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43d8b36518
This was initially copied from glib. How ever I have simplified it to only support proper atomic operations with gcc builtin __sync calls. The backup is pthread_spin_lock(). I have also obviously namespaced the code to qb_. Signed-off-by: Angus Salkeld <asalkeld@redhat.com>
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*
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* Copyright (C) 2009 Hiroyuki Ikezoe
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*
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* This file is part of libqb.
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*
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* libqb is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* libqb 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libqb. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Copied from the glib code base (glib/gatomic-gcc.c) and namespaced
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* for libqb.
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*/
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#include "config.h"
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#include <qb/qbatomic.h>
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void qb_atomic_init(void)
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{
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}
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int32_t qb_atomic_int_exchange_and_add(volatile int32_t QB_GNUC_MAY_ALIAS * atomic,
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int32_t val)
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{
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return __sync_fetch_and_add(atomic, val);
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}
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void qb_atomic_int_add(volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t val)
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{
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__sync_fetch_and_add(atomic, val);
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}
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int32_t qb_atomic_int_compare_and_exchange(volatile int32_t QB_GNUC_MAY_ALIAS * atomic,
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int32_t oldval, int32_t newval)
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{
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return __sync_bool_compare_and_swap(atomic, oldval, newval);
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}
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int32_t qb_atomic_pointer_compare_and_exchange(volatile void* QB_GNUC_MAY_ALIAS * atomic,
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void* oldval, void* newval)
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{
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return __sync_bool_compare_and_swap(atomic, oldval, newval);
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}
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int32_t (qb_atomic_int_get) (volatile int32_t QB_GNUC_MAY_ALIAS * atomic)
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{
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__sync_synchronize();
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return *atomic;
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}
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void (qb_atomic_int_set) (volatile int32_t QB_GNUC_MAY_ALIAS * atomic,
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int32_t newval)
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{
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*atomic = newval;
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__sync_synchronize();
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}
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void* (qb_atomic_pointer_get) (volatile void* QB_GNUC_MAY_ALIAS * atomic)
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{
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__sync_synchronize();
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return (void*)*atomic;
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}
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void (qb_atomic_pointer_set) (volatile void* QB_GNUC_MAY_ALIAS * atomic,
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void* newval)
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{
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*atomic = newval;
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__sync_synchronize();
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}
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