priority.h

来自「RTEMS (Real-Time Executive for Multiproc」· C头文件 代码 · 共 45 行

/*
 *
 *
 *  $Id: priority.h,v 1.5 1997/04/15 18:02:12 joel Exp $
 */

#ifndef __RTEMS_POSIX_PRIORITY_h
#define __RTEMS_POSIX_PRIORITY_h

#include <rtems/score/priority.h>

/*
 *  1003.1b-1993,2.2.2.80 definition of priority, p. 19
 *
 *  "Numericallly higher values represent higher priorities."
 *
 *  Thus, RTEMS Core has priorities run in the opposite sense of the POSIX API.
 *
 *  There are only 254 posix priority levels since a task at priority level
 *  255 would never run because of the RTEMS idle task.  This is necessary
 *  because GNAT maps the lowest Ada task priority to the lowest thread
 *  priority.  The lowest priority Ada task should get to run, so there is
 *  a fundamental conflict with having 255 priorities.
 */

#define POSIX_SCHEDULER_MAXIMUM_PRIORITY (254)
  
#define POSIX_SCHEDULER_MINIMUM_PRIORITY (1)

RTEMS_INLINE_ROUTINE boolean _POSIX_Priority_Is_valid(
  int priority
);

RTEMS_INLINE_ROUTINE Priority_Control _POSIX_Priority_To_core(
  int priority
);

RTEMS_INLINE_ROUTINE int _POSIX_Priority_From_core(
  Priority_Control priority
);

#include <rtems/posix/priority.inl>

#endif