220 lines
7.0 KiB
C
220 lines
7.0 KiB
C
/****************************************************************************
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* sched/wqueue/work_hpthread.c
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*
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* Copyright (C) 2009-2014, 2018 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_HPWORK
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* The state of the kernel mode, high priority work queue(s). */
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struct hp_wqueue_s g_hpwork;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: work_hpthread
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*
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* Description:
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* These are the worker threads that performs the actions placed on the high
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* priority work queue.
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*
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* These, along with the lower priority worker thread(s) are the kernel
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* mode work queues (also build in the flat build). One of these threads
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* also performs periodic garbage collection (that would otherwise be
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* performed by the idle thread if CONFIG_SCHED_WORKQUEUE is not defined).
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* That will be the higher priority worker thread only if a lower priority
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* worker thread 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_hpthread(int argc, char *argv[])
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{
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#if CONFIG_SCHED_HPNTHREADS > 1
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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_hpwork */
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for (wndx = 0, i = 0; i < CONFIG_SCHED_HPNTHREADS; i++)
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{
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if (g_hpwork.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_HPNTHREADS);
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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_HPNTHREADS > 1
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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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work_process((FAR struct kwork_wqueue_s *)&g_hpwork, wndx);
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}
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else
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#endif
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{
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#ifndef CONFIG_SCHED_LPWORK
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/* First, perform garbage collection. This cleans-up memory
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* de-allocations that were queued because they could not be freed in
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* that execution context (for example, if the memory was freed from
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* an interrupt handler).
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*
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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). If the low-priority
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* work thread is enabled, then the garbage collection is done on that
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* thread instead.
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*/
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sched_garbage_collection();
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#endif
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/* Then process queued work. work_process will not return until: (1)
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* 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_hpwork, 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_hpstart
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*
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* Description:
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* Start the high-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_hpstart(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_hpwork.
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*/
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sched_lock();
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/* Start the high-priority, kernel mode worker thread(s) */
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sinfo("Starting high-priority kernel worker thread(s)\n");
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for (wndx = 0; wndx < CONFIG_SCHED_HPNTHREADS; wndx++)
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{
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pid = kthread_create(HPWORKNAME, CONFIG_SCHED_HPWORKPRIORITY,
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CONFIG_SCHED_HPWORKSTACKSIZE,
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(main_t)work_hpthread,
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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_hpwork.worker[wndx].pid = pid;
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g_hpwork.worker[wndx].busy = true;
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}
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sched_unlock();
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return g_hpwork.worker[0].pid;
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}
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#endif /* CONFIG_SCHED_HPWORK */
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