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* init.c (__pthread_initialize_minimal_internal): Check whether
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.
This commit is contained in:
Ulrich Drepper
parent
6d59823c29
commit
5a8075b116
@ -1,3 +1,26 @@
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2007-05-23 Ulrich Drepper <drepper@redhat.com>
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* init.c (__pthread_initialize_minimal_internal): Check whether
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private futexes are available.
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* allocatestack.c (allocate_stack): Copy private_futex field from
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current thread into the new stack.
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* sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S: Use private
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futexes if they are available.
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* sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S: Likewise
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* sysdeps/unix/sysv/linux/x86_64/lowlevellock.S: Adjust so that change
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in libc-lowlevellock.S allow using private futexes.
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* sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S: Likewise.
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* sysdeps/unix/sysv/linux/x86_64/lowlevellock.h: Define
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FUTEX_PRIVATE_FLAG.
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* sysdeps/unix/sysv/linux/i386/lowlevellock.h: Likewise.
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* sysdeps/unix/sysv/linux/x86_64/pthread_once.S: Use private futexes
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if they are available.
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* sysdeps/unix/sysv/linux/i386/pthread_once.S: Likewise.
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* sysdeps/x86_64/tcb-offsets.sym: Add PRIVATE_FUTEX.
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* sysdeps/i386/tcb-offsets.sym: Likewise.
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* sysdeps/x86_64/tls.h (tcbhead_t): Add private_futex field.
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* sysdeps/i386/tls.h (tcbhead_t): Likewise.
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2007-05-21 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/pthread/pthread-functions.h (struct pthread_functions):
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@ -376,6 +376,12 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
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__pthread_multiple_threads = *__libc_multiple_threads_ptr = 1;
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#endif
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#ifndef __ASSUME_PRIVATE_FUTEX
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/* The thread must know when private futexes are supported. */
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pd->header.private_futex = THREAD_GETMEM (THREAD_SELF,
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header.private_futex);
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#endif
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#ifdef NEED_DL_SYSINFO
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/* Copy the sysinfo value from the parent. */
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THREAD_SYSINFO(pd) = THREAD_SELF_SYSINFO;
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@ -510,6 +516,12 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
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__pthread_multiple_threads = *__libc_multiple_threads_ptr = 1;
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#endif
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#ifndef __ASSUME_PRIVATE_FUTEX
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/* The thread must know when private futexes are supported. */
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pd->header.private_futex = THREAD_GETMEM (THREAD_SELF,
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header.private_futex);
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#endif
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#ifdef NEED_DL_SYSINFO
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/* Copy the sysinfo value from the parent. */
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THREAD_SYSINFO(pd) = THREAD_SELF_SYSINFO;
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12
nptl/init.c
12
nptl/init.c
@ -276,6 +276,18 @@ __pthread_initialize_minimal_internal (void)
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#endif
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set_robust_list_not_avail ();
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#ifndef __ASSUME_PRIVATE_FUTEX
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/* Private futexes are always used (at least internally) so that
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doing the test once this early is beneficial. */
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{
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int word;
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res = INTERNAL_SYSCALL (futex, err, 3, &word,
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FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1);
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if (!INTERNAL_SYSCALL_ERROR_P (res, err))
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THREAD_SETMEM (pd, header.private_futex, FUTEX_PRIVATE_FLAG);
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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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@ -12,3 +12,6 @@ CLEANUP offsetof (struct pthread, cleanup)
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CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev)
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MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
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POINTER_GUARD offsetof (tcbhead_t, pointer_guard)
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#ifndef __ASSUME_PRIVATE_FUTEX
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PRIVATE_FUTEX offsetof (tcbhead_t, private_futex)
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#endif
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@ -28,6 +28,7 @@
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# include <stdlib.h>
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# include <list.h>
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# include <sysdep.h>
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# include <kernel-features.h>
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/* Type for the dtv. */
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@ -53,6 +54,9 @@ typedef struct
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uintptr_t stack_guard;
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uintptr_t pointer_guard;
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int gscope_flag;
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#ifndef __ASSUME_PRIVATE_FUTEX
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int private_futex;
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#endif
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} tcbhead_t;
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# define TLS_MULTIPLE_THREADS_IN_TCB 1
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@ -1,4 +1,4 @@
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/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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/* 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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@ -17,6 +17,8 @@
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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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@ -27,4 +29,17 @@
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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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@ -1,4 +1,4 @@
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/* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
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/* Copyright (C) 2002, 2003, 2004, 2006, 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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@ -32,8 +32,22 @@
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#define SYS_gettimeofday __NR_gettimeofday
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#define SYS_futex 240
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#ifndef FUTEX_WAIT
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# define FUTEX_WAIT 0
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# define FUTEX_WAKE 1
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#endif
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#ifndef LOAD_FUTEX_WAIT
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# if FUTEX_WAIT == 0
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# define LOAD_FUTEX_WAIT(reg) \
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xorl reg, reg
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# else
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# define LOAD_FUTEX_WAIT(reg) \
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movl $FUTEX_WAIT, reg
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# endif
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# define LOAD_FUTEX_WAKE(reg) \
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movl $FUTEX_WAKE, reg
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#endif
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.globl __lll_mutex_lock_wait
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@ -55,7 +69,7 @@ __lll_mutex_lock_wait:
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movl $2, %edx
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movl %ecx, %ebx
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xorl %esi, %esi /* No timeout. */
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xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
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LOAD_FUTEX_WAIT (%ecx)
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cmpl %edx, %eax /* NB: %edx == 2 */
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jne 2f
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@ -151,7 +165,7 @@ __lll_mutex_timedlock_wait:
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/* Futex call. */
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movl %esp, %esi
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xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
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LOAD_FUTEX_WAIT (%ecx)
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movl $SYS_futex, %eax
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ENTER_KERNEL
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movl %eax, %ecx
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@ -252,7 +266,7 @@ __lll_mutex_unlock_wake:
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movl %eax, %ebx
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movl $0, (%eax)
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movl $FUTEX_WAKE, %ecx
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LOAD_FUTEX_WAKE (%ecx)
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movl $1, %edx /* Wake one thread. */
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movl $SYS_futex, %eax
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ENTER_KERNEL
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@ -314,6 +328,8 @@ __lll_timedwait_tid:
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jz 4f
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movl %esp, %esi
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/* XXX The kernel so far uses global futex for the wakeup at
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all times. */
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xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
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movl %ebp, %ebx
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movl $SYS_futex, %eax
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@ -1,4 +1,4 @@
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/* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
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/* Copyright (C) 2002, 2003, 2004, 2006, 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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@ -38,6 +38,7 @@
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#define FUTEX_LOCK_PI 6
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#define FUTEX_UNLOCK_PI 7
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#define FUTEX_TRYLOCK_PI 8
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#define FUTEX_PRIVATE_FLAG 128
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/* Initializer for compatibility lock. */
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@ -1,4 +1,4 @@
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/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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/* 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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@ -19,6 +19,8 @@
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#include <unwindbuf.h>
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#include <sysdep.h>
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#include <kernel-features.h>
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#ifndef UP
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# define LOCK lock
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@ -27,7 +29,9 @@
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#endif
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#define SYS_futex 240
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_PRIVATE_FLAG 128
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.comm __fork_generation, 4, 4
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@ -90,7 +94,16 @@ __pthread_once:
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jnz 3f /* Different for generation -> run initializer. */
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/* Somebody else got here first. Wait. */
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movl %esi, %ecx /* movl $FUTEX_WAIT, %ecx */
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#ifdef __ASSUME_PRIVATE_FUTEX
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movl $FUTEX_WAIT|FUTEX_PRIVATE_FLAG, %ecx
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#else
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# if FUTEX_WAIT == 0
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movl %gs:PRIVATE_FUTEX, %ecx
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# else
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movl $FUTEX_WAIT, %ecx
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orl %gs:PRIVATE_FUTEX, %ecx
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# endif
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#endif
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movl $SYS_futex, %eax
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ENTER_KERNEL
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jmp 6b
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@ -131,7 +144,12 @@ __pthread_once:
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/* Wake up all other threads. */
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movl $0x7fffffff, %edx
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#ifdef __ASSUME_PRIVATE_FUTEX
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movl $FUTEX_WAKE|FUTEX_PRIVATE_FLAG, %ecx
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#else
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movl $FUTEX_WAKE, %ecx
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orl %gs:PRIVATE_FUTEX, %ecx
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#endif
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movl $SYS_futex, %eax
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ENTER_KERNEL
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@ -152,7 +170,12 @@ __pthread_once:
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movl $0, (%ebx)
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movl $0x7fffffff, %edx
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#ifdef __ASSUME_PRIVATE_FUTEX
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movl $FUTEX_WAKE|FUTEX_PRIVATE_FLAG, %ecx
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#else
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movl $FUTEX_WAKE, %ecx
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orl %gs:PRIVATE_FUTEX, %ecx
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#endif
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movl $SYS_futex, %eax
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ENTER_KERNEL
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@ -1,4 +1,4 @@
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/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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/* 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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@ -17,6 +17,8 @@
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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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@ -27,4 +29,17 @@
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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 %fs:PRIVATE_FUTEX, reg
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# define LOAD_FUTEX_WAKE(reg) \
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movl %fs: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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@ -31,8 +31,23 @@
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#endif
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#define SYS_futex 202
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#ifndef FUTEX_WAIT
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# define FUTEX_WAIT 0
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# define FUTEX_WAKE 1
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#endif
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#ifndef LOAD_FUTEX_WAIT
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# if FUTEX_WAIT == 0
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# define LOAD_FUTEX_WAIT(reg) \
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xorl reg, reg
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# else
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# define LOAD_FUTEX_WAIT(reg) \
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movl $FUTEX_WAIT, reg
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# endif
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# define LOAD_FUTEX_WAKE(reg) \
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movl $FUTEX_WAKE, reg
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#endif
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/* For the calculation see asm/vsyscall.h. */
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#define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000
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@ -52,11 +67,7 @@ __lll_mutex_lock_wait:
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cfi_offset(%rdx, -24)
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xorq %r10, %r10 /* No timeout. */
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movl $2, %edx
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#if FUTEX_WAIT == 0
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xorl %esi, %esi
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#else
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movl $FUTEX_WAIT, %esi
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#endif
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LOAD_FUTEX_WAIT (%esi)
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cmpl %edx, %eax /* NB: %edx == 2 */
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jne 2f
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@ -151,11 +162,7 @@ __lll_mutex_timedlock_wait:
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je 8f
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movq %rsp, %r10
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#if FUTEX_WAIT == 0
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xorl %esi, %esi
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#else
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movl $FUTEX_WAIT, %esi
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#endif
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LOAD_FUTEX_WAIT (%esi)
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movq %r12, %rdi
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movl $SYS_futex, %eax
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syscall
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@ -247,7 +254,7 @@ __lll_mutex_unlock_wake:
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cfi_offset(%rdx, -24)
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movl $0, (%rdi)
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movl $FUTEX_WAKE, %esi
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LOAD_FUTEX_WAKE (%esi)
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movl $1, %edx /* Wake one thread. */
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movl $SYS_futex, %eax
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syscall
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@ -311,6 +318,8 @@ __lll_timedwait_tid:
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jz 4f
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movq %rsp, %r10
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/* XXX The kernel so far uses global futex for the wakeup at
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all times. */
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#if FUTEX_WAIT == 0
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xorl %esi, %esi
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#else
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@ -39,6 +39,7 @@
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#define FUTEX_LOCK_PI 6
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#define FUTEX_UNLOCK_PI 7
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#define FUTEX_TRYLOCK_PI 8
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#define FUTEX_PRIVATE_FLAG 128
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/* Initializer for compatibility lock. */
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|
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@ -1,4 +1,4 @@
|
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/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
|
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/* Copyright (C) 2002, 2003, 2005, 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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|
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@ -17,6 +17,9 @@
|
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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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|
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#include <kernel-features.h>
|
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#include <tcb-offsets.h>
|
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|
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#ifndef UP
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# define LOCK lock
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#else
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@ -24,7 +27,9 @@
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#endif
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#define SYS_futex 202
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_PRIVATE_FLAG 128
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.comm __fork_generation, 4, 4
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|
||||
@ -74,10 +79,15 @@ __pthread_once:
|
||||
jnz 3f /* Different for generation -> run initializer. */
|
||||
|
||||
/* Somebody else got here first. Wait. */
|
||||
#ifdef __ASSUME_PRIVATE_FUTEX
|
||||
movl $FUTEX_WAIT|FUTEX_PRIVATE_FLAG, %esi
|
||||
#else
|
||||
# if FUTEX_WAIT == 0
|
||||
xorl %esi, %esi
|
||||
movl %fs:PRIVATE_FUTEX, %esi
|
||||
# else
|
||||
movl $FUTEX_WAIT, %esi
|
||||
orl %fs:PRIVATE_FUTEX, %esi
|
||||
# endif
|
||||
#endif
|
||||
movl $SYS_futex, %eax
|
||||
syscall
|
||||
@ -106,7 +116,12 @@ __pthread_once:
|
||||
|
||||
/* Wake up all other threads. */
|
||||
movl $0x7fffffff, %edx
|
||||
#ifdef __ASSUME_PRIVATE_FUTEX
|
||||
movl $FUTEX_WAKE|FUTEX_PRIVATE_FLAG, %esi
|
||||
#else
|
||||
movl $FUTEX_WAKE, %esi
|
||||
orl %fs:PRIVATE_FUTEX, %esi
|
||||
#endif
|
||||
movl $SYS_futex, %eax
|
||||
syscall
|
||||
|
||||
@ -133,7 +148,12 @@ clear_once_control:
|
||||
movl $0, (%rdi)
|
||||
|
||||
movl $0x7fffffff, %edx
|
||||
#ifdef __ASSUME_PRIVATE_FUTEX
|
||||
movl $FUTEX_WAKE|FUTEX_PRIVATE_FLAG, %esi
|
||||
#else
|
||||
movl $FUTEX_WAKE, %esi
|
||||
orl %fs:PRIVATE_FUTEX, %esi
|
||||
#endif
|
||||
movl $SYS_futex, %eax
|
||||
syscall
|
||||
|
||||
|
||||
@ -12,3 +12,6 @@ MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
|
||||
MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads)
|
||||
POINTER_GUARD offsetof (tcbhead_t, pointer_guard)
|
||||
VGETCPU_CACHE_OFFSET offsetof (tcbhead_t, vgetcpu_cache)
|
||||
#ifndef __ASSUME_PRIVATE_FUTEX
|
||||
PRIVATE_FUTEX offsetof (tcbhead_t, private_futex)
|
||||
#endif
|
||||
|
||||
@ -27,6 +27,7 @@
|
||||
# include <stdint.h>
|
||||
# include <stdlib.h>
|
||||
# include <sysdep.h>
|
||||
# include <kernel-features.h>
|
||||
|
||||
|
||||
/* Type for the dtv. */
|
||||
@ -53,6 +54,9 @@ typedef struct
|
||||
uintptr_t stack_guard;
|
||||
uintptr_t pointer_guard;
|
||||
unsigned long int vgetcpu_cache[2];
|
||||
#ifndef __ASSUME_PRIVATE_FUTEX
|
||||
int private_futex;
|
||||
#endif
|
||||
} tcbhead_t;
|
||||
|
||||
#else /* __ASSEMBLER__ */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user