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Diffstat (limited to 'nuttx/sched/timer_release.c')
-rw-r--r-- | nuttx/sched/timer_release.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/nuttx/sched/timer_release.c b/nuttx/sched/timer_release.c new file mode 100644 index 000000000..ed83b5f53 --- /dev/null +++ b/nuttx/sched/timer_release.c @@ -0,0 +1,159 @@ +/******************************************************************************** + * timer_release.c + * + * Copyright (C) 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 <nuttx/config.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 + ********************************************************************************/ + +/******************************************************************************** + * Name: 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 + ********************************************************************************/ + +/******************************************************************************** + * Name: timer_release + * + * Description: + * timer_release implements the heart of timer_delete. It is private to the + * the OS internals and differs only in that return value of 1 means that the + * timer was not actually deleted. + * + * Parameters: + * timer - The per-thread timer, previously created by the call to + * timer_create(), to be deleted. + * + * Return Value: + * If the call succeeds, timer_release() will return 0 (OK) or 1 (meaning that + * the timer is still valid). Otherwise, the function will return a negated errno: + * + * -EINVAL - The timer specified timerid is not valid. + * + ********************************************************************************/ + +int timer_release(FAR struct posix_timer_s *timer) +{ + /* Some sanity checks */ + + if (!timer) + { + return -EINVAL; + } + + /* Release one reference to timer. Don't delete the timer until the count + * would decrement to zero. + */ + + if (timer->pt_crefs > 1) + { + timer->pt_crefs--; + return 1; + } + + /* 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 */ |