332 lines
10 KiB
C
332 lines
10 KiB
C
/****************************************************************************
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* libc/wqueue/work_thread.c
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*
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* Copyright (C) 2009-2013 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 in 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 <stdint.h>
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#include <unistd.h>
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#include <queue.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/clock.h>
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#include <nuttx/kmalloc.h>
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#ifdef CONFIG_SCHED_WORKQUEUE
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/* The state of each work queue. */
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#ifdef CONFIG_NUTTX_KERNEL
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/* Play some games in the kernel mode build to assure that different
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* naming is used for the global work queue data structures. This may
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* not be necessary but it safer.
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*
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* In this case g_work is #define'd to be either g_kernelwork or
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* g_usrwork in include/nuttx/wqueue.h
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*/
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# ifdef __KERNEL__
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struct wqueue_s g_kernelwork[NWORKERS];
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# else
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struct wqueue_s g_usrwork[NWORKERS];
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# endif
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#else /* CONFIG_NUTTX_KERNEL */
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struct wqueue_s g_work[NWORKERS];
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#endif /* CONFIG_NUTTX_KERNEL */
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: work_process
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*
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* Description:
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* This is the logic that performs actions placed on any work list.
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*
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* Input parameters:
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* wqueue - Describes the work queue to be processed
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void work_process(FAR struct wqueue_s *wqueue)
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{
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volatile FAR struct work_s *work;
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worker_t worker;
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irqstate_t flags;
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FAR void *arg;
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uint32_t elapsed;
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uint32_t remaining;
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uint32_t next;
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/* Then process queued work. We need to keep interrupts disabled while
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* we process items in the work list.
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*/
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next = CONFIG_SCHED_WORKPERIOD / USEC_PER_TICK;
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flags = irqsave();
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work = (FAR struct work_s *)wqueue->q.head;
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while (work)
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{
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/* Is this work ready? It is ready if there is no delay or if
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* the delay has elapsed. qtime is the time that the work was added
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* to the work queue. It will always be greater than or equal to
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* zero. Therefore a delay of zero will always execute immediately.
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*/
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elapsed = clock_systimer() - work->qtime;
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if (elapsed >= work->delay)
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{
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/* Remove the ready-to-execute work from the list */
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(void)dq_rem((struct dq_entry_s *)work, &wqueue->q);
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/* Extract the work description from the entry (in case the work
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* instance by the re-used after it has been de-queued).
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*/
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worker = work->worker;
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/* Check for a race condition where the work may be nullified
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* before it is removed from the queue.
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*/
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if (worker != NULL)
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{
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/* Extract the work argument (before re-enabling interrupts) */
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arg = work->arg;
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/* Mark the work as no longer being queued */
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work->worker = NULL;
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/* Do the work. Re-enable interrupts while the work is being
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* performed... we don't have any idea how long that will take!
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*/
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irqrestore(flags);
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worker(arg);
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/* Now, unfortunately, since we re-enabled interrupts we don't
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* know the state of the work list and we will have to start
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* back at the head of the list.
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*/
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flags = irqsave();
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work = (FAR struct work_s *)wqueue->q.head;
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}
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else
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{
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/* Cancelled.. Just move to the next work in the list with
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* interrupts still disabled.
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*/
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work = (FAR struct work_s *)work->dq.flink;
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}
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}
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else
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{
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/* This one is not ready.. will it be ready before the next
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* scheduled wakeup interval?
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*/
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remaining = elapsed - work->delay;
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if (remaining < next)
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{
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/* Yes.. Then schedule to wake up when the work is ready */
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next = remaining;
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}
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/* Then try the next in the list. */
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work = (FAR struct work_s *)work->dq.flink;
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}
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}
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/* Wait awhile to check the work list. We will wait here until either
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* the time elapses or until we are awakened by a signal.
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*/
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usleep(next * USEC_PER_TICK);
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irqrestore(flags);
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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: work_hpthread, work_lpthread, and work_usrthread
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*
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* Description:
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* These are the worker threads that performs actions placed on the work
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* lists.
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*
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* work_hpthread and work_lpthread: These are the kernel mode work queues
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* (also build in the flat build). One of these threads also performs
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* periodic garbage collection (that is otherwise performed by the idle
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* thread if CONFIG_SCHED_WORKQUEUE is not defined).
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*
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* These worker threads are started by the OS during normal bringup.
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*
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* work_usrthread: This is a user mode work queue. It must be built into
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* the applicatino blob during the user phase of a kernel build. The
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* user work thread will then automatically be started when the system
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* boots by calling through the pointer found in the header on the user
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* space blob.
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*
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* All of these entrypoints are referenced by OS internally and should not
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* not be accessed by application logic.
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*
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* Input parameters:
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* argc, argv (not used)
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*
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* Returned Value:
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* Does not return
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*
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****************************************************************************/
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#if defined(CONFIG_SCHED_HPWORK)
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int work_hpthread(int argc, char *argv[])
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{
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/* Loop forever */
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for (;;)
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{
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/* First, perform garbage collection. This cleans-up memory de-allocations
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* that were queued because they could not be freed in that execution
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* context (for example, if the memory was freed from an interrupt handler).
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* NOTE: If the work thread is disabled, this clean-up is performed by
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* the IDLE thread (at a very, very low priority).
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*/
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#ifndef CONFIG_SCHED_LPWORK
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sched_garbagecollection();
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#endif
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/* Then process queued work. We need to keep interrupts disabled while
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* we process items in the work list.
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*/
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work_process(&g_work[HPWORK]);
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}
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return OK; /* To keep some compilers happy */
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}
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#ifdef CONFIG_SCHED_LPWORK
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int work_lpthread(int argc, char *argv[])
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{
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/* Loop forever */
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for (;;)
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{
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/* First, perform garbage collection. This cleans-up memory de-allocations
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* that were queued because they could not be freed in that execution
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* context (for example, if the memory was freed from an interrupt handler).
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* NOTE: If the work thread is disabled, this clean-up is performed by
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* the IDLE thread (at a very, very low priority).
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*/
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sched_garbagecollection();
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/* Then process queued work. We need to keep interrupts disabled while
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* we process items in the work list.
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*/
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work_process(&g_work[LPWORK]);
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}
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return OK; /* To keep some compilers happy */
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}
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#endif /* CONFIG_SCHED_LPWORK */
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#endif /* CONFIG_SCHED_HPWORK */
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#if defined(CONFIG_SCHED_USRWORK) && !defined(__KERNEL__)
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int work_usrthread(int argc, char *argv[])
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{
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/* Loop forever */
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for (;;)
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{
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/* Then process queued work. We need to keep interrupts disabled while
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* we process items in the work list.
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*/
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work_process(&g_work[USRWORK]);
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}
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return OK; /* To keep some compilers happy */
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}
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#endif /* CONFIG_SCHED_USRWORK */
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#endif /* CONFIG_SCHED_WORKQUEUE */
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