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abbca718 LOK |
1 | /* |
2 | * This file is part of the libCEC(R) library. | |
3 | * | |
4 | * libCEC(R) is Copyright (C) 2011 Pulse-Eight Limited. All rights reserved. | |
5 | * libCEC(R) is an original work, containing original code. | |
6 | * | |
7 | * libCEC(R) is a trademark of Pulse-Eight Limited. | |
8 | * | |
9 | * This program is dual-licensed; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
22 | * | |
23 | * | |
24 | * Alternatively, you can license this library under a commercial license, | |
25 | * please contact Pulse-Eight Licensing for more information. | |
26 | * | |
27 | * For more information contact: | |
28 | * Pulse-Eight Licensing <license@pulse-eight.com> | |
29 | * http://www.pulse-eight.com/ | |
30 | * http://www.pulse-eight.net/ | |
31 | */ | |
32 | ||
33 | #include "threads.h" | |
34 | #include "timeutils.h" | |
35 | ||
36 | CMutex::CMutex(void) | |
37 | { | |
38 | pthread_mutex_init(&m_mutex, NULL); | |
39 | m_condition = new CCondition(); | |
40 | m_bLocked = false; | |
41 | } | |
42 | ||
43 | CMutex::~CMutex(void) | |
44 | { | |
45 | delete m_condition; | |
46 | pthread_mutex_destroy(&m_mutex); | |
47 | } | |
48 | ||
49 | bool CMutex::TryLock(int64_t iTimeout) | |
50 | { | |
51 | m_bLocked = (pthread_mutex_trylock(&m_mutex) == 0); | |
52 | if (!m_bLocked) | |
53 | { | |
54 | if (m_condition->Wait(this, iTimeout)) | |
55 | m_bLocked = (pthread_mutex_trylock(&m_mutex) == 0); | |
56 | } | |
57 | ||
58 | return m_bLocked; | |
59 | } | |
60 | ||
61 | bool CMutex::Lock(void) | |
62 | { | |
63 | m_bLocked = (pthread_mutex_lock(&m_mutex) == 0); | |
64 | return m_bLocked; | |
65 | } | |
66 | ||
67 | void CMutex::Unlock(void) | |
68 | { | |
69 | pthread_mutex_unlock(&m_mutex); | |
70 | m_bLocked = false; | |
71 | m_condition->Signal(); | |
72 | } | |
73 | ||
74 | CLockObject::CLockObject(CMutex *mutex, int64_t iTimeout /* = -1 */) : | |
75 | m_mutex(mutex), | |
76 | m_bLocked(false) | |
77 | { | |
78 | if (iTimeout > 0) | |
79 | m_bLocked = m_mutex->TryLock(iTimeout); | |
80 | else | |
81 | m_bLocked = m_mutex->Lock(); | |
82 | } | |
83 | ||
84 | CLockObject::~CLockObject(void) | |
85 | { | |
86 | m_mutex->Unlock(); | |
87 | m_bLocked = false; | |
88 | m_mutex = NULL; | |
89 | } | |
90 | ||
91 | CCondition::CCondition(void) | |
92 | { | |
93 | pthread_cond_init(&m_cond, NULL); | |
94 | m_bSignaled = false; | |
95 | } | |
96 | ||
97 | CCondition::~CCondition(void) | |
98 | { | |
99 | pthread_cond_broadcast(&m_cond); | |
100 | pthread_cond_destroy(&m_cond); | |
101 | } | |
102 | ||
103 | void CCondition::Signal(void) | |
104 | { | |
105 | pthread_cond_broadcast(&m_cond); | |
106 | } | |
107 | ||
108 | bool CCondition::Wait(CMutex *mutex, int64_t iTimeout) | |
109 | { | |
110 | struct timespec abstime; | |
111 | struct timeval now; | |
112 | if (gettimeofday(&now, NULL) == 0) | |
113 | { | |
114 | iTimeout += now.tv_usec / 1000; | |
115 | abstime.tv_sec = now.tv_sec + (time_t)(iTimeout / 1000); | |
116 | abstime.tv_nsec = (long)((iTimeout % (unsigned long)1000) * (unsigned long)1000000); | |
117 | m_bSignaled = (pthread_cond_timedwait(&m_cond, &mutex->m_mutex, &abstime) == 0); | |
f99bc831 LOK |
118 | if (!m_bSignaled) |
119 | pthread_mutex_unlock(&mutex->m_mutex); | |
abbca718 LOK |
120 | } |
121 | ||
122 | bool bReturn = m_bSignaled; | |
123 | m_bSignaled = false; | |
124 | ||
125 | return bReturn; | |
126 | } | |
127 | ||
128 | void CCondition::Sleep(int iTimeout) | |
129 | { | |
130 | sched_yield(); | |
131 | CCondition w; | |
132 | CMutex m; | |
133 | w.Wait(&m, iTimeout); | |
134 | } |