79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
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/*
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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 <toolchain.h>
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#include <sections.h>
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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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{
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const struct k_work my_work_item = { NULL, _alert_deliver, { 1 } };
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alert->handler = handler;
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alert->send_count = ATOMIC_INIT(0);
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alert->work_item = my_work_item;
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k_sem_init(&alert->sem, 0, 1);
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SYS_TRACING_OBJ_INIT(micro_event, 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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