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 _EVENT_Q_H_
18 #define _EVENT_Q_H_
19 
20 
21 #include <stdbool.h>
22 #include <stdint.h>
23 
24 
25 #define EVENT_TYPE_BIT_DISCARDABLE_COMPAT    0x80000000 /* some external apps are using this one */
26 #define EVENT_TYPE_BIT_DISCARDABLE               0x8000 /* set for events we can afford to lose */
27 
28 struct EvtQueue;
29 
30 typedef void (*EvtQueueForciblyDiscardEvtCbkF)(uint32_t evtType, void *evtData, uintptr_t evtFreeData);
31 
32 //multi-producer, SINGLE consumer queue
33 
34 struct EvtQueue* evtQueueAlloc(uint32_t size, EvtQueueForciblyDiscardEvtCbkF forceDiscardCbk);
35 void evtQueueFree(struct EvtQueue* q);
36 bool evtQueueEnqueue(struct EvtQueue* q, uint32_t evtType, void *evtData, uintptr_t evtFreeData, bool atFront /* do not set this unless you know the repercussions. read: never set this in new code */);
37 bool evtQueueDequeue(struct EvtQueue* q, uint32_t *evtTypeP, void **evtDataP, uintptr_t *evtFreeDataP, bool sleepIfNone);
38 
39 
40 #endif
41 
42