blob: ce8c7f0b4b274ccb24c0bdb07032905d380edd52 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/******************************************************************************
*
* Copyright 2014 Google, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#define LOG_TAG "bt_osi_future"
#include "osi/include/future.h"
#include <bluetooth/log.h>
#include "osi/include/allocator.h"
#include "osi/include/osi.h"
#include "osi/semaphore.h"
using namespace bluetooth;
struct future_t {
bool ready_can_be_called;
semaphore_t* semaphore; // NULL semaphore means immediate future
void* result;
};
static void future_free(future_t* future);
future_t* future_new(void) {
future_t* ret = static_cast<future_t*>(osi_calloc(sizeof(future_t)));
ret->semaphore = semaphore_new(0);
if (!ret->semaphore) {
log::error("unable to allocate memory for the semaphore.");
goto error;
}
ret->ready_can_be_called = true;
return ret;
error:;
future_free(ret);
return NULL;
}
future_t* future_new_immediate(void* value) {
future_t* ret = static_cast<future_t*>(osi_calloc(sizeof(future_t)));
ret->result = value;
ret->ready_can_be_called = false;
return ret;
}
void future_ready(future_t* future, void* value) {
log::assert_that(future != NULL, "assert failed: future != NULL");
log::assert_that(future->ready_can_be_called, "assert failed: future->ready_can_be_called");
future->ready_can_be_called = false;
future->result = value;
semaphore_post(future->semaphore);
}
void* future_await(future_t* future) {
log::assert_that(future != NULL, "assert failed: future != NULL");
// If the future is immediate, it will not have a semaphore
if (future->semaphore) {
semaphore_wait(future->semaphore);
}
void* result = future->result;
future_free(future);
return result;
}
static void future_free(future_t* future) {
if (!future) {
return;
}
semaphore_free(future->semaphore);
osi_free(future);
}
|