diff options
Diffstat (limited to 'REORG.TODO/nptl/lowlevellock.c')
| -rw-r--r-- | REORG.TODO/nptl/lowlevellock.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/REORG.TODO/nptl/lowlevellock.c b/REORG.TODO/nptl/lowlevellock.c new file mode 100644 index 0000000000..fc938768a5 --- /dev/null +++ b/REORG.TODO/nptl/lowlevellock.c @@ -0,0 +1,48 @@ +/* low level locking for pthread library. Generic futex-using version. + Copyright (C) 2003-2017 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 |