145 lines
4.7 KiB
C
145 lines
4.7 KiB
C
/****************************************************************************
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* sched/pthread/pthread_setcancelstate.c
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*
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* Copyright (C) 2007, 2008 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 <pthread.h>
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#include <errno.h>
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#include "task/task.h"
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#include "sched/sched.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_setcancelstate
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*
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* Description:
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* The pthread_setcancelstate() function atomically both sets the calling
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* thread's cancelability state to the indicated state and returns the
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* previous cancelability state at the location referenced by oldstate.
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* Legal values for state are PTHREAD_CANCEL_ENABLE and
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* PTHREAD_CANCEL_DISABLE.
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*
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* The cancelability state and type of any newly created threads,
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* including the thread in which main() was first invoked, are
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* PTHREAD_CANCEL_ENABLE and PTHREAD_CANCEL_DEFERRED respectively.
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*
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****************************************************************************/
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int pthread_setcancelstate(int state, FAR int *oldstate)
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{
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FAR struct tcb_s *tcb = this_task();
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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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/* Clear the non-cancelable flag */
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tcb->flags &= ~TCB_FLAG_NONCANCELABLE;
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/* Check if a cancellation was pending */
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if ((tcb->flags & TCB_FLAG_CANCEL_PENDING) != 0)
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{
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#ifdef CONFIG_CANCELLATION_POINTS
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/* If we are using deferred cancellation? */
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if ((tcb->flags & TCB_FLAG_CANCEL_DEFERRED) != 0)
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{
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/* Yes.. If we are within a cancellation point, then
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* notify of the cancellation.
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*/
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if (tcb->cpcount > 0)
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{
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notify_cancellation(tcb);
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}
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}
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else
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#endif
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{
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/* No.. We are using asynchronous cancellation. If the
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* cancellation was pending in this case, then just exit.
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*/
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tcb->flags &= ~TCB_FLAG_CANCEL_PENDING;
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pthread_exit(PTHREAD_CANCELED);
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}
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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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