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/*
* Copyright (c) 2016 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief Message queues.
*/
#include <kernel.h>
#include <kernel_structs.h>
#include <debug/object_tracing_common.h>
#include <toolchain.h>
#include <sections.h>
#include <string.h>
#include <wait_q.h>
#include <misc/dlist.h>
#include <init.h>
extern struct k_msgq _k_msgq_list_start[];
extern struct k_msgq _k_msgq_list_end[];
struct k_msgq *_trace_list_k_msgq;
#ifdef CONFIG_OBJECT_TRACING
/*
* Complete initialization of statically defined message queues.
*/
static int init_msgq_module(struct device *dev)
{
ARG_UNUSED(dev);
struct k_msgq *msgq;
for (msgq = _k_msgq_list_start; msgq < _k_msgq_list_end; msgq++) {
SYS_TRACING_OBJ_INIT(k_msgq, msgq);
}
return 0;
}
SYS_INIT(init_msgq_module, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
#endif /* CONFIG_OBJECT_TRACING */
void k_msgq_init(struct k_msgq *q, char *buffer,
size_t msg_size, uint32_t max_msgs)
{
q->msg_size = msg_size;
q->max_msgs = max_msgs;
q->buffer_start = buffer;
q->buffer_end = buffer + (max_msgs * msg_size);
q->read_ptr = buffer;
q->write_ptr = buffer;
q->used_msgs = 0;
sys_dlist_init(&q->wait_q);
SYS_TRACING_OBJ_INIT(k_msgq, q);
}
int k_msgq_put(struct k_msgq *q, void *data, int32_t timeout)
{
__ASSERT(!_is_in_isr() || timeout == K_NO_WAIT, "");
unsigned int key = irq_lock();
struct k_thread *pending_thread;
int result;
if (q->used_msgs < q->max_msgs) {
/* message queue isn't full */
pending_thread = _unpend_first_thread(&q->wait_q);
if (pending_thread) {
/* give message to waiting thread */
memcpy(pending_thread->base.swap_data, data,
q->msg_size);
/* wake up waiting thread */
_set_thread_return_value(pending_thread, 0);
_abort_thread_timeout(pending_thread);
_ready_thread(pending_thread);
if (!_is_in_isr() && _must_switch_threads()) {
_Swap(key);
return 0;
}
} else {
/* put message in queue */
memcpy(q->write_ptr, data, q->msg_size);
q->write_ptr += q->msg_size;
if (q->write_ptr == q->buffer_end) {
q->write_ptr = q->buffer_start;
}
q->used_msgs++;
}
result = 0;
} else if (timeout == K_NO_WAIT) {
/* don't wait for message space to become available */
result = -ENOMSG;
} else {
/* wait for put message success, failure, or timeout */
_pend_current_thread(&q->wait_q, timeout);
_current->base.swap_data = data;
return _Swap(key);
}
irq_unlock(key);
return result;
}
int k_msgq_get(struct k_msgq *q, void *data, int32_t timeout)
{
__ASSERT(!_is_in_isr() || timeout == K_NO_WAIT, "");
unsigned int key = irq_lock();
struct k_thread *pending_thread;
int result;
if (q->used_msgs > 0) {
/* take first available message from queue */
memcpy(data, q->read_ptr, q->msg_size);
q->read_ptr += q->msg_size;
if (q->read_ptr == q->buffer_end) {
q->read_ptr = q->buffer_start;
}
q->used_msgs--;
/* handle first thread waiting to write (if any) */
pending_thread = _unpend_first_thread(&q->wait_q);
if (pending_thread) {
/* add thread's message to queue */
memcpy(q->write_ptr, pending_thread->base.swap_data,
q->msg_size);
q->write_ptr += q->msg_size;
if (q->write_ptr == q->buffer_end) {
q->write_ptr = q->buffer_start;
}
q->used_msgs++;
/* wake up waiting thread */
_set_thread_return_value(pending_thread, 0);
_abort_thread_timeout(pending_thread);
_ready_thread(pending_thread);
if (!_is_in_isr() && _must_switch_threads()) {
_Swap(key);
return 0;
}
}
result = 0;
} else if (timeout == K_NO_WAIT) {
/* don't wait for a message to become available */
result = -ENOMSG;
} else {
/* wait for get message success or timeout */
_pend_current_thread(&q->wait_q, timeout);
_current->base.swap_data = data;
return _Swap(key);
}
irq_unlock(key);
return result;
}
void k_msgq_purge(struct k_msgq *q)
{
unsigned int key = irq_lock();
struct k_thread *pending_thread;
/* wake up any threads that are waiting to write */
while ((pending_thread = _unpend_first_thread(&q->wait_q)) != NULL) {
_set_thread_return_value(pending_thread, -ENOMSG);
_abort_thread_timeout(pending_thread);
_ready_thread(pending_thread);
}
q->used_msgs = 0;
q->read_ptr = q->write_ptr;
_reschedule_threads(key);
}
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