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/****************************************************************************
* arch/mips/src/common/up_exit.c
*
* Copyright (C) 2011, 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sched.h>
#include <syscall.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/arch.h>
#include "os_internal.h"
#include "up_internal.h"
#ifdef CONFIG_DUMP_ON_EXIT
#include <nuttx/fs/fs.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: _up_dumponexit
*
* Description:
* Dump the state of all tasks whenever on task exits. This is debug
* instrumentation that was added to check file-related reference counting
* but could be useful again sometime in the future.
*
****************************************************************************/
#if defined(CONFIG_DUMP_ON_EXIT) && defined(CONFIG_DEBUG)
static void _up_dumponexit(FAR struct tcb_s *tcb, FAR void *arg)
{
#if CONFIG_NFILE_DESCRIPTORS > 0
FAR struct filelist *filelist;
#if CONFIG_NFILE_STREAMS > 0
FAR struct streamlist *streamlist;
#endif
int i;
#endif
sdbg(" TCB=%p name=%s pid=%d\n", tcb, tcb->argv[0], tcb->pid);
sdbg(" priority=%d state=%d\n", tcb->sched_priority, tcb->task_state);
#if CONFIG_NFILE_DESCRIPTORS > 0
filelist = tcb->group->tg_filelist;
for (i = 0; i < CONFIG_NFILE_DESCRIPTORS; i++)
{
struct inode *inode = filelist->fl_files[i].f_inode;
if (inode)
{
sdbg(" fd=%d refcount=%d\n",
i, inode->i_crefs);
}
}
#endif
#if CONFIG_NFILE_STREAMS > 0
streamlist = tcb->group->tg_streamlist;
for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
{
struct file_struct *filep = &streamlist->sl_streams[i];
if (filep->fs_filedes >= 0)
{
#if CONFIG_STDIO_BUFFER_SIZE > 0
sdbg(" fd=%d nbytes=%d\n",
filep->fs_filedes,
filep->fs_bufpos - filep->fs_bufstart);
#else
sdbg(" fd=%d\n", filep->fs_filedes);
#endif
}
}
#endif
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: _exit
*
* Description:
* This function causes the currently executing task to cease
* to exist. This is a special case of task_delete() where the task to
* be deleted is the currently executing task. It is more complex because
* a context switch must be perform to the next ready to run task.
*
****************************************************************************/
void _exit(int status)
{
struct tcb_s* tcb;
/* Disable interrupts. They will be restored when the next
* task is started.
*/
(void)irqsave();
slldbg("TCB=%p exitting\n", g_readytorun.head);
#if defined(CONFIG_DUMP_ON_EXIT) && defined(CONFIG_DEBUG)
slldbg("Other tasks:\n");
sched_foreach(_up_dumponexit, NULL);
#endif
/* Destroy the task at the head of the ready to run list. */
(void)task_exit();
/* Now, perform the context switch to the new ready-to-run task at the
* head of the list.
*/
tcb = (struct tcb_s*)g_readytorun.head;
/* Then switch contexts */
up_fullcontextrestore(tcb->xcp.regs);
/* up_fullcontextrestore() should not return but could if the software
* interrupts are disabled.
*/
PANIC();
}
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