lean2/src/kernel/threadsafe_environment.h

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/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#pragma once
#include "util/shared_mutex.h"
#include "kernel/environment.h"
namespace lean {
/**
\brief The environment object is not thread safe.
The helper classes \c read_only_environment and \c read_write_environment
provides thread safe access to the environment object.
\remark We do not use these classes internally.
They are only used for implementing external APIs.
*/
class read_only_environment {
environment m_env;
shared_lock m_lock;
public:
read_only_environment(environment const & env);
~read_only_environment();
operator environment const &() const { return m_env; }
environment const * operator->() const { return &m_env; }
};
/**
\brief See \c read_only_environment
*/
class read_write_environment {
environment m_env;
unique_lock m_lock;
public:
read_write_environment(environment const & env);
~read_write_environment();
operator environment &() { return m_env; }
environment * operator->() { return &m_env; }
};
}