diff options
Diffstat (limited to 'nptl/pthread_mutex_setprioceiling.c')
-rw-r--r-- | nptl/pthread_mutex_setprioceiling.c | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/nptl/pthread_mutex_setprioceiling.c b/nptl/pthread_mutex_setprioceiling.c deleted file mode 100644 index 18b0763ba1..0000000000 --- a/nptl/pthread_mutex_setprioceiling.c +++ /dev/null @@ -1,121 +0,0 @@ -/* Set current priority ceiling of pthread_mutex_t. - Copyright (C) 2006-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Jakub Jelinek <jakub@redhat.com>, 2006. - - 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 <stdbool.h> -#include <errno.h> -#include <pthreadP.h> -#include <atomic.h> - - -int -pthread_mutex_setprioceiling (pthread_mutex_t *mutex, int prioceiling, - int *old_ceiling) -{ - /* The low bits of __kind aren't ever changed after pthread_mutex_init, - so we don't need a lock yet. */ - if ((mutex->__data.__kind & PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0) - return EINVAL; - - /* See __init_sched_fifo_prio. */ - if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1 - || atomic_load_relaxed (&__sched_fifo_max_prio) == -1) - __init_sched_fifo_prio (); - - if (__glibc_unlikely (prioceiling - < atomic_load_relaxed (&__sched_fifo_min_prio)) - || __glibc_unlikely (prioceiling - > atomic_load_relaxed (&__sched_fifo_max_prio)) - || __glibc_unlikely ((prioceiling - & (PTHREAD_MUTEXATTR_PRIO_CEILING_MASK - >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT)) - != prioceiling)) - return EINVAL; - - /* Check whether we already hold the mutex. */ - bool locked = false; - int kind = PTHREAD_MUTEX_TYPE (mutex); - if (mutex->__data.__owner == THREAD_GETMEM (THREAD_SELF, tid)) - { - if (kind == PTHREAD_MUTEX_PP_ERRORCHECK_NP) - return EDEADLK; - - if (kind == PTHREAD_MUTEX_PP_RECURSIVE_NP) - locked = true; - } - - int oldval = mutex->__data.__lock; - if (! locked) - do - { - /* Need to lock the mutex, but without obeying the priority - protect protocol. */ - int ceilval = (oldval & PTHREAD_MUTEX_PRIO_CEILING_MASK); - - oldval = atomic_compare_and_exchange_val_acq (&mutex->__data.__lock, - ceilval | 1, ceilval); - if (oldval == ceilval) - break; - - do - { - oldval - = atomic_compare_and_exchange_val_acq (&mutex->__data.__lock, - ceilval | 2, - ceilval | 1); - - if ((oldval & PTHREAD_MUTEX_PRIO_CEILING_MASK) != ceilval) - break; - - if (oldval != ceilval) - lll_futex_wait (&mutex->__data.__lock, ceilval | 2, - PTHREAD_MUTEX_PSHARED (mutex)); - } - while (atomic_compare_and_exchange_val_acq (&mutex->__data.__lock, - ceilval | 2, ceilval) - != ceilval); - - if ((oldval & PTHREAD_MUTEX_PRIO_CEILING_MASK) != ceilval) - continue; - } - while (0); - - int oldprio = (oldval & PTHREAD_MUTEX_PRIO_CEILING_MASK) - >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT; - if (locked) - { - int ret = __pthread_tpp_change_priority (oldprio, prioceiling); - if (ret) - return ret; - } - - if (old_ceiling != NULL) - *old_ceiling = oldprio; - - int newlock = 0; - if (locked) - newlock = (mutex->__data.__lock & ~PTHREAD_MUTEX_PRIO_CEILING_MASK); - mutex->__data.__lock = newlock - | (prioceiling << PTHREAD_MUTEX_PRIO_CEILING_SHIFT); - atomic_full_barrier (); - - lll_futex_wake (&mutex->__data.__lock, INT_MAX, - PTHREAD_MUTEX_PSHARED (mutex)); - - return 0; -} |