void _Mutex_recursive_Release( struct _Mutex_recursive_Control *_mutex )
{
Mutex_recursive_Control *mutex;
Thread_queue_Context queue_context;
ISR_Level level;
Thread_Control *executing;
unsigned int nest_level;
mutex = _Mutex_recursive_Get( _mutex );
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_ISR_disable( &queue_context, level );
executing = _Mutex_Queue_acquire_critical( &mutex->Mutex, &queue_context );
_Assert( mutex->Mutex.Queue.Queue.owner == executing );
nest_level = mutex->nest_level;
if ( __predict_true( nest_level == 0 ) ) {
_Mutex_Release_critical( &mutex->Mutex, executing, level, &queue_context );
} else {
mutex->nest_level = nest_level - 1;
_Mutex_Queue_release( &mutex->Mutex, level, &queue_context );
}
}
void _Mutex_recursive_Acquire( struct _Mutex_recursive_Control *_mutex )
{
Mutex_recursive_Control *mutex;
Thread_queue_Context queue_context;
Thread_Control *executing;
Thread_Control *owner;
mutex = _Mutex_recursive_Get( _mutex );
_Thread_queue_Context_initialize( &queue_context );
executing = _Mutex_Queue_acquire( &mutex->Mutex, &queue_context );
owner = mutex->Mutex.Queue.Queue.owner;
if ( __predict_true( owner == NULL ) ) {
mutex->Mutex.Queue.Queue.owner = executing;
++executing->resource_count;
_Mutex_Queue_release( &mutex->Mutex, &queue_context );
} else if ( owner == executing ) {
++mutex->nest_level;
_Mutex_Queue_release( &mutex->Mutex, &queue_context );
} else {
_Thread_queue_Context_set_no_timeout( &queue_context );
_Mutex_Acquire_slow( &mutex->Mutex, owner, executing, &queue_context );
}
}
void _Thread_queue_Extract( Thread_Control *the_thread )
{
Thread_queue_Context queue_context;
Thread_queue_Queue *queue;
_Thread_queue_Context_initialize( &queue_context );
_Thread_Wait_acquire( the_thread, &queue_context );
queue = the_thread->Wait.queue;
if ( queue != NULL ) {
bool unblock;
_Thread_Wait_remove_request( the_thread, &queue_context.Lock_context );
_Thread_queue_Context_set_MP_callout(
&queue_context,
_Thread_queue_MP_callout_do_nothing
);
unblock = _Thread_queue_Extract_locked(
queue,
the_thread->Wait.operations,
the_thread,
&queue_context
);
_Thread_queue_Unblock_critical(
unblock,
queue,
the_thread,
&queue_context.Lock_context.Lock_context
);
} else {
_Thread_Wait_release( the_thread, &queue_context );
}
}
int _Mutex_Try_acquire( struct _Mutex_Control *_mutex )
{
Mutex_Control *mutex;
Thread_queue_Context queue_context;
Thread_Control *executing;
Thread_Control *owner;
int eno;
mutex = _Mutex_Get( _mutex );
_Thread_queue_Context_initialize( &queue_context );
executing = _Mutex_Queue_acquire( mutex, &queue_context );
owner = mutex->Queue.Queue.owner;
if ( __predict_true( owner == NULL ) ) {
mutex->Queue.Queue.owner = executing;
++executing->resource_count;
eno = 0;
} else {
eno = EBUSY;
}
_Mutex_Queue_release( mutex, &queue_context );
return eno;
}
Thread_Control *_Thread_queue_Do_dequeue(
Thread_queue_Control *the_thread_queue,
const Thread_queue_Operations *operations
#if defined(RTEMS_MULTIPROCESSING)
,
Thread_queue_MP_callout mp_callout
#endif
)
{
Thread_queue_Context queue_context;
Thread_Control *the_thread;
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_set_MP_callout( &queue_context, mp_callout );
_Thread_queue_Acquire( the_thread_queue, &queue_context );
the_thread = _Thread_queue_First_locked( the_thread_queue, operations );
if ( the_thread != NULL ) {
_Thread_queue_Extract_critical(
&the_thread_queue->Queue,
operations,
the_thread,
&queue_context
);
} else {
_Thread_queue_Release( the_thread_queue, &queue_context );
}
return the_thread;
}
void _Semaphore_Post( struct _Semaphore_Control *_sem )
{
Semaphore_Control *sem;
Thread_queue_Context queue_context;
Thread_queue_Heads *heads;
sem = _Semaphore_Get( _sem );
_Thread_queue_Context_initialize( &queue_context );
_Semaphore_Queue_acquire( sem, &queue_context );
heads = sem->Queue.Queue.heads;
if ( heads == NULL ) {
_Assert( sem->count < UINT_MAX );
++sem->count;
_Semaphore_Queue_release( sem, &queue_context );
} else {
const Thread_queue_Operations *operations;
Thread_Control *first;
operations = SEMAPHORE_TQ_OPERATIONS;
first = ( *operations->first )( heads );
_Thread_queue_Extract_critical(
&sem->Queue.Queue,
operations,
first,
&queue_context
);
}
}
void _Semaphore_Wait( struct _Semaphore_Control *_sem )
{
Semaphore_Control *sem ;
Thread_queue_Context queue_context;
Thread_Control *executing;
unsigned int count;
sem = _Semaphore_Get( _sem );
_Thread_queue_Context_initialize( &queue_context );
executing = _Semaphore_Queue_acquire( sem, &queue_context );
count = sem->count;
if ( count > 0 ) {
sem->count = count - 1;
_Semaphore_Queue_release( sem, &queue_context );
} else {
_Thread_queue_Context_set_expected_level( &queue_context, 1 );
_Thread_queue_Context_set_no_timeout( &queue_context );
_Thread_queue_Enqueue_critical(
&sem->Queue.Queue,
SEMAPHORE_TQ_OPERATIONS,
executing,
STATES_WAITING_FOR_SYS_LOCK_SEMAPHORE,
&queue_context
);
}
}
int _Mutex_recursive_Try_acquire( struct _Mutex_recursive_Control *_mutex )
{
Mutex_recursive_Control *mutex;
Thread_queue_Context queue_context;
ISR_Level level;
Thread_Control *executing;
Thread_Control *owner;
int eno;
mutex = _Mutex_recursive_Get( _mutex );
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_ISR_disable( &queue_context, level );
executing = _Mutex_Queue_acquire_critical( &mutex->Mutex, &queue_context );
owner = mutex->Mutex.Queue.Queue.owner;
if ( __predict_true( owner == NULL ) ) {
mutex->Mutex.Queue.Queue.owner = executing;
_Thread_Resource_count_increment( executing );
eno = 0;
} else if ( owner == executing ) {
++mutex->nest_level;
eno = 0;
} else {
eno = EBUSY;
}
_Mutex_Queue_release( &mutex->Mutex, level, &queue_context );
return eno;
}
void _Mutex_recursive_Acquire( struct _Mutex_recursive_Control *_mutex )
{
Mutex_recursive_Control *mutex;
Thread_queue_Context queue_context;
ISR_Level level;
Thread_Control *executing;
Thread_Control *owner;
mutex = _Mutex_recursive_Get( _mutex );
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_ISR_disable( &queue_context, level );
executing = _Mutex_Queue_acquire_critical( &mutex->Mutex, &queue_context );
owner = mutex->Mutex.Queue.Queue.owner;
if ( __predict_true( owner == NULL ) ) {
mutex->Mutex.Queue.Queue.owner = executing;
_Thread_Resource_count_increment( executing );
_Mutex_Queue_release( &mutex->Mutex, level, &queue_context );
} else if ( owner == executing ) {
++mutex->nest_level;
_Mutex_Queue_release( &mutex->Mutex, level, &queue_context );
} else {
_Thread_queue_Context_set_no_timeout( &queue_context );
_Mutex_Acquire_slow( &mutex->Mutex, owner, executing, level, &queue_context );
}
}
static int _POSIX_Threads_Join( pthread_t thread, void **value_ptr )
{
Thread_Control *the_thread;
Thread_queue_Context queue_context;
Per_CPU_Control *cpu_self;
Thread_Control *executing;
void *value;
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_set_expected_level( &queue_context, 1 );
the_thread = _Thread_Get( thread, &queue_context.Lock_context );
if ( the_thread == NULL ) {
return ESRCH;
}
cpu_self = _Per_CPU_Get();
executing = _Per_CPU_Get_executing( cpu_self );
if ( executing == the_thread ) {
_ISR_lock_ISR_enable( &queue_context.Lock_context );
return EDEADLK;
}
_Thread_State_acquire_critical( the_thread, &queue_context.Lock_context );
if ( !_Thread_Is_joinable( the_thread ) ) {
_Thread_State_release( the_thread, &queue_context.Lock_context );
return EINVAL;
}
if ( _States_Is_waiting_for_join_at_exit( the_thread->current_state ) ) {
value = the_thread->Life.exit_value;
_Thread_Clear_state_locked( the_thread, STATES_WAITING_FOR_JOIN_AT_EXIT );
_Thread_Dispatch_disable_with_CPU( cpu_self, &queue_context.Lock_context );
_Thread_State_release( the_thread, &queue_context.Lock_context );
_Thread_Dispatch_enable( cpu_self );
} else {
_Thread_Join(
the_thread,
STATES_INTERRUPTIBLE_BY_SIGNAL | STATES_WAITING_FOR_JOIN,
executing,
&queue_context
);
if ( _POSIX_Get_error_after_wait( executing ) != 0 ) {
_Assert( _POSIX_Get_error_after_wait( executing ) == EINTR );
return EINTR;
}
value = executing->Wait.return_argument;
}
if ( value_ptr != NULL ) {
*value_ptr = value;
}
return 0;
}
rtems_status_code rtems_task_set_scheduler(
rtems_id task_id,
rtems_id scheduler_id,
rtems_task_priority priority
)
{
const Scheduler_Control *scheduler;
Thread_Control *the_thread;
Thread_queue_Context queue_context;
ISR_lock_Context state_context;
Per_CPU_Control *cpu_self;
bool valid;
Priority_Control core_priority;
Status_Control status;
if ( !_Scheduler_Get_by_id( scheduler_id, &scheduler ) ) {
return RTEMS_INVALID_ID;
}
core_priority = _RTEMS_Priority_To_core( scheduler, priority, &valid );
if ( !valid ) {
return RTEMS_INVALID_PRIORITY;
}
_Thread_queue_Context_initialize( &queue_context );
the_thread = _Thread_Get( task_id, &queue_context.Lock_context.Lock_context );
if ( the_thread == NULL ) {
#if defined(RTEMS_MULTIPROCESSING)
if ( _Thread_MP_Is_remote( task_id ) ) {
return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
}
#endif
return RTEMS_INVALID_ID;
}
cpu_self = _Thread_Dispatch_disable_critical(
&queue_context.Lock_context.Lock_context
);
_Thread_Wait_acquire_critical( the_thread, &queue_context );
_Thread_State_acquire_critical( the_thread, &state_context );
status = _Scheduler_Set( scheduler, the_thread, core_priority );
_Thread_State_release_critical( the_thread, &state_context );
_Thread_Wait_release( the_thread, &queue_context );
_Thread_Dispatch_enable( cpu_self );
return _Status_Get( status );
}
Status_Control _CORE_RWLock_Surrender( CORE_RWLock_Control *the_rwlock )
{
Thread_queue_Context queue_context;
/*
* If unlocked, then OK to read.
* Otherwise, we have to block.
* If locked for reading and no waiters, then OK to read.
* If any thread is waiting, then we wait.
*/
_Thread_queue_Context_initialize( &queue_context );
_CORE_RWLock_Acquire( the_rwlock, &queue_context );
if ( the_rwlock->current_state == CORE_RWLOCK_UNLOCKED){
/* This is an error at the caller site */
_CORE_RWLock_Release( the_rwlock, &queue_context );
return STATUS_SUCCESSFUL;
}
if ( the_rwlock->current_state == CORE_RWLOCK_LOCKED_FOR_READING ) {
the_rwlock->number_of_readers -= 1;
if ( the_rwlock->number_of_readers != 0 ) {
/* must be unlocked again */
_CORE_RWLock_Release( the_rwlock, &queue_context );
return STATUS_SUCCESSFUL;
}
}
_Assert(
the_rwlock->current_state == CORE_RWLOCK_LOCKED_FOR_WRITING
|| ( the_rwlock->current_state == CORE_RWLOCK_LOCKED_FOR_READING
&& the_rwlock->number_of_readers == 0 )
);
/*
* Implicitly transition to "unlocked" and find another thread interested
* in obtaining this rwlock.
*/
the_rwlock->current_state = CORE_RWLOCK_UNLOCKED;
_Thread_queue_Flush_critical(
&the_rwlock->Queue.Queue,
CORE_RWLOCK_TQ_OPERATIONS,
_CORE_RWLock_Flush_filter,
&queue_context
);
return STATUS_SUCCESSFUL;
}
void _Mutex_Release( struct _Mutex_Control *_mutex )
{
Mutex_Control *mutex;
Thread_queue_Context queue_context;
Thread_Control *executing;
mutex = _Mutex_Get( _mutex );
_Thread_queue_Context_initialize( &queue_context );
executing = _Mutex_Queue_acquire( mutex, &queue_context );
_Assert( mutex->Queue.Queue.owner == executing );
_Mutex_Release_critical( mutex, executing, &queue_context );
}
int _Mutex_recursive_Acquire_timed(
struct _Mutex_recursive_Control *_mutex,
const struct timespec *abstime
)
{
Mutex_recursive_Control *mutex;
Thread_queue_Context queue_context;
ISR_Level level;
Thread_Control *executing;
Thread_Control *owner;
mutex = _Mutex_recursive_Get( _mutex );
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_ISR_disable( &queue_context, level );
executing = _Mutex_Queue_acquire_critical( &mutex->Mutex, &queue_context );
owner = mutex->Mutex.Queue.Queue.owner;
if ( __predict_true( owner == NULL ) ) {
mutex->Mutex.Queue.Queue.owner = executing;
_Thread_Resource_count_increment( executing );
_Mutex_Queue_release( &mutex->Mutex, level, &queue_context );
return 0;
} else if ( owner == executing ) {
++mutex->nest_level;
_Mutex_Queue_release( &mutex->Mutex, level, &queue_context );
return 0;
} else {
Watchdog_Interval ticks;
switch ( _TOD_Absolute_timeout_to_ticks( abstime, CLOCK_REALTIME, &ticks ) ) {
case TOD_ABSOLUTE_TIMEOUT_INVALID:
_Mutex_Queue_release( &mutex->Mutex, level, &queue_context );
return EINVAL;
case TOD_ABSOLUTE_TIMEOUT_IS_IN_PAST:
case TOD_ABSOLUTE_TIMEOUT_IS_NOW:
_Mutex_Queue_release( &mutex->Mutex, level, &queue_context );
return ETIMEDOUT;
default:
break;
}
_Thread_queue_Context_set_relative_timeout( &queue_context, ticks );
_Mutex_Acquire_slow( &mutex->Mutex, owner, executing, level, &queue_context );
return STATUS_GET_POSIX( _Thread_Wait_get_status( executing ) );
}
}
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;
}
rtems_status_code rtems_task_set_priority(
rtems_id id,
rtems_task_priority new_priority,
rtems_task_priority *old_priority_p
)
{
Thread_Control *the_thread;
Thread_queue_Context queue_context;
const Scheduler_Control *scheduler;
Priority_Control old_priority;
rtems_status_code status;
if ( old_priority_p == NULL ) {
return RTEMS_INVALID_ADDRESS;
}
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_clear_priority_updates( &queue_context );
the_thread = _Thread_Get( id, &queue_context.Lock_context.Lock_context );
if ( the_thread == NULL ) {
#if defined(RTEMS_MULTIPROCESSING)
return _RTEMS_tasks_MP_Set_priority( id, new_priority, old_priority_p );
#else
return RTEMS_INVALID_ID;
#endif
}
_Thread_Wait_acquire_critical( the_thread, &queue_context );
scheduler = _Thread_Scheduler_get_home( the_thread );
old_priority = _Thread_Get_priority( the_thread );
if ( new_priority != RTEMS_CURRENT_PRIORITY ) {
status = _RTEMS_tasks_Set_priority(
the_thread,
scheduler,
new_priority,
&queue_context
);
} else {
_Thread_Wait_release( the_thread, &queue_context );
status = RTEMS_SUCCESSFUL;
}
*old_priority_p = _RTEMS_Priority_From_core( scheduler, old_priority );
return status;
}
void _Thread_Close( Thread_Control *the_thread, Thread_Control *executing )
{
Thread_queue_Context queue_context;
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_set_expected_level( &queue_context, 2 );
_Thread_queue_Context_set_no_timeout( &queue_context );
_Thread_State_acquire( the_thread, &queue_context.Lock_context.Lock_context );
_Thread_Join(
the_thread,
STATES_WAITING_FOR_JOIN,
executing,
&queue_context
);
_Thread_Cancel( the_thread, executing, NULL );
}
void _Thread_Restart_self(
Thread_Control *executing,
const Thread_Entry_information *entry,
ISR_lock_Context *lock_context
)
{
Per_CPU_Control *cpu_self;
Thread_queue_Context queue_context;
_Assert(
_Watchdog_Get_state( &executing->Timer.Watchdog ) == WATCHDOG_INACTIVE
);
_Assert(
executing->current_state == STATES_READY
|| executing->current_state == STATES_SUSPENDED
);
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_clear_priority_updates( &queue_context );
_Thread_State_acquire_critical( executing, lock_context );
executing->Start.Entry = *entry;
_Thread_Change_life_locked(
executing,
0,
THREAD_LIFE_RESTARTING,
THREAD_LIFE_PROTECTED | THREAD_LIFE_CHANGE_DEFERRED
);
cpu_self = _Thread_Dispatch_disable_critical( lock_context );
_Thread_State_release( executing, lock_context );
_Thread_Wait_acquire_default( executing, lock_context );
_Thread_Priority_change(
executing,
&executing->Real_priority,
executing->Start.initial_priority,
false,
&queue_context
);
_Thread_Wait_release_default( executing, lock_context );
_Thread_Priority_update( &queue_context );
_Thread_Dispatch_enable( cpu_self );
RTEMS_UNREACHABLE();
}
int sem_post( sem_t *_sem )
{
Sem_Control *sem;
ISR_Level level;
Thread_queue_Context queue_context;
Thread_queue_Heads *heads;
unsigned int count;
POSIX_SEMAPHORE_VALIDATE_OBJECT( _sem );
sem = _Sem_Get( &_sem->_Semaphore );
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_ISR_disable( &queue_context, level );
_Sem_Queue_acquire_critical( sem, &queue_context );
heads = sem->Queue.Queue.heads;
count = sem->count;
if ( __predict_true( heads == NULL && count < SEM_VALUE_MAX ) ) {
sem->count = count + 1;
_Sem_Queue_release( sem, level, &queue_context );
return 0;
}
if ( __predict_true( heads != NULL ) ) {
const Thread_queue_Operations *operations;
Thread_Control *first;
_Thread_queue_Context_set_ISR_level( &queue_context, level );
operations = SEMAPHORE_TQ_OPERATIONS;
first = ( *operations->first )( heads );
_Thread_queue_Extract_critical(
&sem->Queue.Queue,
operations,
first,
&queue_context
);
return 0;
}
_Sem_Queue_release( sem, level, &queue_context );
rtems_set_errno_and_return_minus_one( EOVERFLOW );
}
static void _Thread_Wake_up_joining_threads( Thread_Control *the_thread )
{
Thread_Join_context join_context;
#if defined(RTEMS_POSIX_API)
join_context.exit_value = the_thread->Life.exit_value;
#endif
_Thread_queue_Context_initialize( &join_context.Base );
_Thread_queue_Acquire( &the_thread->Join_queue, &join_context.Base );
_Thread_queue_Flush_critical(
&the_thread->Join_queue.Queue,
THREAD_JOIN_TQ_OPERATIONS,
#if defined(RTEMS_POSIX_API)
_Thread_Join_flush_filter,
#else
_Thread_queue_Flush_default_filter,
#endif
&join_context.Base
);
}
void _API_Mutex_Lock( API_Mutex_Control *the_mutex )
{
Thread_Life_state previous_thread_life_state;
Thread_queue_Context queue_context;
previous_thread_life_state =
_Thread_Set_life_protection( THREAD_LIFE_PROTECTED );
_Thread_queue_Context_initialize( &queue_context );
_ISR_lock_ISR_disable( &queue_context.Lock_context );
_Thread_queue_Context_set_no_timeout( &queue_context );
_CORE_recursive_mutex_Seize(
&the_mutex->Mutex,
_Thread_Executing,
true,
_CORE_recursive_mutex_Seize_nested,
&queue_context
);
if ( the_mutex->Mutex.nest_level == 0 ) {
the_mutex->previous_thread_life_state = previous_thread_life_state;
}
}
int pthread_rwlock_timedwrlock(
pthread_rwlock_t *rwlock,
const struct timespec *abstime
)
{
POSIX_RWLock_Control *the_rwlock;
Thread_queue_Context queue_context;
Status_Control status;
the_rwlock = _POSIX_RWLock_Get( rwlock );
POSIX_RWLOCK_VALIDATE_OBJECT( the_rwlock );
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_set_enqueue_timeout_realtime_timespec(
&queue_context,
abstime
);
status = _CORE_RWLock_Seize_for_writing(
&the_rwlock->RWLock,
true,
&queue_context
);
return _POSIX_Get_error( status );
}
static void _Thread_Raise_real_priority(
Thread_Control *the_thread,
Priority_Control priority
)
{
Thread_queue_Context queue_context;
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_clear_priority_updates( &queue_context );
_Thread_Wait_acquire( the_thread, &queue_context );
if ( priority < the_thread->Real_priority.priority ) {
_Thread_Priority_change(
the_thread,
&the_thread->Real_priority,
priority,
false,
&queue_context
);
}
_Thread_Wait_release( the_thread, &queue_context );
_Thread_Priority_update( &queue_context );
}
static bool _Thread_queue_Path_acquire(
Thread_Control *the_thread,
Thread_queue_Queue *queue,
Thread_queue_Path *path
)
{
Thread_Control *owner;
#if defined(RTEMS_SMP)
Thread_queue_Link *link;
Thread_queue_Queue *target;
/*
* For an overview please look at the non-SMP part below. We basically do
* the same on SMP configurations. The fact that we may have more than one
* executing thread and each thread queue has its own SMP lock makes the task
* a bit more difficult. We have to avoid deadlocks at SMP lock level, since
* this would result in an unrecoverable deadlock of the overall system.
*/
_Chain_Initialize_empty( &path->Links );
owner = queue->owner;
if ( owner == NULL ) {
return true;
}
if ( owner == the_thread ) {
return false;
}
_RBTree_Initialize_node( &path->Start.Registry_node );
_Chain_Initialize_node( &path->Start.Path_node );
_Thread_queue_Context_initialize( &path->Start.Queue_context );
link = &path->Start;
do {
_Chain_Append_unprotected( &path->Links, &link->Path_node );
link->owner = owner;
_Thread_Wait_acquire_default_critical(
owner,
&link->Queue_context.Lock_context
);
target = owner->Wait.queue;
link->Queue_context.Wait.queue = target;
if ( target != NULL ) {
if ( _Thread_queue_Link_add( link, queue, target ) ) {
_Thread_queue_Gate_add(
&owner->Wait.Lock.Pending_requests,
&link->Queue_context.Wait.Gate
);
_Thread_Wait_release_default_critical(
owner,
&link->Queue_context.Lock_context
);
_Thread_Wait_acquire_queue_critical( target, &link->Queue_context );
if ( link->Queue_context.Wait.queue == NULL ) {
_Thread_queue_Link_remove( link );
_Thread_Wait_release_queue_critical( target, &link->Queue_context );
_Thread_Wait_acquire_default_critical(
owner,
&link->Queue_context.Lock_context
);
_Thread_Wait_remove_request_locked( owner, &link->Queue_context );
_Assert( owner->Wait.queue == NULL );
return true;
}
} else {
link->Queue_context.Wait.queue = NULL;
_Thread_queue_Path_release( path );
return false;
}
} else {
return true;
}
link = &owner->Wait.Link;
queue = target;
owner = queue->owner;
} while ( owner != NULL );
#else
do {
owner = queue->owner;
if ( owner == NULL ) {
return true;
}
if ( owner == the_thread ) {
return false;
}
queue = owner->Wait.queue;
} while ( queue != NULL );
#endif
return true;
}
rtems_status_code rtems_region_get_segment(
rtems_id id,
uintptr_t size,
rtems_option option_set,
rtems_interval timeout,
void **segment
)
{
rtems_status_code status;
Region_Control *the_region;
if ( segment == NULL ) {
return RTEMS_INVALID_ADDRESS;
}
*segment = NULL;
if ( size == 0 ) {
return RTEMS_INVALID_SIZE;
}
the_region = _Region_Get_and_lock( id );
if ( the_region == NULL ) {
return RTEMS_INVALID_ID;
}
if ( size > the_region->maximum_segment_size ) {
status = RTEMS_INVALID_SIZE;
} else {
void *the_segment;
the_segment = _Region_Allocate_segment( the_region, size );
if ( the_segment != NULL ) {
*segment = the_segment;
status = RTEMS_SUCCESSFUL;
} else if ( _Options_Is_no_wait( option_set ) ) {
status = RTEMS_UNSATISFIED;
} else {
Thread_queue_Context queue_context;
Thread_Control *executing;
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Acquire( &the_region->Wait_queue, &queue_context );
executing = _Thread_Executing;
executing->Wait.count = size;
executing->Wait.return_argument = segment;
/* FIXME: This is a home grown condition variable */
_Thread_queue_Context_set_thread_state(
&queue_context,
STATES_WAITING_FOR_SEGMENT
);
_Thread_queue_Context_set_timeout_ticks( &queue_context, timeout );
_Thread_queue_Context_set_enqueue_callout(
&queue_context,
_Region_Enqueue_callout
);
_Thread_queue_Enqueue(
&the_region->Wait_queue.Queue,
the_region->wait_operations,
executing,
&queue_context
);
return _Status_Get_after_wait( executing );
}
}
_Region_Unlock( the_region );
return status;
}
static void _POSIX_signals_Action_handler(
Thread_Control *executing,
Thread_Action *action,
ISR_lock_Context *lock_context
)
{
POSIX_API_Control *api;
int signo;
uint32_t hold_errno;
(void) action;
_Thread_State_release( executing, lock_context );
api = executing->API_Extensions[ THREAD_API_POSIX ];
/*
* We need to ensure that if the signal handler executes a call
* which overwrites the unblocking status, we restore it.
*/
hold_errno = executing->Wait.return_code;
/*
* api may be NULL in case of a thread close in progress
*/
if ( !api )
return;
/*
* In case the executing thread is blocked or about to block on something
* that uses the thread wait information, then this is a kernel bug.
*/
_Assert(
( _Thread_Wait_flags_get( executing )
& ( THREAD_WAIT_STATE_BLOCKED | THREAD_WAIT_STATE_INTEND_TO_BLOCK ) ) == 0
);
/*
* If we invoke any user code, there is the possibility that
* a new signal has been posted that we should process so we
* restart the loop if a signal handler was invoked.
*
* The first thing done is to check there are any signals to be
* processed at all. No point in doing this loop otherwise.
*/
while (1) {
Thread_queue_Context queue_context;
_Thread_queue_Context_initialize( &queue_context );
_POSIX_signals_Acquire( &queue_context );
if ( !(api->signals_unblocked &
(api->signals_pending | _POSIX_signals_Pending)) ) {
_POSIX_signals_Release( &queue_context );
break;
}
_POSIX_signals_Release( &queue_context );
for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) {
_POSIX_signals_Check_signal( api, signo, false );
_POSIX_signals_Check_signal( api, signo, true );
}
/* Unfortunately - nothing like __SIGFIRSTNOTRT in newlib signal .h */
for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) {
_POSIX_signals_Check_signal( api, signo, false );
_POSIX_signals_Check_signal( api, signo, true );
}
}
executing->Wait.return_code = hold_errno;
}