243 lines
6.7 KiB
C++
243 lines
6.7 KiB
C++
/*
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Copyright (c) 2007-2012, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libtorrent/disk_buffer_pool.hpp"
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#include "libtorrent/assert.hpp"
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#include <algorithm>
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#if TORRENT_USE_MLOCK && !defined TORRENT_WINDOWS
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#include <sys/mman.h>
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#endif
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#ifdef TORRENT_DISK_STATS
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#include "libtorrent/time.hpp"
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#endif
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namespace libtorrent
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{
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disk_buffer_pool::disk_buffer_pool(int block_size)
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: m_block_size(block_size)
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, m_in_use(0)
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#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
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, m_using_pool_allocator(false)
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, m_pool(block_size, m_settings.cache_buffer_chunk_size)
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#endif
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{
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#if defined TORRENT_DISK_STATS || defined TORRENT_STATS
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m_allocations = 0;
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#endif
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#ifdef TORRENT_DISK_STATS
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m_log.open("disk_buffers.log", std::ios::trunc);
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m_categories["read cache"] = 0;
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m_categories["write cache"] = 0;
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m_disk_access_log.open("disk_access.log", std::ios::trunc);
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#endif
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#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
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m_magic = 0x1337;
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#endif
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}
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#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
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disk_buffer_pool::~disk_buffer_pool()
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{
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TORRENT_ASSERT(m_magic == 0x1337);
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m_magic = 0;
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}
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#endif
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#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS || defined TORRENT_DISK_STATS
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bool disk_buffer_pool::is_disk_buffer(char* buffer
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, mutex::scoped_lock& l) const
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{
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TORRENT_ASSERT(m_magic == 0x1337);
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#ifdef TORRENT_DISK_STATS
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if (m_buf_to_category.find(buffer)
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== m_buf_to_category.end()) return false;
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#endif
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#ifdef TORRENT_DISABLE_POOL_ALLOCATOR
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return true;
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#else
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if (m_using_pool_allocator)
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return m_pool.is_from(buffer);
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else
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return true;
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#endif
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}
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bool disk_buffer_pool::is_disk_buffer(char* buffer) const
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{
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mutex::scoped_lock l(m_pool_mutex);
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return is_disk_buffer(buffer, l);
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}
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#endif
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char* disk_buffer_pool::allocate_buffer(char const* category)
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{
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mutex::scoped_lock l(m_pool_mutex);
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TORRENT_ASSERT(m_magic == 0x1337);
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char* ret;
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#ifdef TORRENT_DISABLE_POOL_ALLOCATOR
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ret = page_aligned_allocator::malloc(m_block_size);
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#else
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if (m_using_pool_allocator)
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{
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ret = (char*)m_pool.malloc();
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m_pool.set_next_size(m_settings.cache_buffer_chunk_size);
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}
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else
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{
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ret = page_aligned_allocator::malloc(m_block_size);
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}
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#endif
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++m_in_use;
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#if TORRENT_USE_MLOCK
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if (m_settings.lock_disk_cache)
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{
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#ifdef TORRENT_WINDOWS
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VirtualLock(ret, m_block_size);
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#else
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mlock(ret, m_block_size);
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#endif
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}
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#endif
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#if defined TORRENT_DISK_STATS || defined TORRENT_STATS
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++m_allocations;
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#endif
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#ifdef TORRENT_DISK_STATS
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++m_categories[category];
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m_buf_to_category[ret] = category;
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m_log << log_time() << " " << category << ": " << m_categories[category] << "\n";
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#endif
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TORRENT_ASSERT(ret == 0 || is_disk_buffer(ret, l));
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return ret;
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}
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#ifdef TORRENT_DISK_STATS
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void disk_buffer_pool::rename_buffer(char* buf, char const* category)
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{
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mutex::scoped_lock l(m_pool_mutex);
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TORRENT_ASSERT(is_disk_buffer(buf, l));
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TORRENT_ASSERT(m_categories.find(m_buf_to_category[buf])
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!= m_categories.end());
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std::string const& prev_category = m_buf_to_category[buf];
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--m_categories[prev_category];
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m_log << log_time() << " " << prev_category << ": " << m_categories[prev_category] << "\n";
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++m_categories[category];
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m_buf_to_category[buf] = category;
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m_log << log_time() << " " << category << ": " << m_categories[category] << "\n";
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TORRENT_ASSERT(m_categories.find(m_buf_to_category[buf])
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!= m_categories.end());
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}
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#endif
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void disk_buffer_pool::free_multiple_buffers(char** bufvec, int numbufs)
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{
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char** end = bufvec + numbufs;
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// sort the pointers in order to maximize cache hits
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std::sort(bufvec, end);
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mutex::scoped_lock l(m_pool_mutex);
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for (; bufvec != end; ++bufvec)
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{
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char* buf = *bufvec;
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TORRENT_ASSERT(buf);
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free_buffer_impl(buf, l);;
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}
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}
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void disk_buffer_pool::free_buffer(char* buf)
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{
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mutex::scoped_lock l(m_pool_mutex);
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free_buffer_impl(buf, l);
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}
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void disk_buffer_pool::free_buffer_impl(char* buf, mutex::scoped_lock& l)
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{
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TORRENT_ASSERT(buf);
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TORRENT_ASSERT(m_magic == 0x1337);
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TORRENT_ASSERT(is_disk_buffer(buf, l));
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#if defined TORRENT_DISK_STATS || defined TORRENT_STATS
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--m_allocations;
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#endif
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#ifdef TORRENT_DISK_STATS
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TORRENT_ASSERT(m_categories.find(m_buf_to_category[buf])
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!= m_categories.end());
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std::string const& category = m_buf_to_category[buf];
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--m_categories[category];
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m_log << log_time() << " " << category << ": " << m_categories[category] << "\n";
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m_buf_to_category.erase(buf);
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#endif
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#if TORRENT_USE_MLOCK
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if (m_settings.lock_disk_cache)
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{
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#ifdef TORRENT_WINDOWS
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VirtualUnlock(buf, m_block_size);
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#else
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munlock(buf, m_block_size);
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#endif
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}
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#endif
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#ifdef TORRENT_DISABLE_POOL_ALLOCATOR
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page_aligned_allocator::free(buf);
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#else
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if (m_using_pool_allocator)
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m_pool.free(buf);
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else
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page_aligned_allocator::free(buf);
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#endif
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--m_in_use;
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#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
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// should we switch which allocator to use?
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if (m_in_use == 0 && m_settings.use_disk_cache_pool != m_using_pool_allocator)
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{
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m_pool.release_memory();
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m_using_pool_allocator = m_settings.use_disk_cache_pool;
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}
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#endif
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}
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void disk_buffer_pool::release_memory()
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{
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TORRENT_ASSERT(m_magic == 0x1337);
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#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
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mutex::scoped_lock l(m_pool_mutex);
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if (m_using_pool_allocator)
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m_pool.release_memory();
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#endif
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}
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}
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