Multiprocessing Configuration

Macros
#define	CONFIGURE_EXTRA_MPCI_RECEIVE_SERVER_STACK
	This configuration option is an integer define.
#define	CONFIGURE_MP_APPLICATION
	This configuration option is a boolean feature define.
#define	CONFIGURE_MP_MAXIMUM_GLOBAL_OBJECTS
	This configuration option is an integer define.
#define	CONFIGURE_MP_MAXIMUM_NODES
	This configuration option is an integer define.
#define	CONFIGURE_MP_MAXIMUM_PROXIES
	This configuration option is an integer define.
#define	CONFIGURE_MP_MPCI_TABLE_POINTER
	This configuration option is an initializer define.
#define	CONFIGURE_MP_NODE_NUMBER
	This configuration option is an integer define.

Detailed Description

This section describes multiprocessing related configuration options. The options are only used if RTEMS was built when the multiprocessing build configuration option is enabled. The multiprocessing configuration is distinct from the SMP configuration. Additionally, this class of configuration options are only applicable if the configuration option CONFIGURE_MP_APPLICATION is defined. The multiprocessing (MPCI) support must not be confused with the SMP support.

Macro Definition Documentation

CONFIGURE_EXTRA_MPCI_RECEIVE_SERVER_STACK

#define CONFIGURE_EXTRA_MPCI_RECEIVE_SERVER_STACK

This configuration option is an integer define.

The value of this configuration option defines the number of bytes the applications wishes to add to the MPCI task stack on top of CONFIGURE_MINIMUM_TASK_STACK_SIZE.

Default Value

The default value is 0.

Constraints

The following constraints apply to this configuration option:

• The value of the configuration option shall be greater than or equal to zero.
• The value of the configuration option shall be less than or equal to UINT32_MAX.
• The value of the configuration option shall be small enough so that the MPCI receive server stack area calculation carried out by <rtems/confdefs.h> does not overflow an integer of type size_t.

Notes

This configuration option is only evaluated if CONFIGURE_MP_APPLICATION is defined.

CONFIGURE_MP_APPLICATION

#define CONFIGURE_MP_APPLICATION

This configuration option is a boolean feature define.

This configuration option is defined to indicate that the application intends to be part of a multiprocessing configuration. Additional configuration options are assumed to be provided.

Default Configuration

If this configuration option is undefined, then the multiprocessing services are not initialized.

Notes

This configuration option shall be undefined if the multiprocessing support is not enabled (e.g. RTEMS was built without the multiprocessing build configuration option enabled). Otherwise a compile time error in the configuration file will occur.

CONFIGURE_MP_MAXIMUM_GLOBAL_OBJECTS

#define CONFIGURE_MP_MAXIMUM_GLOBAL_OBJECTS

This configuration option is an integer define.

The value of this configuration option defines the maximum number of concurrently active global objects in a multiprocessor system.

Default Value

The default value is 32.

Constraints

The following constraints apply to this configuration option:

• The value of the configuration option shall be greater than or equal to zero.
• The value of the configuration option shall be less than or equal to UINT32_MAX.

Notes

This value corresponds to the total number of objects which can be created with the RTEMS_GLOBAL attribute.

This configuration option is only evaluated if CONFIGURE_MP_APPLICATION is defined.

CONFIGURE_MP_MAXIMUM_NODES

#define CONFIGURE_MP_MAXIMUM_NODES

This configuration option is an integer define.

The value of this configuration option defines the maximum number of nodes in a multiprocessor system.

Default Value

The default value is 2.

Constraints

The following constraints apply to this configuration option:

• The value of the configuration option shall be greater than or equal to zero.
• The value of the configuration option shall be less than or equal to UINT32_MAX.

Notes

This configuration option is only evaluated if CONFIGURE_MP_APPLICATION is defined.

CONFIGURE_MP_MAXIMUM_PROXIES

#define CONFIGURE_MP_MAXIMUM_PROXIES

This configuration option is an integer define.

The value of this configuration option defines the maximum number of concurrently active thread/task proxies on this node in a multiprocessor system.

Default Value

The default value is 32.

Constraints

The following constraints apply to this configuration option:

• The value of the configuration option shall be greater than or equal to zero.
• The value of the configuration option shall be less than or equal to UINT32_MAX.

Notes

Since a proxy is used to represent a remote task/thread which is blocking on this node. This configuration parameter reflects the maximum number of remote tasks/threads which can be blocked on objects on this node, see Proxies.

This configuration option is only evaluated if CONFIGURE_MP_APPLICATION is defined.

CONFIGURE_MP_MPCI_TABLE_POINTER

#define CONFIGURE_MP_MPCI_TABLE_POINTER

This configuration option is an initializer define.

The value of this configuration option initializes the MPCI Configuration Table.

Default Value

The default value is &MPCI_table.

Constraints

The value of the configuration option shall be a pointer to ::rtems_mpci_table.

Notes

RTEMS provides a Shared Memory MPCI Device Driver which can be used on any Multiprocessor System assuming the BSP provides the proper set of supporting methods.

This configuration option is only evaluated if CONFIGURE_MP_APPLICATION is defined.

CONFIGURE_MP_NODE_NUMBER

#define CONFIGURE_MP_NODE_NUMBER

This configuration option is an integer define.

The value of this configuration option defines the node number of this node in a multiprocessor system.

Default Value

The default value is NODE_NUMBER.

Constraints

The following constraints apply to this configuration option:

• The value of the configuration option shall be greater than or equal to zero.
• The value of the configuration option shall be less than or equal to UINT32_MAX.

Notes

In the RTEMS Multiprocessing Test Suite, the node number is derived from the Makefile variable NODE_NUMBER. The same code is compiled with the NODE_NUMBER set to different values. The test programs behave differently based upon their node number.

This configuration option is only evaluated if CONFIGURE_MP_APPLICATION is defined.