int pthread_spin_init(
pthread_spinlock_t *spinlock,
int pshared
)
{
#if defined(RTEMS_SMP) && defined(POSIX_SPINLOCKS_ARE_SELF_CONTAINED)
POSIX_Spinlock_Control *the_spinlock;
the_spinlock = _POSIX_Spinlock_Get( spinlock );
_SMP_ticket_lock_Initialize( &the_spinlock->Lock );
#endif
return 0;
}
void _SMP_Handler_initialize( void )
{
uint32_t cpu_max = rtems_configuration_get_maximum_processors();
uint32_t cpu_count;
uint32_t cpu_index;
for ( cpu_index = 0 ; cpu_index < cpu_max; ++cpu_index ) {
Per_CPU_Control *cpu = _Per_CPU_Get_by_index( cpu_index );
_ISR_lock_Initialize( &cpu->Watchdog.Lock, "Watchdog" );
_SMP_ticket_lock_Initialize( &cpu->Lock );
_SMP_lock_Stats_initialize( &cpu->Lock_stats, "Per-CPU" );
_Chain_Initialize_empty( &cpu->Threads_in_need_for_help );
}
/*
* Discover and initialize the secondary cores in an SMP system.
*/
cpu_count = _CPU_SMP_Initialize();
cpu_count = cpu_count < cpu_max ? cpu_count : cpu_max;
_SMP_Processor_count = cpu_count;
for ( cpu_index = cpu_count ; cpu_index < cpu_max; ++cpu_index ) {
const Scheduler_Assignment *assignment;
assignment = _Scheduler_Get_initial_assignment( cpu_index );
if ( _Scheduler_Is_mandatory_processor( assignment ) ) {
_SMP_Fatal( SMP_FATAL_MANDATORY_PROCESSOR_NOT_PRESENT );
}
}
_SMP_Start_processors( cpu_count );
_CPU_SMP_Finalize_initialization( cpu_count );
}
bool _Thread_Initialize(
Thread_Information *information,
Thread_Control *the_thread,
const Scheduler_Control *scheduler,
void *stack_area,
size_t stack_size,
bool is_fp,
Priority_Control priority,
bool is_preemptible,
Thread_CPU_budget_algorithms budget_algorithm,
Thread_CPU_budget_algorithm_callout budget_callout,
uint32_t isr_level,
Objects_Name name
)
{
uintptr_t tls_size = _TLS_Get_size();
size_t actual_stack_size = 0;
void *stack = NULL;
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
void *fp_area = NULL;
#endif
bool extension_status;
size_t i;
bool scheduler_node_initialized = false;
Per_CPU_Control *cpu = _Per_CPU_Get_by_index( 0 );
#if defined( RTEMS_SMP )
if ( rtems_configuration_is_smp_enabled() && !is_preemptible ) {
return false;
}
#endif
memset(
&the_thread->current_state,
0,
information->Objects.size - offsetof( Thread_Control, current_state )
);
for ( i = 0 ; i < _Thread_Control_add_on_count ; ++i ) {
const Thread_Control_add_on *add_on = &_Thread_Control_add_ons[ i ];
*(void **) ( (char *) the_thread + add_on->destination_offset ) =
(char *) the_thread + add_on->source_offset;
}
/*
* Allocate and Initialize the stack for this thread.
*/
#if !defined(RTEMS_SCORE_THREAD_ENABLE_USER_PROVIDED_STACK_VIA_API)
actual_stack_size = _Thread_Stack_Allocate( the_thread, stack_size );
if ( !actual_stack_size || actual_stack_size < stack_size )
return false; /* stack allocation failed */
stack = the_thread->Start.stack;
#else
if ( !stack_area ) {
actual_stack_size = _Thread_Stack_Allocate( the_thread, stack_size );
if ( !actual_stack_size || actual_stack_size < stack_size )
return false; /* stack allocation failed */
stack = the_thread->Start.stack;
the_thread->Start.core_allocated_stack = true;
} else {
stack = stack_area;
actual_stack_size = stack_size;
the_thread->Start.core_allocated_stack = false;
}
#endif
_Stack_Initialize(
&the_thread->Start.Initial_stack,
stack,
actual_stack_size
);
/* Thread-local storage (TLS) area allocation */
if ( tls_size > 0 ) {
uintptr_t tls_align = _TLS_Heap_align_up( (uintptr_t) _TLS_Alignment );
uintptr_t tls_alloc = _TLS_Get_allocation_size( tls_size, tls_align );
the_thread->Start.tls_area =
_Workspace_Allocate_aligned( tls_alloc, tls_align );
if ( the_thread->Start.tls_area == NULL ) {
goto failed;
}
}
/*
* Allocate the floating point area for this thread
*/
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
if ( is_fp ) {
fp_area = _Workspace_Allocate( CONTEXT_FP_SIZE );
if ( !fp_area )
goto failed;
fp_area = _Context_Fp_start( fp_area, 0 );
}
the_thread->fp_context = fp_area;
the_thread->Start.fp_context = fp_area;
#endif
/*
* Get thread queue heads
*/
the_thread->Wait.spare_heads = _Freechain_Get(
&information->Free_thread_queue_heads,
_Workspace_Allocate,
_Objects_Extend_size( &information->Objects ),
THREAD_QUEUE_HEADS_SIZE( _Scheduler_Count )
);
if ( the_thread->Wait.spare_heads == NULL ) {
goto failed;
}
_Thread_queue_Heads_initialize( the_thread->Wait.spare_heads );
/*
* General initialization
*/
the_thread->is_fp = is_fp;
the_thread->Start.isr_level = isr_level;
the_thread->Start.is_preemptible = is_preemptible;
the_thread->Start.budget_algorithm = budget_algorithm;
the_thread->Start.budget_callout = budget_callout;
_Thread_Timer_initialize( &the_thread->Timer, cpu );
switch ( budget_algorithm ) {
case THREAD_CPU_BUDGET_ALGORITHM_NONE:
case THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE:
break;
#if defined(RTEMS_SCORE_THREAD_ENABLE_EXHAUST_TIMESLICE)
case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE:
the_thread->cpu_time_budget =
rtems_configuration_get_ticks_per_timeslice();
break;
#endif
#if defined(RTEMS_SCORE_THREAD_ENABLE_SCHEDULER_CALLOUT)
case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT:
break;
#endif
}
#if defined(RTEMS_SMP)
RTEMS_STATIC_ASSERT( THREAD_SCHEDULER_BLOCKED == 0, Scheduler_state );
the_thread->Scheduler.own_control = scheduler;
the_thread->Scheduler.control = scheduler;
the_thread->Scheduler.own_node = the_thread->Scheduler.node;
_Resource_Node_initialize( &the_thread->Resource_node );
the_thread->Lock.current = &the_thread->Lock.Default;
_SMP_ticket_lock_Initialize( &the_thread->Lock.Default );
_SMP_lock_Stats_initialize( &the_thread->Lock.Stats, "Thread Lock" );
_SMP_lock_Stats_initialize( &the_thread->Potpourri_stats, "Thread Potpourri" );
#endif
_Thread_Debug_set_real_processor( the_thread, cpu );
/* Initialize the CPU for the non-SMP schedulers */
_Thread_Set_CPU( the_thread, cpu );
_Thread_queue_Initialize( &the_thread->Join_queue );
the_thread->current_state = STATES_DORMANT;
the_thread->Wait.operations = &_Thread_queue_Operations_default;
the_thread->current_priority = priority;
the_thread->real_priority = priority;
the_thread->Start.initial_priority = priority;
RTEMS_STATIC_ASSERT( THREAD_WAIT_FLAGS_INITIAL == 0, Wait_flags );
_Scheduler_Node_initialize( scheduler, the_thread );
scheduler_node_initialized = true;
_Scheduler_Update_priority( the_thread, priority );
/* POSIX Keys */
_RBTree_Initialize_empty( &the_thread->Keys.Key_value_pairs );
_ISR_lock_Initialize( &the_thread->Keys.Lock, "POSIX Key Value Pairs" );
_Thread_Action_control_initialize( &the_thread->Post_switch_actions );
RTEMS_STATIC_ASSERT( THREAD_LIFE_NORMAL == 0, Life_state );
/*
* Open the object
*/
_Objects_Open( &information->Objects, &the_thread->Object, name );
/*
* We assume the Allocator Mutex is locked and dispatching is
* enabled when we get here. We want to be able to run the
* user extensions with dispatching enabled. The Allocator
* Mutex provides sufficient protection to let the user extensions
* run safely.
*/
extension_status = _User_extensions_Thread_create( the_thread );
if ( extension_status )
return true;
failed:
if ( scheduler_node_initialized ) {
_Scheduler_Node_destroy( scheduler, the_thread );
}
_Workspace_Free( the_thread->Start.tls_area );
_Freechain_Put(
&information->Free_thread_queue_heads,
the_thread->Wait.spare_heads
);
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
_Workspace_Free( fp_area );
#endif
_Thread_Stack_Free( the_thread );
return false;
}
