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/*
* sched_setscheduler.c
*
* Description:
* POSIX thread functions that deal with thread scheduling.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 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/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
#include "sched.h"
int
sched_setscheduler (pid_t pid, int policy)
{
/*
* Win32 only has one policy which we call SCHED_OTHER.
* However, we try to provide other valid side-effects
* such as EPERM and ESRCH errors. Choosing to check
* for a valid policy last allows us to get the most value out
* of this function.
*/
if (0 != pid)
{
int selfPid = (int) GetCurrentProcessId ();
if (pid != selfPid)
{
HANDLE h =
OpenProcess (PROCESS_SET_INFORMATION, PTW32_FALSE, (DWORD) pid);
if (NULL == h)
{
PTW32_SET_ERRNO((GetLastError () == (0xFF & ERROR_ACCESS_DENIED)) ? EPERM : ESRCH);
return -1;
}
else
CloseHandle(h);
}
}
if (SCHED_OTHER != policy)
{
PTW32_SET_ERRNO(ENOSYS);
return -1;
}
/*
* Don't set anything because there is nothing to set.
* Just return the current (the only possible) value.
*/
return SCHED_OTHER;
}
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