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author | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
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committer | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
commit | 8a365179eafdf3aea98e60ab9f5882b200d4c759 (patch) | |
tree | 4f38d6d4cd80bd0b6e22e2bb534c3f117ce44e56 /nuttx/sched/timer_initialize.c | |
download | px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.gz px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.bz2 px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.zip |
Fresh import of the PX4 firmware sources.
Diffstat (limited to 'nuttx/sched/timer_initialize.c')
-rw-r--r-- | nuttx/sched/timer_initialize.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/nuttx/sched/timer_initialize.c b/nuttx/sched/timer_initialize.c new file mode 100644 index 000000000..05980bb1a --- /dev/null +++ b/nuttx/sched/timer_initialize.c @@ -0,0 +1,168 @@ +/******************************************************************************** + * timer_initialize.c + * + * Copyright (C) 2007, 2009 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 <nuttx/compiler.h> + +#include <sys/types.h> +#include <time.h> +#include <queue.h> +#include <errno.h> + +#include "timer_internal.h" + +#ifndef CONFIG_DISABLE_POSIX_TIMERS + +/******************************************************************************** + * Definitions + ********************************************************************************/ + +/******************************************************************************** + * Private Data + ********************************************************************************/ + +/* These are the preallocated times */ + +#if CONFIG_PREALLOC_TIMERS > 0 +static struct posix_timer_s g_prealloctimers[CONFIG_PREALLOC_TIMERS]; +#endif + +/******************************************************************************** + * Public Data + ********************************************************************************/ + +/* This is a list of free, preallocated timer structures */ + +#if CONFIG_PREALLOC_TIMERS > 0 +volatile sq_queue_t g_freetimers; +#endif + +/* This is a list of instantiated timer structures -- active and inactive. The + * timers are place on this list by timer_create() and removed from the list by + * timer_delete() or when the owning thread exits. + */ + +volatile sq_queue_t g_alloctimers; + +/******************************************************************************** + * Private Functions + ********************************************************************************/ + +/******************************************************************************** + * Public Functions + ********************************************************************************/ + +/******************************************************************************** + * Name: timer_initialize + * + * Description: + * Boot up configuration of the POSIX timer facility. + * + * Parameters: + * None + * + * Return Value: + * None + * + * Assumptions: + * + ********************************************************************************/ + +void weak_function timer_initialize(void) +{ +#if CONFIG_PREALLOC_TIMERS > 0 + int i; + + /* Place all of the pre-allocated timers into the free timer list */ + + sq_init((sq_queue_t*)&g_freetimers); + + for (i = 0; i < CONFIG_PREALLOC_TIMERS; i++) + { + g_prealloctimers[i].pt_flags = PT_FLAGS_PREALLOCATED; + sq_addlast((FAR sq_entry_t*)&g_prealloctimers[i], (FAR sq_queue_t*)&g_freetimers); + } +#endif + + /* Initialize the list of allocated timers */ + + sq_init((sq_queue_t*)&g_alloctimers); +} + +/******************************************************************************** + * Name: timer_deleteall + * + * Description: + * This function is called whenever a thread exits. Any timers owned by that + * thread are deleted as though called by timer_delete(). + * + * It is provided in this file so that it can be weakly defined but also, + * like timer_intitialize(), be brought into the link whenever the timer + * resources are referenced. + * + * Parameters: + * pid - the task ID of the thread that exitted + * + * Return Value: + * None + * + * Assumptions: + * + ********************************************************************************/ + +void weak_function timer_deleteall(pid_t pid) +{ + FAR struct posix_timer_s *timer; + FAR struct posix_timer_s *next; + irqstate_t flags; + + flags = irqsave(); + for (timer = (FAR struct posix_timer_s*)g_alloctimers.head; timer; timer = next) + { + next = timer->flink; + if (timer->pt_owner == pid) + { + timer_delete((timer_t)timer); + } + } + + irqrestore(flags); +} + +#endif /* CONFIG_DISABLE_POSIX_TIMERS */ |