5a8075b116
private futexes are available. * allocatestack.c (allocate_stack): Copy private_futex field from current thread into the new stack. * sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S: Use private futexes if they are available. * sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S: Likewise * sysdeps/unix/sysv/linux/x86_64/lowlevellock.S: Adjust so that change in libc-lowlevellock.S allow using private futexes. * sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/lowlevellock.h: Define FUTEX_PRIVATE_FLAG. * sysdeps/unix/sysv/linux/i386/lowlevellock.h: Likewise. * sysdeps/unix/sysv/linux/x86_64/pthread_once.S: Use private futexes if they are available. * sysdeps/unix/sysv/linux/i386/pthread_once.S: Likewise. * sysdeps/x86_64/tcb-offsets.sym: Add PRIVATE_FUTEX. * sysdeps/i386/tcb-offsets.sym: Likewise. * sysdeps/x86_64/tls.h (tcbhead_t): Add private_futex field. * sysdeps/i386/tls.h (tcbhead_t): Likewise.
46 lines
1.6 KiB
ArmAsm
46 lines
1.6 KiB
ArmAsm
/* Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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 <kernel-features.h>
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/* In libc.so we do not unconditionally use the lock prefix. Only if
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the application is using threads. */
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#ifndef UP
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# define LOCK \
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cmpl $0, %gs:MULTIPLE_THREADS_OFFSET; \
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je 0f; \
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lock; \
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0:
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#endif
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/* All locks in libc are private. Use the kernel feature if possible. */
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#define FUTEX_PRIVATE_FLAG 128
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#ifdef __ASSUME_PRIVATE_FUTEX
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# define FUTEX_WAIT (0 | FUTEX_PRIVATE_FLAG)
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# define FUTEX_WAKE (1 | FUTEX_PRIVATE_FLAG)
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#else
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# define LOAD_FUTEX_WAIT(reg) \
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movl %gs:PRIVATE_FUTEX, reg
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# define LOAD_FUTEX_WAKE(reg) \
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movl %gs:PRIVATE_FUTEX, reg ; \
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orl $FUTEX_WAKE, reg
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#endif
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#include "lowlevellock.S"
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