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https://github.com/zephyrproject-rtos/zephyr
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3cd702010f
k_alert_init() needs to set the "flags" field of its associated work item to zero, indicating that the work item has not yet been submitted to the system workqueue. Using the standard work item initializer macro ensures this is done correctly. Change-Id: I0001a5920f20fb1d8dc182191e6a549c5bf89be5 Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/*
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* Copyright (c) 2016 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief kernel alerts.
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*/
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#include <kernel.h>
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#include <nano_private.h>
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#include <misc/debug/object_tracing_common.h>
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#include <atomic.h>
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#include <init.h>
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#include <toolchain.h>
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#include <sections.h>
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extern struct k_alert _k_alert_list_start[];
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extern struct k_alert _k_alert_list_end[];
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struct k_alert *_trace_list_k_alert;
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#ifdef CONFIG_DEBUG_TRACING_KERNEL_OBJECTS
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/*
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* Complete initialization of statically defined alerts.
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*/
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static int init_alert_module(struct device *dev)
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{
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ARG_UNUSED(dev);
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struct k_alert *alert;
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for (alert = _k_alert_list_start; alert < _k_alert_list_end; alert++) {
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SYS_TRACING_OBJ_INIT(k_alert, alert);
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}
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return 0;
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}
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SYS_INIT(init_alert_module, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
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#endif /* CONFIG_DEBUG_TRACING_KERNEL_OBJECTS */
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void _alert_deliver(struct k_work *work)
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{
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struct k_alert *alert = CONTAINER_OF(work, struct k_alert, work_item);
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while (1) {
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if ((alert->handler)(alert) == 0) {
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/* do nothing -- handler has processed the alert */
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} else {
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/* pend the alert */
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k_sem_give(&alert->sem);
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}
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if (atomic_dec(&alert->send_count) == 1) {
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/* have finished delivering alerts */
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break;
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}
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}
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}
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void k_alert_init(struct k_alert *alert, k_alert_handler_t handler,
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unsigned int max_num_pending_alerts)
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{
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alert->handler = handler;
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alert->send_count = ATOMIC_INIT(0);
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alert->work_item = (struct k_work)K_WORK_INITIALIZER(_alert_deliver);
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k_sem_init(&alert->sem, 0, max_num_pending_alerts);
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SYS_TRACING_OBJ_INIT(k_alert, alert);
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}
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void k_alert_send(struct k_alert *alert)
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{
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if (alert->handler == K_ALERT_IGNORE) {
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/* ignore the alert */
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} else if (alert->handler == K_ALERT_DEFAULT) {
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/* pend the alert */
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k_sem_give(&alert->sem);
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} else {
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/* deliver the alert */
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if (atomic_inc(&alert->send_count) == 0) {
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/* add alert's work item to system work queue */
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k_work_submit_to_queue(&k_sys_work_q,
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&alert->work_item);
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}
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}
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}
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int k_alert_recv(struct k_alert *alert, int32_t timeout)
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{
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return k_sem_take(&alert->sem, timeout);
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}
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