103 lines
2.9 KiB
C++
103 lines
2.9 KiB
C++
/*
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Copyright (c) 2009, 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/allocator.hpp"
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#include "libtorrent/config.hpp"
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#ifdef TORRENT_WINDOWS
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#include <Windows.h>
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#elif defined TORRENT_BEOS
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#include <kernel/OS.h>
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#include <stdlib.h> // malloc/free
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#else
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#include <stdlib.h> // valloc/free
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#include <unistd.h> // _SC_PAGESIZE
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#endif
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namespace libtorrent
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{
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int page_size()
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{
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static int s = 0;
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if (s != 0) return s;
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#ifdef TORRENT_WINDOWS
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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s = si.dwPageSize;
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#elif defined TORRENT_BEOS
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s = B_PAGE_SIZE;
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#else
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s = sysconf(_SC_PAGESIZE);
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#endif
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// assume the page size is 4 kiB if we
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// fail to query it
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if (s <= 0) s = 4096;
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return s;
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}
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char* page_aligned_allocator::malloc(const size_type bytes)
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{
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#if TORRENT_USE_POSIX_MEMALIGN
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void* ret;
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if (posix_memalign(&ret, page_size(), bytes) != 0) ret = 0;
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return ret;
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#elif TORRENT_USE_MEMALIGN
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return memalign(page_size(), bytes);
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#elif defined TORRENT_WINDOWS
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return (char*)VirtualAlloc(0, bytes, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
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#elif defined TORRENT_BEOS
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// we could potentially use create_area() here, but
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// you can't free it through its pointer, you need to
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// associate the area_id with the pointer somehow
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return (char*)::malloc(bytes);
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#else
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return (char*)valloc(bytes);
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#endif
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}
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void page_aligned_allocator::free(char* const block)
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{
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#ifdef TORRENT_WINDOWS
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VirtualFree(block, 0, MEM_RELEASE);
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#elif defined TORRENT_BEOS
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return ::free(block);
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#else
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::free(block);
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#endif
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}
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}
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