1 /* 2 * sched_setscheduler.c 3 * 4 * Description: 5 * POSIX thread functions that deal with thread scheduling. 6 * 7 * -------------------------------------------------------------------------- 8 * 9 * Pthreads-win32 - POSIX Threads Library for Win32 10 * Copyright(C) 1998 John E. Bossom 11 * Copyright(C) 1999,2005 Pthreads-win32 contributors 12 * 13 * Contact Email: rpj (at) callisto.canberra.edu.au 14 * 15 * The current list of contributors is contained 16 * in the file CONTRIBUTORS included with the source 17 * code distribution. The list can also be seen at the 18 * following World Wide Web location: 19 * http://sources.redhat.com/pthreads-win32/contributors.html 20 * 21 * This library is free software; you can redistribute it and/or 22 * modify it under the terms of the GNU Lesser General Public 23 * License as published by the Free Software Foundation; either 24 * version 2 of the License, or (at your option) any later version. 25 * 26 * This library is distributed in the hope that it will be useful, 27 * but WITHOUT ANY WARRANTY; without even the implied warranty of 28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 29 * Lesser General Public License for more details. 30 * 31 * You should have received a copy of the GNU Lesser General Public 32 * License along with this library in the file COPYING.LIB; 33 * if not, write to the Free Software Foundation, Inc., 34 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 35 */ 36 37 #include "pthread.h" 38 #include "implement.h" 39 #include "sched.h" 40 41 int 42 sched_setscheduler (pid_t pid, int policy) 43 { 44 /* 45 * Win32 only has one policy which we call SCHED_OTHER. 46 * However, we try to provide other valid side-effects 47 * such as EPERM and ESRCH errors. Choosing to check 48 * for a valid policy last allows us to get the most value out 49 * of this function. 50 */ 51 if (0 != pid) 52 { 53 int selfPid = (int) GetCurrentProcessId (); 54 55 if (pid != selfPid) 56 { 57 HANDLE h = 58 OpenProcess (PROCESS_SET_INFORMATION, PTW32_FALSE, (DWORD) pid); 59 60 if (NULL == h) 61 { 62 errno = 63 (GetLastError () == 64 (0xFF & ERROR_ACCESS_DENIED)) ? EPERM : ESRCH; 65 return -1; 66 } 67 else 68 CloseHandle(h); 69 } 70 } 71 72 if (SCHED_OTHER != policy) 73 { 74 errno = ENOSYS; 75 return -1; 76 } 77 78 /* 79 * Don't set anything because there is nothing to set. 80 * Just return the current (the only possible) value. 81 */ 82 return SCHED_OTHER; 83 } 84