1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef ANDROID_AUDIO_FUTEX_H
18 #define ANDROID_AUDIO_FUTEX_H
19
20 // FIXME futex portion is not supported on macOS, should use the macOS alternative
21
22 #ifdef __linux__
23 #include <unistd.h>
24 #include <linux/futex.h>
25 #include <sys/syscall.h>
26 #else
27 #include <errno.h>
28 #define FUTEX_WAIT 0
29 #define FUTEX_WAIT_PRIVATE 0
30 #define FUTEX_WAKE 0
31 #define FUTEX_WAKE_PRIVATE 0
32 #endif
33
34 static inline
sys_futex(void * addr1,int op,int val1,const struct timespec * timeout,void * addr2,int val3)35 int sys_futex(void *addr1, int op, int val1, const struct timespec *timeout, void *addr2,
36 int val3)
37 {
38 #ifdef __linux__
39 return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
40 #else // __linux__
41 // macOS doesn't have futex
42 (void) addr1;
43 (void) op;
44 (void) val1;
45 (void) timeout;
46 (void) addr2;
47 (void) val3;
48 errno = ENOSYS;
49 return -1;
50 #endif // __linux__
51 }
52
53 #endif // !ANDROID_AUDIO_FUTEX_H
54