blob: b327514c0911aefd837592034401f0b673aa8b20 (
plain) (
tree)
|
|
/**
* @file
*
* @ingroup ClassicSMP
*
* @brief SMP Services API
*/
/*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _RTEMS_RTEMS_SMP_H
#define _RTEMS_RTEMS_SMP_H
#ifdef __cplusplus
extern "C" {
#endif
#include <rtems/score/smp.h>
/**
* @defgroup ClassicSMP SMP Services
*
* @ingroup ClassicRTEMS
*
* This encapsulates functionality which is useful for SMP applications.
*
* This API is also available on uni-processor configurations. Here compile
* time constants are used whenever possible.
*
* @{
*/
/**
* @brief Returns the count of processors in the system.
*
* On uni-processor configurations a value of one will be returned.
*
* On SMP configurations this returns the value of a global variable set during
* system initialization to indicate the count of processors. The processor
* count depends on the hardware and application configuration. The value will
* always be less than or equal to the maximum count of application configured
* processors.
*
* @return The count of processors in the system.
*/
uint32_t rtems_get_processor_count(void);
/**
* @brief Returns the index of the current processor.
*
* On uni-processor configurations this is a compile time constant and defined
* to be zero.
*
* On SMP configurations an architecture specific method is used to obtain the
* index of the current processor in the system. The set of processor indices
* is the range of integers starting with zero up to the processor count minus
* one.
*
* Outside of sections with disabled thread dispatching the current processor
* index may change after every instruction since the thread may migrate from
* one processor to another. Sections with disabled interrupts are sections
* with thread dispatching disabled.
*
* @return The index of the current processor.
*/
#define rtems_smp_get_current_processor() \
_SMP_Get_current_processor()
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
|
