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114 lines
4.3 KiB
114 lines
4.3 KiB
/************************************************************************ |
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* sched/sched_free.c |
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* |
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* Copyright (C) 2007, 2009, 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 <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 "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 an exception |
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* handler. If this function is called from the IDLE task, then we |
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* must have exclusive access to the memory manager to do this. |
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*/ |
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if (up_interrupt_context() || kmm_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(LPWORK); |
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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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kmm_givesemaphore(); |
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} |
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} |
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