b08a86171f
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/**************************************************************************
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* pthread_setcancelstate.c
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*
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* Copyright (C) 2007 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 Gregory Nutt 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 <pthread.h>
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#include <errno.h>
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#include "os_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 Types
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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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* 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 Functions
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**************************************************************************/
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/**************************************************************************
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* Public Functions
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**************************************************************************/
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int pthread_setcancelstate(int state, int *oldstate)
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{
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_TCB *tcb = (_TCB*)g_readytorun.head;
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int ret = OK;
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/* Suppress context changes for a bit so that the flags are stable. (the
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* flags should not change in interrupt handling).
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*/
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sched_lock();
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/* Return the current state if so requrested */
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if (oldstate)
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{
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if ((tcb->flags & TCB_FLAG_NONCANCELABLE) != 0)
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{
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*oldstate = PTHREAD_CANCEL_DISABLE;
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}
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else
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{
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*oldstate = PTHREAD_CANCEL_ENABLE;
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}
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}
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/* Set the new cancellation state */
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if (state == PTHREAD_CANCEL_ENABLE)
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{
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unsigned flags = tcb->flags;
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/* Clear the non-cancelable and cancel pending flags */
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tcb->flags &= ~(TCB_FLAG_NONCANCELABLE|TCB_FLAG_CANCEL_PENDING);
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/* If the cancel was pending, then just exit as requested */
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if (flags & TCB_FLAG_CANCEL_PENDING)
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{
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pthread_exit(PTHREAD_CANCELED);
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}
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}
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else if (state == PTHREAD_CANCEL_DISABLE)
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{
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/* Set the non-cancelable state */
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tcb->flags |= TCB_FLAG_NONCANCELABLE;
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}
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else
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{
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ret = EINVAL;
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}
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sched_unlock();
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return ret;
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}
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