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- /****************************************************************************
- * sched/wqueue/work_signal.c
- *
- * Copyright (C) 2014, 2016-2018 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 <signal.h>
- #include <errno.h>
- #include <nuttx/wqueue.h>
- #include <nuttx/signal.h>
- #include "wqueue/wqueue.h"
- #ifdef CONFIG_SCHED_WORKQUEUE
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: work_signal
- *
- * Description:
- * Signal the worker thread to process the work queue now. This function
- * is used internally by the work logic but could also be used by the
- * user to force an immediate re-assessment of pending work.
- *
- * Input Parameters:
- * qid - The work queue ID
- *
- * Returned Value:
- * Zero (OK) on success, a negated errno value on failure
- *
- ****************************************************************************/
- int work_signal(int qid)
- {
- FAR struct kwork_wqueue_s *work;
- int threads;
- int i;
- /* Get the process ID of the worker thread */
- #ifdef CONFIG_SCHED_HPWORK
- if (qid == HPWORK)
- {
- work = (FAR struct kwork_wqueue_s *)&g_hpwork;
- threads = CONFIG_SCHED_HPNTHREADS;
- }
- else
- #endif
- #ifdef CONFIG_SCHED_LPWORK
- if (qid == LPWORK)
- {
- work = (FAR struct kwork_wqueue_s *)&g_lpwork;
- threads = CONFIG_SCHED_LPNTHREADS;
- }
- else
- #endif
- {
- return -EINVAL;
- }
- /* Find an IDLE worker thread */
- for (i = 0; i < threads; i++)
- {
- /* Is this worker thread busy? */
- if (!work->worker[i].busy)
- {
- /* No.. select this thread */
- break;
- }
- }
- /* If all of the IDLE threads are busy, then just return successfully */
- if (i >= threads)
- {
- return OK;
- }
- /* Otherwise, signal the first IDLE thread found */
- return nxsig_kill(work->worker[i].pid, SIGWORK);
- }
- #endif /* CONFIG_SCHED_WORKQUEUE */
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