100 lines
2.0 KiB
C++
100 lines
2.0 KiB
C++
/*
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* Copyright (C) 2010 Tim Mayberry <mojofunk@gmail.com>
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* Copyright (C) 2013-2015 Paul Davis <paul@linuxaudiosystems.com>
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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 General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef PBD_ATOMIC_COUNTER_H
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#define PBD_ATOMIC_COUNTER_H
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#include <glib.h>
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namespace PBD {
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class atomic_counter
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{
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/**
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* Prevent copying and assignment
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*/
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atomic_counter (const atomic_counter&);
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atomic_counter& operator= (const atomic_counter&);
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public:
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atomic_counter (gint value = 0)
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:
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m_value(value)
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{ }
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gint get() const
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{
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return g_atomic_int_get (const_cast<gint*>(&m_value));
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}
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void set (gint new_value)
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{
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g_atomic_int_set (&m_value, new_value);
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}
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void increment ()
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{
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g_atomic_int_inc (&m_value);
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}
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void operator++ ()
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{
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increment ();
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}
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bool decrement_and_test ()
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{
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return g_atomic_int_dec_and_test (&m_value);
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}
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bool operator-- ()
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{
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return decrement_and_test ();
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}
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bool compare_and_exchange (gint old_value, gint new_value)
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{
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return g_atomic_int_compare_and_exchange
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(
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&m_value,
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old_value,
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new_value
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);
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}
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/**
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* convenience method, \see compare_and_exchange
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*/
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bool cas (gint old_value, gint new_value)
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{
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return compare_and_exchange (old_value, new_value);
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}
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private:
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// Has to be mutable when using the apple version of gcc.
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gint m_value;
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};
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} // namespace PBD
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#endif // PBD_ATOMIC_COUNTER_H
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