124 lines
4.6 KiB
C
124 lines
4.6 KiB
C
/****************************************************************************
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* up_releasestack.c
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*
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* Copyright (C) 2007-2009, 2013 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 <nuttx/arch.h>
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#include <nuttx/kmalloc.h>
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#include "up_internal.h"
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/****************************************************************************
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* Private Definitions
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****************************************************************************/
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/****************************************************************************
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* Private 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: up_release_stack
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*
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* Description:
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* A task has been stopped. Free all stack related resources retained in
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* the defunct TCB.
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*
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* Input Parmeters
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* - dtcb: The TCB containing information about the stack to be released
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* - ttype: The thread type. This may be one of following (defined in
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* include/nuttx/sched.h):
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*
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* TCB_FLAG_TTYPE_TASK Normal user task
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* TCB_FLAG_TTYPE_PTHREAD User pthread
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* TCB_FLAG_TTYPE_KERNEL Kernel thread
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*
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* This thread type is normally available in the flags field of the TCB,
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* however, there are certain error recovery contexts where the TCB may
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* not be fully initialized when up_release_stack is called.
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*
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* If CONFIG_NUTTX_KERNEL is defined, then this thread type may affect
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* how the stack is freed. For example, kernel thread stacks may have
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* been allocated from protected kernel memory. Stacks for user tasks
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* and threads must have come from memory that is accessible to user
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* code.
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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 up_release_stack(FAR struct tcb_s *dtcb, uint8_t ttype)
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{
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/* Is there a stack allocated? */
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if (dtcb->stack_alloc_ptr)
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{
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#if defined(CONFIG_NUTTX_KERNEL) && defined(CONFIG_MM_KERNEL_HEAP)
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/* Use the kernel allocator if this is a kernel thread */
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if (ttype == TCB_FLAG_TTYPE_KERNEL)
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{
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sched_kfree(dtcb->stack_alloc_ptr);
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}
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else
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#endif
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{
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/* Use the user-space allocator if this is a task or pthread */
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sched_ufree(dtcb->stack_alloc_ptr);
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}
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}
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/* Mark the stack freed */
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dtcb->stack_alloc_ptr = NULL;
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dtcb->adj_stack_size = 0;
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dtcb->adj_stack_ptr = NULL;
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}
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