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* init.c (__pthread_initialize_minimal_internal): Check for
FUTEX_CLOCK_REALTIME flag. * sysdeps/unix/sysv/linux/x86_64/lowlevellock.S (__lll_timedlock_wait): Use FUTEX_WAIT_BITSET|FUTEX_CLOCK_READTIME instead of computing relative timeout.
This commit is contained in:
Ulrich Drepper
parent
7dd650d7fc
commit
cbd8aeb836
@ -37,7 +37,7 @@ copy "iso14651_t1"
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END LC_COLLATE
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LC_CTYPE
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copy "i18n"
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copy "bn_IN"
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translit_start
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include "translit_combining";""
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@ -1,5 +1,11 @@
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2009-01-02 Ulrich Drepper <drepper@redhat.com>
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* init.c (__pthread_initialize_minimal_internal): Check for
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FUTEX_CLOCK_REALTIME flag.
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* sysdeps/unix/sysv/linux/x86_64/lowlevellock.S (__lll_timedlock_wait):
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Use FUTEX_WAIT_BITSET|FUTEX_CLOCK_READTIME instead of computing
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relative timeout.
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* sysdeps/unix/sysv/linux/x86_64/lowlevellock.h: Define
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FUTEX_CLOCK_REALTIME and FUTEX_BITSET_MATCH_ANY.
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* sysdeps/unix/sysv/linux/i386/lowlevellock.h: Likewise.
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26
nptl/init.c
26
nptl/init.c
@ -1,4 +1,4 @@
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/* Copyright (C) 2002,2003,2004,2005,2006,2007 Free Software Foundation, Inc.
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/* Copyright (C) 2002-2007, 2008, 2009 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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@ -18,6 +18,7 @@
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02111-1307 USA. */
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdlib.h>
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@ -49,6 +50,15 @@ int __set_robust_list_avail;
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# define set_robust_list_not_avail() do { } while (0)
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#endif
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#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
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/* Nonzero if we do not have FUTEX_CLOCK_REALTIME. */
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int __have_futex_clock_realtime;
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# define __set_futex_clock_realtime() \
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__have_futex_clock_realtime = 1
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#else
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#define __set_futex_clock_realtime() do { } while (0)
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#endif
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/* Version of the library, used in libthread_db to detect mismatches. */
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static const char nptl_version[] __attribute_used__ = VERSION;
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@ -292,6 +302,20 @@ __pthread_initialize_minimal_internal (void)
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}
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#endif
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#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
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{
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int word = 0;
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word = INTERNAL_SYSCALL (futex, err, 6, &word,
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FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME
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| FUTEX_PRIVATE_FLAG, 1, NULL, 0,
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FUTEX_BITSET_MATCH_ANY);
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if (!INTERNAL_SYSCALL_ERROR_P (word, err)
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|| (INTERNAL_SYSCALL_ERRNO (word, err) != ENOSYS
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&& INTERNAL_SYSCALL_ERRNO (word, err) != EINVAL))
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__set_futex_clock_realtime ();
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}
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#endif
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/* Set initial thread's stack block from 0 up to __libc_stack_end.
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It will be bigger than it actually is, but for unwind.c/pt-longjmp.c
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purposes this is good enough. */
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@ -1,4 +1,4 @@
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/* Copyright (C) 2002-2006, 2007 Free Software Foundation, Inc.
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/* Copyright (C) 2002-2006, 2007, 2009 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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@ -31,6 +31,8 @@
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movl $(FUTEX_WAKE | FUTEX_PRIVATE_FLAG), reg
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# define LOAD_FUTEX_WAIT(reg) \
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xorl $(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg
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# define LOAD_FUTEX_WAIT_ABS(reg) \
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xorl $(FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME), reg
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# define LOAD_FUTEX_WAKE(reg) \
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xorl $(FUTEX_WAKE | FUTEX_PRIVATE_FLAG), reg
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#else
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@ -55,6 +57,10 @@
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andl %fs:PRIVATE_FUTEX, reg ; \
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orl $FUTEX_WAIT, reg
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# endif
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# define LOAD_FUTEX_WAIT_ABS(reg) \
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xorl $FUTEX_PRIVATE_FLAG, reg ; \
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andl %fs:PRIVATE_FUTEX, reg ; \
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orl $FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME, reg
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# define LOAD_FUTEX_WAKE(reg) \
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xorl $FUTEX_PRIVATE_FLAG, reg ; \
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andl %fs:PRIVATE_FUTEX, reg ; \
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@ -143,12 +149,61 @@ __lll_lock_wait:
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cfi_endproc
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.size __lll_lock_wait,.-__lll_lock_wait
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/* %rdi: futex
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%rsi: flags
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%rdx: timeout
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%eax: futex value
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*/
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.globl __lll_timedlock_wait
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.type __lll_timedlock_wait,@function
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.hidden __lll_timedlock_wait
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.align 16
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__lll_timedlock_wait:
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cfi_startproc
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# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
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# ifdef PIC
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cmpl $0, __have_futex_clock_realtime(%rip)
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# else
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cmpl $0, __have_futex_clock_realtime
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# endif
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je .Lreltmo
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# endif
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pushq %r9
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cfi_adjust_cfa_offset(9)
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cfi_offset(%r9, -16)
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movq %rdx, %r10
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movl $0xffffffff, %r9d
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LOAD_FUTEX_WAIT_ABS (%esi)
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movl $2, %edx
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cmpl %edx, %eax
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jne 2f
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1: movl $SYS_futex, %eax
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movl $2, %edx
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syscall
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2: xchgl %edx, (%rdi) /* NB: lock is implied */
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testl %edx, %edx
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jz 3f
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cmpl $-ETIMEDOUT, %eax
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je 4f
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cmpl $-EINVAL, %eax
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jne 1b
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4: movl %eax, %edx
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negl %edx
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3: movl %edx, %eax
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popq %r9
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cfi_adjust_cfa_offset(-8)
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cfi_restore(%r9)
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retq
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# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
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.Lreltmo:
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/* Check for a valid timeout value. */
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cmpq $1000000000, 8(%rdx)
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jae 3f
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@ -253,6 +308,7 @@ __lll_timedlock_wait:
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3: movl $EINVAL, %eax
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retq
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# endif
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cfi_endproc
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.size __lll_timedlock_wait,.-__lll_timedlock_wait
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#endif
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