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 #include <trylock.h>
18 #include <atomic.h>
19 
20 
trylockInit(struct TryLock * lock)21 void trylockInit(struct TryLock *lock)
22 {
23     lock->lock = 0;
24 }
25 
trylockRelease(struct TryLock * lock)26 void trylockRelease(struct TryLock *lock)
27 {
28     lock->lock = 0;
29 }
30 
trylockTryTake(struct TryLock * lock)31 bool trylockTryTake(struct TryLock *lock)
32 {
33     return !atomicXchgByte(&lock->lock, 1);
34 }
35 
36