84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
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/*
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* sched_setscheduler.c
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*
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* Description:
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* POSIX thread functions that deal with thread scheduling.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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#include "sched.h"
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int
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sched_setscheduler (pid_t pid, int policy)
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{
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/*
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* Win32 only has one policy which we call SCHED_OTHER.
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* However, we try to provide other valid side-effects
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* such as EPERM and ESRCH errors. Choosing to check
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* for a valid policy last allows us to get the most value out
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* of this function.
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*/
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if (0 != pid)
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{
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int selfPid = (int) GetCurrentProcessId ();
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if (pid != selfPid)
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{
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HANDLE h =
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OpenProcess (PROCESS_SET_INFORMATION, PTW32_FALSE, (DWORD) pid);
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if (NULL == h)
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{
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errno =
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(GetLastError () ==
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(0xFF & ERROR_ACCESS_DENIED)) ? EPERM : ESRCH;
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return -1;
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}
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else
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CloseHandle(h);
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}
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}
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if (SCHED_OTHER != policy)
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{
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errno = ENOSYS;
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return -1;
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}
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/*
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* Don't set anything because there is nothing to set.
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* Just return the current (the only possible) value.
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*/
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return SCHED_OTHER;
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}
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