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sched_setscheduler.c    84 lines (77 with data), 2.5 kB

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/*
* sched_setscheduler.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"
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)
{
errno =
(GetLastError () ==
(0xFF & ERROR_ACCESS_DENIED)) ? EPERM : ESRCH;
return -1;
}
else
CloseHandle(h);
}
}
if (SCHED_OTHER != policy)
{
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;
}