152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/*
|
|
* Copyright (c) 1997-2014 Wind River Systems, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
*
|
|
* @brief Microkernel FIFO header file.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* @brief Microkernel FIFOs
|
|
* @defgroup microkernel_fifo Microkernel FIFOs
|
|
* @ingroup microkernel_services
|
|
* @{
|
|
*/
|
|
|
|
#ifndef FIFO_H
|
|
#define FIFO_H
|
|
|
|
#include <sections.h>
|
|
|
|
/* externs */
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* @cond internal
|
|
*/
|
|
extern int _task_fifo_ioctl(kfifo_t queue, int op);
|
|
|
|
/**
|
|
* @brief Initializer for microkernel FIFO
|
|
*/
|
|
#define __K_FIFO_DEFAULT(depth, width, buffer) \
|
|
{ \
|
|
.Nelms = depth,\
|
|
.element_size = width,\
|
|
.base = buffer,\
|
|
.end_point = (buffer + (depth * width)),\
|
|
.enqueue_point = buffer,\
|
|
.dequeue_point = buffer,\
|
|
.waiters = NULL,\
|
|
.num_used = 0,\
|
|
.high_watermark = 0,\
|
|
.count = 0,\
|
|
}
|
|
|
|
/**
|
|
* @endcond
|
|
*/
|
|
|
|
/**
|
|
* @brief FIFO enqueue request
|
|
*
|
|
* This routine adds an item to the FIFO queue. If the FIFO is currently full
|
|
* then the routine either waits until space becomes available, or until the
|
|
* specified time limit is reached.
|
|
*
|
|
* @param queue FIFO queue.
|
|
* @param data Pointer to data to add to queue.
|
|
* @param timeout Affects the action taken should the FIFO be full. If
|
|
* TICKS_NONE, then return immediately. If TICKS_UNLIMITED, then wait as long
|
|
* as necessary. Otherwise wait up to the specified number of ticks before
|
|
* timing out.
|
|
*
|
|
* @retval RC_OK Successfully added item to FIFO
|
|
* @retval RC_TIME Timed out while waiting to add item to FIFO
|
|
* @retval RC_FAIL Failed to immediately add item to FIFO when
|
|
* @a timeout = TICKS_NONE
|
|
*/
|
|
extern int task_fifo_put(kfifo_t queue, void *data, int32_t timeout);
|
|
|
|
/**
|
|
* @brief FIFO dequeue request
|
|
*
|
|
* This routine fetches the oldest item from the FIFO queue. If the FIFO is
|
|
* currently empty then the routine either waits until an item is added to
|
|
* the FIFO before fetching it, or until the specified time limit is reached.
|
|
*
|
|
* @param queue FIFO queue.
|
|
* @param data Pointer to storage location of the FIFO entry.
|
|
* @param timeout Affects the action taken should the FIFO be empty. If
|
|
* TICKS_NONE, then return immediately. If TICKS_UNLIMITED, then wait as long
|
|
* as necessary. Otherwise wait up to the specified number of ticks before
|
|
* timing out.
|
|
*
|
|
* @retval RC_OK Successfully fetched item from FIFO
|
|
* @retval RC_TIME Timed out while waiting to fetch item from FIFO
|
|
* @retval RC_FAIL Failed to immediately fetch item from FIFO when
|
|
* @a timeout = TICKS_NONE
|
|
*/
|
|
extern int task_fifo_get(kfifo_t queue, void *data, int32_t timeout);
|
|
|
|
/**
|
|
* @brief Queries the number of FIFO entries.
|
|
*
|
|
* @param q FIFO queue.
|
|
*
|
|
* @return # of FIFO entries on query.
|
|
*/
|
|
#define task_fifo_size_get(q) _task_fifo_ioctl(q, 0)
|
|
|
|
/**
|
|
* @brief Purge the FIFO of all its entries.
|
|
*
|
|
* @return RC_OK on purge.
|
|
*/
|
|
#define task_fifo_purge(q) _task_fifo_ioctl(q, 1)
|
|
|
|
|
|
/**
|
|
* @brief Define a private microkernel FIFO
|
|
*
|
|
* This declares and initializes a private FIFO. The new FIFO
|
|
* can be passed to the microkernel FIFO functions.
|
|
*
|
|
* @param name Name of the FIFO
|
|
* @param depth Depth of the FIFO
|
|
* @param width Width of the FIFO
|
|
*/
|
|
#define DEFINE_FIFO(name, depth, width) \
|
|
static char __noinit __##name_buffer[(depth * width)]; \
|
|
struct _k_fifo_struct _k_fifo_obj_##name = \
|
|
__K_FIFO_DEFAULT(depth, width, __##name_buffer); \
|
|
const kfifo_t name = (kfifo_t)&_k_fifo_obj_##name;
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* FIFO_H */
|