136 lines
6.2 KiB
C
136 lines
6.2 KiB
C
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/*
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* sched_get_priority_min.c
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*
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* Description:
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* POSIX thread functions that deal with thread scheduling.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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#include "sched.h"
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/*
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* On Windows98, THREAD_PRIORITY_LOWEST is (-2) and
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* THREAD_PRIORITY_HIGHEST is 2, and everything works just fine.
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*
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* On WinCE 3.0, it so happen that THREAD_PRIORITY_LOWEST is 5
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* and THREAD_PRIORITY_HIGHEST is 1 (yes, I know, it is funny:
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* highest priority use smaller numbers) and the following happens:
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*
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* sched_get_priority_min() returns 5
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* sched_get_priority_max() returns 1
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*
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* The following table shows the base priority levels for combinations
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* of priority class and priority value in Win32.
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*
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* Process Priority Class Thread Priority Level
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* -----------------------------------------------------------------
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* 1 IDLE_PRIORITY_CLASS THREAD_PRIORITY_IDLE
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* 1 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_IDLE
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* 1 NORMAL_PRIORITY_CLASS THREAD_PRIORITY_IDLE
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* 1 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_IDLE
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* 1 HIGH_PRIORITY_CLASS THREAD_PRIORITY_IDLE
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* 2 IDLE_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
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* 3 IDLE_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
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* 4 IDLE_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
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* 4 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
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* 5 IDLE_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
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* 5 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
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* 5 Background NORMAL_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
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* 6 IDLE_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
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* 6 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
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* 6 Background NORMAL_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
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* 7 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
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* 7 Background NORMAL_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
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* 7 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
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* 8 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
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* 8 NORMAL_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
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* 8 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
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* 8 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
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* 9 NORMAL_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
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* 9 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
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* 9 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
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* 10 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
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* 10 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
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* 11 Foreground NORMAL_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
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* 11 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
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* 11 HIGH_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
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* 12 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
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* 12 HIGH_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
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* 13 HIGH_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
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* 14 HIGH_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
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* 15 HIGH_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
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* 15 HIGH_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
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* 15 IDLE_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
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* 15 BELOW_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
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* 15 NORMAL_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
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* 15 ABOVE_NORMAL_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
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* 16 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_IDLE
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* 17 REALTIME_PRIORITY_CLASS -7
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* 18 REALTIME_PRIORITY_CLASS -6
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* 19 REALTIME_PRIORITY_CLASS -5
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* 20 REALTIME_PRIORITY_CLASS -4
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* 21 REALTIME_PRIORITY_CLASS -3
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* 22 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_LOWEST
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* 23 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_BELOW_NORMAL
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* 24 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_NORMAL
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* 25 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_ABOVE_NORMAL
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* 26 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_HIGHEST
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* 27 REALTIME_PRIORITY_CLASS 3
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* 28 REALTIME_PRIORITY_CLASS 4
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* 29 REALTIME_PRIORITY_CLASS 5
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* 30 REALTIME_PRIORITY_CLASS 6
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* 31 REALTIME_PRIORITY_CLASS THREAD_PRIORITY_TIME_CRITICAL
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*
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* Windows NT: Values -7, -6, -5, -4, -3, 3, 4, 5, and 6 are not supported.
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*
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*/
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int
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sched_get_priority_min (int policy)
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{
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if (policy < SCHED_MIN || policy > SCHED_MAX)
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{
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errno = EINVAL;
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return -1;
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}
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#if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
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/* WinCE? */
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return PTW32_MIN (THREAD_PRIORITY_IDLE, THREAD_PRIORITY_TIME_CRITICAL);
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#else
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/* This is independent of scheduling policy in Win32. */
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return PTW32_MIN (THREAD_PRIORITY_IDLE, THREAD_PRIORITY_TIME_CRITICAL);
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#endif
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}
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