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 _CM4F_TRYLOCK_H_ 18 #define _CM4F_TRYLOCK_H_ 19 20 #include <stdint.h> 21 #include <stdbool.h> 22 23 #ifdef PLATFORM_HAS_OWN_TRYLOCK 24 #include <plat/trylock.h> 25 #else 26 27 struct TryLock { 28 volatile uint8_t lock; 29 }; 30 31 #define TRYLOCK_DECL_STATIC(name) struct TryLock name 32 #define TRYLOCK_INIT_STATIC() {0} 33 34 void trylockInit(struct TryLock *lock); 35 void trylockRelease(struct TryLock *lock); 36 bool trylockTryTake(struct TryLock *lock); //true if we took it 37 38 /* DON'T YOU EVER DARE TO TRY AND IMPLEMENT A BLOCKING "TAKE" ON THIS TYPE OF LOCK! -dmitrygr@ */ 39 40 #endif //PLATFORM_HAS_OWN_TRYLOCK 41 42 #endif 43 44