| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2002, 2003, 2004, 2007 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, write to the Free |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 18 | 02111-1307 USA. */ |
| 19 | |
| 20 | #include <errno.h> |
| 21 | #include <string.h> |
| 22 | #include "pthreadP.h" |
| 23 | #include <lowlevellock.h> |
| 24 | |
| 25 | |
| 26 | int |
| 27 | attribute_protected |
| 28 | __pthread_getschedparam ( |
| 29 | pthread_t threadid, |
| 30 | int *policy, |
| 31 | struct sched_param *param) |
| 32 | { |
| 33 | struct pthread *pd = (struct pthread *) threadid; |
| 34 | |
| 35 | /* Make sure the descriptor is valid. */ |
| 36 | if (INVALID_TD_P (pd)) |
| 37 | /* Not a valid thread handle. */ |
| 38 | return ESRCH; |
| 39 | |
| 40 | int result = 0; |
| 41 | |
| 42 | lll_lock (pd->lock, LLL_PRIVATE); |
| 43 | |
| 44 | /* The library is responsible for maintaining the values at all |
| 45 | times. If the user uses a interface other than |
| 46 | pthread_setschedparam to modify the scheduler setting it is not |
| 47 | the library's problem. In case the descriptor's values have |
| 48 | not yet been retrieved do it now. */ |
| 49 | if ((pd->flags & ATTR_FLAG_SCHED_SET) == 0) |
| 50 | { |
| 51 | if (sched_getparam (pd->tid, &pd->schedparam) != 0) |
| 52 | result = 1; |
| 53 | else |
| 54 | pd->flags |= ATTR_FLAG_SCHED_SET; |
| 55 | } |
| 56 | |
| 57 | if ((pd->flags & ATTR_FLAG_POLICY_SET) == 0) |
| 58 | { |
| 59 | pd->schedpolicy = sched_getscheduler (pd->tid); |
| 60 | if (pd->schedpolicy == -1) |
| 61 | result = 1; |
| 62 | else |
| 63 | pd->flags |= ATTR_FLAG_POLICY_SET; |
| 64 | } |
| 65 | |
| 66 | if (result == 0) |
| 67 | { |
| 68 | *policy = pd->schedpolicy; |
| 69 | memcpy (param, &pd->schedparam, sizeof (struct sched_param)); |
| 70 | } |
| 71 | |
| 72 | lll_unlock (pd->lock, LLL_PRIVATE); |
| 73 | |
| 74 | return result; |
| 75 | } |
| 76 | strong_alias (__pthread_getschedparam, pthread_getschedparam) |