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Diffstat (limited to 'cpukit/score/src/thread.c')
-rw-r--r-- | cpukit/score/src/thread.c | 1171 |
1 files changed, 0 insertions, 1171 deletions
diff --git a/cpukit/score/src/thread.c b/cpukit/score/src/thread.c deleted file mode 100644 index 79fa859cbe..0000000000 --- a/cpukit/score/src/thread.c +++ /dev/null @@ -1,1171 +0,0 @@ -/* - * Thread Handler - * - * - * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. - * On-Line Applications Research Corporation (OAR). - * All rights assigned to U.S. Government, 1994. - * - * This material may be reproduced by or for the U.S. Government pursuant - * to the copyright license under the clause at DFARS 252.227-7013. This - * notice must appear in all copies of this file and its derivatives. - * - * $Id$ - */ - -#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_Handler_initialization - * - * This routine initializes all thread manager related data structures. - * - * Input parameters: - * ticks_per_timeslice - clock ticks per quantum - * maximum_proxies - number of proxies to initialize - * - * Output parameters: NONE - */ - -char *_Thread_Idle_name = "IDLE"; - -void _Thread_Handler_initialization( - unsigned32 ticks_per_timeslice, - unsigned32 maximum_extensions, - unsigned32 maximum_proxies -) -{ - unsigned32 index; - - _Context_Switch_necessary = FALSE; - _Thread_Executing = NULL; - _Thread_Heir = NULL; - _Thread_Allocated_fp = NULL; - - _Thread_Maximum_extensions = maximum_extensions; - - _Thread_Ticks_remaining_in_timeslice = ticks_per_timeslice; - _Thread_Ticks_per_timeslice = ticks_per_timeslice; - - _Thread_Ready_chain = _Workspace_Allocate_or_fatal_error( - (PRIORITY_MAXIMUM + 1) * sizeof(Chain_Control) - ); - - for ( index=0; index <= PRIORITY_MAXIMUM ; index++ ) - _Chain_Initialize_empty( &_Thread_Ready_chain[ index ] ); - - _Thread_MP_Handler_initialization( maximum_proxies ); - - /* - * Initialize this class of objects. - */ - - _Objects_Initialize_information( - &_Thread_Internal_information, - OBJECTS_INTERNAL_THREADS, - FALSE, - ( _System_state_Is_multiprocessing ) ? 2 : 1, - sizeof( Thread_Control ), - TRUE, - 8, - TRUE - ); - -} - -/*PAGE - * - * _Thread_Create_idle - */ - -void _Thread_Create_idle( void ) -{ - void *idle; - - /* - * The entire workspace is zeroed during its initialization. Thus, all - * fields not explicitly assigned were explicitly zeroed by - * _Workspace_Initialization. - */ - - _Thread_Idle = _Thread_Internal_allocate(); - - /* - * Initialize the IDLE task. - */ - -#if (CPU_PROVIDES_IDLE_THREAD_BODY == TRUE) - idle = _CPU_Thread_Idle_body; -#else - idle = _Thread_Idle_body; -#endif - - if ( _CPU_Table.idle_task ) - idle = _CPU_Table.idle_task; - - _Thread_Initialize( - &_Thread_Internal_information, - _Thread_Idle, - NULL, /* allocate the stack */ - THREAD_IDLE_STACK_SIZE, - CPU_IDLE_TASK_IS_FP, - PRIORITY_MAXIMUM, - TRUE, /* preemptable */ - FALSE, /* not timesliced */ - 0, /* all interrupts enabled */ - _Thread_Idle_name - ); - - /* - * WARNING!!! This is necessary to "kick" start the system and - * MUST be done before _Thread_Start is invoked. - */ - - _Thread_Heir = - _Thread_Executing = _Thread_Idle; - - _Thread_Start( - _Thread_Idle, - THREAD_START_NUMERIC, - idle, - NULL, - 0 - ); - -} - -/*PAGE - * - * _Thread_Start_multitasking - * - * This kernel routine readies the requested thread, the thread chain - * is adjusted. A new heir thread may be selected. - * - * Input parameters: - * system_thread - pointer to system initialization thread control block - * idle_thread - pointer to idle thread control block - * - * Output parameters: NONE - * - * NOTE: This routine uses the "blocking" heir selection mechanism. - * This insures the correct heir after a thread restart. - * - * INTERRUPT LATENCY: - * ready chain - * select heir - */ - -void _Thread_Start_multitasking( void ) -{ - /* - * The system is now multitasking and completely initialized. - * This system thread now either "goes away" in a single processor - * system or "turns into" the server thread in an MP system. - */ - - _System_state_Set( SYSTEM_STATE_UP ); - - _Context_Switch_necessary = FALSE; - - _Thread_Executing = _Thread_Heir; - - _Context_Switch( &_Thread_BSP_context, &_Thread_Executing->Registers ); -} - -/*PAGE - * - * _Thread_Dispatch - * - * This kernel routine determines if a dispatch is needed, and if so - * dispatches to the heir thread. Once the heir is running an attempt - * is made to dispatch any ASRs. - * - * ALTERNATE ENTRY POINTS: - * void _Thread_Enable_dispatch(); - * - * Input parameters: NONE - * - * Output parameters: NONE - * - * INTERRUPT LATENCY: - * dispatch thread - * no dispatch thread - */ - -#if ( CPU_INLINE_ENABLE_DISPATCH == FALSE ) -void _Thread_Enable_dispatch( void ) -{ - if ( --_Thread_Dispatch_disable_level ) - return; - _Thread_Dispatch(); -} -#endif - -void _Thread_Dispatch( void ) -{ - Thread_Control *executing; - Thread_Control *heir; - ISR_Level level; - - executing = _Thread_Executing; - _ISR_Disable( level ); - while ( _Context_Switch_necessary == TRUE ) { - heir = _Thread_Heir; - _Thread_Dispatch_disable_level = 1; - _Context_Switch_necessary = FALSE; - _Thread_Executing = heir; - _ISR_Enable( level ); - - _User_extensions_Thread_switch( executing, heir ); - - _Thread_Ticks_remaining_in_timeslice = _Thread_Ticks_per_timeslice; - - /* - * If the CPU has hardware floating point, then we must address saving - * and restoring it as part of the context switch. - * - * The second conditional compilation section selects the algorithm used - * to context switch between floating point tasks. The deferred algorithm - * can be significantly better in a system with few floating point tasks - * because it reduces the total number of save and restore FP context - * operations. However, this algorithm can not be used on all CPUs due - * to unpredictable use of FP registers by some compilers for integer - * operations. - */ - -#if ( CPU_HARDWARE_FP == TRUE ) -#if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) - if ( (heir->fp_context != NULL) && !_Thread_Is_allocated_fp( heir ) ) { - if ( _Thread_Allocated_fp != NULL ) - _Context_Save_fp( &_Thread_Allocated_fp->fp_context ); - _Context_Restore_fp( &heir->fp_context ); - _Thread_Allocated_fp = heir; - } -#else - if ( executing->fp_context != NULL ) - _Context_Save_fp( &executing->fp_context ); - - if ( heir->fp_context != NULL ) - _Context_Restore_fp( &heir->fp_context ); -#endif -#endif - - _Context_Switch( &executing->Registers, &heir->Registers ); - - executing = _Thread_Executing; - - _ISR_Disable( level ); - } - - _Thread_Dispatch_disable_level = 0; - - _ISR_Enable( level ); - - if ( executing->do_post_task_switch_extension ) { - executing->do_post_task_switch_extension = FALSE; - _API_extensions_Run_postswitch(); - } - -} - -/*PAGE - * - * _Thread_Initialize - * - * XXX - */ - -boolean _Thread_Initialize( - Objects_Information *information, - Thread_Control *the_thread, - void *stack_area, /* NULL if to be allocated */ - unsigned32 stack_size, /* insure it is >= min */ - boolean is_fp, /* TRUE if thread uses FP */ - Priority_Control priority, - boolean is_preemptible, - boolean is_timeslice, - unsigned32 isr_level, - Objects_Name name - -) -{ - unsigned32 actual_stack_size; - void *stack; - void *fp_area; - void *extensions_area; - - /* - * Allocate and Initialize the stack for this thread. - */ - - if ( !_Stack_Is_enough( stack_size ) ) - actual_stack_size = STACK_MINIMUM_SIZE; - else - actual_stack_size = stack_size; - - actual_stack_size = _Stack_Adjust_size( actual_stack_size ); - stack = stack_area; - - if ( !stack ) { - stack = _Workspace_Allocate( actual_stack_size ); - - if ( !stack ) - return FALSE; - - the_thread->Start.stack = stack; - } else - the_thread->Start.stack = NULL; - - _Stack_Initialize( - &the_thread->Start.Initial_stack, - stack, - actual_stack_size - ); - - /* - * Allocate the floating point area for this thread - */ - - if ( is_fp ) { - - fp_area = _Workspace_Allocate( CONTEXT_FP_SIZE ); - if ( !fp_area ) { - if ( the_thread->Start.stack ) - (void) _Workspace_Free( the_thread->Start.stack ); - return FALSE; - } - fp_area = _Context_Fp_start( fp_area, 0 ); - - } else - fp_area = NULL; - - the_thread->fp_context = fp_area; - the_thread->Start.fp_context = fp_area; - - - /* - * Allocate the floating point area for this thread - */ - - if ( _Thread_Maximum_extensions ) { - extensions_area = _Workspace_Allocate( - (_Thread_Maximum_extensions + 1) * sizeof( void * ) - ); - - if ( !extensions_area ) { - if ( fp_area ) - (void) _Workspace_Free( fp_area ); - - if ( the_thread->Start.stack ) - (void) _Workspace_Free( the_thread->Start.stack ); - - return FALSE; - } - } else - extensions_area = NULL; - - the_thread->extensions = extensions_area; - - /* - * General initialization - */ - - the_thread->Start.is_preemptible = is_preemptible; - the_thread->Start.is_timeslice = is_timeslice; - the_thread->Start.isr_level = isr_level; - - the_thread->current_state = STATES_DORMANT; - the_thread->resource_count = 0; - the_thread->real_priority = priority; - the_thread->Start.initial_priority = priority; - - _Thread_Set_priority( the_thread, priority ); - - /* - * Open the object - */ - - _Objects_Open( information, &the_thread->Object, name ); - - /* - * Invoke create extensions - */ - - if ( !_User_extensions_Thread_create( the_thread ) ) { - - if ( extensions_area ) - (void) _Workspace_Free( extensions_area ); - - if ( fp_area ) - (void) _Workspace_Free( fp_area ); - - if ( the_thread->Start.stack ) - (void) _Workspace_Free( the_thread->Start.stack ); - - return FALSE; - } - - return TRUE; - -} - -/* - * _Thread_Start - * - * DESCRIPTION: - * - * XXX - */ - -boolean _Thread_Start( - Thread_Control *the_thread, - Thread_Start_types the_prototype, - void *entry_point, - void *pointer_argument, - unsigned32 numeric_argument -) -{ - if ( _States_Is_dormant( the_thread->current_state ) ) { - - the_thread->Start.entry_point = entry_point; - - the_thread->Start.prototype = the_prototype; - the_thread->Start.pointer_argument = pointer_argument; - the_thread->Start.numeric_argument = numeric_argument; - - _Thread_Load_environment( the_thread ); - - _Thread_Ready( the_thread ); - - _User_extensions_Thread_start( the_thread ); - - return TRUE; - } - - return FALSE; - -} - -/* - * _Thread_Restart - * - * DESCRIPTION: - * - * XXX - */ - -boolean _Thread_Restart( - Thread_Control *the_thread, - void *pointer_argument, - unsigned32 numeric_argument -) -{ - if ( !_States_Is_dormant( the_thread->current_state ) ) { - - _Thread_Set_transient( the_thread ); - the_thread->resource_count = 0; - the_thread->is_preemptible = the_thread->Start.is_preemptible; - the_thread->is_timeslice = the_thread->Start.is_timeslice; - - the_thread->Start.pointer_argument = pointer_argument; - the_thread->Start.numeric_argument = numeric_argument; - - if ( !_Thread_queue_Extract_with_proxy( the_thread ) ) { - - if ( _Watchdog_Is_active( &the_thread->Timer ) ) - (void) _Watchdog_Remove( &the_thread->Timer ); - } - - if ( the_thread->current_priority != the_thread->Start.initial_priority ) { - the_thread->real_priority = the_thread->Start.initial_priority; - _Thread_Set_priority( the_thread, the_thread->Start.initial_priority ); - } - - _Thread_Load_environment( the_thread ); - - _Thread_Ready( the_thread ); - - _User_extensions_Thread_restart( the_thread ); - - if ( _Thread_Is_executing ( the_thread ) ) - _Thread_Restart_self(); - - return TRUE; - } - - return FALSE; -} - -/* - * _Thread_Close - * - * DESCRIPTION: - * - * XXX - */ - -void _Thread_Close( - Objects_Information *information, - Thread_Control *the_thread -) -{ - _Objects_Close( information, &the_thread->Object ); - - _Thread_Set_state( the_thread, STATES_TRANSIENT ); - - if ( !_Thread_queue_Extract_with_proxy( the_thread ) ) { - - if ( _Watchdog_Is_active( &the_thread->Timer ) ) - (void) _Watchdog_Remove( &the_thread->Timer ); - } - - _User_extensions_Thread_delete( the_thread ); - -#if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) - if ( _Thread_Is_allocated_fp( the_thread ) ) - _Thread_Deallocate_fp(); -#endif - the_thread->fp_context = NULL; - - if ( the_thread->Start.fp_context ) - (void) _Workspace_Free( the_thread->Start.fp_context ); - - if ( the_thread->Start.stack ) - (void) _Workspace_Free( the_thread->Start.stack ); - - if ( the_thread->extensions ) - (void) _Workspace_Free( the_thread->extensions ); - - the_thread->Start.stack = NULL; - the_thread->extensions = NULL; -} - -/*PAGE - * - * _Thread_Ready - * - * This kernel routine readies the requested thread, the thread chain - * is adjusted. A new heir thread may be selected. - * - * Input parameters: - * the_thread - pointer to thread control block - * - * Output parameters: NONE - * - * NOTE: This routine uses the "blocking" heir selection mechanism. - * This insures the correct heir after a thread restart. - * - * INTERRUPT LATENCY: - * ready chain - * select heir - */ - -void _Thread_Ready( - Thread_Control *the_thread -) -{ - ISR_Level level; - Thread_Control *heir; - - _ISR_Disable( level ); - - the_thread->current_state = STATES_READY; - - _Priority_Add_to_bit_map( &the_thread->Priority_map ); - - _Chain_Append_unprotected( the_thread->ready, &the_thread->Object.Node ); - - _ISR_Flash( level ); - - _Thread_Calculate_heir(); - - heir = _Thread_Heir; - - if ( !_Thread_Is_executing( heir ) && _Thread_Executing->is_preemptible ) - _Context_Switch_necessary = TRUE; - - _ISR_Enable( level ); -} - -/*PAGE - * - * _Thread_Clear_state - * - * This kernel routine clears the appropriate states in the - * requested thread. The thread ready chain is adjusted if - * necessary and the Heir thread is set accordingly. - * - * Input parameters: - * the_thread - pointer to thread control block - * state - state set to clear - * - * Output parameters: NONE - * - * INTERRUPT LATENCY: - * priority map - * select heir - */ - -void _Thread_Clear_state( - Thread_Control *the_thread, - States_Control state -) -{ - ISR_Level level; - - _ISR_Disable( level ); - the_thread->current_state = - _States_Clear( state, the_thread->current_state ); - - if ( _States_Is_ready( the_thread->current_state ) ) { - - _Priority_Add_to_bit_map( &the_thread->Priority_map ); - - _Chain_Append_unprotected( the_thread->ready, &the_thread->Object.Node ); - - _ISR_Flash( level ); - - if ( the_thread->current_priority < _Thread_Heir->current_priority ) { - _Thread_Heir = the_thread; - if ( _Thread_Executing->is_preemptible || - the_thread->current_priority == 0 ) - _Context_Switch_necessary = TRUE; - } - } - _ISR_Enable( level ); -} - -/*PAGE - * - * _Thread_Set_state - * - * This kernel routine sets the requested state in the THREAD. The - * THREAD chain is adjusted if necessary. - * - * Input parameters: - * the_thread - pointer to thread control block - * state - state to be set - * - * Output parameters: NONE - * - * INTERRUPT LATENCY: - * ready chain - * select map - */ - -void _Thread_Set_state( - Thread_Control *the_thread, - States_Control state -) -{ - ISR_Level level; - Chain_Control *ready; - - ready = the_thread->ready; - _ISR_Disable( level ); - if ( !_States_Is_ready( the_thread->current_state ) ) { - the_thread->current_state = - _States_Set( state, the_thread->current_state ); - _ISR_Enable( level ); - return; - } - - the_thread->current_state = state; - - if ( _Chain_Has_only_one_node( ready ) ) { - - _Chain_Initialize_empty( ready ); - _Priority_Remove_from_bit_map( &the_thread->Priority_map ); - - } else - _Chain_Extract_unprotected( &the_thread->Object.Node ); - - _ISR_Flash( level ); - - if ( _Thread_Is_heir( the_thread ) ) - _Thread_Calculate_heir(); - - if ( _Thread_Is_executing( the_thread ) ) - _Context_Switch_necessary = TRUE; - - _ISR_Enable( level ); -} - -/*PAGE - * - * _Thread_Set_transient - * - * This kernel routine places the requested thread in the transient state - * which will remove it from the ready queue, if necessary. No - * rescheduling is necessary because it is assumed that the transient - * state will be cleared before dispatching is enabled. - * - * Input parameters: - * the_thread - pointer to thread control block - * - * Output parameters: NONE - * - * INTERRUPT LATENCY: - * only case - */ - -void _Thread_Set_transient( - Thread_Control *the_thread -) -{ - ISR_Level level; - unsigned32 old_state; - Chain_Control *ready; - - ready = the_thread->ready; - _ISR_Disable( level ); - - old_state = the_thread->current_state; - the_thread->current_state = _States_Set( STATES_TRANSIENT, old_state ); - - if ( _States_Is_ready( old_state ) ) { - if ( _Chain_Has_only_one_node( ready ) ) { - - _Chain_Initialize_empty( ready ); - _Priority_Remove_from_bit_map( &the_thread->Priority_map ); - - } else - _Chain_Extract_unprotected( &the_thread->Object.Node ); - } - - _ISR_Enable( level ); - -} - -/*PAGE - * - * _Thread_Reset_timeslice - * - * This routine will remove the running thread from the ready chain - * and place it immediately at the rear of this chain and then the - * timeslice counter is reset. The heir THREAD will be updated if - * the running is also the currently the heir. - * - * Input parameters: NONE - * - * Output parameters: NONE - * - * INTERRUPT LATENCY: - * ready chain - * select heir - */ - -void _Thread_Reset_timeslice( void ) -{ - ISR_Level level; - Thread_Control *executing; - Chain_Control *ready; - - executing = _Thread_Executing; - ready = executing->ready; - _ISR_Disable( level ); - if ( _Chain_Has_only_one_node( ready ) ) { - _Thread_Ticks_remaining_in_timeslice = _Thread_Ticks_per_timeslice; - _ISR_Enable( level ); - return; - } - _Chain_Extract_unprotected( &executing->Object.Node ); - _Chain_Append_unprotected( ready, &executing->Object.Node ); - - _ISR_Flash( level ); - - if ( _Thread_Is_heir( executing ) ) - _Thread_Heir = (Thread_Control *) ready->first; - - _Context_Switch_necessary = TRUE; - - _ISR_Enable( level ); -} - -/*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 ) -{ - if ( !_Thread_Executing->is_timeslice || - !_Thread_Executing->is_preemptible || - !_States_Is_ready( _Thread_Executing->current_state ) ) - return; - - if ( --_Thread_Ticks_remaining_in_timeslice == 0 ) { - _Thread_Reset_timeslice(); - } -} - -/*PAGE - * - * _Thread_Yield_processor - * - * This kernel routine will remove the running THREAD from the ready chain - * and place it immediatly at the rear of this chain. Reset timeslice - * and yield the processor functions both use this routine, therefore if - * reset is TRUE and this is the only thread on the chain then the - * timeslice counter is reset. The heir THREAD will be updated if the - * running is also the currently the heir. - * - * Input parameters: NONE - * - * Output parameters: NONE - * - * INTERRUPT LATENCY: - * ready chain - * select heir - */ - -void _Thread_Yield_processor( void ) -{ - ISR_Level level; - Thread_Control *executing; - Chain_Control *ready; - - executing = _Thread_Executing; - ready = executing->ready; - _ISR_Disable( level ); - if ( !_Chain_Has_only_one_node( ready ) ) { - _Chain_Extract_unprotected( &executing->Object.Node ); - _Chain_Append_unprotected( ready, &executing->Object.Node ); - - _ISR_Flash( level ); - - if ( _Thread_Is_heir( executing ) ) - _Thread_Heir = (Thread_Control *) ready->first; - _Context_Switch_necessary = TRUE; - } - else if ( !_Thread_Is_heir( executing ) ) - _Context_Switch_necessary = TRUE; - - _ISR_Enable( level ); -} - -/*PAGE - * - * _Thread_Load_environment - * - * Load starting environment for another thread from its start area in the - * thread. Only called from t_restart and t_start. - * - * Input parameters: - * the_thread - thread control block pointer - * - * Output parameters: NONE - */ - -void _Thread_Load_environment( - Thread_Control *the_thread -) -{ - boolean is_fp = FALSE; - - if ( the_thread->Start.fp_context ) { - the_thread->fp_context = the_thread->Start.fp_context; - _Context_Initialize_fp( &the_thread->fp_context ); - is_fp = TRUE; - } - - the_thread->do_post_task_switch_extension = FALSE; - the_thread->is_preemptible = the_thread->Start.is_preemptible; - the_thread->is_timeslice = the_thread->Start.is_timeslice; - - _Context_Initialize( - &the_thread->Registers, - the_thread->Start.Initial_stack.area, - the_thread->Start.Initial_stack.size, - the_thread->Start.isr_level, - _Thread_Handler, - is_fp - ); - -} - -/*PAGE - * - * _Thread_Handler - * - * This routine is the default thread exitted error handler. It is - * returned to when a thread exits. The configured fatal error handler - * is invoked to process the exit. - * - * Input parameters: NONE - * - * Output parameters: NONE - */ - -void _Thread_Handler( void ) -{ - Thread_Control *executing; - - executing = _Thread_Executing; - - /* - * Take care that 'begin' extensions get to complete before - * 'switch' extensions can run. This means must keep dispatch - * disabled until all 'begin' extensions complete. - */ - - _User_extensions_Thread_begin( executing ); - - /* - * At this point, the dispatch disable level BETTER be 1. - */ - - _Thread_Enable_dispatch(); - - switch ( executing->Start.prototype ) { - case THREAD_START_NUMERIC: - (*executing->Start.entry_point)( executing->Start.numeric_argument ); - break; - case THREAD_START_POINTER: - (*executing->Start.entry_point)( executing->Start.pointer_argument ); - break; - case THREAD_START_BOTH_POINTER_FIRST: - (*executing->Start.entry_point)( - executing->Start.pointer_argument, - executing->Start.numeric_argument - ); - break; - case THREAD_START_BOTH_NUMERIC_FIRST: - (*executing->Start.entry_point)( - executing->Start.numeric_argument, - executing->Start.pointer_argument - ); - break; - } - - _User_extensions_Thread_exitted( executing ); - - _Internal_error_Occurred( - INTERNAL_ERROR_CORE, - TRUE, - INTERNAL_ERROR_THREAD_EXITTED - ); -} - -/*PAGE - * - * _Thread_Delay_ended - * - * This routine processes a thread whose delay period has ended. - * It is called by the watchdog handler. - * - * Input parameters: - * id - thread id - * - * Output parameters: NONE - */ - -void _Thread_Delay_ended( - Objects_Id id, - void *ignored -) -{ - Thread_Control *the_thread; - Objects_Locations location; - - the_thread = _Thread_Get( id, &location ); - switch ( location ) { - case OBJECTS_ERROR: - case OBJECTS_REMOTE: /* impossible */ - break; - case OBJECTS_LOCAL: - _Thread_Unblock( the_thread ); - _Thread_Unnest_dispatch(); - break; - } -} - -/*PAGE - * - * _Thread_Change_priority - * - * This kernel routine changes the priority of the thread. The - * thread chain is adjusted if necessary. - * - * Input parameters: - * the_thread - pointer to thread control block - * new_priority - ultimate priority - * - * Output parameters: NONE - * - * INTERRUPT LATENCY: - * ready chain - * select heir - */ - -void _Thread_Change_priority( - Thread_Control *the_thread, - Priority_Control new_priority -) -{ - ISR_Level level; - - _Thread_Set_transient( the_thread ); - - if ( the_thread->current_priority != new_priority ) - _Thread_Set_priority( the_thread, new_priority ); - - _ISR_Disable( level ); - - the_thread->current_state = - _States_Clear( STATES_TRANSIENT, the_thread->current_state ); - - if ( ! _States_Is_ready( the_thread->current_state ) ) { - _ISR_Enable( level ); - return; - } - - _Priority_Add_to_bit_map( &the_thread->Priority_map ); - _Chain_Append_unprotected( the_thread->ready, &the_thread->Object.Node ); - - _ISR_Flash( level ); - - _Thread_Calculate_heir(); - - if ( !_Thread_Is_executing_also_the_heir() && - _Thread_Executing->is_preemptible ) - _Context_Switch_necessary = TRUE; - - _ISR_Enable( level ); -} - -/*PAGE - * - * _Thread_Set_priority - * - * This directive enables and disables several modes of - * execution for the requesting thread. - * - * Input parameters: - * the_thread - pointer to thread priority - * new_priority - new priority - * - * Output: NONE - */ - -void _Thread_Set_priority( - Thread_Control *the_thread, - Priority_Control new_priority -) -{ - the_thread->current_priority = new_priority; - the_thread->ready = &_Thread_Ready_chain[ new_priority ]; - - _Priority_Initialize_information( &the_thread->Priority_map, new_priority ); -} - -/*PAGE - * - * _Thread_Evaluate_mode - * - * XXX - */ - -boolean _Thread_Evaluate_mode( void ) -{ - Thread_Control *executing; - - executing = _Thread_Executing; - - if ( !_States_Is_ready( executing->current_state ) || - ( !_Thread_Is_heir( executing ) && executing->is_preemptible ) ) { - _Context_Switch_necessary = TRUE; - return TRUE; - } - - return FALSE; -} - -/*PAGE - * - * _Thread_Get - * - * NOTE: If we are not using static inlines, this must be a real - * subroutine call. - * - * NOTE: XXX... This routine may be able to be optimized. - */ - -#ifndef USE_INLINES - -Thread_Control *_Thread_Get ( - Objects_Id id, - Objects_Locations *location -) -{ - Objects_Classes the_class; - Objects_Information *information; - - if ( _Objects_Are_ids_equal( id, OBJECTS_ID_OF_SELF ) ) { - _Thread_Disable_dispatch(); - *location = OBJECTS_LOCAL; - return( _Thread_Executing ); - } - - the_class = _Objects_Get_class( id ); - - if ( the_class > OBJECTS_CLASSES_LAST ) { - *location = OBJECTS_ERROR; - return (Thread_Control *) 0; - } - - information = _Objects_Information_table[ the_class ]; - - if ( !information || !information->is_thread ) { - *location = OBJECTS_ERROR; - return (Thread_Control *) 0; - } - - return (Thread_Control *) _Objects_Get( information, id, location ); -} - -#endif - -/*PAGE - * - * _Thread_Idle_body - * - * This kernel routine is the idle thread. The idle thread runs any time - * no other thread is ready to run. This thread loops forever with - * interrupts enabled. - * - * Input parameters: - * ignored - this parameter is ignored - * - * Output parameters: NONE - */ - -#if (CPU_PROVIDES_IDLE_THREAD_BODY == FALSE) -Thread _Thread_Idle_body( - unsigned32 ignored -) -{ - for( ; ; ) ; -} -#endif |