132 lines
4.9 KiB
C
132 lines
4.9 KiB
C
/******************************************************************************************
|
|
* pthread_setcancelstate.c
|
|
*
|
|
* Copyright (C) 2007, 2008 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 <pthread.h>
|
|
#include <errno.h>
|
|
#include "os_internal.h"
|
|
|
|
/******************************************************************************************
|
|
* Private Definitions
|
|
******************************************************************************************/
|
|
|
|
/******************************************************************************************
|
|
* Private Types
|
|
******************************************************************************************/
|
|
|
|
/******************************************************************************************
|
|
* Private Function Prototypes
|
|
******************************************************************************************/
|
|
|
|
/******************************************************************************************
|
|
* Global Variables
|
|
******************************************************************************************/
|
|
|
|
/******************************************************************************************
|
|
* Private Variables
|
|
******************************************************************************************/
|
|
|
|
/******************************************************************************************
|
|
* Private Functions
|
|
******************************************************************************************/
|
|
|
|
/******************************************************************************************
|
|
* Public Functions
|
|
******************************************************************************************/
|
|
|
|
/******************************************************************************************
|
|
* Name: pthread_setcancelstate
|
|
******************************************************************************************/
|
|
|
|
int pthread_setcancelstate(int state, FAR int *oldstate)
|
|
{
|
|
_TCB *tcb = (_TCB*)g_readytorun.head;
|
|
int ret = OK;
|
|
|
|
/* Suppress context changes for a bit so that the flags are stable. (the
|
|
* flags should not change in interrupt handling).
|
|
*/
|
|
|
|
sched_lock();
|
|
|
|
/* Return the current state if so requrested */
|
|
|
|
if (oldstate)
|
|
{
|
|
if ((tcb->flags & TCB_FLAG_NONCANCELABLE) != 0)
|
|
{
|
|
*oldstate = PTHREAD_CANCEL_DISABLE;
|
|
}
|
|
else
|
|
{
|
|
*oldstate = PTHREAD_CANCEL_ENABLE;
|
|
}
|
|
}
|
|
|
|
/* Set the new cancellation state */
|
|
|
|
if (state == PTHREAD_CANCEL_ENABLE)
|
|
{
|
|
unsigned flags = tcb->flags;
|
|
|
|
/* Clear the non-cancelable and cancel pending flags */
|
|
|
|
tcb->flags &= ~(TCB_FLAG_NONCANCELABLE|TCB_FLAG_CANCEL_PENDING);
|
|
|
|
/* If the cancel was pending, then just exit as requested */
|
|
|
|
if (flags & TCB_FLAG_CANCEL_PENDING)
|
|
{
|
|
pthread_exit(PTHREAD_CANCELED);
|
|
}
|
|
}
|
|
else if (state == PTHREAD_CANCEL_DISABLE)
|
|
{
|
|
/* Set the non-cancelable state */
|
|
|
|
tcb->flags |= TCB_FLAG_NONCANCELABLE;
|
|
}
|
|
else
|
|
{
|
|
ret = EINVAL;
|
|
}
|
|
|
|
sched_unlock();
|
|
return ret;
|
|
}
|