148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/****************************************************************************
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* wireless/bluetooth/bt_atomic.c
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* Linux like atomic operations
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/irq.h>
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#include "bt_atomic.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#ifndef CONFIG_HAVE_INLINE
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void bt_atomic_set(FAR bt_atomic_t *ptr, bt_atomic_t value)
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{
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*ptr = value;
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}
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#endif
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bt_atomic_t bt_atomic_incr(FAR bt_atomic_t *ptr)
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{
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irqstate_t flags;
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bt_atomic_t value;
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flags = spin_lock_irqsave();
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value = *ptr;
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*ptr = value + 1;
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spin_unlock_irqrestore(flags);
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return value;
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}
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bt_atomic_t bt_atomic_decr(FAR bt_atomic_t *ptr)
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{
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irqstate_t flags;
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bt_atomic_t value;
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flags = spin_lock_irqsave();
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value = *ptr;
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*ptr = value - 1;
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spin_unlock_irqrestore(flags);
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return value;
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}
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bt_atomic_t bt_atomic_setbit(FAR bt_atomic_t *ptr, bt_atomic_t bitno)
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{
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irqstate_t flags;
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bt_atomic_t value;
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flags = spin_lock_irqsave();
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value = *ptr;
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*ptr = value | (1 << bitno);
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spin_unlock_irqrestore(flags);
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return value;
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}
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bt_atomic_t bt_atomic_clrbit(FAR bt_atomic_t *ptr, bt_atomic_t bitno)
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{
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irqstate_t flags;
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bt_atomic_t value;
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flags = spin_lock_irqsave();
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value = *ptr;
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*ptr = value & ~(1 << bitno);
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spin_unlock_irqrestore(flags);
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return value;
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}
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#ifndef CONFIG_HAVE_INLINE
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bt_atomic_t bt_atomic_get(FAR bt_atomic_t *ptr)
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{
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return *ptr;
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}
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#endif
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#ifndef CONFIG_HAVE_INLINE
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bool bt_atomic_testbit(FAR bt_atomic_t *ptr, bt_atomic_t bitno)
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{
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return (*ptr & (1 << bitno)) != 0;
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}
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#endif
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bool bt_atomic_testsetbit(FAR bt_atomic_t *ptr, bt_atomic_t bitno)
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{
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irqstate_t flags;
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bt_atomic_t value;
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flags = spin_lock_irqsave();
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value = *ptr;
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*ptr = value | (1 << bitno);
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spin_unlock_irqrestore(flags);
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return (value & (1 << bitno)) != 0;
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}
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bool bt_atomic_testclrbit(FAR bt_atomic_t *ptr, bt_atomic_t bitno)
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{
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irqstate_t flags;
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bt_atomic_t value;
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flags = spin_lock_irqsave();
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value = *ptr;
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*ptr = value & ~(1 << bitno);
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spin_unlock_irqrestore(flags);
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return (value & (1 << bitno)) != 0;
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}
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