| /* |
| * sched_get_priority_max.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_max (int policy) |
| { |
| if (policy < SCHED_MIN || policy > SCHED_MAX) |
| { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| #if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL) |
| /* WinCE? */ |
| return PTW32_MAX (THREAD_PRIORITY_IDLE, THREAD_PRIORITY_TIME_CRITICAL); |
| #else |
| /* This is independent of scheduling policy in Win32. */ |
| return PTW32_MAX (THREAD_PRIORITY_IDLE, THREAD_PRIORITY_TIME_CRITICAL); |
| #endif |
| } |
