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126 lines
3.9 KiB
C++
126 lines
3.9 KiB
C++
/* Copyright (C) 2011-2014 Free Software Foundation, Inc.
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Contributed by Torvald Riegel <triegel@redhat.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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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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#ifndef LIBITM_CONTAINERS_H
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#define LIBITM_CONTAINERS_H 1
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#include "common.h"
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namespace GTM HIDDEN {
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// A simple vector-like container.
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// If alloc_seperate_cl is true, allocations will happen on separate cache
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// lines.
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template <typename T, bool alloc_separate_cl = true>
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class vector
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{
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private:
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size_t m_capacity;
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size_t m_size;
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T* entries;
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// Initial capacity of the vector.
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static const size_t default_initial_capacity = 32;
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// Above that capacity, grow vector by that size for each call.
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static const size_t default_resize_max = 2048;
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// Resize vector to at least this capacity.
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static const size_t default_resize_min = 32;
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// Don't try to copy this vector.
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vector<T, alloc_separate_cl>(const vector<T, alloc_separate_cl>& x);
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public:
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typedef T datatype;
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typedef T* iterator;
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iterator begin() const { return entries; }
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iterator end() const { return entries + m_size; }
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T& operator[] (size_t pos) { return entries[pos]; }
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const T& operator[] (size_t pos) const { return entries[pos]; }
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vector<T, alloc_separate_cl>(size_t initial_size = default_initial_capacity)
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: m_capacity(initial_size),
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m_size(0)
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{
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if (m_capacity > 0)
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entries = (T*) xmalloc(sizeof(T) * m_capacity, alloc_separate_cl);
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else
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entries = 0;
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}
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~vector<T, alloc_separate_cl>() { if (m_capacity) free(entries); }
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void resize(size_t additional_capacity)
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{
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size_t target = m_capacity + additional_capacity;
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if (target > default_resize_max)
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m_capacity = ((target - 1 + default_resize_max) / default_resize_max)
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* default_resize_max;
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else
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while (m_capacity < target)
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m_capacity = m_capacity * 2;
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if (m_capacity < default_resize_min)
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m_capacity = default_resize_min;
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entries = (T*) xrealloc(entries, sizeof(T) * m_capacity, alloc_separate_cl);
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}
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void resize_noinline() __attribute__((noinline)) { resize(1); }
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void resize_noinline(size_t elements) __attribute__((noinline))
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{
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resize(elements);
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}
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size_t size() const { return m_size; }
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size_t capacity() const { return this->capacity; }
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void set_size (size_t size) { m_size = size; }
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void clear() { m_size = 0; }
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iterator push() {
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// We don't want inlining here since push() is often on the fast path.
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if (unlikely(m_size == m_capacity)) resize_noinline();
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return &entries[m_size++];
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}
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iterator push(size_t elements)
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{
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// We don't want inlining here since push() is often on the fast path.
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if (unlikely(m_size + elements > m_capacity)) resize_noinline(elements);
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iterator it = &entries[m_size];
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m_size += elements;
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return it;
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}
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iterator pop() {
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if (likely(m_size > 0))
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{
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m_size--;
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return entries + m_size;
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}
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else return 0;
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}
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};
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} // namespace GTM
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#endif // LIBITM_CONTAINERS_H
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