128 lines
4.5 KiB
C
128 lines
4.5 KiB
C
/************************************************************************
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* sched/on_exit.c
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*
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* Copyright (C) 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 <stdlib.h>
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#include <assert.h>
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#include <unistd.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include "os_internal.h"
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#ifdef CONFIG_SCHED_ONEXIT
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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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* 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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* 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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* Function: atexit
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*
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* Description:
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* Registers a function to be called at program exit.
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* The on_exit() function registers the given function to be called
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* at normal process termination, whether via exit or via return from
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* the program's main(). The function is passed the status argument
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* given to the last call to exit and the arg argument from on_exit().
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*
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* Limitiations in the current implementation:
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*
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* 1. Only a single on_exit function can be registered.
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* 2. on_exit functions are not inherited when a new task is
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* created.
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*
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* Parameters:
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* func
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*
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* Return Value:
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* Zero on success. Non-zero on failure.
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*
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************************************************************************/
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int on_exit(CODE void (*func)(int, FAR void *), FAR void *arg)
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{
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_TCB *tcb = (_TCB*)g_readytorun.head;
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int ret = ERROR;
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/* The following must be atomic */
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sched_lock();
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if (func && !tcb->onexitfunc)
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{
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tcb->onexitfunc = func;
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tdb->onexitarg = arg;
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ret = OK;
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}
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sched_unlock();
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return ret;
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}
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#endif /* CONFIG_SCHED_ATEXIT */
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