1 /*
2 * sched_getscheduler.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@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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
35 */
36
37 #include "pthread.h"
38 #include "implement.h"
39 #include "sched.h"
40
41 int
sched_getscheduler(pid_t pid)42 sched_getscheduler (pid_t pid)
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.
48 */
49 if (0 != pid)
50 {
51 int selfPid = (int) GetCurrentProcessId ();
52
53 if (pid != selfPid)
54 {
55 HANDLE h =
56 OpenProcess (PROCESS_QUERY_INFORMATION, PTW32_FALSE, (DWORD) pid);
57
58 if (NULL == h)
59 {
60 errno =
61 (GetLastError () ==
62 (0xFF & ERROR_ACCESS_DENIED)) ? EPERM : ESRCH;
63 return -1;
64 }
65 else
66 CloseHandle(h);
67 }
68 }
69
70 return SCHED_OTHER;
71 }
72