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Diffstat (limited to 'nuttx/sched/mqueue/mq_recover.c')
-rw-r--r-- | nuttx/sched/mqueue/mq_recover.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/nuttx/sched/mqueue/mq_recover.c b/nuttx/sched/mqueue/mq_recover.c new file mode 100644 index 000000000..4ba587b50 --- /dev/null +++ b/nuttx/sched/mqueue/mq_recover.c @@ -0,0 +1,118 @@ +/************************************************************************ + * sched/mqueue/mq_recover.c + * + * Copyright (C) 2012 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 <nuttx/config.h> + +#include <assert.h> + +#include <nuttx/mqueue.h> +#include <nuttx/sched.h> + +#include "mqueue/mqueue.h" + +/************************************************************************ + * Definitions + ************************************************************************/ + +/************************************************************************ + * Private Type Declarations + ************************************************************************/ + +/************************************************************************ + * Global Variables + ************************************************************************/ + +/************************************************************************ + * Private Variables + ************************************************************************/ + +/************************************************************************ + * Private Functions + ************************************************************************/ + +/************************************************************************ + * Public Functions + ************************************************************************/ + +/************************************************************************ + * Name: mq_recover + * + * Description: + * This function is called when a task is deleted via task_deleted or + * via pthread_cancel. I checks if the task was waiting for a message + * queue event and adjusts counts appropriately. + * + * Inputs: + * tcb - The TCB of the terminated task or thread + * + * Return Value: + * None. + * + * Assumptions: + * This function is called from task deletion logic in a safe context. + * + ************************************************************************/ + +void mq_recover(FAR struct tcb_s *tcb) +{ + /* If were were waiting for a timed message queue event, then the + * timer was canceled and deleted in task_recover() before this + * function was called. + */ + + /* Was the task waiting for a message queue to become non-empty? */ + + if (tcb->task_state == TSTATE_WAIT_MQNOTEMPTY) + { + /* Decrement the count of waiters */ + + DEBUGASSERT(tcb->msgwaitq && tcb->msgwaitq->nwaitnotempty > 0); + tcb->msgwaitq->nwaitnotempty--; + } + + /* Was the task waiting for a message queue to become non-full? */ + + else if (tcb->task_state == TSTATE_WAIT_MQNOTFULL) + { + /* Decrement the count of waiters */ + + DEBUGASSERT(tcb->msgwaitq && tcb->msgwaitq->nwaitnotfull > 0); + tcb->msgwaitq->nwaitnotfull--; + } +} |