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lll_futex_wake not lll_private_futex_wake. * sysdeps/unix/sysv/linux/arm/bits/fcntl.h (O_CLOEXEC): Define. * sysdeps/unix/sysv/linux/arm/eabi/sysdep.h: Include <tls.h> * sysdeps/unix/sysv/linux/arm/nptl/lowlevellock.c (__lll_lock_wait_private, __lll_lock_wait): New. (__lll_timedlock_wait): Don't include in libc.so; Take private argument. Use atomic_compare_and_exchange_bool_acq. * sysdeps/unix/sysv/linux/arm/nptl/lowlevellock.h: Renamed all lll_mutex_* resp. lll_robust_mutex_* macros to lll_* resp. lll_robust_*. Renamed all LLL_MUTEX_LOCK_* macros to LLL_LOCK_*. Include <kernel-features.h>. (LLL_LOCK_INITIALIZER): Remove duplicate definition. (__lll_private_flag): Define. (lll_futex_timed_wait): Pass private flag to syscall. (lll_futex_wake): Likewise. (lll_private_futex_wait, lll_private_futex_timed_wait, lll_private_futex_wake): Remove. (lll_robust_dead, lll_futex_requeue): Take private arguments. (lll_futex_wake_unlock): Pass private flag to syscall. (__lll_robust_trylock): Convert to macro. (__lll_robust_lock_wait): Add private argument. (__lll_lock_wait_private, __lll_lock_wait): Declare. (__lll_lock): Convert to macro. Take private argument. (__lll_cond_lock): Likewise. (lll_lock, lll_cond_lock): Take private arguments. (__lll_robust_lock): Take private argument. (__lll_timedlock_wait, __lll_robust_timedlock_wait): Take private arguments. (__lll_timedlock, __lll_robust_timedlock): Convert to macros. Take private arguments. (lll_timedlock, lll_robust_timedlock): Take private arguments. (__lll_unlock, __lll_robust_unlock): Convert to macros. Take private arguments. (lll_unlock, lll_robust_unlock): Take private arguments. (__lll_mutex_unlock_force, lll_mutex_unlock_force, lll_lock_t, lll_trylock, lll_lock, lll_unlock, lll_islocked): Remove. (lll_wait_tid): Pass LLL_SHARED to lll_futex_wait. (__lll_cond_wait, __lll_cond_timedwait, __lll_cond_wake, __lll_cond_broadcast, lll_cond_wait, lll_cond_timedwait, lll_cond_wake, lll_cond_broadcast): Remove. * sysdeps/unix/sysv/linux/arm/nptl/pthread_once.c (clear_once_control, __pthread_once): Use lll_futex_wake not lll_private_futex_wake.
100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/* Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include "pthreadP.h"
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#include <lowlevellock.h>
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unsigned long int __fork_generation attribute_hidden;
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static void
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clear_once_control (void *arg)
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{
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pthread_once_t *once_control = (pthread_once_t *) arg;
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*once_control = 0;
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lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
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}
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int
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__pthread_once (pthread_once_t *once_control, void (*init_routine) (void))
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{
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for (;;)
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{
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int oldval;
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int newval;
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/* Pseudo code:
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newval = __fork_generation | 1;
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oldval = *once_control;
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if ((oldval & 2) == 0)
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*once_control = newval;
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Do this atomically.
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*/
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do
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{
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newval = __fork_generation | 1;
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oldval = *once_control;
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if (oldval & 2)
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break;
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} while (atomic_compare_and_exchange_val_acq (once_control, newval, oldval) != oldval);
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/* Check if the initializer has already been done. */
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if ((oldval & 2) != 0)
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return 0;
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/* Check if another thread already runs the initializer. */
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if ((oldval & 1) == 0)
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break;
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/* Check whether the initializer execution was interrupted by a fork. */
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if (oldval != newval)
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break;
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/* Same generation, some other thread was faster. Wait. */
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lll_futex_wait (once_control, oldval, LLL_PRIVATE);
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}
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/* This thread is the first here. Do the initialization.
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Register a cleanup handler so that in case the thread gets
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interrupted the initialization can be restarted. */
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pthread_cleanup_push (clear_once_control, once_control);
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init_routine ();
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pthread_cleanup_pop (0);
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/* Say that the initialisation is done. */
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*once_control = __fork_generation | 2;
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/* Wake up all other threads. */
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lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
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return 0;
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}
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weak_alias (__pthread_once, pthread_once)
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strong_alias (__pthread_once, __pthread_once_internal)
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#if defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__PIC__)
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/* When statically linked, if pthread_create is used, this file
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will be brought in. The exception handling code in GCC assumes
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that if pthread_create is available, so are these. */
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const void *include_pthread_getspecific attribute_hidden = pthread_getspecific;
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const void *include_pthread_setspecific attribute_hidden = pthread_setspecific;
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const void *include_pthread_key_create attribute_hidden = pthread_key_create;
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#endif
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