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-rw-r--r--nuttx/sched/work_thread.c256
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diff --git a/nuttx/sched/work_thread.c b/nuttx/sched/work_thread.c
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-/****************************************************************************
- * sched/work_thread.c
- *
- * Copyright (C) 2009-2012 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 <stdint.h>
-#include <unistd.h>
-#include <queue.h>
-#include <assert.h>
-#include <errno.h>
-#include <debug.h>
-
-#include <nuttx/arch.h>
-#include <nuttx/wqueue.h>
-#include <nuttx/clock.h>
-
-#include "os_internal.h"
-#include "work_internal.h"
-
-#ifdef CONFIG_SCHED_WORKQUEUE
-
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
-
-/****************************************************************************
- * Private Type Declarations
- ****************************************************************************/
-
-/****************************************************************************
- * Public Variables
- ****************************************************************************/
-
-/* The state of each work queue */
-
-struct wqueue_s g_work[NWORKERS];
-
-/****************************************************************************
- * Private Variables
- ****************************************************************************/
-
-/****************************************************************************
- * Private Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: work_process
- *
- * Description:
- * This is the logic that performs actions placed on any work list.
- *
- * Input parameters:
- * wqueue - Describes the work queue to be processed
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
-
-static void work_process(FAR struct wqueue_s *wqueue)
-{
- volatile FAR struct work_s *work;
- worker_t worker;
- irqstate_t flags;
- FAR void *arg;
- uint32_t elapsed;
- uint32_t remaining;
- uint32_t next;
-
- /* Then process queued work. We need to keep interrupts disabled while
- * we process items in the work list.
- */
-
- next = CONFIG_SCHED_WORKPERIOD / USEC_PER_TICK;
- flags = irqsave();
- work = (FAR struct work_s *)wqueue->q.head;
- while (work)
- {
- /* Is this work ready? It is ready if there is no delay or if
- * the delay has elapsed. qtime is the time that the work was added
- * to the work queue. It will always be greater than or equal to
- * zero. Therefore a delay of zero will always execute immediately.
- */
-
- elapsed = clock_systimer() - work->qtime;
- if (elapsed >= work->delay)
- {
- /* Remove the ready-to-execute work from the list */
-
- (void)dq_rem((struct dq_entry_s *)work, &wqueue->q);
-
- /* Extract the work description from the entry (in case the work
- * instance by the re-used after it has been de-queued).
- */
-
- worker = work->worker;
- arg = work->arg;
-
- /* Mark the work as no longer being queued */
-
- work->worker = NULL;
-
- /* Do the work. Re-enable interrupts while the work is being
- * performed... we don't have any idea how long that will take!
- */
-
- irqrestore(flags);
- worker(arg);
-
- /* Now, unfortunately, since we re-enabled interrupts we don't
- * know the state of the work list and we will have to start
- * back at the head of the list.
- */
-
- flags = irqsave();
- work = (FAR struct work_s *)wqueue->q.head;
- }
- else
- {
- /* This one is not ready.. will it be ready before the next
- * scheduled wakeup interval?
- */
-
- remaining = elapsed - work->delay;
- if (remaining < next)
- {
- /* Yes.. Then schedule to wake up when the work is ready */
-
- next = remaining;
- }
-
- /* Then try the next in the list. */
-
- work = (FAR struct work_s *)work->dq.flink;
- }
- }
-
- /* Wait awhile to check the work list. We will wait here until either
- * the time elapses or until we are awakened by a signal.
- */
-
- usleep(next * USEC_PER_TICK);
- irqrestore(flags);
-}
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-/****************************************************************************
- * Name: work_hpthread and work_lpthread
- *
- * Description:
- * These are the main worker threads that performs actions placed on the
- * work lists. One thread also performs periodic garbage collection (that
- * is performed by the idle thread if CONFIG_SCHED_WORKQUEUE is not defined).
- *
- * Input parameters:
- * argc, argv (not used)
- *
- * Returned Value:
- * Does not return
- *
- ****************************************************************************/
-
-int work_hpthread(int argc, char *argv[])
-{
- /* Loop forever */
-
- for (;;)
- {
- /* First, perform garbage collection. This cleans-up memory de-allocations
- * that were queued because they could not be freed in that execution
- * context (for example, if the memory was freed from an interrupt handler).
- * NOTE: If the work thread is disabled, this clean-up is performed by
- * the IDLE thread (at a very, very low priority).
- */
-
-#ifndef CONFIG_SCHED_LPWORK
- sched_garbagecollection();
-#endif
-
- /* Then process queued work. We need to keep interrupts disabled while
- * we process items in the work list.
- */
-
- work_process(&g_work[HPWORK]);
- }
-
- return OK; /* To keep some compilers happy */
-}
-
-#ifdef CONFIG_SCHED_LPWORK
-int work_lpthread(int argc, char *argv[])
-{
- /* Loop forever */
-
- for (;;)
- {
- /* First, perform garbage collection. This cleans-up memory de-allocations
- * that were queued because they could not be freed in that execution
- * context (for example, if the memory was freed from an interrupt handler).
- * NOTE: If the work thread is disabled, this clean-up is performed by
- * the IDLE thread (at a very, very low priority).
- */
-
- sched_garbagecollection();
-
- /* Then process queued work. We need to keep interrupts disabled while
- * we process items in the work list.
- */
-
- work_process(&g_work[LPWORK]);
- }
-
- return OK; /* To keep some compilers happy */
-}
-
-#endif /* CONFIG_SCHED_LPWORK */
-
-#endif /* CONFIG_SCHED_WORKQUEUE */
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