171 lines
4.9 KiB
C
171 lines
4.9 KiB
C
/****************************************************************************
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* sched/wqueue/work_lpthread.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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).
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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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int wndx = 0;
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#if CONFIG_SCHED_LPNTHREADS > 1
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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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/* 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) signal is
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* triggered, or delayed work expires.
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*/
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work_process((FAR struct kwork_wqueue_s *)&g_lpwork, wndx);
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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_start_lowpri
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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_start_lowpri(void)
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{
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pid_t pid;
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int wndx;
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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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sinfo("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 = kthread_create(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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serr("ERROR: kthread_create %d failed: %d\n", wndx, (int)pid);
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sched_unlock();
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return (int)pid;
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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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