229 lines
7.3 KiB
C
229 lines
7.3 KiB
C
/****************************************************************************
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* sched/wqueue/work_lpthread.c
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*
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* Copyright (C) 2009-2014 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 <unistd.h>
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#include <sched.h>
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#include <string.h>
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#include <errno.h>
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#include <queue.h>
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#include <debug.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/kthread.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/clock.h>
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#include "wqueue/wqueue.h"
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#ifdef CONFIG_SCHED_LPWORK
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* The state of the kernel mode, low priority work queue(s). */
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struct lp_wqueue_s g_lpwork;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: work_lpthread
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*
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* Description:
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* These are the worker thread(s) that performs the actions placed on the
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* low priority work queue.
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*
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* These, along with the higher priority worker thread are the kernel mode
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* work queues (also build in the flat build). One of these threads also
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* performs periodic garbage collection (that would otherwise be performed
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* by the idle thread if CONFIG_SCHED_WORKQUEUE is not defined). That will
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* be the lower priority worker thread if it is available.
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*
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* All kernel mode worker threads are started by the OS during normal
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* bring up. This entry point is referenced by OS internally and should
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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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static int work_lpthread(int argc, char *argv[])
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{
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#if CONFIG_SCHED_LPNTHREADS > 0
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int wndx;
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pid_t me = getpid();
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int i;
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/* Find out thread index by search the workers in g_lpwork */
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for (wndx = 0, i = 0; i < CONFIG_SCHED_LPNTHREADS; i++)
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{
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if (g_lpwork.worker[i].pid == me)
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{
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wndx = i;
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break;
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}
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}
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DEBUGASSERT(i < CONFIG_SCHED_LPNTHREADS);
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#endif
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/* Loop forever */
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for (; ; )
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{
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#if CONFIG_SCHED_LPNTHREADS > 0
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/* Thread 0 is special. Only thread 0 performs period garbage collection */
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if (wndx > 0)
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{
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/* The other threads will perform work, waiting indefinitely until
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* signalled for the next work availability.
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*
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* The special value of zero for the poll period instructs work_process
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* to wait indefinitely until a signal is received.
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*/
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work_process((FAR struct kwork_wqueue_s *)&g_lpwork, 0, wndx);
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}
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else
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#endif
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{
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/* 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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* In the event of multiple low priority threads, on index == 0 will do
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* the garbage collection.
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*/
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sched_garbage_collection();
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/* Then process queued work. work_process will not return until:
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* (1) there is no further work in the work queue, and (2) the polling
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* period provided by g_lpwork.delay expires.
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*/
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work_process((FAR struct kwork_wqueue_s *)&g_lpwork, g_lpwork.delay, 0);
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}
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}
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return OK; /* To keep some compilers happy */
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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_lpstart
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*
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* Description:
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* Start the low-priority, kernel-mode worker thread(s)
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*
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* Input parameters:
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* None
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*
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* Returned Value:
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* The task ID of the worker thread is returned on success. A negated
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* errno value is returned on failure.
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*
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****************************************************************************/
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int work_lpstart(void)
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{
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pid_t pid;
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int wndx;
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/* Initialize work queue data structures */
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memset(&g_lpwork, 0, sizeof(struct kwork_wqueue_s));
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g_lpwork.delay = CONFIG_SCHED_LPWORKPERIOD / USEC_PER_TICK;
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dq_init(&g_lpwork.q);
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/* Don't permit any of the threads to run until we have fully initialized
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* g_lpwork.
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*/
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sched_lock();
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/* Start the low-priority, kernel mode worker thread(s) */
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svdbg("Starting low-priority kernel worker thread(s)\n");
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for (wndx = 0; wndx < CONFIG_SCHED_LPNTHREADS; wndx++)
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{
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pid = kernel_thread(LPWORKNAME, CONFIG_SCHED_LPWORKPRIORITY,
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CONFIG_SCHED_LPWORKSTACKSIZE,
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(main_t)work_lpthread,
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(FAR char * const *)NULL);
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DEBUGASSERT(pid > 0);
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if (pid < 0)
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{
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int errcode = errno;
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DEBUGASSERT(errcode > 0);
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slldbg("kernel_thread %d failed: %d\n", wndx, errcode);
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sched_unlock();
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return -errcode;
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}
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g_lpwork.worker[wndx].pid = pid;
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g_lpwork.worker[wndx].busy = true;
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}
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sched_unlock();
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return g_lpwork.worker[0].pid;
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}
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#endif /* CONFIG_SCHED_LPWORK */
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