1 /******************************************************************************
2  *
3  *  Copyright (C) 2014 Google, Inc.
4  *
5  *  Licensed under the Apache License, Version 2.0 (the "License");
6  *  you may not use this file except in compliance with the License.
7  *  You may obtain a copy of the License at:
8  *
9  *  http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  ******************************************************************************/
18 
19 #pragma once
20 
21 #include "base.h"
22 
23 #include <semaphore.h>
24 
25 #define WAIT(callback) \
26   do { \
27     sem_t *semaphore = callbacks_get_semaphore(#callback); \
28     sem_wait(semaphore); \
29   } while (0)
30 
31 #define CALL_AND_WAIT(expression, callback) \
32   do { \
33     sem_t *semaphore = callbacks_get_semaphore(#callback); \
34     while (!sem_trywait(semaphore)); \
35     expression; \
36     sem_wait(semaphore); \
37   } while(0)
38 
39 // To be called from every exit point of the callback. This macro
40 // takes 0 or 1 arguments, the return value of the callback.
41 #define CALLBACK_RET(...) do { \
42     sem_t *semaphore = callbacks_get_semaphore(__func__); \
43     sem_post(semaphore); \
44     return __VA_ARGS__; \
45   } while (0)
46 
47 void callbacks_init();
48 void callbacks_cleanup();
49 
50 bt_callbacks_t *callbacks_get_adapter_struct();
51 btpan_callbacks_t *callbacks_get_pan_struct();
52 btgatt_callbacks_t *callbacks_get_gatt_struct();
53 sem_t *callbacks_get_semaphore(const char *name);
54