diff options
Diffstat (limited to 'nptl/pthread_mutex_init.c')
| -rw-r--r-- | nptl/pthread_mutex_init.c | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/nptl/pthread_mutex_init.c b/nptl/pthread_mutex_init.c deleted file mode 100644 index 138e144155..0000000000 --- a/nptl/pthread_mutex_init.c +++ /dev/null @@ -1,148 +0,0 @@ -/* Copyright (C) 2002-2017 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 <assert.h> -#include <errno.h> -#include <stdbool.h> -#include <string.h> -#include <kernel-features.h> -#include "pthreadP.h" -#include <atomic.h> - -#include <stap-probe.h> - -static const struct pthread_mutexattr default_mutexattr = - { - /* Default is a normal mutex, not shared between processes. */ - .mutexkind = PTHREAD_MUTEX_NORMAL - }; - - -static bool -prio_inherit_missing (void) -{ -#ifdef __NR_futex - static int tpi_supported; - if (__glibc_unlikely (tpi_supported == 0)) - { - int lock = 0; - INTERNAL_SYSCALL_DECL (err); - int ret = INTERNAL_SYSCALL (futex, err, 4, &lock, FUTEX_UNLOCK_PI, 0, 0); - assert (INTERNAL_SYSCALL_ERROR_P (ret, err)); - tpi_supported = INTERNAL_SYSCALL_ERRNO (ret, err) == ENOSYS ? -1 : 1; - } - return __glibc_unlikely (tpi_supported < 0); -#endif - return true; -} - -int -__pthread_mutex_init (pthread_mutex_t *mutex, - const pthread_mutexattr_t *mutexattr) -{ - const struct pthread_mutexattr *imutexattr; - - assert (sizeof (pthread_mutex_t) <= __SIZEOF_PTHREAD_MUTEX_T); - - imutexattr = ((const struct pthread_mutexattr *) mutexattr - ?: &default_mutexattr); - - /* Sanity checks. */ - switch (__builtin_expect (imutexattr->mutexkind - & PTHREAD_MUTEXATTR_PROTOCOL_MASK, - PTHREAD_PRIO_NONE - << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT)) - { - case PTHREAD_PRIO_NONE << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT: - break; - - case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT: - if (__glibc_unlikely (prio_inherit_missing ())) - return ENOTSUP; - break; - - default: - /* XXX: For now we don't support robust priority protected mutexes. */ - if (imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST) - return ENOTSUP; - break; - } - - /* Clear the whole variable. */ - memset (mutex, '\0', __SIZEOF_PTHREAD_MUTEX_T); - - /* Copy the values from the attribute. */ - mutex->__data.__kind = imutexattr->mutexkind & ~PTHREAD_MUTEXATTR_FLAG_BITS; - - if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST) != 0) - { -#ifndef __ASSUME_SET_ROBUST_LIST - if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_PSHARED) != 0 - && __set_robust_list_avail < 0) - return ENOTSUP; -#endif - - mutex->__data.__kind |= PTHREAD_MUTEX_ROBUST_NORMAL_NP; - } - - switch (imutexattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK) - { - case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT: - mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_INHERIT_NP; - break; - - case PTHREAD_PRIO_PROTECT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT: - mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_PROTECT_NP; - - int ceiling = (imutexattr->mutexkind - & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK) - >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT; - if (! ceiling) - { - /* See __init_sched_fifo_prio. */ - if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1) - __init_sched_fifo_prio (); - if (ceiling < atomic_load_relaxed (&__sched_fifo_min_prio)) - ceiling = atomic_load_relaxed (&__sched_fifo_min_prio); - } - mutex->__data.__lock = ceiling << PTHREAD_MUTEX_PRIO_CEILING_SHIFT; - break; - - default: - break; - } - - /* The kernel when waking robust mutexes on exit never uses - FUTEX_PRIVATE_FLAG FUTEX_WAKE. */ - if ((imutexattr->mutexkind & (PTHREAD_MUTEXATTR_FLAG_PSHARED - | PTHREAD_MUTEXATTR_FLAG_ROBUST)) != 0) - mutex->__data.__kind |= PTHREAD_MUTEX_PSHARED_BIT; - - /* Default values: mutex not used yet. */ - // mutex->__count = 0; already done by memset - // mutex->__owner = 0; already done by memset - // mutex->__nusers = 0; already done by memset - // mutex->__spins = 0; already done by memset - // mutex->__next = NULL; already done by memset - - LIBC_PROBE (mutex_init, 1, mutex); - - return 0; -} -strong_alias (__pthread_mutex_init, pthread_mutex_init) -hidden_def (__pthread_mutex_init) |