forked from Archive/PX4-Autopilot
117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/****************************************************************************
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* mm/mm_grancritical.c
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*
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* Copyright (C) 2012 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 <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include <arch/irq.h>
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#include <nuttx/gran.h>
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#include "mm_gran.h"
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#ifdef CONFIG_GRAN
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: gran_enter_critical and gran_leave_critical
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*
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* Description:
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* Critical section management for the granule allocator.
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*
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* Input Parameters:
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* priv - Pointer to the gran state
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void gran_enter_critical(FAR struct gran_s *priv)
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{
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#ifdef CONFIG_GRAN_INTR
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priv->irqstate = irqsave();
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#else
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int ret;
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/* Continue waiting if we are awakened by a signal */
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do
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{
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ret = sem_wait(&priv->exclsem);
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if (ret < 0)
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{
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DEBUGASSERT(errno == EINTR);
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}
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}
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while (ret < 0);
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#endif
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}
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void gran_leave_critical(FAR struct gran_s *priv)
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{
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#ifdef CONFIG_GRAN_INTR
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irqrestore(priv->irqstate);
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#else
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sem_post(&priv->exclsem);
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#endif
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}
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#endif /* CONFIG_GRAN */
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