118 lines
4.5 KiB
C
118 lines
4.5 KiB
C
/****************************************************************************
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* sched/sched_garbage.c
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*
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* Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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/kmalloc.h>
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#include "os_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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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: sched_garbagecollection
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*
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* Description:
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* Clean-up memory de-allocations that we queued because they could not
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* be freed in that execution context (for example, if the memory was freed
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* from an interrupt handler).
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*
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* This logic may be called from the worker thread (see work_thread.c).
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* If, however, CONFIG_SCHED_WORKQUEUE is not defined, then this logic will
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* be called from the IDLE thread. It is less optimal for the garbage
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* collection to be called from the IDLE thread because it runs at a very
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* low priority and could cause false memory out conditions.
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*
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* Input parameters:
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* None
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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 sched_garbagecollection(void)
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{
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irqstate_t flags;
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void *address;
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/* Test if the delayed deallocation queue is empty. No special protection
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* is needed because this is an atomic test.
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*/
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while (g_delayeddeallocations.head)
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{
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/* Remove the first delayed deallocation. This is not atomic and so
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* we must disable interrupts around the queue operation.
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*/
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flags = irqsave();
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address = (void*)sq_remfirst((FAR sq_queue_t*)&g_delayeddeallocations);
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irqrestore(flags);
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/* Then deallocate it. */
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if (address)
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{
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kfree(address);
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}
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}
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}
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