118 lines
4.3 KiB
C
118 lines
4.3 KiB
C
/************************************************************************
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* sched/sched_free.c
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*
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* Copyright (C) 2007, 2009 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 <queue.h>
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#include <assert.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/arch.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/mm.h>
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#include "os_internal.h"
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/************************************************************************
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* 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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* Global 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 Function Prototypes
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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_free
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*
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* Description:
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* This function performs deallocations that the operating system may
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* need to make. This special interface to free is used to handling
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* corner cases where the operating system may have to perform
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* deallocations from within an interrupt handler.
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*
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************************************************************************/
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void sched_free(FAR void *address)
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{
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/* Check if this is an attempt to deallocate memory from
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* an exception handler. If this function is called from the
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* IDLE task, then we must have exclusive access to the memory
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* manager to do this.
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*/
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if (up_interrupt_context() || mm_trysemaphore() != 0)
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{
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/* Yes.. Delay the deallocation until a more appropriate time. */
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irqstate_t saved_state = irqsave();
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sq_addlast((FAR sq_entry_t*)address, (sq_queue_t*)&g_delayeddeallocations);
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/* Signal the worker thread that is has some clean up to do */
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#ifdef CONFIG_SCHED_WORKQUEUE
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work_signal();
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#endif
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irqrestore(saved_state);
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}
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else
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{
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/* No.. just deallocate the memory now. */
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kfree(address);
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mm_givesemaphore();
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}
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}
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