111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
#pragma once
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/**
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* Copyright (C) 2011 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <boost/thread/tss.hpp>
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namespace mongo {
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using boost::thread_specific_ptr;
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/* thread local "value" rather than a pointer
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good for things which have copy constructors (and the copy constructor is fast enough)
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e.g.
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ThreadLocalValue<int> myint;
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*/
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template<class T>
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class ThreadLocalValue {
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public:
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ThreadLocalValue( T def = 0 ) : _default( def ) { }
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T get() const {
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T * val = _val.get();
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if ( val )
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return *val;
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return _default;
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}
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void set( const T& i ) {
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T *v = _val.get();
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if( v ) {
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*v = i;
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return;
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}
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v = new T(i);
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_val.reset( v );
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}
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private:
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boost::thread_specific_ptr<T> _val;
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const T _default;
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};
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#if defined(_WIN32) || (defined(__GNUC__) && defined(__linux__))
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template< class T >
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struct TSP {
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boost::thread_specific_ptr<T> tsp;
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public:
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T* get() const;
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void reset(T* v);
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};
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# if defined(_WIN32)
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# define TSP_DECLARE(T,p) extern TSP<T> p;
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# define TSP_DEFINE(T,p) __declspec( thread ) T* _ ## p; \
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TSP<T> p; \
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template<> T* TSP<T>::get() const { return _ ## p; } \
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void TSP<T>::reset(T* v) { \
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tsp.reset(v); \
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_ ## p = v; \
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}
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# else
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# define TSP_DECLARE(T,p) \
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extern __thread T* _ ## p; \
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template<> inline T* TSP<T>::get() const { return _ ## p; } \
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extern TSP<T> p;
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# define TSP_DEFINE(T,p) \
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__thread T* _ ## p; \
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template<> void TSP<T>::reset(T* v) { \
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tsp.reset(v); \
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_ ## p = v; \
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} \
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TSP<T> p;
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# endif
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#else
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template< class T >
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struct TSP {
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thread_specific_ptr<T> tsp;
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public:
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T* get() const { return tsp.get(); }
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void reset(T* v) { tsp.reset(v); }
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};
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# define TSP_DECLARE(T,p) extern TSP<T> p;
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# define TSP_DEFINE(T,p) TSP<T> p;
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#endif
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}
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