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glibc/nptl/pthread_getschedparam.c
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/* Copyright (C) 2002-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
The GNU C 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 2.1 of the License, or (at your option) any later version. | |
The GNU C 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 the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <string.h> | |
#include "pthreadP.h" | |
#include <lowlevellock.h> | |
int | |
__pthread_getschedparam (pthread_t threadid, int *policy, | |
struct sched_param *param) | |
{ | |
struct pthread *pd = (struct pthread *) threadid; | |
/* Make sure the descriptor is valid. */ | |
if (INVALID_TD_P (pd)) | |
/* Not a valid thread handle. */ | |
return ESRCH; | |
int result = 0; | |
lll_lock (pd->lock, LLL_PRIVATE); | |
/* The library is responsible for maintaining the values at all | |
times. If the user uses an interface other than | |
pthread_setschedparam to modify the scheduler setting it is not | |
the library's problem. In case the descriptor's values have | |
not yet been retrieved do it now. */ | |
if ((pd->flags & ATTR_FLAG_SCHED_SET) == 0) | |
{ | |
if (__sched_getparam (pd->tid, &pd->schedparam) != 0) | |
result = 1; | |
else | |
pd->flags |= ATTR_FLAG_SCHED_SET; | |
} | |
if ((pd->flags & ATTR_FLAG_POLICY_SET) == 0) | |
{ | |
pd->schedpolicy = __sched_getscheduler (pd->tid); | |
if (pd->schedpolicy == -1) | |
result = 1; | |
else | |
pd->flags |= ATTR_FLAG_POLICY_SET; | |
} | |
if (result == 0) | |
{ | |
*policy = pd->schedpolicy; | |
memcpy (param, &pd->schedparam, sizeof (struct sched_param)); | |
} | |
lll_unlock (pd->lock, LLL_PRIVATE); | |
return result; | |
} | |
strong_alias (__pthread_getschedparam, pthread_getschedparam) |