5d51b87af4
* src/pool_allocator.cc (_M_get_free_list, _M_get_mutex): Mark throw () * src/mt_allocator.cc (_M_reclaim_block, _M_reclaim_block, _M_destroy_thread_key): Mark throw () * debug.cc (_M_get_mutex, _M_attach_single, _M_detach_single, _M_singular, _M_can_compare _M_get_mutex, _M_message, _M_get_max_length): Mark throw (). * include/debug/formatter.h (_M_message, _M_format_word, _M_get_max_length): Mark throw (). * include/debug/safe_base.h (_M_get_mutex, _M_attach_single, _M_detach_single): Mark throw (). (_M_singular, _M_can_compare, _M_get_mutex): Mark pure and throw (). * include/ext/pool_allocator.h (_M_get_free_list): Mark const and throw () (_M_get_mutex): Mark throw (). * include/ext/mt_allocator.h (_M_reclaim_block): Mark throw (); (_M_destroy_thread_key): Mark CONST and throw. * include/bits/stl_list.h (swap, transfer, reverse, hook, unhook): Mark throw (). From-SVN: r146330
816 lines
25 KiB
C++
816 lines
25 KiB
C++
// Allocator details.
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// Copyright (C) 2004, 2005, 2006, 2009 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 3, 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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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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//
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// ISO C++ 14882:
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//
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#include <bits/c++config.h>
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#include <ext/concurrence.h>
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#include <ext/mt_allocator.h>
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#include <cstring>
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namespace
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{
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#ifdef __GTHREADS
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struct __freelist
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{
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typedef __gnu_cxx::__pool<true>::_Thread_record _Thread_record;
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_Thread_record* _M_thread_freelist;
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_Thread_record* _M_thread_freelist_array;
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size_t _M_max_threads;
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__gthread_key_t _M_key;
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~__freelist()
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{
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if (_M_thread_freelist_array)
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{
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__gthread_key_delete(_M_key);
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::operator delete(static_cast<void*>(_M_thread_freelist_array));
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}
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}
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};
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__freelist&
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get_freelist()
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{
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static __freelist freelist;
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return freelist;
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}
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__gnu_cxx::__mutex&
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get_freelist_mutex()
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{
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static __gnu_cxx::__mutex freelist_mutex;
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return freelist_mutex;
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}
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static void
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_M_destroy_thread_key(void* __id)
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{
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// Return this thread id record to the front of thread_freelist.
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__freelist& freelist = get_freelist();
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{
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__gnu_cxx::__scoped_lock sentry(get_freelist_mutex());
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size_t _M_id = reinterpret_cast<size_t>(__id);
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typedef __gnu_cxx::__pool<true>::_Thread_record _Thread_record;
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_Thread_record* __tr = &freelist._M_thread_freelist_array[_M_id - 1];
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__tr->_M_next = freelist._M_thread_freelist;
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freelist._M_thread_freelist = __tr;
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}
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}
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#endif
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} // anonymous namespace
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_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
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void
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__pool<false>::_M_destroy() throw()
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{
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if (_M_init && !_M_options._M_force_new)
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{
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for (size_t __n = 0; __n < _M_bin_size; ++__n)
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{
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_Bin_record& __bin = _M_bin[__n];
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while (__bin._M_address)
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{
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_Block_address* __tmp = __bin._M_address->_M_next;
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::operator delete(__bin._M_address->_M_initial);
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__bin._M_address = __tmp;
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}
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::operator delete(__bin._M_first);
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}
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::operator delete(_M_bin);
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::operator delete(_M_binmap);
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}
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}
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void
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__pool<false>::_M_reclaim_block(char* __p, size_t __bytes) throw ()
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{
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// Round up to power of 2 and figure out which bin to use.
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const size_t __which = _M_binmap[__bytes];
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_Bin_record& __bin = _M_bin[__which];
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char* __c = __p - _M_get_align();
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_Block_record* __block = reinterpret_cast<_Block_record*>(__c);
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// Single threaded application - return to global pool.
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__block->_M_next = __bin._M_first[0];
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__bin._M_first[0] = __block;
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}
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char*
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__pool<false>::_M_reserve_block(size_t __bytes, const size_t __thread_id)
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{
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// Round up to power of 2 and figure out which bin to use.
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const size_t __which = _M_binmap[__bytes];
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_Bin_record& __bin = _M_bin[__which];
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const _Tune& __options = _M_get_options();
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const size_t __bin_size = (__options._M_min_bin << __which)
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+ __options._M_align;
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size_t __block_count = __options._M_chunk_size - sizeof(_Block_address);
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__block_count /= __bin_size;
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// Get a new block dynamically, set it up for use.
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void* __v = ::operator new(__options._M_chunk_size);
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_Block_address* __address = static_cast<_Block_address*>(__v);
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__address->_M_initial = __v;
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__address->_M_next = __bin._M_address;
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__bin._M_address = __address;
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char* __c = static_cast<char*>(__v) + sizeof(_Block_address);
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_Block_record* __block = reinterpret_cast<_Block_record*>(__c);
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__bin._M_first[__thread_id] = __block;
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while (--__block_count > 0)
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{
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__c += __bin_size;
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__block->_M_next = reinterpret_cast<_Block_record*>(__c);
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__block = __block->_M_next;
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}
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__block->_M_next = NULL;
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__block = __bin._M_first[__thread_id];
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__bin._M_first[__thread_id] = __block->_M_next;
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// NB: For alignment reasons, we can't use the first _M_align
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// bytes, even when sizeof(_Block_record) < _M_align.
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return reinterpret_cast<char*>(__block) + __options._M_align;
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}
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void
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__pool<false>::_M_initialize()
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{
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// _M_force_new must not change after the first allocate(), which
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// in turn calls this method, so if it's false, it's false forever
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// and we don't need to return here ever again.
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if (_M_options._M_force_new)
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{
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_M_init = true;
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return;
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}
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// Create the bins.
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// Calculate the number of bins required based on _M_max_bytes.
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// _M_bin_size is statically-initialized to one.
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size_t __bin_size = _M_options._M_min_bin;
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while (_M_options._M_max_bytes > __bin_size)
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{
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__bin_size <<= 1;
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++_M_bin_size;
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}
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// Setup the bin map for quick lookup of the relevant bin.
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const size_t __j = (_M_options._M_max_bytes + 1) * sizeof(_Binmap_type);
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_M_binmap = static_cast<_Binmap_type*>(::operator new(__j));
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_Binmap_type* __bp = _M_binmap;
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_Binmap_type __bin_max = _M_options._M_min_bin;
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_Binmap_type __bint = 0;
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for (_Binmap_type __ct = 0; __ct <= _M_options._M_max_bytes; ++__ct)
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{
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if (__ct > __bin_max)
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{
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__bin_max <<= 1;
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++__bint;
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}
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*__bp++ = __bint;
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}
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// Initialize _M_bin and its members.
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void* __v = ::operator new(sizeof(_Bin_record) * _M_bin_size);
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_M_bin = static_cast<_Bin_record*>(__v);
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for (size_t __n = 0; __n < _M_bin_size; ++__n)
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{
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_Bin_record& __bin = _M_bin[__n];
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__v = ::operator new(sizeof(_Block_record*));
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__bin._M_first = static_cast<_Block_record**>(__v);
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__bin._M_first[0] = NULL;
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__bin._M_address = NULL;
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}
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_M_init = true;
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}
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#ifdef __GTHREADS
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void
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__pool<true>::_M_destroy() throw()
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{
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if (_M_init && !_M_options._M_force_new)
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{
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if (__gthread_active_p())
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{
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for (size_t __n = 0; __n < _M_bin_size; ++__n)
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{
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_Bin_record& __bin = _M_bin[__n];
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while (__bin._M_address)
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{
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_Block_address* __tmp = __bin._M_address->_M_next;
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::operator delete(__bin._M_address->_M_initial);
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__bin._M_address = __tmp;
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}
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::operator delete(__bin._M_first);
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::operator delete(__bin._M_free);
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::operator delete(__bin._M_used);
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::operator delete(__bin._M_mutex);
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}
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}
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else
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{
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for (size_t __n = 0; __n < _M_bin_size; ++__n)
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{
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_Bin_record& __bin = _M_bin[__n];
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while (__bin._M_address)
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{
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_Block_address* __tmp = __bin._M_address->_M_next;
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::operator delete(__bin._M_address->_M_initial);
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__bin._M_address = __tmp;
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}
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::operator delete(__bin._M_first);
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}
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}
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::operator delete(_M_bin);
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::operator delete(_M_binmap);
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}
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}
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void
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__pool<true>::_M_reclaim_block(char* __p, size_t __bytes) throw ()
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{
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// Round up to power of 2 and figure out which bin to use.
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const size_t __which = _M_binmap[__bytes];
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const _Bin_record& __bin = _M_bin[__which];
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// Know __p not null, assume valid block.
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char* __c = __p - _M_get_align();
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_Block_record* __block = reinterpret_cast<_Block_record*>(__c);
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if (__gthread_active_p())
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{
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// Calculate the number of records to remove from our freelist:
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// in order to avoid too much contention we wait until the
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// number of records is "high enough".
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const size_t __thread_id = _M_get_thread_id();
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const _Tune& __options = _M_get_options();
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const size_t __limit = (100 * (_M_bin_size - __which)
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* __options._M_freelist_headroom);
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size_t __remove = __bin._M_free[__thread_id];
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__remove *= __options._M_freelist_headroom;
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// NB: We assume that reads of _Atomic_words are atomic.
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const size_t __max_threads = __options._M_max_threads + 1;
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_Atomic_word* const __reclaimed_base =
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reinterpret_cast<_Atomic_word*>(__bin._M_used + __max_threads);
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const _Atomic_word __reclaimed = __reclaimed_base[__thread_id];
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const size_t __net_used = __bin._M_used[__thread_id] - __reclaimed;
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// NB: For performance sake we don't resync every time, in order
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// to spare atomic ops. Note that if __reclaimed increased by,
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// say, 1024, since the last sync, it means that the other
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// threads executed the atomic in the else below at least the
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// same number of times (at least, because _M_reserve_block may
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// have decreased the counter), therefore one more cannot hurt.
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if (__reclaimed > 1024)
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{
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__bin._M_used[__thread_id] -= __reclaimed;
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__atomic_add(&__reclaimed_base[__thread_id], -__reclaimed);
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}
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if (__remove >= __net_used)
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__remove -= __net_used;
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else
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__remove = 0;
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if (__remove > __limit && __remove > __bin._M_free[__thread_id])
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{
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_Block_record* __first = __bin._M_first[__thread_id];
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_Block_record* __tmp = __first;
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__remove /= __options._M_freelist_headroom;
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const size_t __removed = __remove;
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while (--__remove > 0)
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__tmp = __tmp->_M_next;
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__bin._M_first[__thread_id] = __tmp->_M_next;
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__bin._M_free[__thread_id] -= __removed;
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__gthread_mutex_lock(__bin._M_mutex);
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__tmp->_M_next = __bin._M_first[0];
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__bin._M_first[0] = __first;
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__bin._M_free[0] += __removed;
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__gthread_mutex_unlock(__bin._M_mutex);
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}
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// Return this block to our list and update counters and
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// owner id as needed.
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if (__block->_M_thread_id == __thread_id)
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--__bin._M_used[__thread_id];
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else
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__atomic_add(&__reclaimed_base[__block->_M_thread_id], 1);
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__block->_M_next = __bin._M_first[__thread_id];
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__bin._M_first[__thread_id] = __block;
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++__bin._M_free[__thread_id];
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}
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else
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{
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// Not using threads, so single threaded application - return
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// to global pool.
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__block->_M_next = __bin._M_first[0];
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__bin._M_first[0] = __block;
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}
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}
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char*
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__pool<true>::_M_reserve_block(size_t __bytes, const size_t __thread_id)
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{
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// Round up to power of 2 and figure out which bin to use.
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const size_t __which = _M_binmap[__bytes];
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const _Tune& __options = _M_get_options();
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const size_t __bin_size = ((__options._M_min_bin << __which)
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+ __options._M_align);
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size_t __block_count = __options._M_chunk_size - sizeof(_Block_address);
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__block_count /= __bin_size;
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// Are we using threads?
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// - Yes, check if there are free blocks on the global
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// list. If so, grab up to __block_count blocks in one
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// lock and change ownership. If the global list is
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// empty, we allocate a new chunk and add those blocks
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// directly to our own freelist (with us as owner).
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// - No, all operations are made directly to global pool 0
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// no need to lock or change ownership but check for free
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// blocks on global list (and if not add new ones) and
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// get the first one.
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_Bin_record& __bin = _M_bin[__which];
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_Block_record* __block = NULL;
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if (__gthread_active_p())
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{
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// Resync the _M_used counters.
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const size_t __max_threads = __options._M_max_threads + 1;
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_Atomic_word* const __reclaimed_base =
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reinterpret_cast<_Atomic_word*>(__bin._M_used + __max_threads);
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const _Atomic_word __reclaimed = __reclaimed_base[__thread_id];
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__bin._M_used[__thread_id] -= __reclaimed;
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__atomic_add(&__reclaimed_base[__thread_id], -__reclaimed);
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__gthread_mutex_lock(__bin._M_mutex);
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if (__bin._M_first[0] == NULL)
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{
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void* __v = ::operator new(__options._M_chunk_size);
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_Block_address* __address = static_cast<_Block_address*>(__v);
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__address->_M_initial = __v;
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__address->_M_next = __bin._M_address;
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__bin._M_address = __address;
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__gthread_mutex_unlock(__bin._M_mutex);
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// No need to hold the lock when we are adding a whole
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// chunk to our own list.
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char* __c = static_cast<char*>(__v) + sizeof(_Block_address);
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__block = reinterpret_cast<_Block_record*>(__c);
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__bin._M_free[__thread_id] = __block_count;
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__bin._M_first[__thread_id] = __block;
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while (--__block_count > 0)
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{
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__c += __bin_size;
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__block->_M_next = reinterpret_cast<_Block_record*>(__c);
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__block = __block->_M_next;
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}
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__block->_M_next = NULL;
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}
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else
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{
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// Is the number of required blocks greater than or equal
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// to the number that can be provided by the global free
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// list?
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__bin._M_first[__thread_id] = __bin._M_first[0];
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if (__block_count >= __bin._M_free[0])
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{
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__bin._M_free[__thread_id] = __bin._M_free[0];
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__bin._M_free[0] = 0;
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__bin._M_first[0] = NULL;
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}
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else
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{
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__bin._M_free[__thread_id] = __block_count;
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__bin._M_free[0] -= __block_count;
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__block = __bin._M_first[0];
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while (--__block_count > 0)
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__block = __block->_M_next;
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__bin._M_first[0] = __block->_M_next;
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__block->_M_next = NULL;
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}
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__gthread_mutex_unlock(__bin._M_mutex);
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}
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}
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else
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{
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void* __v = ::operator new(__options._M_chunk_size);
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_Block_address* __address = static_cast<_Block_address*>(__v);
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__address->_M_initial = __v;
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__address->_M_next = __bin._M_address;
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__bin._M_address = __address;
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char* __c = static_cast<char*>(__v) + sizeof(_Block_address);
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__block = reinterpret_cast<_Block_record*>(__c);
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__bin._M_first[0] = __block;
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while (--__block_count > 0)
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{
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__c += __bin_size;
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__block->_M_next = reinterpret_cast<_Block_record*>(__c);
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__block = __block->_M_next;
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}
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__block->_M_next = NULL;
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}
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__block = __bin._M_first[__thread_id];
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__bin._M_first[__thread_id] = __block->_M_next;
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if (__gthread_active_p())
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{
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__block->_M_thread_id = __thread_id;
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--__bin._M_free[__thread_id];
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++__bin._M_used[__thread_id];
|
|
}
|
|
|
|
// NB: For alignment reasons, we can't use the first _M_align
|
|
// bytes, even when sizeof(_Block_record) < _M_align.
|
|
return reinterpret_cast<char*>(__block) + __options._M_align;
|
|
}
|
|
|
|
void
|
|
__pool<true>::_M_initialize()
|
|
{
|
|
// _M_force_new must not change after the first allocate(),
|
|
// which in turn calls this method, so if it's false, it's false
|
|
// forever and we don't need to return here ever again.
|
|
if (_M_options._M_force_new)
|
|
{
|
|
_M_init = true;
|
|
return;
|
|
}
|
|
|
|
// Create the bins.
|
|
// Calculate the number of bins required based on _M_max_bytes.
|
|
// _M_bin_size is statically-initialized to one.
|
|
size_t __bin_size = _M_options._M_min_bin;
|
|
while (_M_options._M_max_bytes > __bin_size)
|
|
{
|
|
__bin_size <<= 1;
|
|
++_M_bin_size;
|
|
}
|
|
|
|
// Setup the bin map for quick lookup of the relevant bin.
|
|
const size_t __j = (_M_options._M_max_bytes + 1) * sizeof(_Binmap_type);
|
|
_M_binmap = static_cast<_Binmap_type*>(::operator new(__j));
|
|
_Binmap_type* __bp = _M_binmap;
|
|
_Binmap_type __bin_max = _M_options._M_min_bin;
|
|
_Binmap_type __bint = 0;
|
|
for (_Binmap_type __ct = 0; __ct <= _M_options._M_max_bytes; ++__ct)
|
|
{
|
|
if (__ct > __bin_max)
|
|
{
|
|
__bin_max <<= 1;
|
|
++__bint;
|
|
}
|
|
*__bp++ = __bint;
|
|
}
|
|
|
|
// Initialize _M_bin and its members.
|
|
void* __v = ::operator new(sizeof(_Bin_record) * _M_bin_size);
|
|
_M_bin = static_cast<_Bin_record*>(__v);
|
|
|
|
// If __gthread_active_p() create and initialize the list of
|
|
// free thread ids. Single threaded applications use thread id 0
|
|
// directly and have no need for this.
|
|
if (__gthread_active_p())
|
|
{
|
|
__freelist& freelist = get_freelist();
|
|
{
|
|
__gnu_cxx::__scoped_lock sentry(get_freelist_mutex());
|
|
|
|
if (!freelist._M_thread_freelist_array
|
|
|| freelist._M_max_threads < _M_options._M_max_threads)
|
|
{
|
|
const size_t __k = sizeof(_Thread_record)
|
|
* _M_options._M_max_threads;
|
|
__v = ::operator new(__k);
|
|
_M_thread_freelist = static_cast<_Thread_record*>(__v);
|
|
|
|
// NOTE! The first assignable thread id is 1 since the
|
|
// global pool uses id 0
|
|
size_t __i;
|
|
for (__i = 1; __i < _M_options._M_max_threads; ++__i)
|
|
{
|
|
_Thread_record& __tr = _M_thread_freelist[__i - 1];
|
|
__tr._M_next = &_M_thread_freelist[__i];
|
|
__tr._M_id = __i;
|
|
}
|
|
|
|
// Set last record.
|
|
_M_thread_freelist[__i - 1]._M_next = NULL;
|
|
_M_thread_freelist[__i - 1]._M_id = __i;
|
|
|
|
if (!freelist._M_thread_freelist_array)
|
|
{
|
|
// Initialize per thread key to hold pointer to
|
|
// _M_thread_freelist.
|
|
__gthread_key_create(&freelist._M_key,
|
|
::_M_destroy_thread_key);
|
|
freelist._M_thread_freelist = _M_thread_freelist;
|
|
}
|
|
else
|
|
{
|
|
_Thread_record* _M_old_freelist
|
|
= freelist._M_thread_freelist;
|
|
_Thread_record* _M_old_array
|
|
= freelist._M_thread_freelist_array;
|
|
freelist._M_thread_freelist
|
|
= &_M_thread_freelist[_M_old_freelist - _M_old_array];
|
|
while (_M_old_freelist)
|
|
{
|
|
size_t next_id;
|
|
if (_M_old_freelist->_M_next)
|
|
next_id = _M_old_freelist->_M_next - _M_old_array;
|
|
else
|
|
next_id = freelist._M_max_threads;
|
|
_M_thread_freelist[_M_old_freelist->_M_id - 1]._M_next
|
|
= &_M_thread_freelist[next_id];
|
|
_M_old_freelist = _M_old_freelist->_M_next;
|
|
}
|
|
::operator delete(static_cast<void*>(_M_old_array));
|
|
}
|
|
freelist._M_thread_freelist_array = _M_thread_freelist;
|
|
freelist._M_max_threads = _M_options._M_max_threads;
|
|
}
|
|
}
|
|
|
|
const size_t __max_threads = _M_options._M_max_threads + 1;
|
|
for (size_t __n = 0; __n < _M_bin_size; ++__n)
|
|
{
|
|
_Bin_record& __bin = _M_bin[__n];
|
|
__v = ::operator new(sizeof(_Block_record*) * __max_threads);
|
|
std::memset(__v, 0, sizeof(_Block_record*) * __max_threads);
|
|
__bin._M_first = static_cast<_Block_record**>(__v);
|
|
|
|
__bin._M_address = NULL;
|
|
|
|
__v = ::operator new(sizeof(size_t) * __max_threads);
|
|
std::memset(__v, 0, sizeof(size_t) * __max_threads);
|
|
|
|
__bin._M_free = static_cast<size_t*>(__v);
|
|
|
|
__v = ::operator new(sizeof(size_t) * __max_threads
|
|
+ sizeof(_Atomic_word) * __max_threads);
|
|
std::memset(__v, 0, (sizeof(size_t) * __max_threads
|
|
+ sizeof(_Atomic_word) * __max_threads));
|
|
__bin._M_used = static_cast<size_t*>(__v);
|
|
|
|
__v = ::operator new(sizeof(__gthread_mutex_t));
|
|
__bin._M_mutex = static_cast<__gthread_mutex_t*>(__v);
|
|
|
|
#ifdef __GTHREAD_MUTEX_INIT
|
|
{
|
|
// Do not copy a POSIX/gthr mutex once in use.
|
|
__gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
|
|
*__bin._M_mutex = __tmp;
|
|
}
|
|
#else
|
|
{ __GTHREAD_MUTEX_INIT_FUNCTION(__bin._M_mutex); }
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (size_t __n = 0; __n < _M_bin_size; ++__n)
|
|
{
|
|
_Bin_record& __bin = _M_bin[__n];
|
|
__v = ::operator new(sizeof(_Block_record*));
|
|
__bin._M_first = static_cast<_Block_record**>(__v);
|
|
__bin._M_first[0] = NULL;
|
|
__bin._M_address = NULL;
|
|
}
|
|
}
|
|
_M_init = true;
|
|
}
|
|
|
|
size_t
|
|
__pool<true>::_M_get_thread_id()
|
|
{
|
|
// If we have thread support and it's active we check the thread
|
|
// key value and return its id or if it's not set we take the
|
|
// first record from _M_thread_freelist and sets the key and
|
|
// returns its id.
|
|
if (__gthread_active_p())
|
|
{
|
|
__freelist& freelist = get_freelist();
|
|
void* v = __gthread_getspecific(freelist._M_key);
|
|
size_t _M_id = (size_t)v;
|
|
if (_M_id == 0)
|
|
{
|
|
{
|
|
__gnu_cxx::__scoped_lock sentry(get_freelist_mutex());
|
|
if (freelist._M_thread_freelist)
|
|
{
|
|
_M_id = freelist._M_thread_freelist->_M_id;
|
|
freelist._M_thread_freelist
|
|
= freelist._M_thread_freelist->_M_next;
|
|
}
|
|
}
|
|
|
|
__gthread_setspecific(freelist._M_key, (void*)_M_id);
|
|
}
|
|
return _M_id >= _M_options._M_max_threads ? 0 : _M_id;
|
|
}
|
|
|
|
// Otherwise (no thread support or inactive) all requests are
|
|
// served from the global pool 0.
|
|
return 0;
|
|
}
|
|
|
|
// XXX GLIBCXX_ABI Deprecated
|
|
void
|
|
__pool<true>::_M_destroy_thread_key(void*) throw () { }
|
|
|
|
// XXX GLIBCXX_ABI Deprecated
|
|
void
|
|
__pool<true>::_M_initialize(__destroy_handler)
|
|
{
|
|
// _M_force_new must not change after the first allocate(),
|
|
// which in turn calls this method, so if it's false, it's false
|
|
// forever and we don't need to return here ever again.
|
|
if (_M_options._M_force_new)
|
|
{
|
|
_M_init = true;
|
|
return;
|
|
}
|
|
|
|
// Create the bins.
|
|
// Calculate the number of bins required based on _M_max_bytes.
|
|
// _M_bin_size is statically-initialized to one.
|
|
size_t __bin_size = _M_options._M_min_bin;
|
|
while (_M_options._M_max_bytes > __bin_size)
|
|
{
|
|
__bin_size <<= 1;
|
|
++_M_bin_size;
|
|
}
|
|
|
|
// Setup the bin map for quick lookup of the relevant bin.
|
|
const size_t __j = (_M_options._M_max_bytes + 1) * sizeof(_Binmap_type);
|
|
_M_binmap = static_cast<_Binmap_type*>(::operator new(__j));
|
|
_Binmap_type* __bp = _M_binmap;
|
|
_Binmap_type __bin_max = _M_options._M_min_bin;
|
|
_Binmap_type __bint = 0;
|
|
for (_Binmap_type __ct = 0; __ct <= _M_options._M_max_bytes; ++__ct)
|
|
{
|
|
if (__ct > __bin_max)
|
|
{
|
|
__bin_max <<= 1;
|
|
++__bint;
|
|
}
|
|
*__bp++ = __bint;
|
|
}
|
|
|
|
// Initialize _M_bin and its members.
|
|
void* __v = ::operator new(sizeof(_Bin_record) * _M_bin_size);
|
|
_M_bin = static_cast<_Bin_record*>(__v);
|
|
|
|
// If __gthread_active_p() create and initialize the list of
|
|
// free thread ids. Single threaded applications use thread id 0
|
|
// directly and have no need for this.
|
|
if (__gthread_active_p())
|
|
{
|
|
__freelist& freelist = get_freelist();
|
|
{
|
|
__gnu_cxx::__scoped_lock sentry(get_freelist_mutex());
|
|
|
|
if (!freelist._M_thread_freelist_array
|
|
|| freelist._M_max_threads < _M_options._M_max_threads)
|
|
{
|
|
const size_t __k = sizeof(_Thread_record)
|
|
* _M_options._M_max_threads;
|
|
__v = ::operator new(__k);
|
|
_M_thread_freelist = static_cast<_Thread_record*>(__v);
|
|
|
|
// NOTE! The first assignable thread id is 1 since the
|
|
// global pool uses id 0
|
|
size_t __i;
|
|
for (__i = 1; __i < _M_options._M_max_threads; ++__i)
|
|
{
|
|
_Thread_record& __tr = _M_thread_freelist[__i - 1];
|
|
__tr._M_next = &_M_thread_freelist[__i];
|
|
__tr._M_id = __i;
|
|
}
|
|
|
|
// Set last record.
|
|
_M_thread_freelist[__i - 1]._M_next = NULL;
|
|
_M_thread_freelist[__i - 1]._M_id = __i;
|
|
|
|
if (!freelist._M_thread_freelist_array)
|
|
{
|
|
// Initialize per thread key to hold pointer to
|
|
// _M_thread_freelist.
|
|
__gthread_key_create(&freelist._M_key,
|
|
::_M_destroy_thread_key);
|
|
freelist._M_thread_freelist = _M_thread_freelist;
|
|
}
|
|
else
|
|
{
|
|
_Thread_record* _M_old_freelist
|
|
= freelist._M_thread_freelist;
|
|
_Thread_record* _M_old_array
|
|
= freelist._M_thread_freelist_array;
|
|
freelist._M_thread_freelist
|
|
= &_M_thread_freelist[_M_old_freelist - _M_old_array];
|
|
while (_M_old_freelist)
|
|
{
|
|
size_t next_id;
|
|
if (_M_old_freelist->_M_next)
|
|
next_id = _M_old_freelist->_M_next - _M_old_array;
|
|
else
|
|
next_id = freelist._M_max_threads;
|
|
_M_thread_freelist[_M_old_freelist->_M_id - 1]._M_next
|
|
= &_M_thread_freelist[next_id];
|
|
_M_old_freelist = _M_old_freelist->_M_next;
|
|
}
|
|
::operator delete(static_cast<void*>(_M_old_array));
|
|
}
|
|
freelist._M_thread_freelist_array = _M_thread_freelist;
|
|
freelist._M_max_threads = _M_options._M_max_threads;
|
|
}
|
|
}
|
|
|
|
const size_t __max_threads = _M_options._M_max_threads + 1;
|
|
for (size_t __n = 0; __n < _M_bin_size; ++__n)
|
|
{
|
|
_Bin_record& __bin = _M_bin[__n];
|
|
__v = ::operator new(sizeof(_Block_record*) * __max_threads);
|
|
std::memset(__v, 0, sizeof(_Block_record*) * __max_threads);
|
|
__bin._M_first = static_cast<_Block_record**>(__v);
|
|
|
|
__bin._M_address = NULL;
|
|
|
|
__v = ::operator new(sizeof(size_t) * __max_threads);
|
|
std::memset(__v, 0, sizeof(size_t) * __max_threads);
|
|
__bin._M_free = static_cast<size_t*>(__v);
|
|
|
|
__v = ::operator new(sizeof(size_t) * __max_threads +
|
|
sizeof(_Atomic_word) * __max_threads);
|
|
std::memset(__v, 0, (sizeof(size_t) * __max_threads
|
|
+ sizeof(_Atomic_word) * __max_threads));
|
|
__bin._M_used = static_cast<size_t*>(__v);
|
|
|
|
__v = ::operator new(sizeof(__gthread_mutex_t));
|
|
__bin._M_mutex = static_cast<__gthread_mutex_t*>(__v);
|
|
|
|
#ifdef __GTHREAD_MUTEX_INIT
|
|
{
|
|
// Do not copy a POSIX/gthr mutex once in use.
|
|
__gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
|
|
*__bin._M_mutex = __tmp;
|
|
}
|
|
#else
|
|
{ __GTHREAD_MUTEX_INIT_FUNCTION(__bin._M_mutex); }
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (size_t __n = 0; __n < _M_bin_size; ++__n)
|
|
{
|
|
_Bin_record& __bin = _M_bin[__n];
|
|
__v = ::operator new(sizeof(_Block_record*));
|
|
__bin._M_first = static_cast<_Block_record**>(__v);
|
|
__bin._M_first[0] = NULL;
|
|
__bin._M_address = NULL;
|
|
}
|
|
}
|
|
_M_init = true;
|
|
}
|
|
#endif
|
|
|
|
// Instantiations.
|
|
template class __mt_alloc<char>;
|
|
template class __mt_alloc<wchar_t>;
|
|
|
|
_GLIBCXX_END_NAMESPACE
|