rtems_status_code rtems_region_create(
rtems_name name,
void *starting_address,
uintptr_t length,
uintptr_t page_size,
rtems_attribute attribute_set,
rtems_id *id
)
{
rtems_status_code return_status;
Region_Control *the_region;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !starting_address )
return RTEMS_INVALID_ADDRESS;
if ( !id )
return RTEMS_INVALID_ADDRESS;
the_region = _Region_Allocate();
if ( !the_region )
return_status = RTEMS_TOO_MANY;
else {
_Thread_queue_Initialize( &the_region->Wait_queue );
if ( _Attributes_Is_priority( attribute_set ) ) {
the_region->wait_operations = &_Thread_queue_Operations_priority;
} else {
the_region->wait_operations = &_Thread_queue_Operations_FIFO;
}
the_region->maximum_segment_size = _Heap_Initialize(
&the_region->Memory, starting_address, length, page_size
);
if ( !the_region->maximum_segment_size ) {
_Region_Free( the_region );
return_status = RTEMS_INVALID_SIZE;
} else {
the_region->attribute_set = attribute_set;
_Objects_Open(
&_Region_Information,
&the_region->Object,
(Objects_Name) name
);
*id = the_region->Object.id;
return_status = RTEMS_SUCCESSFUL;
}
}
_Objects_Allocator_unlock();
return return_status;
}
rtems_status_code rtems_timer_create(
rtems_name name,
rtems_id *id
)
{
Timer_Control *the_timer;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !id )
return RTEMS_INVALID_ADDRESS;
_Thread_Disable_dispatch(); /* to prevent deletion */
the_timer = _Timer_Allocate();
if ( !the_timer ) {
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
the_timer->the_class = TIMER_DORMANT;
_Watchdog_Initialize( &the_timer->Ticker, NULL, 0, NULL );
_Objects_Open(
&_Timer_Information,
&the_timer->Object,
(Objects_Name) name
);
*id = the_timer->Object.id;
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_extension_create(
rtems_name name,
const rtems_extensions_table *extension_table,
rtems_id *id
)
{
Extension_Control *the_extension;
if ( !id )
return RTEMS_INVALID_ADDRESS;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
_Thread_Disable_dispatch(); /* to prevent deletion */
the_extension = _Extension_Allocate();
if ( !the_extension ) {
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
_User_extensions_Add_set_with_table( &the_extension->Extension, extension_table );
_Objects_Open(
&_Extension_Information,
&the_extension->Object,
(Objects_Name) name
);
*id = the_extension->Object.id;
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_timer_create(
rtems_name name,
rtems_id *id
)
{
Timer_Control *the_timer;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !id )
return RTEMS_INVALID_ADDRESS;
the_timer = _Timer_Allocate();
if ( !the_timer ) {
_Objects_Allocator_unlock();
return RTEMS_TOO_MANY;
}
the_timer->the_class = TIMER_DORMANT;
_Watchdog_Preinitialize( &the_timer->Ticker, _Per_CPU_Get_snapshot() );
_Objects_Open(
&_Timer_Information,
&the_timer->Object,
(Objects_Name) name
);
*id = the_timer->Object.id;
_Objects_Allocator_unlock();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_barrier_create(
rtems_name name,
rtems_attribute attribute_set,
uint32_t maximum_waiters,
rtems_id *id
)
{
Barrier_Control *the_barrier;
CORE_barrier_Attributes the_attributes;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !id )
return RTEMS_INVALID_ADDRESS;
/* Initialize core barrier attributes */
if ( _Attributes_Is_barrier_automatic( attribute_set ) ) {
the_attributes.discipline = CORE_BARRIER_AUTOMATIC_RELEASE;
if ( maximum_waiters == 0 )
return RTEMS_INVALID_NUMBER;
} else
the_attributes.discipline = CORE_BARRIER_MANUAL_RELEASE;
the_attributes.maximum_count = maximum_waiters;
_Thread_Disable_dispatch(); /* prevents deletion */
the_barrier = _Barrier_Allocate();
if ( !the_barrier ) {
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
the_barrier->attribute_set = attribute_set;
_CORE_barrier_Initialize( &the_barrier->Barrier, &the_attributes );
_Objects_Open(
&_Barrier_Information,
&the_barrier->Object,
(Objects_Name) name
);
*id = the_barrier->Object.id;
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_port_create(
rtems_name name,
void *internal_start,
void *external_start,
uint32_t length,
rtems_id *id
)
{
register Dual_ported_memory_Control *the_port;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !id )
return RTEMS_INVALID_ADDRESS;
if ( !_Addresses_Is_aligned( internal_start ) ||
!_Addresses_Is_aligned( external_start ) )
return RTEMS_INVALID_ADDRESS;
_Thread_Disable_dispatch(); /* to prevent deletion */
the_port = _Dual_ported_memory_Allocate();
if ( !the_port ) {
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
the_port->internal_base = internal_start;
the_port->external_base = external_start;
the_port->length = length - 1;
_Objects_Open(
&_Dual_ported_memory_Information,
&the_port->Object,
(Objects_Name) name
);
*id = the_port->Object.id;
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_rate_monotonic_create(
rtems_name name,
rtems_id *id
)
{
Rate_monotonic_Control *the_period;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !id )
return RTEMS_INVALID_ADDRESS;
the_period = _Rate_monotonic_Allocate();
if ( !the_period ) {
_Objects_Allocator_unlock();
return RTEMS_TOO_MANY;
}
_ISR_lock_Initialize( &the_period->Lock, "Rate Monotonic Period" );
_Priority_Node_initialize( &the_period->Priority, 0 );
_Priority_Node_set_inactive( &the_period->Priority );
the_period->owner = _Thread_Get_executing();
the_period->state = RATE_MONOTONIC_INACTIVE;
_Watchdog_Preinitialize( &the_period->Timer, _Per_CPU_Get_by_index( 0 ) );
_Watchdog_Initialize( &the_period->Timer, _Rate_monotonic_Timeout );
_Rate_monotonic_Reset_statistics( the_period );
_Objects_Open(
&_Rate_monotonic_Information,
&the_period->Object,
(Objects_Name) name
);
*id = the_period->Object.id;
_Objects_Allocator_unlock();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_rate_monotonic_create(
rtems_name name,
rtems_id *id
)
{
Rate_monotonic_Control *the_period;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !id )
return RTEMS_INVALID_ADDRESS;
_Thread_Disable_dispatch(); /* to prevent deletion */
the_period = _Rate_monotonic_Allocate();
if ( !the_period ) {
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
the_period->owner = _Thread_Executing;
the_period->state = RATE_MONOTONIC_INACTIVE;
_Watchdog_Initialize( &the_period->Timer, NULL, 0, NULL );
_Rate_monotonic_Reset_statistics( the_period );
_Objects_Open(
&_Rate_monotonic_Information,
&the_period->Object,
(Objects_Name) name
);
*id = the_period->Object.id;
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_partition_create(
rtems_name name,
void *starting_address,
uint32_t length,
uint32_t buffer_size,
rtems_attribute attribute_set,
rtems_id *id
)
{
register Partition_Control *the_partition;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !starting_address )
return RTEMS_INVALID_ADDRESS;
if ( !id )
return RTEMS_INVALID_ADDRESS;
if ( length == 0 || buffer_size == 0 || length < buffer_size ||
!_Partition_Is_buffer_size_aligned( buffer_size ) )
return RTEMS_INVALID_SIZE;
if ( !_Addresses_Is_aligned( starting_address ) )
return RTEMS_INVALID_ADDRESS;
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( attribute_set ) &&
!_System_state_Is_multiprocessing )
return RTEMS_MP_NOT_CONFIGURED;
#endif
_Thread_Disable_dispatch(); /* prevents deletion */
the_partition = _Partition_Allocate();
if ( !the_partition ) {
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( attribute_set ) &&
!( _Objects_MP_Allocate_and_open( &_Partition_Information, name,
the_partition->Object.id, false ) ) ) {
_Partition_Free( the_partition );
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
#endif
the_partition->starting_address = starting_address;
the_partition->length = length;
the_partition->buffer_size = buffer_size;
the_partition->attribute_set = attribute_set;
the_partition->number_of_used_blocks = 0;
_Chain_Initialize( &the_partition->Memory, starting_address,
length / buffer_size, buffer_size );
_Objects_Open(
&_Partition_Information,
&the_partition->Object,
(Objects_Name) name
);
*id = the_partition->Object.id;
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( attribute_set ) )
_Partition_MP_Send_process_packet(
PARTITION_MP_ANNOUNCE_CREATE,
the_partition->Object.id,
name,
0 /* Not used */
);
#endif
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_task_create(
rtems_name name,
rtems_task_priority initial_priority,
size_t stack_size,
rtems_mode initial_modes,
rtems_attribute attribute_set,
rtems_id *id
)
{
Thread_Control *the_thread;
bool is_fp;
#if defined(RTEMS_MULTIPROCESSING)
Objects_MP_Control *the_global_object = NULL;
bool is_global;
#endif
bool status;
rtems_attribute the_attribute_set;
Priority_Control core_priority;
RTEMS_API_Control *api;
ASR_Information *asr;
if ( !id )
return RTEMS_INVALID_ADDRESS;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
/*
* Core Thread Initialize insures we get the minimum amount of
* stack space.
*/
/*
* Fix the attribute set to match the attributes which
* this processor (1) requires and (2) is able to support.
* First add in the required flags for attribute_set
* Typically this might include FP if the platform
* or application required all tasks to be fp aware.
* Then turn off the requested bits which are not supported.
*/
the_attribute_set = _Attributes_Set( attribute_set, ATTRIBUTES_REQUIRED );
the_attribute_set =
_Attributes_Clear( the_attribute_set, ATTRIBUTES_NOT_SUPPORTED );
if ( _Attributes_Is_floating_point( the_attribute_set ) )
is_fp = true;
else
is_fp = false;
/*
* Validate the RTEMS API priority and convert it to the core priority range.
*/
if ( !_Attributes_Is_system_task( the_attribute_set ) ) {
if ( !_RTEMS_tasks_Priority_is_valid( initial_priority ) )
return RTEMS_INVALID_PRIORITY;
}
core_priority = _RTEMS_tasks_Priority_to_Core( initial_priority );
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( the_attribute_set ) ) {
is_global = true;
if ( !_System_state_Is_multiprocessing )
return RTEMS_MP_NOT_CONFIGURED;
} else
is_global = false;
#endif
/*
* Make sure system is MP if this task is global
*/
/*
* Allocate the thread control block and -- if the task is global --
* allocate a global object control block.
*
* NOTE: This routine does not use the combined allocate and open
* global object routine because this results in a lack of
* control over when memory is allocated and can be freed in
* the event of an error.
*/
the_thread = _RTEMS_tasks_Allocate();
if ( !the_thread ) {
_Objects_Allocator_unlock();
return RTEMS_TOO_MANY;
}
#if defined(RTEMS_MULTIPROCESSING)
if ( is_global ) {
the_global_object = _Objects_MP_Allocate_global_object();
if ( _Objects_MP_Is_null_global_object( the_global_object ) ) {
_RTEMS_tasks_Free( the_thread );
_Objects_Allocator_unlock();
return RTEMS_TOO_MANY;
}
}
#endif
/*
* Initialize the core thread for this task.
*/
status = _Thread_Initialize(
&_RTEMS_tasks_Information,
the_thread,
_Scheduler_Get_by_CPU_index( _SMP_Get_current_processor() ),
NULL,
stack_size,
is_fp,
core_priority,
_Modes_Is_preempt(initial_modes) ? true : false,
_Modes_Is_timeslice(initial_modes) ?
THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE :
THREAD_CPU_BUDGET_ALGORITHM_NONE,
NULL, /* no budget algorithm callout */
_Modes_Get_interrupt_level(initial_modes),
(Objects_Name) name
);
if ( !status ) {
#if defined(RTEMS_MULTIPROCESSING)
if ( is_global )
_Objects_MP_Free_global_object( the_global_object );
#endif
_RTEMS_tasks_Free( the_thread );
_Objects_Allocator_unlock();
return RTEMS_UNSATISFIED;
}
api = the_thread->API_Extensions[ THREAD_API_RTEMS ];
asr = &api->Signal;
asr->is_enabled = _Modes_Is_asr_disabled(initial_modes) ? false : true;
*id = the_thread->Object.id;
#if defined(RTEMS_MULTIPROCESSING)
the_thread->is_global = is_global;
if ( is_global ) {
_Objects_MP_Open(
&_RTEMS_tasks_Information.Objects,
the_global_object,
name,
the_thread->Object.id
);
_RTEMS_tasks_MP_Send_process_packet(
RTEMS_TASKS_MP_ANNOUNCE_CREATE,
the_thread->Object.id,
name
);
}
#endif
_Objects_Allocator_unlock();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_region_create(
rtems_name name,
void *starting_address,
uintptr_t length,
uintptr_t page_size,
rtems_attribute attribute_set,
rtems_id *id
)
{
rtems_status_code return_status;
Region_Control *the_region;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !starting_address )
return RTEMS_INVALID_ADDRESS;
if ( !id )
return RTEMS_INVALID_ADDRESS;
_RTEMS_Lock_allocator(); /* to prevent deletion */
the_region = _Region_Allocate();
if ( !the_region )
return_status = RTEMS_TOO_MANY;
else {
the_region->maximum_segment_size = _Heap_Initialize(
&the_region->Memory, starting_address, length, page_size
);
if ( !the_region->maximum_segment_size ) {
_Region_Free( the_region );
return_status = RTEMS_INVALID_SIZE;
}
else {
the_region->starting_address = starting_address;
the_region->length = length;
the_region->page_size = page_size;
the_region->attribute_set = attribute_set;
the_region->number_of_used_blocks = 0;
_Thread_queue_Initialize(
&the_region->Wait_queue,
_Attributes_Is_priority( attribute_set ) ?
THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO,
STATES_WAITING_FOR_SEGMENT,
RTEMS_TIMEOUT
);
_Objects_Open(
&_Region_Information,
&the_region->Object,
(Objects_Name) name
);
*id = the_region->Object.id;
return_status = RTEMS_SUCCESSFUL;
}
}
_RTEMS_Unlock_allocator();
return return_status;
}
rtems_status_code rtems_semaphore_create(
rtems_name name,
uint32_t count,
rtems_attribute attribute_set,
rtems_task_priority priority_ceiling,
rtems_id *id
)
{
register Semaphore_Control *the_semaphore;
CORE_mutex_Attributes the_mutex_attr;
CORE_semaphore_Attributes the_semaphore_attr;
CORE_mutex_Status mutex_status;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !id )
return RTEMS_INVALID_ADDRESS;
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( attribute_set ) ) {
if ( !_System_state_Is_multiprocessing )
return RTEMS_MP_NOT_CONFIGURED;
if ( _Attributes_Is_inherit_priority( attribute_set ) ||
_Attributes_Is_priority_ceiling( attribute_set ) )
return RTEMS_NOT_DEFINED;
} else
#endif
if ( _Attributes_Is_inherit_priority( attribute_set ) ||
_Attributes_Is_priority_ceiling( attribute_set ) ) {
if ( ! (_Attributes_Is_binary_semaphore( attribute_set ) &&
_Attributes_Is_priority( attribute_set ) ) )
return RTEMS_NOT_DEFINED;
}
if ( _Attributes_Is_inherit_priority( attribute_set ) &&
_Attributes_Is_priority_ceiling( attribute_set ) )
return RTEMS_NOT_DEFINED;
if ( !_Attributes_Is_counting_semaphore( attribute_set ) && ( count > 1 ) )
return RTEMS_INVALID_NUMBER;
_Thread_Disable_dispatch(); /* prevents deletion */
the_semaphore = _Semaphore_Allocate();
if ( !the_semaphore ) {
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( attribute_set ) &&
! ( _Objects_MP_Allocate_and_open( &_Semaphore_Information, name,
the_semaphore->Object.id, false ) ) ) {
_Semaphore_Free( the_semaphore );
_Thread_Enable_dispatch();
return RTEMS_TOO_MANY;
}
#endif
the_semaphore->attribute_set = attribute_set;
/*
* Initialize it as a counting semaphore.
*/
if ( _Attributes_Is_counting_semaphore( attribute_set ) ) {
/*
* This effectively disables limit checking.
*/
the_semaphore_attr.maximum_count = 0xFFFFFFFF;
if ( _Attributes_Is_priority( attribute_set ) )
the_semaphore_attr.discipline = CORE_SEMAPHORE_DISCIPLINES_PRIORITY;
else
the_semaphore_attr.discipline = CORE_SEMAPHORE_DISCIPLINES_FIFO;
/*
* The following are just to make Purify happy.
*/
the_mutex_attr.lock_nesting_behavior = CORE_MUTEX_NESTING_ACQUIRES;
the_mutex_attr.priority_ceiling = PRIORITY_MINIMUM;
_CORE_semaphore_Initialize(
&the_semaphore->Core_control.semaphore,
&the_semaphore_attr,
count
);
} else {
/*
* It is either simple binary semaphore or a more powerful mutex
* style binary semaphore. This is the mutex style.
*/
if ( _Attributes_Is_priority( attribute_set ) )
the_mutex_attr.discipline = CORE_MUTEX_DISCIPLINES_PRIORITY;
else
the_mutex_attr.discipline = CORE_MUTEX_DISCIPLINES_FIFO;
if ( _Attributes_Is_binary_semaphore( attribute_set ) ) {
the_mutex_attr.priority_ceiling = priority_ceiling;
the_mutex_attr.lock_nesting_behavior = CORE_MUTEX_NESTING_ACQUIRES;
the_mutex_attr.only_owner_release = false;
if ( the_mutex_attr.discipline == CORE_MUTEX_DISCIPLINES_PRIORITY ) {
if ( _Attributes_Is_inherit_priority( attribute_set ) ) {
the_mutex_attr.discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT;
the_mutex_attr.only_owner_release = true;
} else if ( _Attributes_Is_priority_ceiling( attribute_set ) ) {
the_mutex_attr.discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING;
the_mutex_attr.only_owner_release = true;
}
}
} else /* must be simple binary semaphore */ {
the_mutex_attr.lock_nesting_behavior = CORE_MUTEX_NESTING_BLOCKS;
the_mutex_attr.only_owner_release = false;
}
mutex_status = _CORE_mutex_Initialize(
&the_semaphore->Core_control.mutex,
&the_mutex_attr,
(count == 1) ? CORE_MUTEX_UNLOCKED : CORE_MUTEX_LOCKED
);
if ( mutex_status == CORE_MUTEX_STATUS_CEILING_VIOLATED ) {
_Semaphore_Free( the_semaphore );
_Thread_Enable_dispatch();
return RTEMS_INVALID_PRIORITY;
}
}
/*
* Whether we initialized it as a mutex or counting semaphore, it is
* now ready to be "offered" for use as a Classic API Semaphore.
*/
_Objects_Open(
&_Semaphore_Information,
&the_semaphore->Object,
(Objects_Name) name
);
*id = the_semaphore->Object.id;
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( attribute_set ) )
_Semaphore_MP_Send_process_packet(
SEMAPHORE_MP_ANNOUNCE_CREATE,
the_semaphore->Object.id,
name,
0 /* Not used */
);
#endif
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_semaphore_create(
rtems_name name,
uint32_t count,
rtems_attribute attribute_set,
rtems_task_priority priority_ceiling,
rtems_id *id
)
{
Semaphore_Control *the_semaphore;
CORE_mutex_Attributes the_mutex_attr;
CORE_semaphore_Attributes the_semaphore_attr;
CORE_mutex_Status mutex_status;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !id )
return RTEMS_INVALID_ADDRESS;
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( attribute_set ) ) {
if ( !_System_state_Is_multiprocessing )
return RTEMS_MP_NOT_CONFIGURED;
if ( _Attributes_Is_inherit_priority( attribute_set ) ||
_Attributes_Is_priority_ceiling( attribute_set ) ||
_Attributes_Is_multiprocessor_resource_sharing( attribute_set ) )
return RTEMS_NOT_DEFINED;
} else
#endif
if ( _Attributes_Is_multiprocessor_resource_sharing( attribute_set ) &&
!( _Attributes_Is_binary_semaphore( attribute_set ) &&
!_Attributes_Is_priority( attribute_set ) ) ) {
return RTEMS_NOT_DEFINED;
}
if ( _Attributes_Is_inherit_priority( attribute_set ) ||
_Attributes_Is_priority_ceiling( attribute_set ) ) {
if ( ! (_Attributes_Is_binary_semaphore( attribute_set ) &&
_Attributes_Is_priority( attribute_set ) ) )
return RTEMS_NOT_DEFINED;
}
if ( !_Attributes_Has_at_most_one_protocol( attribute_set ) )
return RTEMS_NOT_DEFINED;
if ( !_Attributes_Is_counting_semaphore( attribute_set ) && ( count > 1 ) )
return RTEMS_INVALID_NUMBER;
#if !defined(RTEMS_SMP)
/*
* On uni-processor configurations the Multiprocessor Resource Sharing
* Protocol is equivalent to the Priority Ceiling Protocol.
*/
if ( _Attributes_Is_multiprocessor_resource_sharing( attribute_set ) ) {
attribute_set |= RTEMS_PRIORITY_CEILING | RTEMS_PRIORITY;
}
#endif
the_semaphore = _Semaphore_Allocate();
if ( !the_semaphore ) {
_Objects_Allocator_unlock();
return RTEMS_TOO_MANY;
}
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( attribute_set ) &&
! ( _Objects_MP_Allocate_and_open( &_Semaphore_Information, name,
the_semaphore->Object.id, false ) ) ) {
_Semaphore_Free( the_semaphore );
_Objects_Allocator_unlock();
return RTEMS_TOO_MANY;
}
#endif
the_semaphore->attribute_set = attribute_set;
/*
* Initialize it as a counting semaphore.
*/
if ( _Attributes_Is_counting_semaphore( attribute_set ) ) {
/*
* This effectively disables limit checking.
*/
the_semaphore_attr.maximum_count = 0xFFFFFFFF;
if ( _Attributes_Is_priority( attribute_set ) )
the_semaphore_attr.discipline = CORE_SEMAPHORE_DISCIPLINES_PRIORITY;
else
the_semaphore_attr.discipline = CORE_SEMAPHORE_DISCIPLINES_FIFO;
/*
* The following are just to make Purify happy.
*/
the_mutex_attr.lock_nesting_behavior = CORE_MUTEX_NESTING_ACQUIRES;
the_mutex_attr.priority_ceiling = PRIORITY_MINIMUM;
_CORE_semaphore_Initialize(
&the_semaphore->Core_control.semaphore,
&the_semaphore_attr,
count
);
#if defined(RTEMS_SMP)
} else if ( _Attributes_Is_multiprocessor_resource_sharing( attribute_set ) ) {
MRSP_Status mrsp_status = _MRSP_Initialize(
&the_semaphore->Core_control.mrsp,
priority_ceiling,
_Thread_Get_executing(),
count != 1
);
if ( mrsp_status != MRSP_SUCCESSFUL ) {
_Semaphore_Free( the_semaphore );
_Objects_Allocator_unlock();
return _Semaphore_Translate_MRSP_status_code( mrsp_status );
}
#endif
} else {
/*
* It is either simple binary semaphore or a more powerful mutex
* style binary semaphore. This is the mutex style.
*/
if ( _Attributes_Is_priority( attribute_set ) )
the_mutex_attr.discipline = CORE_MUTEX_DISCIPLINES_PRIORITY;
else
the_mutex_attr.discipline = CORE_MUTEX_DISCIPLINES_FIFO;
if ( _Attributes_Is_binary_semaphore( attribute_set ) ) {
the_mutex_attr.priority_ceiling = _RTEMS_tasks_Priority_to_Core(
priority_ceiling
);
the_mutex_attr.lock_nesting_behavior = CORE_MUTEX_NESTING_ACQUIRES;
the_mutex_attr.only_owner_release = false;
if ( the_mutex_attr.discipline == CORE_MUTEX_DISCIPLINES_PRIORITY ) {
if ( _Attributes_Is_inherit_priority( attribute_set ) ) {
the_mutex_attr.discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT;
the_mutex_attr.only_owner_release = true;
} else if ( _Attributes_Is_priority_ceiling( attribute_set ) ) {
the_mutex_attr.discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING;
the_mutex_attr.only_owner_release = true;
}
}
} else /* must be simple binary semaphore */ {
the_mutex_attr.lock_nesting_behavior = CORE_MUTEX_NESTING_BLOCKS;
the_mutex_attr.only_owner_release = false;
}
mutex_status = _CORE_mutex_Initialize(
&the_semaphore->Core_control.mutex,
_Thread_Get_executing(),
&the_mutex_attr,
count != 1
);
if ( mutex_status == CORE_MUTEX_STATUS_CEILING_VIOLATED ) {
_Semaphore_Free( the_semaphore );
_Objects_Allocator_unlock();
return RTEMS_INVALID_PRIORITY;
}
}
/*
* Whether we initialized it as a mutex or counting semaphore, it is
* now ready to be "offered" for use as a Classic API Semaphore.
*/
_Objects_Open(
&_Semaphore_Information,
&the_semaphore->Object,
(Objects_Name) name
);
*id = the_semaphore->Object.id;
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( attribute_set ) )
_Semaphore_MP_Send_process_packet(
SEMAPHORE_MP_ANNOUNCE_CREATE,
the_semaphore->Object.id,
name,
0 /* Not used */
);
#endif
_Objects_Allocator_unlock();
return RTEMS_SUCCESSFUL;
}