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/********************************************************************************
* timer_delete.c
*
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <time.h>
#include <queue.h>
#include <errno.h>
#include <nuttx/kmalloc.h>
#include "timer_internal.h"
#ifndef CONFIG_DISABLE_POSIX_TIMERS
/********************************************************************************
* Definitions
********************************************************************************/
/********************************************************************************
* Private Data
********************************************************************************/
/********************************************************************************
* Public Data
********************************************************************************/
/********************************************************************************
* Private Functions
********************************************************************************/
/********************************************************************************
* Function: timer_free
*
* Description:
* Remove the timer from the allocated timer list and free it or return it to
* the free list (depending on whether or not the timer is one of the
* preallocated timers)
*
********************************************************************************/
static inline void timer_free(struct posix_timer_s *timer)
{
irqstate_t flags;
/* Remove the timer from the allocated list */
flags = irqsave();
sq_rem((FAR sq_entry_t*)timer, (sq_queue_t*)&g_alloctimers);
/* Return it to the free list if it is one of the preallocated timers */
#if CONFIG_PREALLOC_TIMERS > 0
if ((timer->pt_flags & PT_FLAGS_PREALLOCATED) != 0)
{
sq_addlast((FAR sq_entry_t*)timer, (FAR sq_queue_t*)&g_freetimers);
irqrestore(flags);
}
else
#endif
{
/* Otherwise, return it to the heap */
irqrestore(flags);
sched_free(timer);
}
}
/********************************************************************************
* Public Functions
********************************************************************************/
/********************************************************************************
* Function: timer_delete
*
* Description:
* The timer_delete() function deletes the specified timer, timerid, previously
* created by the timer_create() function. If the timer is armed when
* timer_delete() is called, the timer will be automatically disarmed before
* removal. The disposition of pending signals for the deleted timer is unspecified.
*
* Parameters:
* timerid - The pre-thread timer, previously created by the call to
* timer_create(), to be deleted.
*
* Return Value:
* If the call succeeds, timer_create() will return 0 (OK). Otherwise, the
* function will return a value of -1 (ERROR) and set errno to indicate the error.
*
* EINVAL - The timer specified timerid is not valid.
*
* Assumptions:
*
********************************************************************************/
int timer_delete(timer_t timerid)
{
FAR struct posix_timer_s *timer = (FAR struct posix_timer_s *)timerid;
/* Some sanity checks */
if (!timer)
{
*get_errno_ptr() = EINVAL;
return ERROR;
}
/* If the watchdog structure is busy now, then just mark it for deletion later */
if ((timer->pt_flags & PT_FLAGS_BUSY) != 0)
{
timer->pt_flags |= PT_FLAGS_DELETED;
}
else
{
/* Free the underlying watchdog instance (the timer will be canceled by the
* watchdog logic before it is actually deleted)
*/
(void)wd_delete(timer->pt_wdog);
/* Release the timer structure */
timer_free(timer);
}
return OK;
}
#endif /* CONFIG_DISABLE_POSIX_TIMERS */
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