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author | Richard Henderson <rth@twiddle.net> | 2014-04-16 21:36:33 -0700 |
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committer | Richard Henderson <rth@twiddle.net> | 2014-04-16 21:36:33 -0700 |
commit | ddb04724ed0a743be62bc6a52ef17565b9d01f42 (patch) | |
tree | 9125c97534566457dfa7e3dc430243f9b67ce824 /sysdeps | |
parent | d77c0899db92dfc2bed535efb91cf9918478fd86 (diff) | |
download | glibc-ddb04724ed0a743be62bc6a52ef17565b9d01f42.zip glibc-ddb04724ed0a743be62bc6a52ef17565b9d01f42.tar.gz glibc-ddb04724ed0a743be62bc6a52ef17565b9d01f42.tar.bz2 |
alpha: Remove alpha-linux pthread_once.c
Diffstat (limited to 'sysdeps')
-rw-r--r-- | sysdeps/unix/sysv/linux/alpha/nptl/pthread_once.c | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/nptl/pthread_once.c b/sysdeps/unix/sysv/linux/alpha/nptl/pthread_once.c deleted file mode 100644 index ab4d547..0000000 --- a/sysdeps/unix/sysv/linux/alpha/nptl/pthread_once.c +++ /dev/null @@ -1,95 +0,0 @@ -/* Copyright (C) 2003-2014 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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 "pthreadP.h" -#include <lowlevellock.h> - - -unsigned long int __fork_generation attribute_hidden; - -static void -clear_once_control (void *arg) -{ - pthread_once_t *once_control = (pthread_once_t *) arg; - - *once_control = 0; - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); -} - -int -__pthread_once (pthread_once_t *once_control, void (*init_routine) (void)) -{ - for (;;) - { - int oldval; - int newval; - int tmp; - - /* Pseudo code: - newval = __fork_generation | 1; - oldval = *once_control; - if ((oldval & 2) == 0) - *once_control = newval; - Do this atomically. - */ - newval = __fork_generation | 1; - __asm __volatile ( - "1: ldl_l %0, %2\n" - " and %0, 2, %1\n" - " bne %1, 2f\n" - " mov %3, %1\n" - " stl_c %1, %2\n" - " beq %1, 1b\n" - "2: mb" - : "=&r" (oldval), "=&r" (tmp), "=m" (*once_control) - : "r" (newval), "m" (*once_control)); - - /* Check if the initializer has already been done. */ - if ((oldval & 2) != 0) - return 0; - - /* Check if another thread already runs the initializer. */ - if ((oldval & 1) == 0) - break; - - /* Check whether the initializer execution was interrupted by a fork. */ - if (oldval != newval) - break; - - /* Same generation, some other thread was faster. Wait. */ - lll_futex_wait (once_control, oldval, LLL_PRIVATE); - } - - /* This thread is the first here. Do the initialization. - Register a cleanup handler so that in case the thread gets - interrupted the initialization can be restarted. */ - pthread_cleanup_push (clear_once_control, once_control); - - init_routine (); - - pthread_cleanup_pop (0); - - /* Add one to *once_control to take the bottom 2 bits from 01 to 10. */ - atomic_increment (once_control); - - /* Wake up all other threads. */ - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); - - return 0; -} -weak_alias (__pthread_once, pthread_once) -hidden_def (__pthread_once) |