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/* |
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* Copyright (C) 2005-2008 by Pieter Palmers |
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* |
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* This file is part of FFADO |
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* FFADO = Free Firewire (pro-)audio drivers for linux |
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* |
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* FFADO is based upon FreeBoB |
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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) version 3 of the License. |
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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 |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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*/ |
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/* |
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* Copied from the jackd/jackdmp sources |
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* function names changed in order to avoid naming problems when using this in |
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* a jackd backend. |
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*/ |
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/* Original license: |
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* |
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* Copyright (C) 2004-2006 Grame |
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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) version 3 of the License. |
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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 |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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*/ |
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#ifndef __FFADOATOMIC__ |
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#define __FFADOATOMIC__ |
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#include <stdint.h> |
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static inline char CAS(volatile uint32_t value, uint32_t newvalue, volatile int32_t* addr) |
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{ |
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return __sync_bool_compare_and_swap (addr, value, newvalue); |
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} |
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static inline long INC_ATOMIC(volatile int32_t* val) |
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{ |
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int32_t actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, actual + 1, val)); |
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return actual; |
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} |
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static inline long DEC_ATOMIC(volatile int32_t* val) |
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{ |
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int32_t actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, actual - 1, val)); |
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return actual; |
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} |
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static inline long ADD_ATOMIC(volatile int32_t* val, int32_t addval) |
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{ |
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int32_t actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, actual + addval, val)); |
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return actual; |
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} |
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static inline long SUBSTRACT_ATOMIC(volatile int32_t* val, int32_t addval) |
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{ |
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int32_t actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, actual - addval, val)); |
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return actual; |
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} |
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static inline long ZERO_ATOMIC(volatile int32_t* val) |
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{ |
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int32_t actual; |
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do { |
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actual = *val; |
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} while (!CAS(actual, 0, val)); |
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return actual; |
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} |
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#endif // __FFADO_ATOMIC__ |
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