Kyle Delong
a8e3321fbd
We'd like to start using ##mixed## instead of ##var## for attribute types to be consistent with Hack. As a followup to this (once released), we would codemod all ##var## to ##mixed##.
91 linhas
3.1 KiB
C++
91 linhas
3.1 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com) |
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| Copyright (c) 1998-2010 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#include "hphp/runtime/base/shared_string.h"
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namespace HPHP {
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///////////////////////////////////////////////////////////////////////////////
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SharedStringData::InternMap SharedStringData::s_intern;
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SharedStringData::SharedStringData(const std::string &data) : m_data(data) {
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m_count = 1;
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}
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int SharedStringData::decRefCount() const {
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assert(m_count > 0);
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int cur = m_count.fetch_and_decrement() - 1;
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if (cur == 0) {
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// Only left in intern map. While this data is still in the
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// the map we consider this data dying. All new Creates will
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// overwrite the SharedStringData* in the slot and not use this one.
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InternMap::accessor acc;
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bool found = s_intern.find(acc, m_data);
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assert(m_count == 0);
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// May not be found or may not be acc->second if other thread overwrote.
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// Safe to just delete self.
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if (found && acc->second == this) {
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s_intern.erase(acc);
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}
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return 0;
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}
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return 1;
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}
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void SharedStringData::release() {
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delete this;
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}
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const std::string &SharedStringData::getString() const {
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return m_data;
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}
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void SharedStringData::Create(InternMap::accessor &acc,
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const std::string &data) {
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if (s_intern.insert(acc, data)) {
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acc->second = new SharedStringData(acc->first);
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return;
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}
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// Danger is now that the data is dying. We must not acquire a reference
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// if it in that state.
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while (true) {
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int cur = acc->second->m_count;
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if (cur == 0) {
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acc->second = new SharedStringData(acc->first);
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break;
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}
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// Never change refcount of 0 to refcount of 1, impossible
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// to revive a dying SharedStringData.
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if (acc->second->m_count.compare_and_swap(cur + 1, cur) == cur) {
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break;
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}
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// Other thread must have inc/dec ref'd since we got cur
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}
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}
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SharedString &SharedString::operator=(const std::string &data) {
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reset();
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SharedStringData::InternMap::accessor acc;
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SharedStringData::Create(acc, data);
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// Ref count already incremented in Create
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m_px = acc->second;
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return *this;
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}
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///////////////////////////////////////////////////////////////////////////////
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}
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