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Implementation of pthread_setschedprio.
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Ulrich Drepper
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Nov 24, 2004
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/* Copyright (C) 2002, 2003, 2004 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, write to the Free | ||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | ||
02111-1307 USA. */ | ||
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#include <errno.h> | ||
#include <sched.h> | ||
#include <string.h> | ||
#include <sched.h> | ||
#include "pthreadP.h" | ||
#include <lowlevellock.h> | ||
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int | ||
pthread_setschedprio (threadid, prio) | ||
pthread_t threadid; | ||
int prio; | ||
{ | ||
struct pthread *pd = (struct pthread *) threadid; | ||
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/* Make sure the descriptor is valid. */ | ||
if (INVALID_TD_P (pd)) | ||
/* Not a valid thread handle. */ | ||
return ESRCH; | ||
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int result = 0; | ||
struct sched_param param; | ||
param.sched_priority = prio; | ||
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/* We have to handle cancellation in the following code since we are | ||
locking another threads desriptor. */ | ||
pthread_cleanup_push ((void (*) (void *)) lll_unlock_wake_cb, &pd->lock); | ||
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lll_lock (pd->lock); | ||
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/* Try to set the scheduler information. */ | ||
if (__builtin_expect (sched_setparam (pd->tid, ¶m) == -1, 0)) | ||
result = errno; | ||
else | ||
{ | ||
/* We succeeded changing the kernel information. Reflect this | ||
change in the thread descriptor. */ | ||
memcpy (&pd->schedparam, ¶m, sizeof (struct sched_param)); | ||
pd->flags |= ATTR_FLAG_SCHED_SET; | ||
} | ||
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lll_unlock (pd->lock); | ||
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pthread_cleanup_pop (0); | ||
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return result; | ||
} |