->Sporadic_timer ); break; } _Thread_Dispatch_enable( cpu_self ); return 0; }