2009-02-09 21:15:56 +00:00
|
|
|
/*
|
|
|
|
|
* sched_get_priority_min.c
|
|
|
|
|
*
|
|
|
|
|
* Description:
|
|
|
|
|
* POSIX thread functions that deal with thread scheduling.
|
|
|
|
|
*
|
|
|
|
|
* --------------------------------------------------------------------------
|
|
|
|
|
*
|
|
|
|
|
* Pthreads-win32 - POSIX Threads Library for Win32
|
|
|
|
|
* Copyright(C) 1998 John E. Bossom
|
|
|
|
|
* Copyright(C) 1999,2005 Pthreads-win32 contributors
|
|
|
|
|
*
|
|
|
|
|
* Contact Email: rpj@callisto.canberra.edu.au
|
|
|
|
|
*
|
|
|
|
|
* The current list of contributors is contained
|
|
|
|
|
* in the file CONTRIBUTORS included with the source
|
|
|
|
|
* code distribution. The list can also be seen at the
|
|
|
|
|
* following World Wide Web location:
|
|
|
|
|
* http://sources.redhat.com/pthreads-win32/contributors.html
|
|
|
|
|
*
|
|
|
|
|
* This library is free software; you can redistribute it and/or
|
|
|
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
|
|
|
* License as published by the Free Software Foundation; either
|
|
|
|
|
* version 2 of the License, or (at your option) any later version.
|
|
|
|
|
*
|
|
|
|
|
* This library is distributed in the hope that it will be useful,
|
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
|
* Lesser General Public License for more details.
|
|
|
|
|
*
|
|
|
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
|
|
|
* License along with this library in the file COPYING.LIB;
|
|
|
|
|
* if not, write to the Free Software Foundation, Inc.,
|
|
|
|
|
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include "pthread.h"
|
|
|
|
|
#include "implement.h"
|
|
|
|
|
#include "sched.h"
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* On Windows98, THREAD_PRIORITY_LOWEST is (-2) and
|
|
|
|
|
* THREAD_PRIORITY_HIGHEST is 2, and everything works just fine.
|
|
|
|
|
*
|
|
|
|
|
* On WinCE 3.0, it so happen that THREAD_PRIORITY_LOWEST is 5
|
|
|
|
|
* and THREAD_PRIORITY_HIGHEST is 1 (yes, I know, it is funny:
|
|
|
|
|
* highest priority use smaller numbers) and the following happens:
|
|
|
|
|
*
|
|
|
|
|
* sched_get_priority_min() returns 5
|
|
|
|
|
* sched_get_priority_max() returns 1
|
|
|
|
|
*
|
|
|
|
|
* The following table shows the base priority levels for combinations
|
|
|
|
|
* of priority class and priority value in Win32.
|
|
|
|
|
*
|
|
|
|
|
* Process Priority Class Thread Priority Level
|
|
|
|
|
* -----------------------------------------------------------------
|
|
|
|
|
* 1 IDLE_PRIORITY_CLASS THREAD_PRIORITY_IDLE
|
|
|
|
|
* 1 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_IDLE
|
|
|
|
|
* 1 NORMAL_PRIORITY_CLASS THREAD_PRIORITY_IDLE
|
|
|
|
|
* 1 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_IDLE
|
|
|
|
|
* 1 HIGH_PRIORITY_CLASS THREAD_PRIORITY_IDLE
|
|
|
|
|
* 2 IDLE_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
|
|
|
|
|
* 3 IDLE_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
|
|
|
|
|
* 4 IDLE_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
|
|
|
|
|
* 4 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
|
|
|
|
|
* 5 IDLE_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
|
|
|
|
|
* 5 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
|
|
|
|
|
* 5 Background NORMAL_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
|
|
|
|
|
* 6 IDLE_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
|
|
|
|
|
* 6 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
|
|
|
|
|
* 6 Background NORMAL_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
|
|
|
|
|
* 7 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
|
|
|
|
|
* 7 Background NORMAL_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
|
|
|
|
|
* 7 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
|
|
|
|
|
* 8 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
|
|
|
|
|
* 8 NORMAL_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
|
|
|
|
|
* 8 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
|
|
|
|
|
* 8 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
|
|
|
|
|
* 9 NORMAL_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
|
|
|
|
|
* 9 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
|
|
|
|
|
* 9 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
|
|
|
|
|
* 10 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
|
|
|
|
|
* 10 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
|
|
|
|
|
* 11 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
|
|
|
|
|
* 11 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
|
|
|
|
|
* 11 HIGH_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
|
|
|
|
|
* 12 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
|
|
|
|
|
* 12 HIGH_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
|
|
|
|
|
* 13 HIGH_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
|
|
|
|
|
* 14 HIGH_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
|
|
|
|
|
* 15 HIGH_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
|
|
|
|
|
* 15 HIGH_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
|
|
|
|
|
* 15 IDLE_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
|
|
|
|
|
* 15 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
|
|
|
|
|
* 15 NORMAL_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
|
|
|
|
|
* 15 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
|
|
|
|
|
* 16 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_IDLE
|
|
|
|
|
* 17 REALTIME_PRIORITY_CLASS -7
|
|
|
|
|
* 18 REALTIME_PRIORITY_CLASS -6
|
|
|
|
|
* 19 REALTIME_PRIORITY_CLASS -5
|
|
|
|
|
* 20 REALTIME_PRIORITY_CLASS -4
|
|
|
|
|
* 21 REALTIME_PRIORITY_CLASS -3
|
|
|
|
|
* 22 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
|
|
|
|
|
* 23 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
|
|
|
|
|
* 24 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
|
|
|
|
|
* 25 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
|
|
|
|
|
* 26 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
|
|
|
|
|
* 27 REALTIME_PRIORITY_CLASS 3
|
|
|
|
|
* 28 REALTIME_PRIORITY_CLASS 4
|
|
|
|
|
* 29 REALTIME_PRIORITY_CLASS 5
|
|
|
|
|
* 30 REALTIME_PRIORITY_CLASS 6
|
|
|
|
|
* 31 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
|
|
|
|
|
*
|
|
|
|
|
* Windows NT: Values -7, -6, -5, -4, -3, 3, 4, 5, and 6 are not supported.
|
|
|
|
|
*
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
sched_get_priority_min (int policy)
|
|
|
|
|
{
|
|
|
|
|
if (policy < SCHED_MIN || policy > SCHED_MAX)
|
|
|
|
|
{
|
|
|
|
|
errno = EINVAL;
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
|
|
|
|
|
/* WinCE? */
|
|
|
|
|
return PTW32_MIN (THREAD_PRIORITY_IDLE, THREAD_PRIORITY_TIME_CRITICAL);
|
|
|
|
|
#else
|
|
|
|
|
/* This is independent of scheduling policy in Win32. */
|
|
|
|
|
return PTW32_MIN (THREAD_PRIORITY_IDLE, THREAD_PRIORITY_TIME_CRITICAL);
|
|
|
|
|
#endif
|
|
|
|
|
}
|
