/* * 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 }