| /* low level locking for pthread library. Generic futex-using version. |
| Copyright (C) 2003-2018 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/>. */ |
| |
| #include <errno.h> |
| #include <sysdep.h> |
| #include <lowlevellock.h> |
| #include <sys/time.h> |
| #include <atomic.h> |
| |
| void |
| __lll_lock_wait_private (int *futex) |
| { |
| if (*futex == 2) |
| lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2. */ |
| |
| while (atomic_exchange_acq (futex, 2) != 0) |
| lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2. */ |
| } |
| |
| |
| /* This function doesn't get included in libc. */ |
| #if IS_IN (libpthread) |
| void |
| __lll_lock_wait (int *futex, int private) |
| { |
| if (*futex == 2) |
| lll_futex_wait (futex, 2, private); /* Wait if *futex == 2. */ |
| |
| while (atomic_exchange_acq (futex, 2) != 0) |
| lll_futex_wait (futex, 2, private); /* Wait if *futex == 2. */ |
| } |
| #endif |
