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f3c13160 | 1 | /* low level locking for pthread library. Generic futex-using version. |
04277e02 | 2 | Copyright (C) 2003-2019 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 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
f3c13160 RM |
19 | |
20 | #include <errno.h> | |
21 | #include <sysdep.h> | |
22 | #include <lowlevellock.h> | |
23 | #include <sys/time.h> | |
05087fbb | 24 | #include <atomic.h> |
f3c13160 RM |
25 | |
26 | void | |
e51deae7 | 27 | __lll_lock_wait_private (int *futex) |
f3c13160 | 28 | { |
c012be6f | 29 | if (*futex == 2) |
d52c62df | 30 | lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2. */ |
c012be6f UD |
31 | |
32 | while (atomic_exchange_acq (futex, 2) != 0) | |
d52c62df | 33 | lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2. */ |
e51deae7 UD |
34 | } |
35 | ||
36 | ||
68c97aef | 37 | /* This function doesn't get included in libc. */ |
ce9f10f7 | 38 | #if IS_IN (libpthread) |
e51deae7 UD |
39 | void |
40 | __lll_lock_wait (int *futex, int private) | |
41 | { | |
c012be6f | 42 | if (*futex == 2) |
d52c62df | 43 | lll_futex_wait (futex, 2, private); /* Wait if *futex == 2. */ |
c012be6f UD |
44 | |
45 | while (atomic_exchange_acq (futex, 2) != 0) | |
d52c62df | 46 | lll_futex_wait (futex, 2, private); /* Wait if *futex == 2. */ |
f3c13160 | 47 | } |
f3c13160 | 48 | #endif |