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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/*
* libmm-sound
*
* Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
*
* Contact: Seungbae Shin <seungbae.shin@samsung.com>
*
* 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.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <semaphore.h>
#include <fcntl.h>
#include <unistd.h>
#include <aio.h>
#include <mm_ipc.h>
#include <mm_error.h>
#include <mm_debug.h>
#define FIX_PROCESS 1
#include <assert.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <vconf.h>
#define AUDIO_ROUTE_POLICY_LOCK "audio_route_policy_lock"
#define LOCK_TIMEOUT_SEC 6
EXPORT_API
int __mm_sound_lock()
{
sem_t *sem = NULL;
int ret;
int err = MM_ERROR_NONE;
struct timespec wait_time;
sem = sem_open(AUDIO_ROUTE_POLICY_LOCK, O_CREAT, 0666, 1);
if (sem == SEM_FAILED)
{
debug_error("Semaphore open Fail! (name:%s, %s)\n", AUDIO_ROUTE_POLICY_LOCK, strerror(errno));
return MM_ERROR_SOUND_INTERNAL;
}
retry_lock:
wait_time.tv_sec = (long int)(time(NULL)) + LOCK_TIMEOUT_SEC;
wait_time.tv_nsec = 0;
ret = sem_timedwait(sem, &wait_time);
if(ret == -1)
{
switch(errno)
{
case EINTR:
debug_error("Lock RETRY LOCK\n");
goto retry_lock;
break;
case EINVAL:
debug_error("Invalid semaphore\n");
err = MM_ERROR_SOUND_INTERNAL;
break;
case EAGAIN:
debug_error("EAGAIN\n");
err = MM_ERROR_SOUND_INTERNAL;
break;
case ETIMEDOUT:
debug_error("sem_wait leached %d seconds timeout.\n", LOCK_TIMEOUT_SEC);
{
//Recovery of sem_wait lock....in abnormal condition
int sem_value = -1;
if(0 == sem_getvalue(sem, &sem_value))
{
debug_error("%s sem value is %d\n",AUDIO_ROUTE_POLICY_LOCK, sem_value);
if(sem_value == 0)
{
ret = sem_post(sem);
if(ret == -1)
{
debug_error("sem_post error %s : %d\n", AUDIO_ROUTE_POLICY_LOCK, sem_value);
}
else
{
debug_error("lock recovery success...try lock again\n");
goto retry_lock;
}
}
else
{
debug_error("sem value is not 0. but failed sem_timedwait so retry.. : %s\n",AUDIO_ROUTE_POLICY_LOCK);
usleep(5);
goto retry_lock;
}
}
else
{
debug_error("sem_getvalue failed : %s\n",AUDIO_ROUTE_POLICY_LOCK);
}
}
err = MM_ERROR_SOUND_INTERNAL;
break;
}
}
sem_close(sem);
return err;
}
EXPORT_API
int __mm_sound_unlock()
{
sem_t *sem = NULL;
int ret;
int err = MM_ERROR_NONE;
sem = sem_open(AUDIO_ROUTE_POLICY_LOCK, O_CREAT, 0666, 1);
if (sem == SEM_FAILED)
{
debug_error("Semaphore open Fail! (name:%s, errno %d)\n", AUDIO_ROUTE_POLICY_LOCK, errno);
return MM_ERROR_SOUND_INTERNAL;
}
ret = sem_post(sem);
if (ret == -1)
{
debug_error("UNLOCK FAIL\n");
err = MM_ERROR_SOUND_INTERNAL;
}
sem_close(sem);
return err;
}
|
