3cbc7af037
2005-12-18 Benjamin Kosnik <bkoz@redhat.com> * include/bits/c++config: Add in revised namespace associations. _GLIBCXX_BEGIN_NAMESPACE: New macro. _GLIBCXX_END_NAMESPACE: Same. _GLIBCXX_BEGIN_NESTED_NAMESPACE: Same. _GLIBCXX_END_NESTED_NAMESPACE: Same. * acinclude.m4 (GLIBCXX_ENABLE_SYMVERS]): Add gnu-versioned-namespace. * configure: Regenerated. * config.h.in: Same. * config/abi/pre/gnu-versioned-namespace.ver: New. * config/abi/pre/gnu.ver (GLIBCXX_3.4.7): Add exports for nested debug mode items. * include/Makefile.am (${host_builddir}/c++config.h): Fill in values for __GLIBCXX__ and _GLIBCXX_NAMESPACE_ASSOCIATION_VERSION. * include/Makefile.in: Regnerate. * src/compatibility.cc: Alias new, nested definitions to exported symbols from non-nested __gnu_debug. * src/Makefile.am: Add in ENABLE_SYMVERS_GNU_NAMESPACE. * src/Makefile.in: Regenerate. * docs/html/debug_mode.html: Revise for nested design. * docs/html/debug.html: Use debug qualifications instead of __gnu_debug. * docs/html/configopts.html: Revise documentation for --enable-symvers. * include/debug/formatter: Simplify namespace qualifications for current, nested-only reality. Add top-level namespace alias, namespace debug, for debug-mode containers. * include/debug/safe_iterator.h: Same. * include/debug/set.h: Same. * include/debug/hash_multimap.h: Same. * include/debug/hash_set.h: Same. * include/debug/bitset * include/debug/safe_sequence.h: Same. * include/debug/multiset.h: Same. * include/debug/safe_base.h: Same. * include/debug/functions.h: Same. * include/debug/safe_iterator.tcc * include/debug/hash_multiset.h: Same. * include/debug/vector * include/debug/map.h: Same. * include/debug/deque * include/debug/hash_map.h: Same. * include/debug/string * include/debug/macros.h: Same. * include/debug/list * include/debug/debug.h: Same. * include/debug/multimap.h: Same. * src/debug.cc: Same. * testsuite/23_containers/vector/invalidation/1.cc: Cleanups. * testsuite/23_containers/vector/invalidation/2.cc: Same. * testsuite/23_containers/vector/invalidation/3.cc: Same. * testsuite/23_containers/vector/invalidation/4.cc: Same. * testsuite/23_containers/deque/invalidation/1.cc: Same. * testsuite/23_containers/deque/invalidation/2.cc: Same. * testsuite/23_containers/deque/invalidation/3.cc: Same. * testsuite/23_containers/deque/invalidation/4.cc: Same. * testsuite/23_containers/multiset/invalidation/1.cc: Same. * testsuite/23_containers/multiset/invalidation/2.cc: Same. * testsuite/23_containers/multimap/invalidation/1.cc: Same. * testsuite/23_containers/multimap/invalidation/2.cc: Same. * testsuite/23_containers/bitset/invalidation/1.cc: Same. * testsuite/23_containers/bitset/cons/16020.cc: Same. * testsuite/23_containers/bitset/operations/13838.cc: Same. * testsuite/23_containers/list/invalidation/1.cc: Same. * testsuite/23_containers/list/invalidation/2.cc: Same. * testsuite/23_containers/list/invalidation/3.cc: Same. * testsuite/23_containers/list/invalidation/4.cc: Same. * testsuite/23_containers/set/invalidation/1.cc: Same. * testsuite/23_containers/set/invalidation/2.cc: Same. * testsuite/23_containers/map/invalidation/1.cc: Same. * testsuite/23_containers/map/invalidation/2.cc: Same. * testsuite/23_containers/map/insert/16813.cc: Same. * include/bits/basic_ios.h: Use _GLIBCXX_BEGIN_NAMESPACE(std) and friends. * include/bits/stl_list.h: Same. * include/bits/stl_map.h: Same. * include/bits/stl_algobase.h: Same. * include/bits/localefwd.h: Same. * include/bits/valarray_array.tcc: Same. * include/bits/valarray_after.h: Same. * include/bits/gslice_array.h: Same. * include/bits/stl_queue.h: Same. * include/bits/gslice.h: Same. * include/bits/locale_facets.tcc: Same. * include/bits/locale_classes.h: Same. * include/bits/stl_set.h: Same. * include/bits/locale_facets.h: Same. * include/bits/stl_stack.h: Same. * include/bits/stl_iterator_base_types.h: Same. * include/bits/stl_heap.h: Same. * include/bits/indirect_array.h: Same. * include/bits/atomicity.h: Same. * include/bits/stream_iterator.h: Same. * include/bits/concurrence.h: Same. * include/bits/basic_string.h: Same. * include/bits/stl_multimap.h: Same. * include/bits/stl_pair.h: Same. * include/bits/basic_ios.tcc: Same. * include/bits/stl_raw_storage_iter.h: Same. * include/bits/stl_vector.h: Same. * include/bits/stl_numeric.h: Same. * include/bits/ios_base.h: Same. * include/bits/stl_deque.h: Same. * include/bits/istream.tcc: Same. * include/bits/postypes.h: Same. * include/bits/stl_multiset.h: Same. * include/bits/mask_array.h: Same. * include/bits/stl_uninitialized.h: Same. * include/bits/ostream.tcc: Same. * include/bits/slice_array.h: Same. * include/bits/boost_concept_check.h: Same. * include/bits/sstream.tcc: Same. * include/bits/stl_iterator_base_funcs.h: Same. * include/bits/char_traits.h: Same. * include/bits/stl_algo.h: Same. * include/bits/stringfwd.h: Same. * include/bits/c++config * include/bits/stl_iterator.h: Same. * include/bits/valarray_array.h: Same. * include/bits/stl_tempbuf.h: Same. * include/bits/vector.tcc: Same. * include/bits/deque.tcc: Same. * include/bits/stl_bvector.h: Same. * include/bits/basic_string.tcc: Same. * include/bits/list.tcc: Same. * include/bits/streambuf_iterator.h: Same. * include/bits/valarray_before.h: Same. * include/bits/stl_construct.h: Same. * include/bits/stl_function.h: Same. * include/bits/cpp_type_traits.h: Same. * include/bits/streambuf.tcc: Same. * include/bits/allocator.h: Same. * include/bits/stl_tree.h: Same. * include/bits/fstream.tcc: Same. * include/bits/stl_relops.h: Same. * include/bits/functexcept.h: Same. * include/std/std_valarray.h: Same. * include/std/std_iostream.h: Same. * include/std/std_streambuf.h: Same. * include/std/std_bitset.h: Same. * include/std/std_iosfwd.h: Same. * include/std/std_iomanip.h: Same. * include/std/std_fstream.h: Same. * include/std/std_limits.h: Same. * include/std/std_stdexcept.h: Same. * include/std/std_istream.h: Same. * include/std/std_complex.h: Same. * include/std/std_memory.h: Same. * include/std/std_ostream.h: Same. * include/std/std_sstream.h: Same. * include/c_std/std_csignal.h: Same. * include/c_std/std_cstdlib.h: Same. * include/c_std/std_cstdio.h: Same. * include/c_std/std_cstdarg.h: Same. * include/c_std/std_cctype.h: Same. * include/c_std/std_cmath.h: Same. * include/c_std/std_ctime.h: Same. * include/c_std/std_clocale.h: Same. * include/c_std/std_csetjmp.h: Same. * include/c_std/std_cwchar.h: Same. * include/c_std/std_cstring.h: Same. * include/c_std/std_cstddef.h: Same. * include/c_std/std_cwctype.h: Same. * include/backward/iterator.h: Same. * include/backward/set.h: Same. * include/backward/hashtable.h: Same. * include/backward/fstream.h: Same. * include/backward/tempbuf.h: Same. * include/backward/istream.h: Same. * include/backward/bvector.h: Same. * include/backward/stack.h: Same. * include/backward/rope.h: Same. * include/backward/complex.h: Same. * include/backward/ostream.h: Same. * include/backward/heap.h: Same. * include/backward/iostream.h: Same. * include/backward/function.h: Same. * include/backward/multimap.h: Same. * include/backward/pair.h: Same. * include/backward/stream.h: Same. * include/backward/iomanip.h: Same. * include/backward/strstream * include/backward/slist.h: Same. * include/backward/tree.h: Same. * include/backward/vector.h: Same. * include/backward/deque.h: Same. * include/backward/multiset.h: Same. * include/backward/list.h: Same. * include/backward/map.h: Same. * include/backward/algobase.h: Same. * include/backward/hash_map.h: Same. * include/backward/algo.h: Same. * include/backward/queue.h: Same. * include/backward/streambuf.h: Same. * src/allocator-inst.cc: Same. * src/complex_io.cc: Same. * src/localename.cc: Same. * src/limits.cc: Same. * src/ios_failure.cc: Same. * src/locale-misc-inst.cc: Same. * src/streambuf-inst.cc: Same. * src/misc-inst.cc: Same. * src/concept-inst.cc: Same. * src/ios_locale.cc: Same. * src/pool_allocator.cc: Same. * src/fstream-inst.cc: Same. * src/istream-inst.cc: Same. * src/string-inst.cc: Same. * src/locale_init.cc: Same. * src/ctype.cc: Same. * src/strstream.cc: Same. * src/ostream-inst.cc: Same. * src/functexcept.cc: Same. * src/streambuf.cc: Same. * src/sstream-inst.cc: Same. * src/ios.cc: Same. * src/valarray-inst.cc: Same. * src/locale.cc: Same. * src/tree.cc: Same. * src/stdexcept.cc: Same. * src/istream.cc: Same. * src/compatibility.cc: Same. * src/locale-inst.cc: Same. * src/globals_io.cc: Same. * src/list.cc: Same. * src/ios_init.cc: Same. * src/locale_facets.cc: Same. * src/codecvt.cc: Same. * include/tr1/unordered_map: Use _GLIBCXX_BEGIN_NAMESPACE(tr1). * include/tr1/boost_shared_ptr.h: Same. * include/tr1/tuple * include/tr1/hashtable * include/tr1/type_traits_fwd.h: Same. * include/tr1/unordered_set * include/tr1/functional * include/tr1/ref_fwd.h: Same. * include/tr1/utility * include/tr1/type_traits * include/tr1/array * include/ext/hashtable.h: Use _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx). * include/ext/typelist.h: Same. * include/ext/hash_map: Same. * include/ext/rc_string_base.h: Same. * include/ext/pool_allocator.h: Same. * include/ext/iterator: Same. * include/ext/rb_tree: Same. * include/ext/numeric: Same. * include/ext/vstring.tcc: Same. * include/ext/sso_string_base.h: Same. * include/ext/stdio_filebuf.h: Same. * include/ext/algorithm: Same. * include/ext/codecvt_specializations.h: Same. * include/ext/new_allocator.h: Same. * include/ext/array_allocator.h: Same. * include/ext/vstring_util.h: Same. * include/ext/vstring_fwd.h: Same. * include/ext/mt_allocator.h: Same. * include/ext/debug_allocator.h: Same. * include/ext/slist: Same. * include/ext/stdio_sync_filebuf.h: Same. * include/ext/hash_fun.h: Same. * include/ext/malloc_allocator.h: Same. * include/ext/functional: Same. * include/ext/bitmap_allocator.h: Same. * include/ext/pod_char_traits.h: Same. * include/ext/vstring.h: Same. * include/ext/ropeimpl.h: Same. * include/ext/hash_set: Same. * include/ext/memory: Same. * include/ext/rope: Same. * include/bits/boost_concept_check.h: Same. * include/bits/stl_iterator.h: Same. * include/bits/char_traits.h: Same. * include/bits/cpp_type_traits.h: Same. * include/bits/concurrence.h: Same. * include/bits/atomicity.h: Same. * config/locale/gnu/numeric_members.cc: Same. * config/locale/gnu/collate_members.cc: Same. * config/locale/gnu/ctype_members.cc: Same. * config/locale/gnu/c_locale.cc: Same. * config/locale/gnu/codecvt_members.cc: Same. * config/locale/gnu/messages_members.cc: Same. * config/locale/gnu/c_locale.h: Same. * config/locale/gnu/monetary_members.cc: Same. * config/locale/gnu/time_members.cc: Same. * config/locale/ieee_1003.1-2001/c_locale.h: Same. * config/locale/generic/numeric_members.cc: Same. * config/locale/generic/collate_members.cc: Same. * config/locale/generic/ctype_members.cc: Same. * config/locale/generic/c_locale.cc: Same. * config/locale/generic/codecvt_members.cc: Same. * config/locale/generic/messages_members.cc: Same. * config/locale/generic/c_locale.h: Same. * config/locale/generic/monetary_members.cc: Same. * config/locale/generic/time_members.cc: Same. * config/os/aix/atomicity.h: Same. * config/os/irix/atomicity.h: Same. * config/cpu/powerpc/atomicity.h: Same. * config/cpu/cris/atomicity.h: Same. * config/cpu/ia64/atomicity.h: Same. * config/cpu/alpha/atomicity.h: Same. * config/cpu/m68k/atomicity.h: Same. * config/cpu/hppa/atomicity.h: Same. * config/cpu/mips/atomicity.h: Same. * config/cpu/sparc/atomicity.h: Same. * config/cpu/i386/atomicity.h: Same. * config/cpu/i486/atomicity.h: Same. * config/cpu/sh/atomicity.h: Same. * config/cpu/generic/atomicity.h: Same. * config/cpu/s390/atomicity.h: Same. * config/io/c_io_stdio.h: Same. * config/io/basic_file_stdio.cc: Same. * config/io/basic_file_stdio.h: Same. * src/misc-inst.cc: Same. * src/concept-inst.cc: Same. * src/ext-inst.cc: Same. * src/string-inst.cc: Same. * src/pool_allocator.cc: Same. * src/bitmap_allocator.cc: Same. * src/mt_allocator.cc: Same. * libsupc++/exception: Same. * libsupc++/vterminate.cc: Same. * testsuite/ext/hash_map/1.cc: Explicitly qualify __gnu_cxx::hash_map. * testsuite/ext/hash_map/14648.cc: Same. * libsupc++/eh_alloc.cc: Correct comment line spacing. From-SVN: r108775
1294 lines
34 KiB
C++
1294 lines
34 KiB
C++
// Bitmap Allocator. -*- C++ -*-
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// Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file ext/bitmap_allocator.h
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* This file is a GNU extension to the Standard C++ Library.
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*/
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#ifndef _BITMAP_ALLOCATOR_H
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#define _BITMAP_ALLOCATOR_H 1
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// For std::size_t, and ptrdiff_t.
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#include <cstddef>
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// For __throw_bad_alloc().
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#include <bits/functexcept.h>
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// For std::pair.
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#include <utility>
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// For greater_equal, and less_equal.
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#include <functional>
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// For operator new.
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#include <new>
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// For __gthread_mutex_t, __gthread_mutex_lock and __gthread_mutex_unlock.
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#include <bits/gthr.h>
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// Define this to enable error checking withing the allocator
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// itself(to debug the allocator itself).
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//#define _BALLOC_SANITY_CHECK
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/** @brief The constant in the expression below is the alignment
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* required in bytes.
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*/
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#define _BALLOC_ALIGN_BYTES 8
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#if defined _BALLOC_SANITY_CHECK
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#include <cassert>
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#define _BALLOC_ASSERT(_EXPR) assert(_EXPR)
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#else
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#define _BALLOC_ASSERT(_EXPR)
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#endif
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_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
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#if defined __GTHREADS
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namespace
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{
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/** @brief If true, then the application being compiled will be
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* using threads, so use mutexes as a synchronization primitive,
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* else do no use any synchronization primitives.
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*/
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bool const __threads_enabled = __gthread_active_p();
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}
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#endif
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#if defined __GTHREADS
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/** @class _Mutex bitmap_allocator.h bitmap_allocator.h
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*
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* @brief _Mutex is an OO-Wrapper for __gthread_mutex_t.
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*
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* It does not allow you to copy or assign an already initialized
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* mutex. This is used merely as a convenience for the locking
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* classes.
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*/
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class _Mutex
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{
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__gthread_mutex_t _M_mut;
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// Prevent Copying and assignment.
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_Mutex(_Mutex const&);
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_Mutex& operator=(_Mutex const&);
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public:
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_Mutex()
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{
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if (__threads_enabled)
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{
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#if !defined __GTHREAD_MUTEX_INIT
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__GTHREAD_MUTEX_INIT_FUNCTION(&_M_mut);
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#else
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__gthread_mutex_t __mtemp = __GTHREAD_MUTEX_INIT;
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_M_mut = __mtemp;
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#endif
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}
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}
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~_Mutex()
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{
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// Gthreads does not define a Mutex Destruction Function.
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}
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__gthread_mutex_t*
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_M_get() { return &_M_mut; }
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};
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/** @class _Lock bitmap_allocator.h bitmap_allocator.h
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*
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* @brief _Lock is a simple manual locking class which allows you to
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* manually lock and unlock a mutex associated with the lock.
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*
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* There is no automatic locking or unlocking happening without the
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* programmer's explicit instructions. This class unlocks the mutex
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* ONLY if it has not been locked. However, this check does not
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* apply for locking, and wayward use may cause dead-locks.
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*/
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class _Lock
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{
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_Mutex* _M_pmt;
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bool _M_locked;
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// Prevent Copying and assignment.
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_Lock(_Lock const&);
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_Lock& operator=(_Lock const&);
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public:
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_Lock(_Mutex* __mptr)
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: _M_pmt(__mptr), _M_locked(false)
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{ }
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void
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_M_lock()
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{
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if (__threads_enabled)
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{
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_M_locked = true;
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__gthread_mutex_lock(_M_pmt->_M_get());
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}
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}
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void
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_M_unlock()
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{
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if (__threads_enabled)
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{
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if (__builtin_expect(_M_locked, true))
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{
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__gthread_mutex_unlock(_M_pmt->_M_get());
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_M_locked = false;
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}
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}
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}
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~_Lock() { }
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};
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/** @class _Auto_Lock bitmap_allocator.h bitmap_allocator.h
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*
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* @brief _Auto_Lock locks the associated mutex on construction, and
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* unlocks on destruction.
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*
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* There are no checks performed, and this class follows the RAII
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* principle.
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*/
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class _Auto_Lock
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{
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_Mutex* _M_pmt;
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// Prevent Copying and assignment.
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_Auto_Lock(_Auto_Lock const&);
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_Auto_Lock& operator=(_Auto_Lock const&);
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void
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_M_lock()
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{
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if (__threads_enabled)
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__gthread_mutex_lock(_M_pmt->_M_get());
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}
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void
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_M_unlock()
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{
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if (__threads_enabled)
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__gthread_mutex_unlock(_M_pmt->_M_get());
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}
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public:
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_Auto_Lock(_Mutex* __mptr) : _M_pmt(__mptr)
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{ this->_M_lock(); }
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~_Auto_Lock() { this->_M_unlock(); }
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};
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#endif
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namespace balloc
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{
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/** @class __mini_vector bitmap_allocator.h bitmap_allocator.h
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*
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* @brief __mini_vector<> is a stripped down version of the
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* full-fledged std::vector<>.
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*
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* It is to be used only for built-in types or PODs. Notable
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* differences are:
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*
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* @detail
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* 1. Not all accessor functions are present.
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* 2. Used ONLY for PODs.
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* 3. No Allocator template argument. Uses ::operator new() to get
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* memory, and ::operator delete() to free it.
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* Caveat: The dtor does NOT free the memory allocated, so this a
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* memory-leaking vector!
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*/
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template<typename _Tp>
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class __mini_vector
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{
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__mini_vector(const __mini_vector&);
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__mini_vector& operator=(const __mini_vector&);
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public:
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typedef _Tp value_type;
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typedef _Tp* pointer;
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typedef _Tp& reference;
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typedef const _Tp& const_reference;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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typedef pointer iterator;
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private:
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pointer _M_start;
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pointer _M_finish;
|
|
pointer _M_end_of_storage;
|
|
|
|
size_type
|
|
_M_space_left() const throw()
|
|
{ return _M_end_of_storage - _M_finish; }
|
|
|
|
pointer
|
|
allocate(size_type __n)
|
|
{ return static_cast<pointer>(::operator new(__n * sizeof(_Tp))); }
|
|
|
|
void
|
|
deallocate(pointer __p, size_type)
|
|
{ ::operator delete(__p); }
|
|
|
|
public:
|
|
// Members used: size(), push_back(), pop_back(),
|
|
// insert(iterator, const_reference), erase(iterator),
|
|
// begin(), end(), back(), operator[].
|
|
|
|
__mini_vector() : _M_start(0), _M_finish(0),
|
|
_M_end_of_storage(0)
|
|
{ }
|
|
|
|
#if 0
|
|
~__mini_vector()
|
|
{
|
|
if (this->_M_start)
|
|
{
|
|
this->deallocate(this->_M_start, this->_M_end_of_storage
|
|
- this->_M_start);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
size_type
|
|
size() const throw()
|
|
{ return _M_finish - _M_start; }
|
|
|
|
iterator
|
|
begin() const throw()
|
|
{ return this->_M_start; }
|
|
|
|
iterator
|
|
end() const throw()
|
|
{ return this->_M_finish; }
|
|
|
|
reference
|
|
back() const throw()
|
|
{ return *(this->end() - 1); }
|
|
|
|
reference
|
|
operator[](const size_type __pos) const throw()
|
|
{ return this->_M_start[__pos]; }
|
|
|
|
void
|
|
insert(iterator __pos, const_reference __x);
|
|
|
|
void
|
|
push_back(const_reference __x)
|
|
{
|
|
if (this->_M_space_left())
|
|
{
|
|
*this->end() = __x;
|
|
++this->_M_finish;
|
|
}
|
|
else
|
|
this->insert(this->end(), __x);
|
|
}
|
|
|
|
void
|
|
pop_back() throw()
|
|
{ --this->_M_finish; }
|
|
|
|
void
|
|
erase(iterator __pos) throw();
|
|
|
|
void
|
|
clear() throw()
|
|
{ this->_M_finish = this->_M_start; }
|
|
};
|
|
|
|
// Out of line function definitions.
|
|
template<typename _Tp>
|
|
void __mini_vector<_Tp>::
|
|
insert(iterator __pos, const_reference __x)
|
|
{
|
|
if (this->_M_space_left())
|
|
{
|
|
size_type __to_move = this->_M_finish - __pos;
|
|
iterator __dest = this->end();
|
|
iterator __src = this->end() - 1;
|
|
|
|
++this->_M_finish;
|
|
while (__to_move)
|
|
{
|
|
*__dest = *__src;
|
|
--__dest; --__src; --__to_move;
|
|
}
|
|
*__pos = __x;
|
|
}
|
|
else
|
|
{
|
|
size_type __new_size = this->size() ? this->size() * 2 : 1;
|
|
iterator __new_start = this->allocate(__new_size);
|
|
iterator __first = this->begin();
|
|
iterator __start = __new_start;
|
|
while (__first != __pos)
|
|
{
|
|
*__start = *__first;
|
|
++__start; ++__first;
|
|
}
|
|
*__start = __x;
|
|
++__start;
|
|
while (__first != this->end())
|
|
{
|
|
*__start = *__first;
|
|
++__start; ++__first;
|
|
}
|
|
if (this->_M_start)
|
|
this->deallocate(this->_M_start, this->size());
|
|
|
|
this->_M_start = __new_start;
|
|
this->_M_finish = __start;
|
|
this->_M_end_of_storage = this->_M_start + __new_size;
|
|
}
|
|
}
|
|
|
|
template<typename _Tp>
|
|
void __mini_vector<_Tp>::
|
|
erase(iterator __pos) throw()
|
|
{
|
|
while (__pos + 1 != this->end())
|
|
{
|
|
*__pos = __pos[1];
|
|
++__pos;
|
|
}
|
|
--this->_M_finish;
|
|
}
|
|
|
|
|
|
template<typename _Tp>
|
|
struct __mv_iter_traits
|
|
{
|
|
typedef typename _Tp::value_type value_type;
|
|
typedef typename _Tp::difference_type difference_type;
|
|
};
|
|
|
|
template<typename _Tp>
|
|
struct __mv_iter_traits<_Tp*>
|
|
{
|
|
typedef _Tp value_type;
|
|
typedef std::ptrdiff_t difference_type;
|
|
};
|
|
|
|
enum
|
|
{
|
|
bits_per_byte = 8,
|
|
bits_per_block = sizeof(size_t) * size_t(bits_per_byte)
|
|
};
|
|
|
|
template<typename _ForwardIterator, typename _Tp, typename _Compare>
|
|
_ForwardIterator
|
|
__lower_bound(_ForwardIterator __first, _ForwardIterator __last,
|
|
const _Tp& __val, _Compare __comp)
|
|
{
|
|
typedef typename __mv_iter_traits<_ForwardIterator>::value_type
|
|
_ValueType;
|
|
typedef typename __mv_iter_traits<_ForwardIterator>::difference_type
|
|
_DistanceType;
|
|
|
|
_DistanceType __len = __last - __first;
|
|
_DistanceType __half;
|
|
_ForwardIterator __middle;
|
|
|
|
while (__len > 0)
|
|
{
|
|
__half = __len >> 1;
|
|
__middle = __first;
|
|
__middle += __half;
|
|
if (__comp(*__middle, __val))
|
|
{
|
|
__first = __middle;
|
|
++__first;
|
|
__len = __len - __half - 1;
|
|
}
|
|
else
|
|
__len = __half;
|
|
}
|
|
return __first;
|
|
}
|
|
|
|
template<typename _InputIterator, typename _Predicate>
|
|
inline _InputIterator
|
|
__find_if(_InputIterator __first, _InputIterator __last, _Predicate __p)
|
|
{
|
|
while (__first != __last && !__p(*__first))
|
|
++__first;
|
|
return __first;
|
|
}
|
|
|
|
/** @brief The number of Blocks pointed to by the address pair
|
|
* passed to the function.
|
|
*/
|
|
template<typename _AddrPair>
|
|
inline size_t
|
|
__num_blocks(_AddrPair __ap)
|
|
{ return (__ap.second - __ap.first) + 1; }
|
|
|
|
/** @brief The number of Bit-maps pointed to by the address pair
|
|
* passed to the function.
|
|
*/
|
|
template<typename _AddrPair>
|
|
inline size_t
|
|
__num_bitmaps(_AddrPair __ap)
|
|
{ return __num_blocks(__ap) / size_t(bits_per_block); }
|
|
|
|
// _Tp should be a pointer type.
|
|
template<typename _Tp>
|
|
class _Inclusive_between
|
|
: public std::unary_function<typename std::pair<_Tp, _Tp>, bool>
|
|
{
|
|
typedef _Tp pointer;
|
|
pointer _M_ptr_value;
|
|
typedef typename std::pair<_Tp, _Tp> _Block_pair;
|
|
|
|
public:
|
|
_Inclusive_between(pointer __ptr) : _M_ptr_value(__ptr)
|
|
{ }
|
|
|
|
bool
|
|
operator()(_Block_pair __bp) const throw()
|
|
{
|
|
if (std::less_equal<pointer>()(_M_ptr_value, __bp.second)
|
|
&& std::greater_equal<pointer>()(_M_ptr_value, __bp.first))
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
};
|
|
|
|
// Used to pass a Functor to functions by reference.
|
|
template<typename _Functor>
|
|
class _Functor_Ref
|
|
: public std::unary_function<typename _Functor::argument_type,
|
|
typename _Functor::result_type>
|
|
{
|
|
_Functor& _M_fref;
|
|
|
|
public:
|
|
typedef typename _Functor::argument_type argument_type;
|
|
typedef typename _Functor::result_type result_type;
|
|
|
|
_Functor_Ref(_Functor& __fref) : _M_fref(__fref)
|
|
{ }
|
|
|
|
result_type
|
|
operator()(argument_type __arg)
|
|
{ return _M_fref(__arg); }
|
|
};
|
|
|
|
/** @class _Ffit_finder bitmap_allocator.h bitmap_allocator.h
|
|
*
|
|
* @brief The class which acts as a predicate for applying the
|
|
* first-fit memory allocation policy for the bitmap allocator.
|
|
*/
|
|
// _Tp should be a pointer type, and _Alloc is the Allocator for
|
|
// the vector.
|
|
template<typename _Tp>
|
|
class _Ffit_finder
|
|
: public std::unary_function<typename std::pair<_Tp, _Tp>, bool>
|
|
{
|
|
typedef typename std::pair<_Tp, _Tp> _Block_pair;
|
|
typedef typename balloc::__mini_vector<_Block_pair> _BPVector;
|
|
typedef typename _BPVector::difference_type _Counter_type;
|
|
|
|
size_t* _M_pbitmap;
|
|
_Counter_type _M_data_offset;
|
|
|
|
public:
|
|
_Ffit_finder() : _M_pbitmap(0), _M_data_offset(0)
|
|
{ }
|
|
|
|
bool
|
|
operator()(_Block_pair __bp) throw()
|
|
{
|
|
// Set the _rover to the last physical location bitmap,
|
|
// which is the bitmap which belongs to the first free
|
|
// block. Thus, the bitmaps are in exact reverse order of
|
|
// the actual memory layout. So, we count down the bimaps,
|
|
// which is the same as moving up the memory.
|
|
|
|
// If the used count stored at the start of the Bit Map headers
|
|
// is equal to the number of Objects that the current Block can
|
|
// store, then there is definitely no space for another single
|
|
// object, so just return false.
|
|
_Counter_type __diff =
|
|
__gnu_cxx::balloc::__num_bitmaps(__bp);
|
|
|
|
if (*(reinterpret_cast<size_t*>
|
|
(__bp.first) - (__diff + 1))
|
|
== __gnu_cxx::balloc::__num_blocks(__bp))
|
|
return false;
|
|
|
|
size_t* __rover = reinterpret_cast<size_t*>(__bp.first) - 1;
|
|
|
|
for (_Counter_type __i = 0; __i < __diff; ++__i)
|
|
{
|
|
_M_data_offset = __i;
|
|
if (*__rover)
|
|
{
|
|
_M_pbitmap = __rover;
|
|
return true;
|
|
}
|
|
--__rover;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
size_t*
|
|
_M_get() const throw()
|
|
{ return _M_pbitmap; }
|
|
|
|
_Counter_type
|
|
_M_offset() const throw()
|
|
{ return _M_data_offset * size_t(bits_per_block); }
|
|
};
|
|
|
|
|
|
/** @class _Bitmap_counter bitmap_allocator.h bitmap_allocator.h
|
|
*
|
|
* @brief The bitmap counter which acts as the bitmap
|
|
* manipulator, and manages the bit-manipulation functions and
|
|
* the searching and identification functions on the bit-map.
|
|
*/
|
|
// _Tp should be a pointer type.
|
|
template<typename _Tp>
|
|
class _Bitmap_counter
|
|
{
|
|
typedef typename balloc::__mini_vector<typename std::pair<_Tp, _Tp> >
|
|
_BPVector;
|
|
typedef typename _BPVector::size_type _Index_type;
|
|
typedef _Tp pointer;
|
|
|
|
_BPVector& _M_vbp;
|
|
size_t* _M_curr_bmap;
|
|
size_t* _M_last_bmap_in_block;
|
|
_Index_type _M_curr_index;
|
|
|
|
public:
|
|
// Use the 2nd parameter with care. Make sure that such an
|
|
// entry exists in the vector before passing that particular
|
|
// index to this ctor.
|
|
_Bitmap_counter(_BPVector& Rvbp, long __index = -1) : _M_vbp(Rvbp)
|
|
{ this->_M_reset(__index); }
|
|
|
|
void
|
|
_M_reset(long __index = -1) throw()
|
|
{
|
|
if (__index == -1)
|
|
{
|
|
_M_curr_bmap = 0;
|
|
_M_curr_index = static_cast<_Index_type>(-1);
|
|
return;
|
|
}
|
|
|
|
_M_curr_index = __index;
|
|
_M_curr_bmap = reinterpret_cast<size_t*>
|
|
(_M_vbp[_M_curr_index].first) - 1;
|
|
|
|
_BALLOC_ASSERT(__index <= (long)_M_vbp.size() - 1);
|
|
|
|
_M_last_bmap_in_block = _M_curr_bmap
|
|
- ((_M_vbp[_M_curr_index].second
|
|
- _M_vbp[_M_curr_index].first + 1)
|
|
/ size_t(bits_per_block) - 1);
|
|
}
|
|
|
|
// Dangerous Function! Use with extreme care. Pass to this
|
|
// function ONLY those values that are known to be correct,
|
|
// otherwise this will mess up big time.
|
|
void
|
|
_M_set_internal_bitmap(size_t* __new_internal_marker) throw()
|
|
{ _M_curr_bmap = __new_internal_marker; }
|
|
|
|
bool
|
|
_M_finished() const throw()
|
|
{ return(_M_curr_bmap == 0); }
|
|
|
|
_Bitmap_counter&
|
|
operator++() throw()
|
|
{
|
|
if (_M_curr_bmap == _M_last_bmap_in_block)
|
|
{
|
|
if (++_M_curr_index == _M_vbp.size())
|
|
_M_curr_bmap = 0;
|
|
else
|
|
this->_M_reset(_M_curr_index);
|
|
}
|
|
else
|
|
--_M_curr_bmap;
|
|
return *this;
|
|
}
|
|
|
|
size_t*
|
|
_M_get() const throw()
|
|
{ return _M_curr_bmap; }
|
|
|
|
pointer
|
|
_M_base() const throw()
|
|
{ return _M_vbp[_M_curr_index].first; }
|
|
|
|
_Index_type
|
|
_M_offset() const throw()
|
|
{
|
|
return size_t(bits_per_block)
|
|
* ((reinterpret_cast<size_t*>(this->_M_base())
|
|
- _M_curr_bmap) - 1);
|
|
}
|
|
|
|
_Index_type
|
|
_M_where() const throw()
|
|
{ return _M_curr_index; }
|
|
};
|
|
|
|
/** @brief Mark a memory address as allocated by re-setting the
|
|
* corresponding bit in the bit-map.
|
|
*/
|
|
inline void
|
|
__bit_allocate(size_t* __pbmap, size_t __pos) throw()
|
|
{
|
|
size_t __mask = 1 << __pos;
|
|
__mask = ~__mask;
|
|
*__pbmap &= __mask;
|
|
}
|
|
|
|
/** @brief Mark a memory address as free by setting the
|
|
* corresponding bit in the bit-map.
|
|
*/
|
|
inline void
|
|
__bit_free(size_t* __pbmap, size_t __pos) throw()
|
|
{
|
|
size_t __mask = 1 << __pos;
|
|
*__pbmap |= __mask;
|
|
}
|
|
} // namespace balloc
|
|
|
|
/** @brief Generic Version of the bsf instruction.
|
|
*/
|
|
inline size_t
|
|
_Bit_scan_forward(size_t __num)
|
|
{ return static_cast<size_t>(__builtin_ctzl(__num)); }
|
|
|
|
/** @class free_list bitmap_allocator.h bitmap_allocator.h
|
|
*
|
|
* @brief The free list class for managing chunks of memory to be
|
|
* given to and returned by the bitmap_allocator.
|
|
*/
|
|
class free_list
|
|
{
|
|
typedef size_t* value_type;
|
|
typedef balloc::__mini_vector<value_type> vector_type;
|
|
typedef vector_type::iterator iterator;
|
|
|
|
struct _LT_pointer_compare
|
|
{
|
|
bool
|
|
operator()(const size_t* __pui,
|
|
const size_t __cui) const throw()
|
|
{ return *__pui < __cui; }
|
|
};
|
|
|
|
#if defined __GTHREADS
|
|
_Mutex*
|
|
_M_get_mutex()
|
|
{
|
|
static _Mutex _S_mutex;
|
|
return &_S_mutex;
|
|
}
|
|
#endif
|
|
|
|
vector_type&
|
|
_M_get_free_list()
|
|
{
|
|
static vector_type _S_free_list;
|
|
return _S_free_list;
|
|
}
|
|
|
|
/** @brief Performs validation of memory based on their size.
|
|
*
|
|
* @param __addr The pointer to the memory block to be
|
|
* validated.
|
|
*
|
|
* @detail Validates the memory block passed to this function and
|
|
* appropriately performs the action of managing the free list of
|
|
* blocks by adding this block to the free list or deleting this
|
|
* or larger blocks from the free list.
|
|
*/
|
|
void
|
|
_M_validate(size_t* __addr) throw()
|
|
{
|
|
vector_type& __free_list = _M_get_free_list();
|
|
const vector_type::size_type __max_size = 64;
|
|
if (__free_list.size() >= __max_size)
|
|
{
|
|
// Ok, the threshold value has been reached. We determine
|
|
// which block to remove from the list of free blocks.
|
|
if (*__addr >= *__free_list.back())
|
|
{
|
|
// Ok, the new block is greater than or equal to the
|
|
// last block in the list of free blocks. We just free
|
|
// the new block.
|
|
::operator delete(static_cast<void*>(__addr));
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
// Deallocate the last block in the list of free lists,
|
|
// and insert the new one in it's correct position.
|
|
::operator delete(static_cast<void*>(__free_list.back()));
|
|
__free_list.pop_back();
|
|
}
|
|
}
|
|
|
|
// Just add the block to the list of free lists unconditionally.
|
|
iterator __temp = __gnu_cxx::balloc::__lower_bound
|
|
(__free_list.begin(), __free_list.end(),
|
|
*__addr, _LT_pointer_compare());
|
|
|
|
// We may insert the new free list before _temp;
|
|
__free_list.insert(__temp, __addr);
|
|
}
|
|
|
|
/** @brief Decides whether the wastage of memory is acceptable for
|
|
* the current memory request and returns accordingly.
|
|
*
|
|
* @param __block_size The size of the block available in the free
|
|
* list.
|
|
*
|
|
* @param __required_size The required size of the memory block.
|
|
*
|
|
* @return true if the wastage incurred is acceptable, else returns
|
|
* false.
|
|
*/
|
|
bool
|
|
_M_should_i_give(size_t __block_size,
|
|
size_t __required_size) throw()
|
|
{
|
|
const size_t __max_wastage_percentage = 36;
|
|
if (__block_size >= __required_size &&
|
|
(((__block_size - __required_size) * 100 / __block_size)
|
|
< __max_wastage_percentage))
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
public:
|
|
/** @brief This function returns the block of memory to the
|
|
* internal free list.
|
|
*
|
|
* @param __addr The pointer to the memory block that was given
|
|
* by a call to the _M_get function.
|
|
*/
|
|
inline void
|
|
_M_insert(size_t* __addr) throw()
|
|
{
|
|
#if defined __GTHREADS
|
|
_Auto_Lock __bfl_lock(_M_get_mutex());
|
|
#endif
|
|
// Call _M_validate to decide what should be done with
|
|
// this particular free list.
|
|
this->_M_validate(reinterpret_cast<size_t*>(__addr) - 1);
|
|
// See discussion as to why this is 1!
|
|
}
|
|
|
|
/** @brief This function gets a block of memory of the specified
|
|
* size from the free list.
|
|
*
|
|
* @param __sz The size in bytes of the memory required.
|
|
*
|
|
* @return A pointer to the new memory block of size at least
|
|
* equal to that requested.
|
|
*/
|
|
size_t*
|
|
_M_get(size_t __sz) throw(std::bad_alloc);
|
|
|
|
/** @brief This function just clears the internal Free List, and
|
|
* gives back all the memory to the OS.
|
|
*/
|
|
void
|
|
_M_clear();
|
|
};
|
|
|
|
|
|
// Forward declare the class.
|
|
template<typename _Tp>
|
|
class bitmap_allocator;
|
|
|
|
// Specialize for void:
|
|
template<>
|
|
class bitmap_allocator<void>
|
|
{
|
|
public:
|
|
typedef void* pointer;
|
|
typedef const void* const_pointer;
|
|
|
|
// Reference-to-void members are impossible.
|
|
typedef void value_type;
|
|
template<typename _Tp1>
|
|
struct rebind
|
|
{
|
|
typedef bitmap_allocator<_Tp1> other;
|
|
};
|
|
};
|
|
|
|
template<typename _Tp>
|
|
class bitmap_allocator : private free_list
|
|
{
|
|
public:
|
|
typedef std::size_t size_type;
|
|
typedef std::ptrdiff_t difference_type;
|
|
typedef _Tp* pointer;
|
|
typedef const _Tp* const_pointer;
|
|
typedef _Tp& reference;
|
|
typedef const _Tp& const_reference;
|
|
typedef _Tp value_type;
|
|
template<typename _Tp1>
|
|
struct rebind
|
|
{
|
|
typedef bitmap_allocator<_Tp1> other;
|
|
};
|
|
|
|
private:
|
|
template<size_t _BSize, size_t _AlignSize>
|
|
struct aligned_size
|
|
{
|
|
enum
|
|
{
|
|
modulus = _BSize % _AlignSize,
|
|
value = _BSize + (modulus ? _AlignSize - (modulus) : 0)
|
|
};
|
|
};
|
|
|
|
struct _Alloc_block
|
|
{
|
|
char __M_unused[aligned_size<sizeof(value_type),
|
|
_BALLOC_ALIGN_BYTES>::value];
|
|
};
|
|
|
|
|
|
typedef typename std::pair<_Alloc_block*, _Alloc_block*> _Block_pair;
|
|
|
|
typedef typename
|
|
balloc::__mini_vector<_Block_pair> _BPVector;
|
|
|
|
#if defined _BALLOC_SANITY_CHECK
|
|
// Complexity: O(lg(N)). Where, N is the number of block of size
|
|
// sizeof(value_type).
|
|
void
|
|
_S_check_for_free_blocks() throw()
|
|
{
|
|
typedef typename
|
|
__gnu_cxx::balloc::_Ffit_finder<_Alloc_block*> _FFF;
|
|
_FFF __fff;
|
|
typedef typename _BPVector::iterator _BPiter;
|
|
_BPiter __bpi =
|
|
__gnu_cxx::balloc::__find_if
|
|
(_S_mem_blocks.begin(), _S_mem_blocks.end(),
|
|
__gnu_cxx::balloc::_Functor_Ref<_FFF>(__fff));
|
|
|
|
_BALLOC_ASSERT(__bpi == _S_mem_blocks.end());
|
|
}
|
|
#endif
|
|
|
|
/** @brief Responsible for exponentially growing the internal
|
|
* memory pool.
|
|
*
|
|
* @throw std::bad_alloc. If memory can not be allocated.
|
|
*
|
|
* @detail Complexity: O(1), but internally depends upon the
|
|
* complexity of the function free_list::_M_get. The part where
|
|
* the bitmap headers are written has complexity: O(X),where X
|
|
* is the number of blocks of size sizeof(value_type) within
|
|
* the newly acquired block. Having a tight bound.
|
|
*/
|
|
void
|
|
_S_refill_pool() throw(std::bad_alloc)
|
|
{
|
|
#if defined _BALLOC_SANITY_CHECK
|
|
_S_check_for_free_blocks();
|
|
#endif
|
|
|
|
const size_t __num_bitmaps = (_S_block_size
|
|
/ size_t(balloc::bits_per_block));
|
|
const size_t __size_to_allocate = sizeof(size_t)
|
|
+ _S_block_size * sizeof(_Alloc_block)
|
|
+ __num_bitmaps * sizeof(size_t);
|
|
|
|
size_t* __temp =
|
|
reinterpret_cast<size_t*>
|
|
(this->_M_get(__size_to_allocate));
|
|
*__temp = 0;
|
|
++__temp;
|
|
|
|
// The Header information goes at the Beginning of the Block.
|
|
_Block_pair __bp =
|
|
std::make_pair(reinterpret_cast<_Alloc_block*>
|
|
(__temp + __num_bitmaps),
|
|
reinterpret_cast<_Alloc_block*>
|
|
(__temp + __num_bitmaps)
|
|
+ _S_block_size - 1);
|
|
|
|
// Fill the Vector with this information.
|
|
_S_mem_blocks.push_back(__bp);
|
|
|
|
size_t __bit_mask = 0; // 0 Indicates all Allocated.
|
|
__bit_mask = ~__bit_mask; // 1 Indicates all Free.
|
|
|
|
for (size_t __i = 0; __i < __num_bitmaps; ++__i)
|
|
__temp[__i] = __bit_mask;
|
|
|
|
_S_block_size *= 2;
|
|
}
|
|
|
|
|
|
static _BPVector _S_mem_blocks;
|
|
static size_t _S_block_size;
|
|
static __gnu_cxx::balloc::
|
|
_Bitmap_counter<_Alloc_block*> _S_last_request;
|
|
static typename _BPVector::size_type _S_last_dealloc_index;
|
|
#if defined __GTHREADS
|
|
static _Mutex _S_mut;
|
|
#endif
|
|
|
|
public:
|
|
|
|
/** @brief Allocates memory for a single object of size
|
|
* sizeof(_Tp).
|
|
*
|
|
* @throw std::bad_alloc. If memory can not be allocated.
|
|
*
|
|
* @detail Complexity: Worst case complexity is O(N), but that
|
|
* is hardly ever hit. If and when this particular case is
|
|
* encountered, the next few cases are guaranteed to have a
|
|
* worst case complexity of O(1)! That's why this function
|
|
* performs very well on average. You can consider this
|
|
* function to have a complexity referred to commonly as:
|
|
* Amortized Constant time.
|
|
*/
|
|
pointer
|
|
_M_allocate_single_object() throw(std::bad_alloc)
|
|
{
|
|
#if defined __GTHREADS
|
|
_Auto_Lock __bit_lock(&_S_mut);
|
|
#endif
|
|
|
|
// The algorithm is something like this: The last_request
|
|
// variable points to the last accessed Bit Map. When such a
|
|
// condition occurs, we try to find a free block in the
|
|
// current bitmap, or succeeding bitmaps until the last bitmap
|
|
// is reached. If no free block turns up, we resort to First
|
|
// Fit method.
|
|
|
|
// WARNING: Do not re-order the condition in the while
|
|
// statement below, because it relies on C++'s short-circuit
|
|
// evaluation. The return from _S_last_request->_M_get() will
|
|
// NOT be dereference able if _S_last_request->_M_finished()
|
|
// returns true. This would inevitably lead to a NULL pointer
|
|
// dereference if tinkered with.
|
|
while (_S_last_request._M_finished() == false
|
|
&& (*(_S_last_request._M_get()) == 0))
|
|
{
|
|
_S_last_request.operator++();
|
|
}
|
|
|
|
if (__builtin_expect(_S_last_request._M_finished() == true, false))
|
|
{
|
|
// Fall Back to First Fit algorithm.
|
|
typedef typename
|
|
__gnu_cxx::balloc::_Ffit_finder<_Alloc_block*> _FFF;
|
|
_FFF __fff;
|
|
typedef typename _BPVector::iterator _BPiter;
|
|
_BPiter __bpi =
|
|
__gnu_cxx::balloc::__find_if
|
|
(_S_mem_blocks.begin(), _S_mem_blocks.end(),
|
|
__gnu_cxx::balloc::_Functor_Ref<_FFF>(__fff));
|
|
|
|
if (__bpi != _S_mem_blocks.end())
|
|
{
|
|
// Search was successful. Ok, now mark the first bit from
|
|
// the right as 0, meaning Allocated. This bit is obtained
|
|
// by calling _M_get() on __fff.
|
|
size_t __nz_bit = _Bit_scan_forward(*__fff._M_get());
|
|
balloc::__bit_allocate(__fff._M_get(), __nz_bit);
|
|
|
|
_S_last_request._M_reset(__bpi - _S_mem_blocks.begin());
|
|
|
|
// Now, get the address of the bit we marked as allocated.
|
|
pointer __ret = reinterpret_cast<pointer>
|
|
(__bpi->first + __fff._M_offset() + __nz_bit);
|
|
size_t* __puse_count =
|
|
reinterpret_cast<size_t*>
|
|
(__bpi->first)
|
|
- (__gnu_cxx::balloc::__num_bitmaps(*__bpi) + 1);
|
|
|
|
++(*__puse_count);
|
|
return __ret;
|
|
}
|
|
else
|
|
{
|
|
// Search was unsuccessful. We Add more memory to the
|
|
// pool by calling _S_refill_pool().
|
|
_S_refill_pool();
|
|
|
|
// _M_Reset the _S_last_request structure to the first
|
|
// free block's bit map.
|
|
_S_last_request._M_reset(_S_mem_blocks.size() - 1);
|
|
|
|
// Now, mark that bit as allocated.
|
|
}
|
|
}
|
|
|
|
// _S_last_request holds a pointer to a valid bit map, that
|
|
// points to a free block in memory.
|
|
size_t __nz_bit = _Bit_scan_forward(*_S_last_request._M_get());
|
|
balloc::__bit_allocate(_S_last_request._M_get(), __nz_bit);
|
|
|
|
pointer __ret = reinterpret_cast<pointer>
|
|
(_S_last_request._M_base() + _S_last_request._M_offset() + __nz_bit);
|
|
|
|
size_t* __puse_count = reinterpret_cast<size_t*>
|
|
(_S_mem_blocks[_S_last_request._M_where()].first)
|
|
- (__gnu_cxx::balloc::
|
|
__num_bitmaps(_S_mem_blocks[_S_last_request._M_where()]) + 1);
|
|
|
|
++(*__puse_count);
|
|
return __ret;
|
|
}
|
|
|
|
/** @brief Deallocates memory that belongs to a single object of
|
|
* size sizeof(_Tp).
|
|
*
|
|
* @detail Complexity: O(lg(N)), but the worst case is not hit
|
|
* often! This is because containers usually deallocate memory
|
|
* close to each other and this case is handled in O(1) time by
|
|
* the deallocate function.
|
|
*/
|
|
void
|
|
_M_deallocate_single_object(pointer __p) throw()
|
|
{
|
|
#if defined __GTHREADS
|
|
_Auto_Lock __bit_lock(&_S_mut);
|
|
#endif
|
|
_Alloc_block* __real_p = reinterpret_cast<_Alloc_block*>(__p);
|
|
|
|
typedef typename _BPVector::iterator _Iterator;
|
|
typedef typename _BPVector::difference_type _Difference_type;
|
|
|
|
_Difference_type __diff;
|
|
long __displacement;
|
|
|
|
_BALLOC_ASSERT(_S_last_dealloc_index >= 0);
|
|
|
|
|
|
if (__gnu_cxx::balloc::_Inclusive_between<_Alloc_block*>
|
|
(__real_p)
|
|
(_S_mem_blocks[_S_last_dealloc_index]))
|
|
{
|
|
_BALLOC_ASSERT(_S_last_dealloc_index <= _S_mem_blocks.size() - 1);
|
|
|
|
// Initial Assumption was correct!
|
|
__diff = _S_last_dealloc_index;
|
|
__displacement = __real_p - _S_mem_blocks[__diff].first;
|
|
}
|
|
else
|
|
{
|
|
_Iterator _iter =
|
|
__gnu_cxx::balloc::
|
|
__find_if(_S_mem_blocks.begin(),
|
|
_S_mem_blocks.end(),
|
|
__gnu_cxx::balloc::
|
|
_Inclusive_between<_Alloc_block*>(__real_p));
|
|
|
|
_BALLOC_ASSERT(_iter != _S_mem_blocks.end());
|
|
|
|
__diff = _iter - _S_mem_blocks.begin();
|
|
__displacement = __real_p - _S_mem_blocks[__diff].first;
|
|
_S_last_dealloc_index = __diff;
|
|
}
|
|
|
|
// Get the position of the iterator that has been found.
|
|
const size_t __rotate = (__displacement
|
|
% size_t(balloc::bits_per_block));
|
|
size_t* __bitmapC =
|
|
reinterpret_cast<size_t*>
|
|
(_S_mem_blocks[__diff].first) - 1;
|
|
__bitmapC -= (__displacement / size_t(balloc::bits_per_block));
|
|
|
|
balloc::__bit_free(__bitmapC, __rotate);
|
|
size_t* __puse_count = reinterpret_cast<size_t*>
|
|
(_S_mem_blocks[__diff].first)
|
|
- (__gnu_cxx::balloc::__num_bitmaps(_S_mem_blocks[__diff]) + 1);
|
|
|
|
_BALLOC_ASSERT(*__puse_count != 0);
|
|
|
|
--(*__puse_count);
|
|
|
|
if (__builtin_expect(*__puse_count == 0, false))
|
|
{
|
|
_S_block_size /= 2;
|
|
|
|
// We can safely remove this block.
|
|
// _Block_pair __bp = _S_mem_blocks[__diff];
|
|
this->_M_insert(__puse_count);
|
|
_S_mem_blocks.erase(_S_mem_blocks.begin() + __diff);
|
|
|
|
// Reset the _S_last_request variable to reflect the
|
|
// erased block. We do this to protect future requests
|
|
// after the last block has been removed from a particular
|
|
// memory Chunk, which in turn has been returned to the
|
|
// free list, and hence had been erased from the vector,
|
|
// so the size of the vector gets reduced by 1.
|
|
if ((_Difference_type)_S_last_request._M_where() >= __diff--)
|
|
_S_last_request._M_reset(__diff);
|
|
|
|
// If the Index into the vector of the region of memory
|
|
// that might hold the next address that will be passed to
|
|
// deallocated may have been invalidated due to the above
|
|
// erase procedure being called on the vector, hence we
|
|
// try to restore this invariant too.
|
|
if (_S_last_dealloc_index >= _S_mem_blocks.size())
|
|
{
|
|
_S_last_dealloc_index =(__diff != -1 ? __diff : 0);
|
|
_BALLOC_ASSERT(_S_last_dealloc_index >= 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
public:
|
|
bitmap_allocator() throw()
|
|
{ }
|
|
|
|
bitmap_allocator(const bitmap_allocator&)
|
|
{ }
|
|
|
|
template<typename _Tp1>
|
|
bitmap_allocator(const bitmap_allocator<_Tp1>&) throw()
|
|
{ }
|
|
|
|
~bitmap_allocator() throw()
|
|
{ }
|
|
|
|
pointer
|
|
allocate(size_type __n)
|
|
{
|
|
if (__builtin_expect(__n > this->max_size(), false))
|
|
std::__throw_bad_alloc();
|
|
|
|
if (__builtin_expect(__n == 1, true))
|
|
return this->_M_allocate_single_object();
|
|
else
|
|
{
|
|
const size_type __b = __n * sizeof(value_type);
|
|
return reinterpret_cast<pointer>(::operator new(__b));
|
|
}
|
|
}
|
|
|
|
pointer
|
|
allocate(size_type __n, typename bitmap_allocator<void>::const_pointer)
|
|
{ return allocate(__n); }
|
|
|
|
void
|
|
deallocate(pointer __p, size_type __n) throw()
|
|
{
|
|
if (__builtin_expect(__p != 0, true))
|
|
{
|
|
if (__builtin_expect(__n == 1, true))
|
|
this->_M_deallocate_single_object(__p);
|
|
else
|
|
::operator delete(__p);
|
|
}
|
|
}
|
|
|
|
pointer
|
|
address(reference __r) const
|
|
{ return &__r; }
|
|
|
|
const_pointer
|
|
address(const_reference __r) const
|
|
{ return &__r; }
|
|
|
|
size_type
|
|
max_size() const throw()
|
|
{ return size_type(-1) / sizeof(value_type); }
|
|
|
|
void
|
|
construct(pointer __p, const_reference __data)
|
|
{ ::new(__p) value_type(__data); }
|
|
|
|
void
|
|
destroy(pointer __p)
|
|
{ __p->~value_type(); }
|
|
};
|
|
|
|
template<typename _Tp1, typename _Tp2>
|
|
bool
|
|
operator==(const bitmap_allocator<_Tp1>&,
|
|
const bitmap_allocator<_Tp2>&) throw()
|
|
{ return true; }
|
|
|
|
template<typename _Tp1, typename _Tp2>
|
|
bool
|
|
operator!=(const bitmap_allocator<_Tp1>&,
|
|
const bitmap_allocator<_Tp2>&) throw()
|
|
{ return false; }
|
|
|
|
// Static member definitions.
|
|
template<typename _Tp>
|
|
typename bitmap_allocator<_Tp>::_BPVector
|
|
bitmap_allocator<_Tp>::_S_mem_blocks;
|
|
|
|
template<typename _Tp>
|
|
size_t bitmap_allocator<_Tp>::_S_block_size =
|
|
2 * size_t(balloc::bits_per_block);
|
|
|
|
template<typename _Tp>
|
|
typename __gnu_cxx::bitmap_allocator<_Tp>::_BPVector::size_type
|
|
bitmap_allocator<_Tp>::_S_last_dealloc_index = 0;
|
|
|
|
template<typename _Tp>
|
|
__gnu_cxx::balloc::_Bitmap_counter
|
|
<typename bitmap_allocator<_Tp>::_Alloc_block*>
|
|
bitmap_allocator<_Tp>::_S_last_request(_S_mem_blocks);
|
|
|
|
#if defined __GTHREADS
|
|
template<typename _Tp>
|
|
__gnu_cxx::_Mutex
|
|
bitmap_allocator<_Tp>::_S_mut;
|
|
#endif
|
|
|
|
_GLIBCXX_END_NAMESPACE
|
|
|
|
#endif
|
|
|
|
// LocalWords: namespace GTHREADS bool const gthread endif Mutex mutex
|