/*
* Copyright (c) 2016 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief kernel alerts.
*/
#include <kernel.h>
#include <kernel_structs.h>
#include <debug/object_tracing_common.h>
#include <atomic.h>
#include <init.h>
#include <toolchain.h>
#include <linker/sections.h>
#include <syscall_handler.h>
extern struct k_alert _k_alert_list_start[];
extern struct k_alert _k_alert_list_end[];
struct k_alert *_trace_list_k_alert;
#ifdef CONFIG_OBJECT_TRACING
/*
* Complete initialization of statically defined alerts.
*/
static int init_alert_module(struct device *dev)
{
ARG_UNUSED(dev);
struct k_alert *alert;
for (alert = _k_alert_list_start; alert < _k_alert_list_end; alert++) {
SYS_TRACING_OBJ_INIT(k_alert, alert);
}
return 0;
}
SYS_INIT(init_alert_module, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
#endif /* CONFIG_OBJECT_TRACING */
void _alert_deliver(struct k_work *work)
{
struct k_alert *alert = CONTAINER_OF(work, struct k_alert, work_item);
while (1) {
if ((alert->handler)(alert) == 0) {
/* do nothing -- handler has processed the alert */
} else {
/* pend the alert */
k_sem_give(&alert->sem);
}
if (atomic_dec(&alert->send_count) == 1) {
/* have finished delivering alerts */
break;
}
}
}
void k_alert_init(struct k_alert *alert, k_alert_handler_t handler,
unsigned int max_num_pending_alerts)
{
alert->handler = handler;
alert->send_count = ATOMIC_INIT(0);
alert->work_item = (struct k_work)_K_WORK_INITIALIZER(_alert_deliver);
k_sem_init(&alert->sem, 0, max_num_pending_alerts);
SYS_TRACING_OBJ_INIT(k_alert, alert);
_k_object_init(alert);
}
void _impl_k_alert_send(struct k_alert *alert)
{
if (alert->handler == K_ALERT_IGNORE) {
/* ignore the alert */
} else if (alert->handler == K_ALERT_DEFAULT) {
/* pend the alert */
k_sem_give(&alert->sem);
} else {
/* deliver the alert */
if (atomic_inc(&alert->send_count) == 0) {
/* add alert's work item to system work queue */
k_work_submit_to_queue(&k_sys_work_q,
&alert->work_item);
}
}
}
#ifdef CONFIG_USERSPACE
_SYSCALL_HANDLER1_SIMPLE_VOID(k_alert_send, K_OBJ_ALERT, struct k_alert *);
#endif
int _impl_k_alert_recv(struct k_alert *alert, s32_t timeout)
{
return k_sem_take(&alert->sem, timeout);
}
#ifdef CONFIG_USERSPACE
_SYSCALL_HANDLER(k_alert_recv, alert, timeout)
{
_SYSCALL_OBJ(alert, K_OBJ_ALERT);
return _impl_k_alert_recv((struct k_alert *)alert, timeout);
}
#endif