95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
/*
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* Copyright (c) 2010-2011 Juli Mallett. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef COMMON_THREAD_ATOMIC_H
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#define COMMON_THREAD_ATOMIC_H
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template<typename T>
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class Atomic {
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T val_;
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public:
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Atomic(void)
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: val_()
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{ }
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template<typename Ta>
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Atomic(Ta arg)
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: val_(arg)
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{ }
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~Atomic()
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{ }
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T val () const { return val_; }
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bool operator == (T v) const { return (v == val_); }
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bool operator != (T v) const { return (v != val_); }
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/*
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* Note that these are deliberately not operator overloads, to force
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* deliberate use of this class.
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*/
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#if defined(__GNUC__)
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template<typename Ta>
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T add(Ta arg)
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{
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return (__sync_add_and_fetch (&val_, arg));
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}
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template<typename Ta>
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T subtract(Ta arg)
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{
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return (__sync_sub_and_fetch (&val_, arg));
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}
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template<typename Ta>
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T set(Ta arg)
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{
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return (__sync_or_and_fetch (&val_, arg));
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}
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template<typename Ta>
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T mask(Ta arg)
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{
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return (__sync_and_and_fetch (&val_, arg));
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}
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template<typename Ta>
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T clear(Ta arg)
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{
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return (__sync_and_and_fetch (&val_, ~arg));
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}
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template<typename To, typename Tn>
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bool cmpset(To oldval, Tn newval)
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{
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return (__sync_bool_compare_and_swap (&val_, oldval, newval));
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}
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#else
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#error "No support for atomic operations for your compiler. Why not add some?"
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#endif
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};
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#endif /* !COMMON_THREAD_ATOMIC_H */
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