/usr/include/ola/io/MemoryBlockPool.h is in libola-dev 0.10.5.nojsmin-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* MemoryBlockPool.h
* Allocates and Releases MemoryBlocks.
* Copyright (C) 2013 Simon Newton
*/
#ifndef INCLUDE_OLA_IO_MEMORYBLOCKPOOL_H_
#define INCLUDE_OLA_IO_MEMORYBLOCKPOOL_H_
#include <ola/Logging.h>
#include <ola/io/MemoryBlock.h>
#include <queue>
namespace ola {
namespace io {
/**
* @brief MemoryBlockPool. This class is not thread safe.
* @param block_size the size of blocks to use.
*/
class MemoryBlockPool {
public:
explicit MemoryBlockPool(unsigned int block_size = DEFAULT_BLOCK_SIZE)
: m_block_size(block_size),
m_blocks_allocated(0) {
}
~MemoryBlockPool() {
Purge();
}
// Allocate a new MemoryBlock from the pool. May return NULL if allocation
// fails.
MemoryBlock *Allocate() {
if (m_free_blocks.empty()) {
uint8_t* data = new uint8_t[m_block_size];
OLA_DEBUG << "new block allocated at @" << reinterpret_cast<int*>(data);
if (data) {
m_blocks_allocated++;
return new MemoryBlock(data, m_block_size);
} else {
return NULL;
}
} else {
MemoryBlock *block = m_free_blocks.front();
m_free_blocks.pop();
return block;
}
}
// Release a MemoryBlock back to the pool.
void Release(MemoryBlock *block) {
m_free_blocks.push(block);
}
// Returns the number of free blocks in the pool.
unsigned int FreeBlocks() const {
return static_cast<unsigned int>(m_free_blocks.size());
}
// Deletes all free blocks.
void Purge() {
Purge(0);
}
// Delete all but remaining free blocks.
void Purge(unsigned int remaining) {
while (m_free_blocks.size() != remaining) {
MemoryBlock *block = m_free_blocks.front();
m_blocks_allocated--;
delete block;
m_free_blocks.pop();
}
}
unsigned int BlocksAllocated() const { return m_blocks_allocated; }
// default to 1k blocks
static const unsigned int DEFAULT_BLOCK_SIZE = 1024;
private:
std::queue<MemoryBlock*> m_free_blocks;
const unsigned int m_block_size;
unsigned int m_blocks_allocated;
};
} // namespace io
} // namespace ola
#endif // INCLUDE_OLA_IO_MEMORYBLOCKPOOL_H_
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