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_ATOMIC_BITSET_H_
18 #define _CM4F_ATOMIC_BITSET_H_
19 
20 #include <stdint.h>
21 #include <stdbool.h>
22 #include "toolchain.h"
23 
24 struct AtomicBitset {
25     uint32_t numBits;
26     uint32_t words[];
27 };
28 
29 #define ATOMIC_BITSET_NUM_WORDS(numbits) (((numbits) + 31) / 32)
30 #define ATOMIC_BITSET_SZ(numbits) (sizeof(struct AtomicBitset) + sizeof(uint32_t) * ATOMIC_BITSET_NUM_WORDS(numbits))
31 #define ATOMIC_BITSET_DECL(nam, numbits, extra_keyword)    DECLARE_OS_ALIGNMENT(nam, ATOMIC_BITSET_SZ(numbits), extra_keyword, struct AtomicBitset)
32 
33 void atomicBitsetInit(struct AtomicBitset *set, uint32_t numBits);
34 uint32_t atomicBitsetGetNumBits(const struct AtomicBitset *set);
35 bool atomicBitsetGetBit(const struct AtomicBitset *set, uint32_t num);
36 void atomicBitsetClearBit(struct AtomicBitset *set, uint32_t num);
37 int32_t atomicBitsetFindClearAndSet(struct AtomicBitset *set);
38 
39 #endif
40 
41 
42