150 lines
4.8 KiB
C
150 lines
4.8 KiB
C
/****************************************************************************
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* sched/timer/timer_release.c
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*
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* Copyright (C) 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 i, 2016n 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 <nuttx/config.h>
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#include <queue.h>
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#include <errno.h>
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#include <nuttx/irq.h>
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#include <nuttx/kmalloc.h>
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#include "timer/timer.h"
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#ifndef CONFIG_DISABLE_POSIX_TIMERS
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: timer_free
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*
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* Description:
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* Remove the timer from the allocated timer list and free it or return it
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* to the free list (depending on whether or not the timer is one of the
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* preallocated timers)
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*
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****************************************************************************/
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static inline void timer_free(struct posix_timer_s *timer)
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{
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irqstate_t flags;
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/* Remove the timer from the allocated list */
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flags = enter_critical_section();
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sq_rem((FAR sq_entry_t *)timer, (FAR sq_queue_t *)&g_alloctimers);
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/* Return it to the free list if it is one of the preallocated timers */
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#if CONFIG_PREALLOC_TIMERS > 0
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if ((timer->pt_flags & PT_FLAGS_PREALLOCATED) != 0)
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{
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sq_addlast((FAR sq_entry_t *)timer, (FAR sq_queue_t *)&g_freetimers);
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leave_critical_section(flags);
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}
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else
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#endif
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{
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/* Otherwise, return it to the heap */
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leave_critical_section(flags);
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sched_kfree(timer);
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}
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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: timer_release
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*
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* Description:
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* timer_release implements the heart of timer_delete. It is private to
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* the OS internals and differs only in that return value of 1 means that
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* the timer was not actually deleted.
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*
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* Parameters:
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* timer - The per-thread timer, previously created by the call to
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* timer_create(), to be deleted.
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*
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* Return Value:
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* If the call succeeds, timer_release() will return 0 (OK) or 1 (meaning
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* that the timer is still valid). Otherwise, the function will return a
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* negated errno value:
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*
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* -EINVAL - The timer specified timerid is not valid.
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*
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****************************************************************************/
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int timer_release(FAR struct posix_timer_s *timer)
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{
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/* Some sanity checks */
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if (!timer)
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{
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return -EINVAL;
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}
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/* Release one reference to timer. Don't delete the timer until the count
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* would decrement to zero.
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*/
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if (timer->pt_crefs > 1)
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{
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timer->pt_crefs--;
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return 1;
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}
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/* Free the underlying watchdog instance (the timer will be canceled by the
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* watchdog logic before it is actually deleted)
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*/
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(void)wd_delete(timer->pt_wdog);
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/* Release the timer structure */
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timer_free(timer);
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return OK;
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}
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#endif /* CONFIG_DISABLE_POSIX_TIMERS */
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