diff options
Diffstat (limited to 'libc/nptl/pthread_setschedprio.c')
-rw-r--r-- | libc/nptl/pthread_setschedprio.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/libc/nptl/pthread_setschedprio.c b/libc/nptl/pthread_setschedprio.c new file mode 100644 index 000000000..4a71f6c7b --- /dev/null +++ b/libc/nptl/pthread_setschedprio.c @@ -0,0 +1,72 @@ +/* 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. */ + +#include <errno.h> +#include <sched.h> +#include <string.h> +#include <sched.h> +#include "pthreadP.h" +#include <lowlevellock.h> + + +int +pthread_setschedprio (threadid, prio) + pthread_t threadid; + int prio; +{ + 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; + struct sched_param param; + param.sched_priority = prio; + + /* 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); + + lll_lock (pd->lock); + + /* If the thread should have higher priority because of some + PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */ + if (__builtin_expect (pd->tpp != NULL, 0) && pd->tpp->priomax > prio) + param.sched_priority = pd->tpp->priomax; + + /* 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. */ + param.sched_priority = prio; + memcpy (&pd->schedparam, ¶m, sizeof (struct sched_param)); + pd->flags |= ATTR_FLAG_SCHED_SET; + } + + lll_unlock (pd->lock); + + pthread_cleanup_pop (0); + + return result; +} |