| /* Copyright (C) 2011-2022 Free Software Foundation, Inc. |
| Contributed by Torvald Riegel <triegel@redhat.com>. |
| |
| This file is part of the GNU Transactional Memory Library (libitm). |
| |
| Libitm is free software; you can redistribute it and/or modify it |
| under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| Libitm is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| more details. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef LIBITM_CONTAINERS_H |
| #define LIBITM_CONTAINERS_H 1 |
| |
| #include "common.h" |
| |
| namespace GTM HIDDEN { |
| |
| // A simple vector-like container. |
| // If alloc_seperate_cl is true, allocations will happen on separate cache |
| // lines. |
| template <typename T, bool alloc_separate_cl = true> |
| class vector |
| { |
| private: |
| size_t m_capacity; |
| size_t m_size; |
| T* entries; |
| |
| // Initial capacity of the vector. |
| static const size_t default_initial_capacity = 32; |
| // Above that capacity, grow vector by that size for each call. |
| static const size_t default_resize_max = 2048; |
| // Resize vector to at least this capacity. |
| static const size_t default_resize_min = 32; |
| |
| // Don't try to copy this vector. |
| vector<T, alloc_separate_cl>(const vector<T, alloc_separate_cl>& x); |
| |
| public: |
| typedef T datatype; |
| typedef T* iterator; |
| |
| iterator begin() const { return entries; } |
| iterator end() const { return entries + m_size; } |
| T& operator[] (size_t pos) { return entries[pos]; } |
| const T& operator[] (size_t pos) const { return entries[pos]; } |
| |
| vector<T, alloc_separate_cl>(size_t initial_size = default_initial_capacity) |
| : m_capacity(initial_size), |
| m_size(0) |
| { |
| if (m_capacity > 0) |
| entries = (T*) xmalloc(sizeof(T) * m_capacity, alloc_separate_cl); |
| else |
| entries = 0; |
| } |
| ~vector<T, alloc_separate_cl>() { if (m_capacity) free(entries); } |
| |
| void resize(size_t additional_capacity) |
| { |
| size_t target = m_capacity + additional_capacity; |
| if (target > default_resize_max) |
| m_capacity = ((target - 1 + default_resize_max) / default_resize_max) |
| * default_resize_max; |
| else |
| while (m_capacity < target) |
| m_capacity = m_capacity * 2; |
| if (m_capacity < default_resize_min) |
| m_capacity = default_resize_min; |
| entries = (T*) xrealloc(entries, sizeof(T) * m_capacity, alloc_separate_cl); |
| } |
| void resize_noinline() __attribute__((noinline)) { resize(1); } |
| void resize_noinline(size_t elements) __attribute__((noinline)) |
| { |
| resize(elements); |
| } |
| |
| size_t size() const { return m_size; } |
| size_t capacity() const { return this->capacity; } |
| |
| void set_size (size_t size) { m_size = size; } |
| void clear() { m_size = 0; } |
| |
| iterator push() { |
| // We don't want inlining here since push() is often on the fast path. |
| if (unlikely(m_size == m_capacity)) resize_noinline(); |
| return &entries[m_size++]; |
| } |
| |
| iterator push(size_t elements) |
| { |
| // We don't want inlining here since push() is often on the fast path. |
| if (unlikely(m_size + elements > m_capacity)) resize_noinline(elements); |
| iterator it = &entries[m_size]; |
| m_size += elements; |
| return it; |
| } |
| |
| iterator pop() { |
| if (likely(m_size > 0)) |
| { |
| m_size--; |
| return entries + m_size; |
| } |
| else return 0; |
| } |
| }; |
| |
| } // namespace GTM |
| |
| #endif // LIBITM_CONTAINERS_H |