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Diffstat (limited to 'nuttx/sched/pthread_setcancelstate.c')
-rw-r--r-- | nuttx/sched/pthread_setcancelstate.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/nuttx/sched/pthread_setcancelstate.c b/nuttx/sched/pthread_setcancelstate.c new file mode 100644 index 000000000..2c6bf3083 --- /dev/null +++ b/nuttx/sched/pthread_setcancelstate.c @@ -0,0 +1,131 @@ +/****************************************************************************************** + * 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; +} |