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sched_get_priority_max.c
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/*
* sched_get_priority_max.c
*
* Description:
* POSIX thread functions that deal with thread scheduling.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads for Windows
* Copyright 1998 John E. Bossom
* Copyright 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* 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:
*
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#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)
{
__PTW32_SET_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
}