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authorRichard Henderson <rth@twiddle.net>2014-04-16 21:36:33 -0700
committerRichard Henderson <rth@twiddle.net>2014-04-16 21:36:33 -0700
commitddb04724ed0a743be62bc6a52ef17565b9d01f42 (patch)
tree9125c97534566457dfa7e3dc430243f9b67ce824 /sysdeps/unix
parentd77c0899db92dfc2bed535efb91cf9918478fd86 (diff)
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alpha: Remove alpha-linux pthread_once.c
Diffstat (limited to 'sysdeps/unix')
-rw-r--r--sysdeps/unix/sysv/linux/alpha/nptl/pthread_once.c95
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 ab4d54742b..0000000000
--- 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)