premiere-libtorrent/src/disk_buffer_pool.cpp

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/*
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Copyright (c) 2007-2013, Arvid Norberg
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All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "libtorrent/disk_buffer_pool.hpp"
#include "libtorrent/assert.hpp"
#include <algorithm>
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#if TORRENT_USE_MLOCK && !defined TORRENT_WINDOWS
#include <sys/mman.h>
#endif
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#ifdef TORRENT_DISK_STATS
#include "libtorrent/time.hpp"
#endif
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namespace libtorrent
{
disk_buffer_pool::disk_buffer_pool(int block_size)
: m_block_size(block_size)
, m_in_use(0)
#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
, m_using_pool_allocator(false)
, m_pool(block_size, m_settings.cache_buffer_chunk_size)
#endif
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{
#if defined TORRENT_DISK_STATS || defined TORRENT_STATS
m_allocations = 0;
#endif
#ifdef TORRENT_DISK_STATS
m_log.open("disk_buffers.log", std::ios::trunc);
m_categories["read cache"] = 0;
m_categories["write cache"] = 0;
m_disk_access_log.open("disk_access.log", std::ios::trunc);
#endif
#if TORRENT_USE_ASSERTS
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m_magic = 0x1337;
#endif
}
#if TORRENT_USE_ASSERTS
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disk_buffer_pool::~disk_buffer_pool()
{
TORRENT_ASSERT(m_magic == 0x1337);
m_magic = 0;
}
#endif
#if TORRENT_USE_ASSERTS || defined TORRENT_DISK_STATS
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bool disk_buffer_pool::is_disk_buffer(char* buffer
, mutex::scoped_lock& l) const
{
TORRENT_ASSERT(m_magic == 0x1337);
#ifdef TORRENT_DISK_STATS
if (m_buf_to_category.find(buffer)
== m_buf_to_category.end()) return false;
#endif
#ifdef TORRENT_DISABLE_POOL_ALLOCATOR
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return true;
#else
if (m_using_pool_allocator)
return m_pool.is_from(buffer);
else
return true;
#endif
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}
bool disk_buffer_pool::is_disk_buffer(char* buffer) const
{
mutex::scoped_lock l(m_pool_mutex);
return is_disk_buffer(buffer, l);
}
#endif
char* disk_buffer_pool::allocate_buffer(char const* category)
{
mutex::scoped_lock l(m_pool_mutex);
TORRENT_ASSERT(m_magic == 0x1337);
char* ret;
#ifdef TORRENT_DISABLE_POOL_ALLOCATOR
ret = page_aligned_allocator::malloc(m_block_size);
#else
if (m_using_pool_allocator)
{
ret = (char*)m_pool.malloc();
m_pool.set_next_size(m_settings.cache_buffer_chunk_size);
}
else
{
ret = page_aligned_allocator::malloc(m_block_size);
}
#endif
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++m_in_use;
#if TORRENT_USE_MLOCK
if (m_settings.lock_disk_cache)
{
#ifdef TORRENT_WINDOWS
VirtualLock(ret, m_block_size);
#else
mlock(ret, m_block_size);
#endif
}
#endif
#if defined TORRENT_DISK_STATS || defined TORRENT_STATS
++m_allocations;
#endif
#ifdef TORRENT_DISK_STATS
++m_categories[category];
m_buf_to_category[ret] = category;
m_log << log_time() << " " << category << ": " << m_categories[category] << "\n";
#endif
TORRENT_ASSERT(ret == 0 || is_disk_buffer(ret, l));
return ret;
}
#ifdef TORRENT_DISK_STATS
void disk_buffer_pool::rename_buffer(char* buf, char const* category)
{
mutex::scoped_lock l(m_pool_mutex);
TORRENT_ASSERT(is_disk_buffer(buf, l));
TORRENT_ASSERT(m_categories.find(m_buf_to_category[buf])
!= m_categories.end());
std::string const& prev_category = m_buf_to_category[buf];
--m_categories[prev_category];
m_log << log_time() << " " << prev_category << ": " << m_categories[prev_category] << "\n";
++m_categories[category];
m_buf_to_category[buf] = category;
m_log << log_time() << " " << category << ": " << m_categories[category] << "\n";
TORRENT_ASSERT(m_categories.find(m_buf_to_category[buf])
!= m_categories.end());
}
#endif
void disk_buffer_pool::free_multiple_buffers(char** bufvec, int numbufs)
{
char** end = bufvec + numbufs;
// sort the pointers in order to maximize cache hits
std::sort(bufvec, end);
mutex::scoped_lock l(m_pool_mutex);
for (; bufvec != end; ++bufvec)
{
char* buf = *bufvec;
TORRENT_ASSERT(buf);
free_buffer_impl(buf, l);;
}
}
void disk_buffer_pool::free_buffer(char* buf)
{
mutex::scoped_lock l(m_pool_mutex);
free_buffer_impl(buf, l);
}
void disk_buffer_pool::free_buffer_impl(char* buf, mutex::scoped_lock& l)
{
TORRENT_ASSERT(buf);
TORRENT_ASSERT(m_magic == 0x1337);
TORRENT_ASSERT(is_disk_buffer(buf, l));
#if defined TORRENT_DISK_STATS || defined TORRENT_STATS
--m_allocations;
#endif
#ifdef TORRENT_DISK_STATS
TORRENT_ASSERT(m_categories.find(m_buf_to_category[buf])
!= m_categories.end());
std::string const& category = m_buf_to_category[buf];
--m_categories[category];
m_log << log_time() << " " << category << ": " << m_categories[category] << "\n";
m_buf_to_category.erase(buf);
#endif
#if TORRENT_USE_MLOCK
if (m_settings.lock_disk_cache)
{
#ifdef TORRENT_WINDOWS
VirtualUnlock(buf, m_block_size);
#else
munlock(buf, m_block_size);
#endif
}
#endif
#ifdef TORRENT_DISABLE_POOL_ALLOCATOR
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page_aligned_allocator::free(buf);
#else
if (m_using_pool_allocator)
m_pool.free(buf);
else
page_aligned_allocator::free(buf);
#endif
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--m_in_use;
#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
// should we switch which allocator to use?
if (m_in_use == 0 && m_settings.use_disk_cache_pool != m_using_pool_allocator)
{
m_pool.release_memory();
m_using_pool_allocator = m_settings.use_disk_cache_pool;
}
#endif
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}
void disk_buffer_pool::release_memory()
{
TORRENT_ASSERT(m_magic == 0x1337);
#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
mutex::scoped_lock l(m_pool_mutex);
if (m_using_pool_allocator)
m_pool.release_memory();
#endif
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}
}