blob: 592d374817a4777e13d3a90c362a613133f9cb4e (
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
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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
//
// Copyright © 2019 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "BufferManager.hpp"
#include "PacketBuffer.hpp"
namespace arm
{
namespace pipe
{
BufferManager::BufferManager(unsigned int numberOfBuffers, unsigned int maxPacketSize)
: m_MaxBufferSize(maxPacketSize),
m_NumberOfBuffers(numberOfBuffers),
m_MaxNumberOfBuffers(numberOfBuffers * 3),
m_CurrentNumberOfBuffers(numberOfBuffers)
{
Initialize();
}
IPacketBufferPtr BufferManager::Reserve(unsigned int requestedSize, unsigned int& reservedSize)
{
reservedSize = 0;
#if !defined(ARMNN_DISABLE_THREADS)
std::unique_lock<std::mutex> availableListLock(m_AvailableMutex, std::defer_lock);
#endif
if (requestedSize > m_MaxBufferSize)
{
return nullptr;
}
#if !defined(ARMNN_DISABLE_THREADS)
availableListLock.lock();
#endif
if (m_AvailableList.empty())
{
if (m_CurrentNumberOfBuffers < m_MaxNumberOfBuffers)
{
// create a temporary overflow/surge buffer and hand it back
m_CurrentNumberOfBuffers++;
#if !defined(ARMNN_DISABLE_THREADS)
availableListLock.unlock();
#endif
IPacketBufferPtr buffer = std::make_unique<PacketBuffer>(m_MaxBufferSize);
reservedSize = requestedSize;
return buffer;
}
else
{
// we have totally busted the limit. call a halt to new memory allocations.
#if !defined(ARMNN_DISABLE_THREADS)
availableListLock.unlock();
#endif
return nullptr;
}
}
IPacketBufferPtr buffer = std::move(m_AvailableList.back());
m_AvailableList.pop_back();
#if !defined(ARMNN_DISABLE_THREADS)
availableListLock.unlock();
#endif
reservedSize = requestedSize;
return buffer;
}
void BufferManager::Commit(IPacketBufferPtr& packetBuffer, unsigned int size, bool notifyConsumer)
{
#if !defined(ARMNN_DISABLE_THREADS)
std::unique_lock<std::mutex> readableListLock(m_ReadableMutex, std::defer_lock);
#endif
packetBuffer->Commit(size);
#if !defined(ARMNN_DISABLE_THREADS)
readableListLock.lock();
#endif
m_ReadableList.push(std::move(packetBuffer));
#if !defined(ARMNN_DISABLE_THREADS)
readableListLock.unlock();
#endif
if (notifyConsumer)
{
FlushReadList();
}
}
void BufferManager::Initialize()
{
m_AvailableList.reserve(m_NumberOfBuffers);
m_CurrentNumberOfBuffers = m_NumberOfBuffers;
for (unsigned int i = 0; i < m_NumberOfBuffers; ++i)
{
IPacketBufferPtr buffer = std::make_unique<PacketBuffer>(m_MaxBufferSize);
m_AvailableList.emplace_back(std::move(buffer));
}
}
void BufferManager::Release(IPacketBufferPtr& packetBuffer)
{
#if !defined(ARMNN_DISABLE_THREADS)
std::unique_lock<std::mutex> availableListLock(m_AvailableMutex, std::defer_lock);
#endif
packetBuffer->Release();
#if !defined(ARMNN_DISABLE_THREADS)
availableListLock.lock();
#endif
if (m_AvailableList.size() <= m_NumberOfBuffers)
{
m_AvailableList.push_back(std::move(packetBuffer));
}
else
{
// we have been handed a temporary overflow/surge buffer get rid of it
packetBuffer->Destroy();
if (m_CurrentNumberOfBuffers > m_NumberOfBuffers)
{
--m_CurrentNumberOfBuffers;
}
}
#if !defined(ARMNN_DISABLE_THREADS)
availableListLock.unlock();
#endif
}
void BufferManager::Reset()
{
//This method should only be called once all threads have been joined
#if !defined(ARMNN_DISABLE_THREADS)
std::lock_guard<std::mutex> readableListLock(m_ReadableMutex);
std::lock_guard<std::mutex> availableListLock(m_AvailableMutex);
#endif
m_AvailableList.clear();
std::queue<IPacketBufferPtr>().swap(m_ReadableList);
Initialize();
}
IPacketBufferPtr BufferManager::GetReadableBuffer()
{
#if !defined(ARMNN_DISABLE_THREADS)
std::unique_lock<std::mutex> readableListLock(m_ReadableMutex);
#endif
if (!m_ReadableList.empty())
{
IPacketBufferPtr buffer = std::move(m_ReadableList.front());
m_ReadableList.pop();
#if !defined(ARMNN_DISABLE_THREADS)
readableListLock.unlock();
#endif
return buffer;
}
return nullptr;
}
void BufferManager::MarkRead(IPacketBufferPtr& packetBuffer)
{
#if !defined(ARMNN_DISABLE_THREADS)
std::unique_lock<std::mutex> availableListLock(m_AvailableMutex, std::defer_lock);
#endif
packetBuffer->MarkRead();
#if !defined(ARMNN_DISABLE_THREADS)
availableListLock.lock();
#endif
if (m_AvailableList.size() <= m_NumberOfBuffers)
{
m_AvailableList.push_back(std::move(packetBuffer));
}
else
{
// we have been handed a temporary overflow/surge buffer get rid of it
packetBuffer->Destroy();
if (m_CurrentNumberOfBuffers > m_NumberOfBuffers)
{
--m_CurrentNumberOfBuffers;
}
}
#if !defined(ARMNN_DISABLE_THREADS)
availableListLock.unlock();
#endif
}
void BufferManager::SetConsumer(IConsumer* consumer)
{
m_Consumer = consumer;
}
void BufferManager::FlushReadList()
{
// notify consumer that packet is ready to read
if (m_Consumer != nullptr)
{
m_Consumer->SetReadyToRead();
}
}
} // namespace pipe
} // namespace arm
|
