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