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f3c13160 | 1 | /* low level locking for pthread library. Generic futex-using version. |
d614a753 | 2 | Copyright (C) 2003-2020 Free Software Foundation, Inc. |
f3c13160 RM |
3 | This file is part of the GNU C Library. |
4 | Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
f3c13160 | 19 | |
f3c13160 RM |
20 | #include <sysdep.h> |
21 | #include <lowlevellock.h> | |
05087fbb | 22 | #include <atomic.h> |
d7e4c642 | 23 | #include <stap-probe.h> |
f3c13160 RM |
24 | |
25 | void | |
e51deae7 | 26 | __lll_lock_wait_private (int *futex) |
f3c13160 | 27 | { |
d7e4c642 AZ |
28 | if (atomic_load_relaxed (futex) == 2) |
29 | goto futex; | |
30 | ||
31 | while (atomic_exchange_acquire (futex, 2) != 0) | |
32 | { | |
33 | futex: | |
34 | LIBC_PROBE (lll_lock_wait_private, 1, futex); | |
35 | lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2. */ | |
36 | } | |
e51deae7 UD |
37 | } |
38 | ||
39 | ||
68c97aef | 40 | /* This function doesn't get included in libc. */ |
ce9f10f7 | 41 | #if IS_IN (libpthread) |
e51deae7 UD |
42 | void |
43 | __lll_lock_wait (int *futex, int private) | |
44 | { | |
d7e4c642 AZ |
45 | if (atomic_load_relaxed (futex) == 2) |
46 | goto futex; | |
47 | ||
48 | while (atomic_exchange_acquire (futex, 2) != 0) | |
49 | { | |
50 | futex: | |
51 | LIBC_PROBE (lll_lock_wait, 1, futex); | |
52 | lll_futex_wait (futex, 2, private); /* Wait if *futex == 2. */ | |
53 | } | |
f3c13160 | 54 | } |
f3c13160 | 55 | #endif |