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8d9254fc | 1 | /* Copyright (C) 2011-2020 Free Software Foundation, Inc. |
aebac0ca RH |
2 | Contributed by Richard Henderson <rth@redhat.com>. |
3 | ||
4 | This file is part of the GNU Transactional Memory Library (libitm). | |
5 | ||
6 | Libitm is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | Libitm is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | more details. | |
15 | ||
16 | Under Section 7 of GPL version 3, you are granted additional | |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
24 | ||
25 | /* Provide target-independant access to the futex system call. */ | |
26 | ||
27 | /* Note for ARM: | |
28 | There are two styles of syscall, and in the eabi style the syscall | |
29 | number goes into the thumb frame pointer. We need to either write | |
30 | this in pure assembler or just defer entirely to libc. */ | |
31 | ||
32 | #include <unistd.h> | |
33 | #include <sys/syscall.h> | |
7cc51d64 | 34 | #include <errno.h> |
aebac0ca RH |
35 | |
36 | static inline long | |
d778b5a0 | 37 | sys_futex0 (std::atomic<int> *addr, int op, int val) |
aebac0ca | 38 | { |
7cc51d64 JJ |
39 | long res = syscall (SYS_futex, (int*) addr, op, val, 0); |
40 | if (__builtin_expect (res == -1, 0)) | |
41 | return -errno; | |
42 | return res; | |
aebac0ca | 43 | } |