void _Thread_Create_idle( void )
{
#if defined(RTEMS_SMP)
int cpu;
for ( cpu=0 ; cpu < _SMP_Processor_count ; cpu++ ) {
_Thread_Create_idle_helper(
_Objects_Build_name( 'I', 'D', 'L', 'E' ),
cpu
);
}
#else
_Thread_Create_idle_helper(_Objects_Build_name( 'I', 'D', 'L', 'E' ), 0);
#endif
}
rtems_name rtems_build_name(
char C1,
char C2,
char C3,
char C4
)
{
return _Objects_Build_name( C1, C2, C3, C4 );
}
static void _Thread_Create_idle_for_cpu( Per_CPU_Control *cpu )
{
Objects_Name name;
Thread_Control *idle;
const Scheduler_Control *scheduler;
name.name_u32 = _Objects_Build_name( 'I', 'D', 'L', 'E' );
/*
* The entire workspace is zeroed during its initialization. Thus, all
* fields not explicitly assigned were explicitly zeroed by
* _Workspace_Initialization.
*/
idle = _Thread_Internal_allocate();
_Thread_Initialize(
&_Thread_Internal_information,
idle,
_Scheduler_Get_by_CPU( cpu ),
NULL, /* allocate the stack */
_Stack_Ensure_minimum( rtems_configuration_get_idle_task_stack_size() ),
CPU_IDLE_TASK_IS_FP,
PRIORITY_MAXIMUM,
true, /* preemptable */
THREAD_CPU_BUDGET_ALGORITHM_NONE,
NULL, /* no budget algorithm callout */
0, /* all interrupts enabled */
name
);
/*
* WARNING!!! This is necessary to "kick" start the system and
* MUST be done before _Thread_Start is invoked.
*/
cpu->heir =
cpu->executing = idle;
idle->Start.Entry.adaptor = _Thread_Entry_adaptor_idle;
idle->Start.Entry.Kinds.Idle.entry = rtems_configuration_get_idle_task();
_Thread_Load_environment( idle );
scheduler = _Scheduler_Get_by_CPU( cpu );
#if defined(RTEMS_SMP)
if (scheduler == NULL) {
return;
}
#endif
idle->current_state = STATES_READY;
_Scheduler_Start_idle( scheduler, idle, cpu );
_User_extensions_Thread_start( idle );
}
bool _Objects_Set_name(
Objects_Information *information,
Objects_Control *the_object,
const char *name
)
{
size_t length;
const char *s;
s = name;
length = strnlen( name, information->name_length );
#if defined(RTEMS_SCORE_OBJECT_ENABLE_STRING_NAMES)
if ( information->is_string ) {
char *d;
d = _Workspace_Allocate( length + 1 );
if ( !d )
return false;
if ( the_object->name.name_p ) {
_Workspace_Free( (void *)the_object->name.name_p );
the_object->name.name_p = NULL;
}
strncpy( d, name, length );
d[length] = '\0';
the_object->name.name_p = d;
} else
#endif
{
the_object->name.name_u32 = _Objects_Build_name(
((0 <= length) ? s[ 0 ] : ' '),
((1 < length) ? s[ 1 ] : ' '),
((2 < length) ? s[ 2 ] : ' '),
((3 < length) ? s[ 3 ] : ' ')
);
}
return true;
}
void _MPCI_Create_server( void )
{
Objects_Name name;
if ( !_System_state_Is_multiprocessing )
return;
/*
* Initialize the MPCI Receive Server
*/
_MPCI_Receive_server_tcb = _Thread_Internal_allocate();
name.name_u32 = _Objects_Build_name( 'M', 'P', 'C', 'I' );
_Thread_Initialize(
&_Thread_Internal_information,
_MPCI_Receive_server_tcb,
NULL, /* allocate the stack */
_Stack_Minimum() +
CPU_MPCI_RECEIVE_SERVER_EXTRA_STACK +
_Configuration_MP_table->extra_mpci_receive_server_stack,
CPU_ALL_TASKS_ARE_FP,
PRIORITY_MINIMUM,
false, /* no preempt */
THREAD_CPU_BUDGET_ALGORITHM_NONE,
NULL, /* no budget algorithm callout */
0, /* all interrupts enabled */
name
);
_Thread_Start(
_MPCI_Receive_server_tcb,
THREAD_START_NUMERIC,
(void *) _MPCI_Receive_server,
NULL,
0,
NULL
);
}
/**
* @brief rtems_timer_initiate_server
*
* This directive creates and starts the server for task-based timers.
* It must be invoked before any task-based timers can be initiated.
*
* @param[in] priority is the timer server priority
* @param[in] stack_size is the stack size in bytes
* @param[in] attribute_set is the timer server attributes
*
* @return This method returns RTEMS_SUCCESSFUL if successful and an
* error code otherwise.
*/
rtems_status_code rtems_timer_initiate_server(
uint32_t priority,
uint32_t stack_size,
rtems_attribute attribute_set
)
{
rtems_id id;
rtems_status_code status;
rtems_task_priority _priority;
static bool initialized = false;
bool tmpInitialized;
Timer_server_Control *ts = &_Timer_server_Default;
/*
* Make sure the requested priority is valid. The if is
* structured so we check it is invalid before looking for
* a specific invalid value as the default.
*/
_priority = priority;
if ( !_RTEMS_tasks_Priority_is_valid( priority ) ) {
if ( priority != RTEMS_TIMER_SERVER_DEFAULT_PRIORITY )
return RTEMS_INVALID_PRIORITY;
_priority = 0;
}
/*
* Just to make sure this is only called once.
*/
_Thread_Disable_dispatch();
tmpInitialized = initialized;
initialized = true;
_Thread_Enable_dispatch();
if ( tmpInitialized )
return RTEMS_INCORRECT_STATE;
/*
* Create the Timer Server with the name the name of "TIME". The attribute
* RTEMS_SYSTEM_TASK allows us to set a priority to 0 which will makes it
* higher than any other task in the system. It can be viewed as a low
* priority interrupt. It is also always NO_PREEMPT so it looks like
* an interrupt to other tasks.
*
* We allow the user to override the default priority because the Timer
* Server can invoke TSRs which must adhere to language run-time or
* other library rules. For example, if using a TSR written in Ada the
* Server should run at the same priority as the priority Ada task.
* Otherwise, the priority ceiling for the mutex used to protect the
* GNAT run-time is violated.
*/
status = rtems_task_create(
_Objects_Build_name('T','I','M','E'), /* "TIME" */
_priority, /* create with priority 1 since 0 is illegal */
stack_size, /* let user specify stack size */
RTEMS_NO_PREEMPT, /* no preempt is like an interrupt */
/* user may want floating point but we need */
/* system task specified for 0 priority */
attribute_set | RTEMS_SYSTEM_TASK,
&id /* get the id back */
);
if (status) {
initialized = false;
return status;
}
/*
* Do all the data structure initialization before starting the
* Timer Server so we do not have to have a critical section.
*/
/*
* We work with the TCB pointer, not the ID, so we need to convert
* to a TCB pointer from here out.
*/
ts->thread = (Thread_Control *)_Objects_Get_local_object(
&_RTEMS_tasks_Information,
_Objects_Get_index(id)
);
/*
* Initialize the timer lists that the server will manage.
*/
_Chain_Initialize_empty( &ts->Interval_watchdogs.Chain );
_Chain_Initialize_empty( &ts->TOD_watchdogs.Chain );
/*
* Initialize the timers that will be used to control when the
* Timer Server wakes up and services the task-based timers.
*/
_Watchdog_Initialize(
&ts->Interval_watchdogs.System_watchdog,
_Thread_Delay_ended,
id,
NULL
);
_Watchdog_Initialize(
&ts->TOD_watchdogs.System_watchdog,
_Thread_Delay_ended,
id,
NULL
);
/*
* Initialize the pointer to the timer schedule method so applications that
* do not use the Timer Server do not have to pull it in.
*/
ts->schedule_operation = _Timer_server_Schedule_operation_method;
ts->Interval_watchdogs.last_snapshot = _Watchdog_Ticks_since_boot;
ts->TOD_watchdogs.last_snapshot = (Watchdog_Interval) _TOD_Seconds_since_epoch();
ts->insert_chain = NULL;
ts->active = false;
/*
* The default timer server is now available.
*/
_Timer_server = ts;
/*
* Start the timer server
*/
status = rtems_task_start(
id,
_Timer_server_Body,
(rtems_task_argument) ts
);
#if defined(RTEMS_DEBUG)
/*
* One would expect a call to rtems_task_delete() here to clean up
* but there is actually no way (in normal circumstances) that the
* start can fail. The id and starting address are known to be
* be good. If this service fails, something is weirdly wrong on the
* target such as a stray write in an ISR or incorrect memory layout.
*/
if (status) {
initialized = false;
}
#endif
return status;
}
