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+/*
+ * 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
+}