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// -*- c++ -*-
#pragma once
#include "moses/Util.h"
#ifdef WITH_THREADS
#include <time.h>
#include <boost/thread.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include "moses/TargetPhrase.h"
#include <boost/thread/shared_mutex.hpp>
#include <boost/thread/locks.hpp>
#include <map>
namespace Moses
{
// todo: replace this with thread lock-free containers, if a stable library can
// be found somewhere
template<typename KEY, typename VAL, class CONTAINER = std::map<KEY,VAL> >
class
ThreadSafeContainer
{
protected:
mutable boost::shared_mutex m_lock;
CONTAINER m_container;
typedef typename CONTAINER::iterator iter_t;
typedef typename CONTAINER::const_iterator const_iter_t;
typedef typename CONTAINER::value_type entry_t;
public:
class locking_iterator
{
boost::unique_lock<boost::shared_mutex> m_lock;
CONTAINER const* m_container;
const_iter_t m_iter;
locking_iterator(locking_iterator const& other); // no copies!
public:
locking_iterator() : m_container(NULL) { }
locking_iterator(boost::shared_mutex& lock,
CONTAINER const* container,
const_iter_t const& iter)
: m_lock(lock), m_container(container), m_iter(iter)
{ }
entry_t const& operator->() {
UTIL_THROW_IF2(m_container == NULL, "This locking iterator is invalid "
<< "or has not been assigned.");
return m_iter.operator->();
}
// locking operators transfer the lock upon assignment and become invalid
locking_iterator const&
operator=(locking_iterator& other) {
m_lock.swap(other.m_lock);
m_iter = other.m_iter;
other.m_iter = other.m_container.end();
}
bool
operator==(const_iter_t const& other) {
return m_iter == other;
}
locking_iterator const&
operator++() {
++m_iter;
return *this;
}
// DO NOT DEFINE THE POST-INCREMENT OPERATOR!
// locking_operators are non-copyable,
// so we can't simply make a copy before incrementing and return
// the copy after incrementing
locking_iterator const&
operator++(int);
};
const_iter_t const& end() const {
return m_container.end();
}
locking_iterator begin() const {
return locking_iterator(m_lock, this, m_container.begin());
}
VAL const& set(KEY const& key, VAL const& val) {
boost::unique_lock< boost::shared_mutex > lock(m_lock);
entry_t entry(key,val);
iter_t foo = m_container.insert(entry).first;
foo->second = val;
return foo->second;
}
VAL const* get(KEY const& key, VAL const& default_val) {
boost::shared_lock< boost::shared_mutex > lock(m_lock);
entry_t entry(key, default_val);
iter_t foo = m_container.insert(entry).first;
return &(foo->second);
}
VAL const* get(KEY const& key) const {
boost::shared_lock< boost::shared_mutex > lock(m_lock);
const_iter_t m = m_container.find(key);
if (m == m_container.end()) return NULL;
return &m->second;
}
size_t erase(KEY const& key) {
boost::unique_lock< boost::shared_mutex > lock(m_lock);
return m_container.erase(key);
}
};
}
#endif
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