diff options
author | Leonid Lisovskiy <lly.dev@gmail.com> | 2016-05-30 20:19:45 +0300 |
---|---|---|
committer | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2016-05-31 21:00:13 +0200 |
commit | c526740e06e1f7cc0a4747e319c18cde93523482 (patch) | |
tree | 55e41ea90728af2cbf0f6f90a009b106d07c25ff /libpthread/nptl/sysdeps/unix/sysv/linux | |
parent | 361f679c652647cdea4d5a66999a4b96c1653576 (diff) |
ARM: nptl: Use generic lowlevellock.c, patch from glibc
lowlevellock.c for arm differs from the generic lowlevellock.c only in
insignificant ways, so can be removed. Follow glibc commit 6d96f5e4c0
Solves __lll_timedlock_wait busy-wait issues described at
http://sourceware.org/bugzilla/show_bug.cgi?id=15119
Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com>
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux')
3 files changed, 2 insertions, 159 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/Makefile.arch b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/Makefile.arch index 5522ce349..80a03069f 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/Makefile.arch +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/Makefile.arch @@ -7,10 +7,9 @@ libpthread_linux_arch_SSRC = libpthread_linux_arch_CSRC = pthread_once.c \ - pt-__syscall_rt_sigaction.c pt-__syscall_error.c \ - lowlevellock.c + pt-__syscall_rt_sigaction.c pt-__syscall_error.c -libc_linux_arch_CSRC = fork.c libc-lowlevellock.c +libc_linux_arch_CSRC = fork.c libc_linux_arch_SSRC = clone.S vfork.S libc_linux_arch_SSRC-OMIT = waitpid.S diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/libc-lowlevellock.c b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/libc-lowlevellock.c deleted file mode 100644 index 28672a65f..000000000 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/libc-lowlevellock.c +++ /dev/null @@ -1,20 +0,0 @@ -/* Copyright (C) 2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. - - 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/>. */ - -/* No difference to lowlevellock.c, except we lose a couple of functions. */ -#include "lowlevellock.c" diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/lowlevellock.c b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/lowlevellock.c deleted file mode 100644 index cd4213573..000000000 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/lowlevellock.c +++ /dev/null @@ -1,136 +0,0 @@ -/* low level locking for pthread library. Generic futex-using version. - Copyright (C) 2003, 2005, 2007 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 <errno.h> -#include <sysdep.h> -#include <lowlevellock.h> -#include <sys/time.h> -#include <tls.h> - -void -#ifndef IS_IN_libpthread -weak_function -#endif -__lll_lock_wait_private (int *futex) -{ - do - { - int oldval = atomic_compare_and_exchange_val_acq (futex, 2, 1); - if (oldval != 0) - lll_futex_wait (futex, 2, LLL_PRIVATE); - } - while (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0); -} - - -/* These functions don't get included in libc.so */ -#ifdef IS_IN_libpthread -void -__lll_lock_wait (int *futex, int private) -{ - do - { - int oldval = atomic_compare_and_exchange_val_acq (futex, 2, 1); - if (oldval != 0) - lll_futex_wait (futex, 2, private); - } - while (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0); -} - - -int -__lll_timedlock_wait (int *futex, const struct timespec *abstime, int private) -{ - struct timespec rt; - - /* Reject invalid timeouts. */ - if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) - return EINVAL; - - /* Upgrade the lock. */ - if (atomic_exchange_acq (futex, 2) == 0) - return 0; - - do - { - struct timeval tv; - - /* Get the current time. */ - (void) gettimeofday (&tv, NULL); - - /* Compute relative timeout. */ - rt.tv_sec = abstime->tv_sec - tv.tv_sec; - rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000; - if (rt.tv_nsec < 0) - { - rt.tv_nsec += 1000000000; - --rt.tv_sec; - } - - /* Already timed out? */ - if (rt.tv_sec < 0) - return ETIMEDOUT; - - // XYZ: Lost the lock to check whether it was private. - lll_futex_timed_wait (futex, 2, &rt, private); - } - while (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0); - - return 0; -} - - -int -__lll_timedwait_tid (int *tidp, const struct timespec *abstime) -{ - int tid; - - if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) - return EINVAL; - - /* Repeat until thread terminated. */ - while ((tid = *tidp) != 0) - { - struct timeval tv; - struct timespec rt; - - /* Get the current time. */ - (void) gettimeofday (&tv, NULL); - - /* Compute relative timeout. */ - rt.tv_sec = abstime->tv_sec - tv.tv_sec; - rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000; - if (rt.tv_nsec < 0) - { - rt.tv_nsec += 1000000000; - --rt.tv_sec; - } - - /* Already timed out? */ - if (rt.tv_sec < 0) - return ETIMEDOUT; - - /* Wait until thread terminates. */ - // XYZ: Lost the lock to check whether it was private. - if (lll_futex_timed_wait (tidp, tid, &rt, LLL_SHARED) == -ETIMEDOUT) - return ETIMEDOUT; - } - - return 0; -} -#endif |