1 /******************************************************************************
2 *
3 * Copyright (C) 2012 Broadcom Corporation
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 /******************************************************************************
20 *
21 * Encapsulate a mutex for thread synchronization.
22 *
23 ******************************************************************************/
24
25 #define LOG_TAG "NfcNciHal"
26 #include "OverrideLog.h"
27 #include "Mutex.h"
28 #include <errno.h>
29
30 /*******************************************************************************
31 **
32 ** Function: Mutex
33 **
34 ** Description: Initialize member variables.
35 **
36 ** Returns: None.
37 **
38 *******************************************************************************/
Mutex()39 Mutex::Mutex ()
40 {
41 memset (&mMutex, 0, sizeof(mMutex));
42 int res = pthread_mutex_init (&mMutex, NULL);
43 if (res != 0)
44 {
45 ALOGE ("Mutex::Mutex: fail init; error=0x%X", res);
46 }
47 }
48
49
50 /*******************************************************************************
51 **
52 ** Function: ~Mutex
53 **
54 ** Description: Cleanup all resources.
55 **
56 ** Returns: None.
57 **
58 *******************************************************************************/
~Mutex()59 Mutex::~Mutex ()
60 {
61 int res = pthread_mutex_destroy (&mMutex);
62 if (res != 0)
63 {
64 ALOGE ("Mutex::~Mutex: fail destroy; error=0x%X", res);
65 }
66 }
67
68
69 /*******************************************************************************
70 **
71 ** Function: lock
72 **
73 ** Description: Block the thread and try lock the mutex.
74 **
75 ** Returns: None.
76 **
77 *******************************************************************************/
lock()78 void Mutex::lock ()
79 {
80 int res = pthread_mutex_lock (&mMutex);
81 if (res != 0)
82 {
83 ALOGE ("Mutex::lock: fail lock; error=0x%X", res);
84 }
85 }
86
87
88 /*******************************************************************************
89 **
90 ** Function: unlock
91 **
92 ** Description: Unlock a mutex to unblock a thread.
93 **
94 ** Returns: None.
95 **
96 *******************************************************************************/
unlock()97 void Mutex::unlock ()
98 {
99 int res = pthread_mutex_unlock (&mMutex);
100 if (res != 0)
101 {
102 ALOGE ("Mutex::unlock: fail unlock; error=0x%X", res);
103 }
104 }
105
106
107 /*******************************************************************************
108 **
109 ** Function: tryLock
110 **
111 ** Description: Try to lock the mutex.
112 **
113 ** Returns: True if the mutex is locked.
114 **
115 *******************************************************************************/
tryLock()116 bool Mutex::tryLock ()
117 {
118 int res = pthread_mutex_trylock (&mMutex);
119 if ((res != 0) && (res != EBUSY))
120 {
121 ALOGE ("Mutex::tryLock: error=0x%X", res);
122 }
123 return res == 0;
124 }
125
126
127 /*******************************************************************************
128 **
129 ** Function: nativeHandle
130 **
131 ** Description: Get the handle of the mutex.
132 **
133 ** Returns: Handle of the mutex.
134 **
135 *******************************************************************************/
nativeHandle()136 pthread_mutex_t* Mutex::nativeHandle ()
137 {
138 return &mMutex;
139 }
140
141
142