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131 lines
4.9 KiB
131 lines
4.9 KiB
/****************************************************************************************** |
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* 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 <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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/****************************************************************************************** |
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* Name: pthread_setcancelstate |
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******************************************************************************************/ |
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int pthread_setcancelstate(int state, FAR 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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