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ConditionVariable.cpp
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1 /* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
2 *
3 * Redistribution and use in source and binary forms, with or without
4 * modification, are permitted provided that the following conditions
5 * are met:
6 * * Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 * * Redistributions in binary form must reproduce the above copyright
9 * notice, this list of conditions and the following disclaimer in the
10 * documentation and/or other materials provided with the distribution.
11 * * Neither the name of NVIDIA CORPORATION nor the names of its
12 * contributors may be used to endorse or promote products derived
13 * from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "ConditionVariable.h"
29 #include "Mutex.h"
30 #include "Error.h"
31
32 namespace ArgusSamples
33 {
34
35 ConditionVariable::ConditionVariable()
36 : m_initialized(false)
37 {
38 }
39
40 ConditionVariable::~ConditionVariable()
41 {
42 shutdown();
43 }
44
45 bool ConditionVariable::initialize()
46 {
47 if (!m_initialized)
48 {
49 if (pthread_cond_init(&m_cond, NULL) != 0)
50 ORIGINATE_ERROR("Failed to initialize condition variable");
51 m_initialized = true;
52 }
53
54 return true;
55 }
56
57 bool ConditionVariable::shutdown()
58 {
59 if (m_initialized)
60 {
61 if (pthread_cond_destroy(&m_cond) != 0)
62 ORIGINATE_ERROR("Failed to destroy condition variable");
63 m_initialized = false;
64 }
65
66 return true;
67 }
68
69 bool ConditionVariable::broadcast() const
70 {
71 if (!m_initialized)
72 ORIGINATE_ERROR("Not initialized");
73
74 if (pthread_cond_broadcast(&m_cond) != 0)
75 ORIGINATE_ERROR("pthread_cond_broadcast failed");
76 return true;
77 }
78
79 bool ConditionVariable::signal() const
80 {
81 if (!m_initialized)
82 ORIGINATE_ERROR("Not initialized");
83
84 if (pthread_cond_signal(&m_cond) != 0)
85 ORIGINATE_ERROR("pthread_cond_signal failed");
86 return true;
87 }
88
89 bool ConditionVariable::wait(const Mutex& mutex) const
90 {
91 if (!m_initialized)
92 ORIGINATE_ERROR("Not initialized");
93
94 if (pthread_cond_wait(&m_cond, mutex.getPThreadMutex()) != 0)
95 ORIGINATE_ERROR("pthread_cond_signal failed");
96 return true;
97 }
98
99 }; // namespace ArgusSamples