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a945c346 | 1 | /* Copyright (C) 2010-2024 Free Software Foundation, Inc. |
d213e92e MS |
2 | Contributed by ARM Ltd. |
3 | ||
f1f3453e TS |
4 | This file is part of the GNU Offloading and Multi Processing Library |
5 | (libgomp). | |
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6 | |
7 | Libgomp is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3, or (at your option) | |
10 | any later version. | |
11 | ||
12 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | more details. | |
16 | ||
17 | Under Section 7 of GPL version 3, you are granted additional | |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
25 | ||
26 | /* Provide target-specific access to the futex system call. */ | |
27 | ||
28 | /* The include file hierachy above us (wait.h) has pushed visibility | |
29 | hidden, this will be applied to prototypes with headers we include | |
30 | with the effect that we cannot link against an external function | |
31 | (syscall). The solution here is to push default visibility, include | |
32 | our required headers then reinstante the original visibility. */ | |
33 | ||
34 | #pragma GCC visibility push(default) | |
35 | ||
36 | #define _GNU_SOURCE | |
37 | #include <unistd.h> | |
38 | #include <sys/syscall.h> | |
39 | ||
40 | #pragma GCC visibility pop | |
41 | ||
42 | static inline void | |
43 | futex_wait (int *addr, int val) | |
44 | { | |
ab18f2f5 RH |
45 | int err = syscall (SYS_futex, addr, gomp_futex_wait, val, NULL); |
46 | if (__builtin_expect (err < 0 && errno == ENOSYS, 0)) | |
d213e92e MS |
47 | { |
48 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
49 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
53b4d41d | 50 | syscall (SYS_futex, addr, gomp_futex_wait, val, NULL); |
d213e92e MS |
51 | } |
52 | } | |
53 | ||
54 | static inline void | |
55 | futex_wake (int *addr, int count) | |
56 | { | |
ab18f2f5 RH |
57 | int err = syscall (SYS_futex, addr, gomp_futex_wake, count); |
58 | if (__builtin_expect (err < 0 && errno == ENOSYS, 0)) | |
d213e92e MS |
59 | { |
60 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
61 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
62 | syscall (SYS_futex, addr, gomp_futex_wake, count); | |
63 | } | |
64 | } | |
65 | ||
66 | static inline void | |
67 | cpu_relax (void) | |
68 | { | |
69 | __asm volatile ("" : : : "memory"); | |
70 | } |